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Storm Environment
August 4th, 2008 Chicago Derecho Tim Halbach – NWS Chicago Ron Przybylinski – NWS St. Louis Advanced Spotter Training-March 14, 2009 Event Overview y Progressive Derecho developed in eastern Iowa/northwest Illinois and caused widespread damage and power outages across northern Illinois and Indiana y Dissipated over West Virginia y Worst damage occurred north of the apex of the bow where multiple mesovorticies developed y Well developed convective system featuring a long lived Book-End Vortex and Rear Inflow Jet y Strong winds persisted well after the leading edge of the derecho • very low RIJ? y 6 tornadoes were confirmed via storm surveys y Griffith, IN: EF2 y Bloomingdale, IL: EF1 (2 Tornadoes) y Bolingbrook, IL: EF1 y Orland Park, IL: EF0 y Boswell, IN: EF0 Storm Environment 250 MB 3pm CDT Surface Map Forecast NAM Bufr Soundings- 21z at ORD Severe Thunderstorm Watches Nested Storm Based Warning Sectorization y Used a nested storm based warning sectorization for this event y 2 Meteorologists issuing severe warnings y 1 Meteorologist issuing tornado warnings Radar Analysis of the 5 Main Rotations The 5 Rotations Mesovort #1 y Developed along the Ogle/Carroll County line y Strengthened near Mount Morris • straight-line wind damage w/no tornado y Grain bin blown down, phone tower knocked over, building leveled. y Rotation lasted for about 1 hour and traveled about 60 miles from Carroll County into northern De Kalb county The 5 Rotations Mesovort #1 The 5 Rotations Mesovort #1 The 5 Rotations Mesovort #1 y Strongest rotation near Mount Morris The 5 Rotations Mesovort #1 y 108.8 knots sampled at 5130ft Above Ground Level The 5 Rotations Mesovort #1 -Damage Pictures from Ogle County The 5 Rotations Mesovort #2 y Developed further to the south across north central De Kalb county. -
The Initiation and Evolution of a Mini-Bow Echo Occurring Behind a Prefrontal Squall Line
THE INITIATION AND EVOLUTION OF A MINI-BOW ECHO OCCURRING BEHIND A PREFRONTAL SQUALL LINE Alan E. Gerard NOAA/National Weather Service Forecast Office Jackson, Mississippi Corey M. Mead NOAA/National Weather Service Forecast Office OmahalValley, Nebraska Abstract tern, as well as shear zones and circulations along the leading edge of the convection, were observed by the Early on 13 April 1996, a mini-bow echo moved Jackson, Mississippi (KJAN) WSR-88D. through parts of south central Mississippi. This bow echo produced one report of severe weather, namely $10K in 2. Synoptic Environment wind damage near the town of Bassfield in Jefferson Davis county. The evolution of this bow echo was some During the early evening hours of 12 April 1996, syn what unusual, in that the storm developed within the optic features and parameters came together for an active southern part of the enhanced stratiform rain region of a severe weather event over the western Gulf Coast region well developed prefrontal squall line. This paper will (Fig. 2). At 0000 UTC 13 April 1996, an upper-level short examine the development of this small bow echo, begin wave trough had become negatively-tilted over north ning with the synoptic and mesoscale environments. This Texas as a 30 m s'! 500 mb wind maximum lifted out ofthe will be followed by the storm evolution as observed by the base of the trough and into the mid-Mississippi valley WSR-88D Doppler radar in Jackson, Mississippi. region. A 300 mb polar jet streak in excess of 50 m s'! was located downstream from the trough axis from eastern 1. -
An Evaluation of High-Resolution Modeling and Statistical
AN EVALUATION OF HIGH-RESOLUTION MODELING AND STATISTICAL FORECAST TECHNIQUES OVER COMPLEX TERRAIN by Kenneth Alan Hart A dissertation submitted to the faculty of The University of Utah in partial fulfillment of the requirements for the degree of Doctor of Philosophy Department of Meteorology The University of Utah August 2004 Copyright © Kenneth Alan Hart 2004 All Rights Reserved ABSTRACT The accuracy of weather forecasts produced during the 2002 Olympic and Paralympic Games (23 Jan – 25 Mar 2002) by a multiply nested version of the PSU- NCAR Mesoscale Model (MM5) and associated model output statistics (MOS) system is evaluated using observations collected by the MesoWest cooperative network. Using traditional verification measures, the accuracy of MM5 wind and precipitation forecasts improved as model grid spacing decreased from 12 to 4 km. In contrast, temperature forecasts did not improve with decreasing model grid spacing due to the inability of the MM5 to properly simulate the evolution of persistent or nocturnal cold pools over lowland regions. Improved parameterization of the stable boundary layer processes may enable model skill to improve as grid spacing is decreased from 12 to 4 km. The need to improve model physics was also illustrated by the fact that MM5 MOS temperature, relative humidity, wind speed, and wind direction forecasts were considerably more accurate than those produced by either the 12- or 4-km MM5. These results suggest that, contrary to studies in regions of broader topographic features, decreasing model grid spacing (< 10 km) does improve model skill over the finescale topography of the Intermountain West. These improvements may be valuable for a variety of environmental applications including fire weather forecasting, air quality prediction, and transport and dispersion modeling. -
