OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

NOTE: THIS SAMPLE REPORT IS MEANT TO SHOW YOU WHAT OUR REPORTS GENERALLY LOOK LIKE. EACH REPORT WILL BE CATERED SPECIFICALLY TO YOUR CASE. NAMES AND LOCATIONS HAVE BEEN CHANGED TO PRESERVE CONFIDENTIALITY.

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FORENSIC WEATHER INVESTIGATION OF THE WEATHER CONDITIONS, WIND GUSTS AND HAIL OCCURRENCE BETWEEN MAY 1, 2019 AND JUNE 27, 2019 AT 123 NORTH KENILWORTH AVENUE IN OAK PARK, ILLINOIS

December 18, 2020

CASE NAME: “Oak Park Auto Plaza” CLAIM NUMBER: xxxxxxxx REPORTED DATE OF LOSS: June 1, 2019 PREPARED FOR: Mr. Bob Berger, Esq. COMPANY: The Insurance Group

This written report and all of the tables, graphs, findings, data and opinions contained in it has been prepared for use with this specific case only. Use of any of this information for any other matter, claim or case other than what is indicated above, including for use in expert disclosures in other cases, is strictly prohibited.

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

ASSIGNMENT:

This case was assigned to me by The Insurance Group. I was asked to perform an in-depth weather analysis and forensic weather investigation at 123 North Kenilworth Avenue in Oak Park, Illinois in order to determine what the weather conditions were between May 1, 2019 and June 27, 2019.

Studies to determine if and when hail occurred at an incident location, the size of the hail that fell, the wind speeds, or if a tornado occurred should only be conducted by a qualified Certified Consulting Meteorologist (CCM) who is an expert in the field, who has the education, training and experience, and who employs the correct methodology and accepted practices normally relied upon by meteorologists in these investigations.

METHODOLOGY:

Forensic Weather Consultants, LLC uses various reliable sources of weather information in order to conduct a reliable weather analysis. In order to accurately determine the weather conditions that existed leading up to and including the time of the incident, a detailed search was performed to find the closest, official weather stations to the incident location. Using the computer program “Google Earth”, weather station locations provided by the National Climatic Data Center (NCDC) were plotted and are indicated by a yellow pushpin. While not all of the weather data can be certified by the NCDC, it is all housed and maintained on websites including ncdc.noaa.gov and raws.wrh.noaa.gov and are the records that meteorologists rely upon during the normal course of business to conduct these investigations.

GENERAL REVIEW OF WEATHER DATA SOURCES

Many different types of weather data are gathered and analyzed as part of our investigations. While some, but not necessarily all, of these weather data sources were utilized for this case, we are providing a list of the different types of stations for informational purposes.

The Automated Surface Observing Systems (ASOS) program is a joint effort of the National Weather Service (NWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD). The ASOS systems serve as the nation's primary surface weather observing network. The ASOS systems compile various weather observations, often more than once per hour, called Local Climatological Data (LCD) that are reviewed, maintained, and stored by NOAA.

Through the National Weather Service (NWS) Cooperative Observer Program (COOP), more than 10,000 volunteers take daily weather observations at National Parks, seashores, mountaintops, and farms as well as in urban and suburban areas. COOP data usually consists of daily maximum and minimum temperatures, snowfall, and 24-hour precipitation totals ending at a specific time, such as 7:00 a.m. in many locations.

The Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) is a network consisting of volunteer weather observers across the United States, Canada and the Bahamas.

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

These volunteers take daily precipitation measurements and report them to a centralized data store online, where this data is heavily utilized by the NWS, meteorologists, emergency managers and city utilities. CoCoRaHS data is particularly useful in situations where storm systems produce sharp precipitation gradients.

