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Murray&Trettel/Weather Command® Empowering Decision Makers 24/7™ 1/23/2020 Through 1/28/2020 DATE: THURSDAY, JANUARY 23, 2020 TIME: 6:28 AM FCSTR: MM (847-963-9000 ext 2) www.weathercommand.com CHICAGO CLIMATOLOGY Normals High/Low: 31/16 Yesterday's High 34/Low 24 Yesterday's Rain T/Snow T Records High 65/1909 Low -18/1963 GENERAL FORECAST DISCUSSION LIGHT SNOW SHOWERS DIMINISH TO FLURRIES THIS MORNING. TRACE AMOUNTS MAINLY, WITH SMALL CHANCE FOR 0.1" ADDITIONAL ACCUMULATION THIS MORNING. PRECIPITATION WILL INCREASE TO LIGHT SNOW TONIGHT AND CONTINUE INTO EARLY FRIDAY. PRECIPITATION WILL THEN DIMINISH TO DRIZZLE/FLURRIES FOR MUCH OF FRIDAY, BEFORE TURNING BACK TO SNOW LATE FRIDAY NIGHT AND TRAILING INTO THE START OF THE WEEKEND. PRECIPITATION WILL THEN END AS FLURRIES/DRIZZLE SATURDAY. CONDITIONS TURN DRY FOR SUNDAY AND PERSIST THROUGH TUESDAY. TEMPERATURES SHORT TERM FORECAST PRECIPITATION TODAY Y6 G4 CLOUDY WITH SNOW SHOWERS AND FLURRIES THROUGH LATE MORNING. LT SNOW TR-1/4" INTERMITTENT FLURRIES POSSIBLE FOR THE AFTERNOON. High: 34 Aurora POP=100% Start:NOW Changes to VRY LT SNOW AT 11AM WIND CHILL: 25 POP=30% Trace End:NIGHT SNOW Wind: S 10 to 15 mph Shifts SE 8 to 13 at 2PM TONIGHT Y8 G2 FLURRIES INCREASE TO LIGHT SNOW BY LATE EVENING AND CONTINUES VRY LT SNOW Trace THROUGH THE OVERNIGHT. OTHERWISE, CLOUDY AND NOT AS COLD. Low: 31 Aurora POP=30% Start:DAY Changes to LT SNOW AT 11PM WIND CHILL: 22 POP=60% < 1/2" End:FRI SNOW Gusts 20 Wind: SE 8 to 13 mph Shifts E 10 to 15 at 3AM FRIDAY Y8 G2 CLOUDY WITH LIGHT SNOW IN THE MORNING. PRECIPITATION CHANGES TO LT SNOW < 1/2" DRIZZLE/FLURRIES FOR THE AFTERNOON. High: 35 Aurora POP=60% Start:ONGOING Changes to LT RAIN AND SNOW AT 12PM WIND CHILL: 27 POP=60% < .1 in End:SAT Wind: E 12 mph, Shifts NE 10 at 12PM Gusts 22 FRI NIGHT G6 Y4 DRIZZLE/FLURRIES CHANGE TO A SNOW/RAIN MIX LATE AND CONTINUE LT RAIN AND SNOW < .1 in OVERNIGHT. OTHERWISE, MOSTLY CLOUDY. Low: 32 Aurora POP=60% Start:ONGOING Changes to SNOW/MIXED LT RAIN AT 10PM WIND CHILL: 24 POP=60% Trace End:SAT Wind: NE 8 to 13, Shifts N 8 to 13 at 10PM MEDIUM RANGE FORECAST SATURDAY Y6 G4 LIGHT SNOW SHOWERS DIMINISHING TO FLURRIES BY LATE MORNING. LT SNOW SHWRS TR-1/4" FLURRIES COULD LINGER AND MIX WITH A BIT OF DRIZZLE THROUGH LATE High: 34 Aurora AFTERNOON. POP=60% Start:FRI Changes to FLURRIES & DRIZZLE AT 10AM WIND CHILL: 26 POP=30% Trace End:4PM Wind: NW 12 mph, Shifts WNW 10 at 6PM Gusts 22 SUNDAY G10 BECOMING PARTLY SUNNY. NONE Low/High: 27/33 Aurora WIND CHILL: 18(am)/27(pm) Wind: W 5 to 10 mph MONDAY G10 PARTLY SUNNY AND SLIGHTLY WARMER. NONE Low/High: 25/35 Aurora WIND CHILL: 17(am)/31(pm) Wind: W 3 to 8 mph TUESDAY G10 SUNSHINE THROUGH HIGH CLOUDINESS. NONE Low/High: 25/36 Aurora WIND CHILL: 19(am)/32(pm) Wind: SE 3 to 8 mph G=Green=None Y=Yellow=Minor R=Red=Significant B=Black=Major Operational Trouble Color Codes shown as a Percentage (example Y7 = 70% chance for Minor Trouble).

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METAR/SPECI Reporting Changes for Snow Pellets (GS) and Hail (GR)
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World Meteorological Organization Global Atmosphere Watch
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Department of Commerce • National Oceanic
Department of Commerce · National Oceanic & Atmospheric Administration · National Weather Service NATIONAL WEATHER SERVICE INSTRUCTION 10-1004 MAY 17, 2020 Operations and Services Climate Services, NWSPD 10-10 CLIMATE RECORDS NOTICE: This publication is available at: http://www.nws.noaa.gov/directives/ OPR: W/AFS23 (J. Zdrojewski) Certified by: W/AFS23 (F. Horsfall) Type of Issuance: Routine SUMMARY OF REVISIONS: This instruction supersedes National Weather Service Instruction 10-1004, dated January 1, 2018 and contains these changes: • Updated links • Added comment to section 3.1 defining the use of abbreviation for PLCD/SLCD • Updated sites in Appendix C Digitally signed by STERN.ANDRSTERN.ANDREW.D.138 2920348 EW.D.138292 Date: 2020.05.03 0348 18:44:46 -04'00' 05/03/2020 Andrew D. Stern Date Director, Analyze, Forecast, and Support Office NWSI 10-1004 MAY 17, 2020 Table of Contents Page 1 Introduction 4 2 Surface Station Observation Data 4 2.1 Surface Station Data Correction ...................................................................................... 5 3 Surface Station Long Term Normals, Means, and Extremes 5 3.1 Definitions ....................................................................................................................... 5 3.2 Final Source of Normals.................................................................................................. 6 3.3 Effective Date of Normals ............................................................................................... 6 3.4 Calculation of Normals
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Appendix B – Glossary of Terms
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Measuring Snow
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