Synoptic, Mesoscale and Radar Aspects of the Northeast Kansas Supercell of September 21, 1993
■© \r<J> QC 995 • U61 no.109 F c.2 OAA TECHNICAL MEMORANDUM NWS CR-109 ii SYNOPTIC, MESOSCALE AND RADAR ASPECTS OF THE NORTHEAST KANSAS SUPERCELL OF SEPTEMBER 21, 1993 Kenneth M. Labas National Weather Service Forecast Office (Chicago) Romeoville, Illinois Brian P. Walawender National Weather Service Forecast Office Topeka, Kansas October 1995 U.S DEPARTMENT OF / National Oceanic and / National Weather Commerce / Atmospheric Administration/ Service RECEIVED hdV 1 6 19S5 Director, Office of Meteorology NOAA TECHNICAL MEMORANDA National Weather Service, Central Region Subseries The National Weather Service Central Region (CR) subseries provides an informal medium for the documentation and quick dissemina tion of results not appropriate, or not yet ready, for formal publication. The series is used to report on work in progress, to describe technical procedures and practices, or to relate progress to a limited audience. These Technical Memoranda report on investigations devoted primarily to regional and local problems of interest mainly to regional personnel, and hence will not be widely distributed. Papers 1 through 15 are in the former series, ESSA Technical Memoranda, Central Region Technical Memoranda (CRTM); Papers 16 throigh 36 are in the former series, ESSA Technical Memoranda, Weather Bureau Technical Memoranda (WBTM). Beginning with Paper 37, the papers are part of the series, NOAA Technical Memoranda NWS. Papers that have a PB or COM number are available from the National Technical Information Service, U. S. Department of Commerce, 5285 Port Royal Road, Springfield, VA 22151. Order by accession number shown in parenthesis at the end of each entry. Prices vary for all paper copies. -
News and Notes Notes
NEWS AND news and notes Notes NWS To Play Key Role in Winter Olympics million people during the Olympic Winter Games. We In a few short months, the eyes of the world will will continually provide the latest high-tech weather, turn to Utah as an estimated 3500 athletes and officials water and climate information," said Jack Kelly, di- from 80 countries will participate in the XIX Olym- rector of the NWS. "The public will be relying on us pic Winter Games. as they plan their commute from venue to venue and The Salt Lake Organizing Committee (SLOC) for how to protect themselves from the outdoor elements." the Olympic Winter Games of 2002 today announced At least twice each day, the weather service will a unique partnership between NOAA's NWS, the Uni- issue a special hazardous winter forecast during the versity of Utah, and Salt Lake City's KSL-TV to pro- games for the various transportation corridors leading vide the most accurate, timely, and venue-specific to the Olympic venues. This forecast will aid the pub- weather forecasts during the Games. lic who will be traveling to and from the various "park The Winter Olympics will be staged in Northern and ride" lots and also help transportation officials en- Utah 8-24 February 2002. With the Wasatch Moun- sure a smooth flow of traffic. tains rising more than 11,000 feet as they form the dra- "We want everyone to be weather-wise and matic perimeter of Salt Lake City, the city and weather-safe during the Games. -
Dsc Annual Report 2004-05
THE BEST EDUCATION UNDER THE SUN DIXIE STATE COLLEGE | ANNUAL REPORT 2004 - 2005 Table of Contents 2 PRESIDENT’S MESSAGE 3 ACADEMIC SUCCESSES 4 HEALTH SCIENCES SUCCESSES 6 CULTURAL ARTS SUCCESSES 8 ATHLETICS SUCCESSES 10 STUDENT SUCCESSES 13 FACULTY & STAFF SUCCESSES 15 SECURING THE FUTURE 16 ENROLLMENT & FINANCIAL DATA BOARD OF TRUSTEES e g a R OBERT s — D . R C. s HUDDLESTON e PRESIDENT STEPHEN W. WADE JEANNINE H. HOLT MARY L. CHAMBERLAIN SHANDON D. GUBLER Chairman of the Board Vice Chair Trustee Trustee he 2004-05 academic year was an enormously successful one at Dixie State College in so many M T regards. Among the most notable events this past year s was the college being granted a mission expansion, ’ which will open the doors to more and more bac- calaureate degrees on the Dixie campus. Outside the college being granted four-year status originally in t 2000, this is the most significant milestone Dixie has JAKE HUNT L. ROYCE JONES ROBERT S. MOORE D. WILLIAMS RONNOW n ever experienced. The growth and future growth of ASDSC President Trustee Trustee Trustee e Washington County dictated this change in mission. d i The educational and economic implications of this new s mission will be felt throughout the county and state. e r This past year marked my last as president of this great institution. For 12 years, I’ve watched Dixie State’s P students, faculty, and staff accomplish great things. The 2004-05 year was no different. The people at Dixie State College, at all levels, have made it the wonderful RON D. -