One of the most effective tools to detect precipitation is radar. Radar, which stands for RAdio Detection And Ranging, has been utilized to detect precipitation, and especially thunderstorms, since the 1940's. The radar used by the National Weather Service is called the WSR-88D, which stands for Weather Surveillance Radar - 1988 Doppler (the prototype radar was built in 1988). As its name suggests, the WSR-88D is a Doppler radar, meaning it can detect motions toward or away from the radar as well as the location of precipitation areas. There are 155 WSR-88D Doppler radar in the nation, including the U.S. Territory of Guam and the Commonwealth of Puerto Rico, operated by the National Weather Service and the Department of Defense.

The National Weather Service offices around the country issue a multitude of weather alerts, advisories, warnings and bulletins every day and these are also utilized in our investigations.

The incident location was plotted by our office and is indicated by a red pushpin. The following map will help give you an approximate location of the National Weather Service Hourly Surface Weather Observations stations we used in this study and their proximity to the incident location.

The following map will help give you an approximate location of the Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) stations we used in this study and their proximity to the incident location.

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

In order to perform my analysis of the weather conditions that existed, I obtained and reviewed official copies of the following weather records (the distance from the incident location and each weather station is also provided):

a. National Weather Service Hourly Surface Weather Observations/ Local

Climatological Data (LCD) from the Chicago Midway International Airport in

Chicago, Illinois (approximately xxxx miles south-southeast of the incident

location).

b. National Weather Service Hourly Surface Weather Observations/ Local

Climatological Data (LCD) from the O’Hare International Airport in Chicago,

Illinois (approximately xxxx miles northwest of the incident location).

c. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Oak Park 1.0 SW, Illinois (approximately xxxx miles south of the

incident location).

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

d. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Oak Park 1.3 NNE, Illinois (approximately xxxx miles northeast of the

incident location).

e. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Oak Park 1.5 S, Illinois (approximately xxxx miles south-southeast of

the incident location).

f. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Elmwood Park 0.7 ESE, Illinois (approximately xxxx miles north of the

incident location).

g. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Berwyn 0.9 NW, Illinois (approximately xxxx miles south of the

incident location).

h. Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) reports

from Cicero 0.4 W, Illinois (approximately xxxx miles south-southeast of the

incident location).

i. Online Community Collaborative Rain, Hail and Snow Network (CoCoRaHS)

reports for Cook County in Illinois and DuPage County in Illinois.

j. Super-resolution Reflectivity Doppler Radar images from the Chicago, Illinois

radar site that were zoomed in over the incident location.

k. Super-resolution Velocity Doppler Radar images from the Chicago, Illinois

radar site that were zoomed in over the incident location.

l. Differential Reflectivity Doppler Radar images from the Chicago, Illinois

radar site that were zoomed in over the incident location.

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

m. Correlation Coefficient Doppler Radar images from the Chicago, Illinois radar

site that were zoomed in over the incident location.

n. Reflectivity Cross Section Doppler Radar images from the Chicago, Illinois

radar site that were zoomed in over the incident location.

o. Differential Reflectivity Cross Section Doppler Radar images from the

Chicago, Illinois radar site that were zoomed in over the incident location.

p. Probability of Severe Hail Doppler Radar images from the Chicago, Illinois

radar site that were zoomed in over the incident location.

q. Maximum Estimated Hail Size Doppler Radar images from the Chicago,

Illinois radar site that were zoomed in over the incident location.

r. Atmospheric sounding numerical data from Davenport, Iowa on June 1, 2019.

s. Various weather bulletins, advisories and statements that were issued by the

National Weather Service (NWS) in Chicago, Illinois.

t. Forensic Weather Consultants History Database.

u. Forensic Weather Consultants “Hail Impact Report” from

Www.HailRecords.Com

v. CoreLogic Hail Verification Report.

w. Iowa Environmental Mesonet (IEM) Archived Warnings issued by the NWS

in Chicago, Illinois.

x. United States Surface Analysis images from the Weather Prediction Center

(WPC).

y. Storm Events Database from the National Climatic Data Center (NCDC) for

Cook County in Illinois and DuPage County in Illinois.

