1 tornado, as filed by the National Weather Service.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at Aug 27, 12:45 PM MST, 7 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 145 PM MDT TUE AUG 27 2002 RATHER SIGNIFICANT UPR FTR WAS LIFTG NEWD ACRS E CNTRL WY INTO CNTRL NEB. WITH LACK OF ANY REAL UPR LIFT FOR NEXT FEW HOURS...EXPECT A FEW WEAK TSTMS TO CONTINUE TO DVLP. BY LATER THIS AFTN INTO THIS EVNG HOWEVER...UPR FTR ROUNDING BOTTOM OF UPR LOW WILL STREAK NEWD ALONG UPR JET...WITH SOME DIFFLNC ALOFT AIDING TSTMS. FOR NOW HARD TO PINPOINT AREA WITH HIGHEST POPS...WITH GO WITH ROUGHLY 30% MOST LOCATIONS TONIGHT. STILL DECENT LOW LEVEL MSTR OVER REGION EAST OF SNOWY RANGE. LATEST LAPS ANALYSIS SUGGESTS PERHAPS A WND SHFT BNDRY SETTING FROM NEAR WHEATLAND NEWD TO NEAR CDR. A FEW SHWRS POPPING UP ALONG THIS BNDRY IN NRN NEB PNHNDL...AND ALSO FIRING WEAKLY OFF THE SNOWY RANGE. SFC TEMPS ALSO NOT QUITE AS WARM AS EXPECTED...WITH AIRMASS NOT AS UNSTABLE. STILL BEARS WATCHING REST OF AFTN INTO EVNG THO. IN LATER PDS...NOT MUCH CHANGES AS S/SE LOW LEVEL FLOW CONTS OVER/E OF MTNS WHILE UPR LOW ACTUALLY DRIFTS WWD AND THEN GETS KICKED NEWD ACRS NRN RCKYS. FLOW ALOFT REMAINS SW...WITH TAIL END OF EJECTG TROF BRUSHING AREA ON THU AFTN/EVNG. FRI STILL LOOKS DRY IN WAKE OF UPR TROF...WITH TEMPS REBOUNDING SOME WITH A MRNG PD OF DOWNSLOPE WINDS. EXTENDED...MODELS FAIRLY CONSISTENT WITH YESTERDAYS RUNS. SOUTHWEST WINDS ALOFT SHOULD DEVELOP BY MIDWEEK AHEAD OF THE NEXT TROF THAT FORMS OVER THE WESTERN UNITED STATES. THIS SHOULD BRING IN A BIT MORE MOISTURE FOR A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS. THINGS DRY OUT BY LABOR DAY WEEKEND AS THE WESTERN U.S. TROF WEAKENS...WHICH WILL ALLOW WINDS ALOFT TO GO MORE WESTERLY. .CYS... WY...NONE. NE...NONE.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
631 PM MDT TUE AUG 27 2002
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0520 PM 20 NE HANNA WY 1.75 INCH HAIL
08/27/02 CARBON
0610 PM MEDICINE BOW WY 1.25 INCH HAIL
08/27/02 CARBONPRELIMINARY LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE CHEYENNE WY
721 PM MDT TUE AUG 27 2002
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0520 PM 20 NE HANNA WY 1.75 INCH HAIL
08/27/02 CARBON
0610 PM MEDICINE BOW WY 1.25 INCH HAIL
08/27/02 CARBON
0700 PM ROCK RIVER WY 1.75 INCH HAIL
08/27/02 ALBANYWYZ062>070-280230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 800 PM MDT TUE AUG 27 2002 ...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST WYOMING HAS EXPIRED... SEVERE THUNDERSTORM WATCH NUMBER 647 HAS EXPIRED AS THE OVERALL THREAT FOR SEVERE WEATHER HAS DIMINISHED. THE POSSIBILITY STILL EXISTS FOR A THUNDERSTORM OR TWO TO BECOME SEVERE OVER SOUTHEAST WYOMING THIS EVENING BUT MOST REMAINING STORMS ARE EXPECTED TO BE NON-SEVERE. && RE WCJIN-WYSE
The Cheyenne radar (KCYS), 61 km away, was scanning. The volume nearest the first event began at 02:52 UTC.
1 tornado. Local standard time, as filed.
Weak tornado briefly touched down in open country.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2002Every state in 2002This day in weather historyThe tornado archive for Wyoming, 2002Warnings in Wyoming, August 2002
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5314676.