THE BOW ECHO and MCV EXPERIMENT Observations and Opportunities
THE BOW ECHO AND MCV EXPERIMENT Observations and Opportunities BY CHRISTOPHER DAVIS, NOLAN ATKINS, DIANA BARTELS, LANCE BOSART, MICHAEL CONIGLIO, GEORGE BRYAN, WILLIAM COTTON, DAVID DOWELL, BRIAN JEWETT, ROBERT JOHNS,* DAVID JORGENSEN, JASON KNIEVEL, KEVIN KNUPP, WEN-CHAU LEE, GREGORY MCFARQUHAR, JAMES MOORE, RON PRZYBYLINSKI, ROBERT RAUBER, BRADLEY SMULL, ROBERT TRAPP, STANLEY TRIER, ROGER WAKIMOTO, MORRIS WEISMAN, AND CONRAD ZIEGLER The field campaign, involving multiple aircraft and ground-based instruments, documented numerous long-lived mesoscale convective systems, many producing strong surface winds and exhibiting mesoscale rotation. hile the observational study of mesoscale Kansas Preliminary Regional Experiment for convective systems (MCSs) has been active Stormscale Operational and Research Meteorology W since the 1940s (e.g., Newton 1950 and ref- (STORM)-Central (PRE-STORM) (Cunning 1986) erences within), until the Bow Echo and Mesoscale were geographically fixed by the ground-based instru- Convective Vortex Experiment (BAMEX) there were ment networks employed. The unique observing no studies designed to sample multiscale aspects of strategy of BAMEX relied on the deployment of these systems throughout the majority of their life highly mobile observing systems, both airborne and cycles. Previous field studies such as the Oklahoma- ground based, supported by the enhanced operational AFFILIATIONS: DAVIS, BRYAN, DOWELL, KNIEVEL, BARTELS, LEE, Missouri; SMULL—NSSL, and University of Washington, Seattle, TRIER, AND WEISMAN—National -
Southwestern Illinois Tornado Event June 1St, 1999
Southwestern Illinois Tornado Event Title of Event June 1st, 1999 (Calibri 20 pt. – BOLD) St. Louis All sections have a title Overview Calibri (Body) 16 pt. – BOLD Strong to severe thunderstorms moved across the bi-state region during the late afternoon and early evening June 1st, 1999. A number of these storms evolved into tornado producing supercells while other storms produced damaging winds and hail. This severe All of the descriptive text is written in storm event was rather challenging since three supercells containing moderate to strong mesocyclones moved from the southwest across the southwest sections of our County Calibri (Body) 11 pt. Warning Area (CWA) between 6:45 and 7:30 PM CDT. During this same period, three other supercells rapidly formed over the northeast quadrant of our CWA (far northeast General Ordering of Content Macoupin/northern Montgomery counties in Illinois). This case was particularly challenging since we were focusing our energies on nearly opposite ends of our CWA. Two of the three supercells to our southwest spawned tornadoes over Phelps and Crawford counties in 1) Overview Section giving a south-central Missouri. At nearly the same time, two of the three supercells over northern Montgomery county in central Illinois also produced two tornadoes (near or after 7:00 PM description of the event CDT). A fourth supercell rapidly formed after 7:40 PM CDT and developed yet another 2) Overview Map - damage tracks tornado over parts of eastern Fayette county Illinois just after 8:00 PM CDT. map, hail swath graphic, -
BAMEX Aircraft Operations Will Cover Several Regions of the FAA National Airspace System
BAMEX Operations Plan Table of Contents 1 Overview of BAMEX Operations .......................................................................................... 2 2 Aircraft Operations................................................................................................................. 2 2.1 Aircraft Overview...........................................................................................................2 2.2 Operational Domain........................................................................................................ 3 2.3 Aircraft Operational Guidelines...................................................................................... 4 2.4 Aircraft Scientific Crew Duties ...................................................................................... 5 2.5 Aircraft Communications................................................................................................ 9 2.6 Post-Flight Procedures.................................................................................................. 11 2.7 Bow-Echo Flight Patterns............................................................................................. 12 2.8 MCV Flight Patterns..................................................................................................... 22 2.9 Damage Surveys........................................................................................................... 25 3 GBOS Operations................................................................................................................ -
"Super Derecho"