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The weather data and Climatological records used for this analysis are the official records that Meteorologists rely upon every day during the normal course of business and are either kept in our office or at the National Climatic Data Center. The findings in this report utilize the weather records that were available at the time of data retrieval for this case. Any additional weather records and data that become available at a later date may be incorporated into this report in the future.

Super-resolution Doppler radar images and several other types of weather records were used in this study. Doppler radar images are useful for locating precipitation. As the radar unit sends a pulse of energy into the atmosphere and if any precipitation is intercepted by the energy, part of the energy is scattered back to the radar. These return signals, called “radar echoes”, are assembled to produce radar images. The location of the colored radar echoes indicates where precipitation is falling and the various colors indicate the intensity of the precipitation through the color code key on the right side of the radar image itself. Doppler radar images are received approximately every 6 minutes and can determine if precipitation was falling at the incident location and if so, when it started and stopped.

Doppler radar images were processed by the Chicago, Illinois radar site. These images were zoomed in over the incident location which I manually plotted using a red “dot” on the radar map. Using the program Gibson Ridge Analyst Edition (GRAE), which is widely used by other consulting meteorologists and National Weather Service Offices nationwide, super-resolution base reflectivity data, super-resolution base velocity data, differential reflectivity data, correlation coefficient data, reflectivity cross section data, differential reflectivity cross section data, probability of severe hail data, and maximum estimated hail size data over the incident location was obtained.

It should be noted that the radar image date and time stamps that are given on the Doppler radar images are given in “GMT”, which is Greenwich Mean Time. In order to convert “GMT” to Central Daylight Time (CDT), a subtraction of 5 hours is necessary. Additionally, the hourly surface weather observations / Local Climatological Data are given in “Local Standard Time” which requires a one-hour forward time adjustment to obtain “Central Daylight Time (CDT)”. The only exception to this is that some of the remarks themselves are given in GMT. The findings in this report have incorporated and converted all of these times correctly.

HAIL FORMATION OVERVIEW

Thunderstorms contain significant amounts of energy in the form of updrafts and downdrafts. The vertical wind speeds of the updrafts can reach over 100 Miles Per Hour. As the updraft becomes stronger, the thunderstorm grows taller, allowing water droplets in the updraft to reach altitudes where temperatures are well below freezing. This allows some of the water-droplets to freeze while others will remain in a liquid state event though temperatures are below freezing (these droplets are called super-cooled droplets). Eventually, some of the frozen water-droplets will get into the downdraft, melting slightly as they fall. Some of these frozen water-droplets will be lifted back up into the updraft where they will rapidly rise. During this time, they will freeze on contact with other ice crystals, other super-cooled water droplets, or dust forming even larger droplets. This repeated cycle can occur several times depending on the strength of the

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019 updraft and these processes allow the hail stone to accumulate more layers of ice. This continues until the hailstone becomes too heavy for the updraft to support it. At that time, the hailstone will fall to the earth’s surface.

Hailstones often consist of different layers. These layers are caused by the different rates of accumulation and freezing of supercooled water, as the hailstone forms. When there is a great deal of supercooled liquid in the air through which the hailstone falls, water accumulates faster than it can freeze, so a coat of liquid forms. This becomes a layer of clear ice when it does freeze. When a hailstone falls through air with a smaller amount of liquid, the liquid freezes on contact with the hailstone, forming small air bubbles in the opaque layers. The more supercooled water a hailstone makes contact with, the larger and heavier the stone is likely to become.

Not all hail events, wind gusts and storm damage is reported to the National Weather Service (NWS) and the National Centers for Environmental Information (NCEI). These are the entities that compile these reports. There are number of reasons why storm reports may not be listed. Some include the time of day, if the storm occurred during the overnight hours when most people were sleeping, how populated an area is, if communications were interrupted, if the NWS logged each storm report that was received, or if the general public even knew how to submit such a report. For these reasons and others, just because hail, wind or tornado reports were not listed near the location of an incident does not mean it didn’t occur. In order to determine what the weather conditions were at the incident location, a Certified Consulting Meteorologist should conduct a detailed analysis using the most reliable data sources and industry accepted methodology and practices.

METEOROLOGICAL ANALYSIS FOR MAY 1-16, 2019

Using the numerous weather records and data listed above, I conducted a research study to determine if strong winds or hail occurred at the incident location between May 1-16, 2019. My analysis of radar imagery zoomed over the incident location and various storm reports and hail reports indicated that no hail occurred at the incident location during this time.

METEOROLOGICAL ANALYSIS FOR MAY 17, 2019

On May 17, 2019, a disorganized cluster of thunderstorms moved from west to east and passed over the incident location. The thunderstorms were more intense well west of the incident location. Doppler radar images that were zoomed in over the incident location indicated that some brief moderate to heavy rainfall accompanied these thunderstorms. Differential reflectivity, correlation coefficient and cross section reflectivity images all indicated no hail was present. A severe thunderstorm warning was issued for the area to account for more intense thunderstorm activity to the north and to the south of the incident location. No Local Storm Reports were received in the area, another indication that severe weather did not occur at the incident location.

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Base Reflectivity and Base Velocity Doppler radar images between 12:53 and 1:02 a.m. CDT on May 17, 2019

The following Doppler radar images were processed between 12:53 and 1:02 a.m. CDT and depict super-resolution base reflectivity (left) and super-resolution base velocity (right). These images indicate the strong thunderstorm that affected the incident location. While the thunderstorms were strong at the incident location, Doppler radar velocity images indicated that the highest wind gusts were 40-45 Miles Per Hours (40 knots at the 1,293foot level) and lasted only 9 minutes or so.

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019

METEOROLOGICAL ANALYSIS FOR MAY 17-31, 2019

Using the numerous weather records and data listed above, I conducted a research study to determine if strong winds or hail occurred at the incident location between May 17-31, 2019. My analysis of radar imagery zoomed over the incident location and various storm reports and hail reports indicated that no hail occurred at the incident location during this time.

METEOROLOGICAL ANALYSIS FOR JUNE 1, 2019

The following is a surface analysis map of the contiguous United States at 1:00 p.m. CDT on June 1st, 2019 that was prepared by the Weather Prediction Center (WPC), a division of the National Weather Service. This surface map indicated that a low-pressure system was located over southern Wisconsin. A cold front associated with this area of low pressure was located from northwestern Illinois through Kansas and into Wyoming.

On June 1st, 2019 (reported date of loss), Doppler radar images that were zoomed in over the incident location and nearby surface observations indicated that at 3:25 p.m., a strong to severe thunderstorm was located to the southwest of the incident location. This thunderstorm moved generally east or east-northeast between 3:25 p.m. and 3:44 p.m. This strong to severe thunderstorm remained to the southwest, south, and then southeast of the incident location, and

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OAK PARK AUTO PLAZA – OAK PARK, ILLINOIS – JUNE 1, 2019 did not affect the incident location. While there were some showers and weak thunderstorms that moved over the incident location during the afternoon and evening on June 1st, 2019, these storms did not produce any hail or strong winds at the incident location itself.

Base Reflectivity, Base Velocity, Differential Reflectivity, and Correlation Coefficient Doppler radar images between 3:44-3:58 p.m. CDT on June 1st, 2019

The following Doppler radar images were processed between 3:44-3:58 p.m. CDT and depict super-resolution base reflectivity (top left), super-resolution base velocity (top right), differential reflectivity (bottom left), and correlation coefficient (bottom right). These images indicated that a strong to severe thunderstorm did not affect the incident location during this time frame. While a brief shower and weak thunderstorm did occur at the incident location, this shower and thunderstorm did not produce any hail or strong winds at the incident location.