3B.2. Environment and early evolution of the 8 May 2009 “Super Derecho” Stephen F. Corfidi*1, Michael C. Coniglio 2, and John S. Kain 2 1 NOAA/NWS/NCEP Storm Prediction Center, Norman, Oklahoma 2 NOAA/OAR National Severe Storms Laboratory, Norman, Oklahoma 1. INTRODUCTION environment over the central plains on 8 May 2009. In particular, analyses from this event are compared This study documents the complex to those from other MCSs that have occurred over environment and early evolution of the remarkable much the same region and time of year. Although the derecho-producing convective system that crossed genesis and evolution of the MCV was a significant part of the central United States on 8 May 2009 (Fig. part of this event, the focus here is on the 1a). The derecho (Johns and Hirt 1987) severely environment and early evolution of the convective damaged buildings, utility lines, and trees over a system prior to the development of the MCV. We widespread area from western Kansas to eastern emphasize the system’s early evolution since it is Kentucky as a result of multiple wind gusts > 35 m s-1 likely that the ability to accurately predict convective and isolated gusts > 45 m s-1 (Fig. 1b). The systems of this type is strongly related to a detailed associated mesoscale convective system (MCS; understanding of the processes and environmental Zipser 1982) contained bow echoes (Fujita 1978) ingredients that can create such a system. during part of its lifetime, and an intense, long-lived mesoscale convective vortex (MCV; Davis and Trier 2007) developed during the latter stage of the MCS 2. -
Observations from the 23 August 2007 Chicago Derecho
6.6 OBSERVATIONS FROM THE 23 AUGUST 2007 CHICAGO DERECHO Gino Izzi* National Weather Service, Romeoville, IL Ron Przybylinski National Weather Service, Saint Charles, MO Angela Lese National Weather Service, Louisville, KY Ryan Coomer Northern Illinois University, DeKalb, IL 1. Introduction al. 2004, Atkins et al. 2005, Przybylinski et al. 2006) have shown that mesovortices along the During the afternoon of 23 August 2007, a leading edge of QLCSs tend to produce paths of quasi-linear convective system (QLCS) with intense and concentrated wind damage and embedded bowing line segments moved across sometimes tornadoes. the Lower Great Lakes and produced a nearly continuous swath of wind damage extending from northwest Illinois eastward into southeast Lower Michigan. There were multiple reports of wind gusts in excess of 35 ms -1, wind damage of up to EF-1 intensity, as well as two brief tornadoes along the path of this convective system across northern Illinois. The number, intensity, and time span of the reports were such that this QLCS can be classified as a derecho (Johns and Hirt 1987). This derecho-producing convective system (DCS) moved across densely populated areas of northeast Illinois during the mid-afternoon, injuring approximately four dozen people, some severely, and resulted in two confirmed fatalities. Other casualties were reported in the region, though outside of the immediate Chicago Metropolitan area. In addition to the human casualties, this Fig. 1. Map of tracks of the vortices associated with the storm caused an estimated five million dollars in northern bowing segment. Red lines are the tracks of the property damage, including the destruction of mesovortices, while the blue lines depict the tracks of the line several buildings, just in northeast Illinois alone. -
THE EARTH OBSERVER a Bimonthly EOS Publication January/February 2002, Vol
rvin bse g S O ys th t r e a m E THE EARTH OBSERVER A Bimonthly EOS Publication January/February 2002, Vol. 14, No. 1 In this issue ... EDITOR’S CORNER Michael King SCIENCE TEAM MEETINGS EOS Senior Project Scientist Minutes from the MODIS Science Following up on my previous announcement that the Meteor 3M Stratospheric Team Meeting ................................ 3 Aerosol and Gas Experiment (SAGE III) instrument was successfully launched Minutes from the CERES Science Team on December 10, I'm pleased to report that SAGE III has completed all post- Meeting .......................................... 9 launch calibration exercises, and is now routinely acquiring both sunrise and sunset occultation data. Preliminary analysis of Lunar Level 2 data products Minutes from the Meeting of the Federation of Earth Science Informa- (NO2, NO3, and O3) indicates good agreement with profiles from LaRC's 2- tion Partners ................................. 14 dimensional atmospheric chemistry model. Overall, the instrument is perform- ing as expected, albeit with high signal-to-noise ratio measurements. Additional OTHER ARTICLES refinement of the data is necessary due to the lack of GPS navigation data KUDOS: AGU Announces Fellows .. 2 onboard the Meteor 3M Spacecraft. However, the SAGE III team is seeking support from the International Laser Ranging Service to provide satellite Earth Science Enterprise at the positioning information with sufficient accuracy to meet the instrument's Olympics ..................................... 16 retrieval processing requirements. SAGE III will extend important observations NASA Study Links El Niño and of aerosols, ozone, water vapor, and other important trace gases in the upper Southern Ocean Changes ............. 17 troposphere and stratosphere made by SAGE and SAGE II.