3:44 p.m. CDT on June 1st, 2019

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3:48 p.m. CDT on June 1st, 2019

3:53 p.m. CDT on June 1st, 2019

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3:58 p.m. CDT on June 1st, 2019

Differential Reflectivity (ZDR) Differential reflectivity (ZDR) is the difference between the horizontal and vertical reflectivity values observed by Doppler radar. ZDR is useful in determining the shape of the hydrometeor and identifying hail compared to a raindrop.

Correlation Coefficient (CC)

Correlation Coefficient (CC) is a measure of how similar the horizontal and vertical pulses are behaving from pulse to pulse. CC is useful for identifying large hail, tornadic debris aloft, rain versus snow, and irregular hydrometeor shapes.

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According to the Radiosonde observations (balloon launch) that were taken from Davenport, Iowa at 7:00 a.m. CDT on June 1st, 2019, the Environmental Freezing Level (0 degrees Celsius Level) was located at approximately 10,628 Feet above the ground, and the -20 Degree Celsius Level was located at approximately 19,967 Feet above the ground.

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Reflectivity Cross Section Doppler radar images between 3:48-3:58 p.m. CDT on June 1st, 2019

The following Doppler radar images were processed between 3:48-3:58 p.m. CDT on June 1st, 2019 and depict reflectivity cross sections. These images were not indicative of any hail occurring at the incident location during this time frame.

3:48 p.m. CDT on June 1st, 2019

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3:53 p.m. CDT on June 1st, 2019

3:58 p.m. CDT on June 1st, 2019

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Differential Reflectivity Cross Section Doppler radar images between 3:48-3:58 p.m. CDT on June 1st, 2019

The following Doppler radar images were processed between 3:48-3:58 p.m. CDT on June 1st, 2019 and depict differential reflectivity cross sections. Differential Reflectivity (ZDR) is applied to polarimetric radar observations as the ratio of the reflectivity observed with transmitted and received signals of horizontal polarization to that observed with signals of vertical polarization. It is commonly represented by the symbol ZDR. The ratio of radar reflectivity measured with two signals of different wavelength is more commonly described as the dual-wavelength ratio. A ZDR Channel on radar extending from the atmosphere to the ground is indicative of large hail falling to the ground. These images did not indicate the presence of a differential reflectivity channel over the incident location.

3:48 p.m. CDT on June 1st, 2019

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3:53 p.m. CDT on June 1st, 2019

3:58 p.m. CDT on June 1st, 2019

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A “Severe Thunderstorm Warning” was in effect from 3:33 p.m. through 4:15 p.m. on June 1st, 2019, however, the strong to severe thunderstorm that prompted the issuance of this warning did not affect the incident location.

NATIONAL WEATHER SERVICE LOCAL STORM REPORTS (LSRs)

After determining if Local Storm Reports were received by the National Weather Service and the National Climatic Data Center on June 1st, 2019, I quality-controlled and plotted these reports using the program Google Earth. The following map depicts the reports that were received within the vicinity of the incident location and the text bulletins themselves can be found after the storm reports map.

At 3:37 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Report” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 337 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0333 PM HAIL BROOKFIELD 41.83N 87.84W 06/01/2019 E0.88 INCH COOK IL PUBLIC

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At 3:40 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following Corrected “Preliminary Local Storm Report” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 340 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0333 PM HAIL BROOKFIELD 41.83N 87.84W 06/01/2019 M0.88 INCH COOK IL TRAINED SPOTTER CORRECTS PREVIOUS HAIL REPORT FROM BROOKFIELD.

At 3:42 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Report” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 342 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0339 PM HAIL BERWYN 41.85N 87.79W 06/01/2019 M0.88 INCH COOK IL PUBLIC RELAYED VIA SOCIAL MEDIA.

At 4:04 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following Corrected “Preliminary Local Storm Report” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT...CORRECTED NATIONAL WEATHER SERVICE CHICAGO IL 404 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0335 PM HAIL BERWYN 41.84N 87.79W 06/01/2019 E1.50 INCH COOK IL PUBLIC CORRECTS PREVIOUS HAIL REPORT FROM BERWYN. RELAYED VIA SOCIAL MEDIA.

At 4:16 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Reports” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 416 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0413 PM HAIL 2 ENE BRIDGEPORT 41.85N 87.62W 06/01/2019 E0.88 INCH COOK IL NWS EMPLOYEE 0403 PM HAIL 1 NE LOGAN SQUARE 41.93N 87.69W 06/01/2019 M0.88 INCH COOK IL TRAINED SPOTTER 0330 PM HAIL BROOKFIELD 41.83N 87.85W 06/01/2019 E0.25 INCH COOK IL PUBLIC

At 4:35 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Reports” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 435 PM CDT SAT JUN 1 2019

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..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0412 PM HAIL 3 SW MIDWAY AIRPORT 41.76N 87.80W 06/01/2019 M0.25 INCH COOK IL CO-OP OBSERVER

At 5:07 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Reports” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 507 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0505 PM HAIL 1 S WESTERN SPRINGS 41.79N 87.90W 06/01/2019 E0.25 INCH COOK IL PUBLIC

At 5:12 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Reports” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 512 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0512 PM HAIL 1 NNE LA GRANGE 41.82N 87.87W 06/01/2019 E0.70 INCH COOK IL PUBLIC PICTURE SHARED VIA TWITTER SHOWED DIME SIZE HAIL IN LA GRANGE.

At 5:22 p.m. on June 1st, 2019, the National Weather Service in Chicago, Illinois issued the following “Preliminary Local Storm Report” which included Cook County in Illinois:

PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE CHICAGO IL 522 PM CDT SAT JUN 1 2019 ..TIME...... EVENT...... CITY LOCATION...... LAT.LON... ..DATE...... MAG...... COUNTY LOCATION..ST.. ...SOURCE...... REMARKS.. 0512 PM HAIL 1 NNE LA GRANGE 41.82N 87.87W 06/01/2019 E0.70 INCH COOK IL TRAINED SPOTTER 0.5 IN HAIL. 0438 PM HAIL ANTIOCH 42.48N 88.10W 06/01/2019 M0.70 INCH LAKE IL TRAINED SPOTTER 0.5 IN HAIL. 0357 PM HAIL 1 E FOREST PARK 41.87N 87.80W 06/01/2019 E1.25 INCH COOK IL PUBLIC PHOTO SHARED VIA SOCIAL MEDIA OF HAIL SLIGHTLY LARGER THAN QUARTER SIZED.

METEOROLOGICAL ANALYSIS FOR JUNE 2-27, 2019

Using the numerous weather records and data listed above, I conducted a research study to determine if strong winds or hail occurred at the incident location between June 2-27, 2019. My analysis of radar imagery zoomed over the incident location and various storm reports and hail reports indicated that no hail occurred at the incident location during this time.

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Hail Size Descriptions

The following is a traditional object-to-size conversion chart for assessment and translation of hail reports. This chart was provided by the (a division of the NWS).

CONCLUSIONS

In conclusion, it is my opinion that:

• My analysis revealed that no large hail or severe winds occurred at the incident location between May 1, 2019 and June 27, 2019. • On May 17, 2019, a cluster of strong thunderstorms passed over the incident location and caused maximum wind gusts between 40-45 Miles Per Hour to occur which lasted only 9 minutes or so. • On June 1, 2019, while there were some showers and weak thunderstorms that moved over the incident location during the afternoon and evening, these storms did not produce any hail or strong winds at the incident location itself.

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CERTIFICATION

I certify that the above information contained in this report is true and accurate to the best of my ability and that all of my opinions, findings, estimations and interpolations expressed in this report were made with accuracy as a professional meteorologist within a reasonable degree of meteorological certainty.

By: ______Certified Consulting Meteorologist

Certified Consulting Meteorologist Awarded by the American Meteorological Society.

______

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