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 28, 1:25 PM MST, 4 hours 53 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 225 PM MDT WED AUG 28 2002 WV IMAGERY SHOWING S/WV TROF MVG ACRS NW CO/SOUTH CENTRAL WY...WITH 60KT H3 JET ENERGY EVIDENT VIA CIRRUS BANDS MVG INTO SW CO. ANOTHER NIGHT OF SHWRS/TSTMS ACRS THE FA...WITH MOST NUMEROUS ACTIVITY OVR THE SE WY PLAINS INTO THE PANHANDLE. H8-H7 THETA-E RIDGE AXIS NOSING INTO SE WY THIS EVENING...WITH H3 DIVERGENCE FIELDS FOCUSING BETWEEN CYS-SNY. ABUNDANT LOW LVL MSTR OVR ERN AREAS...WITH SFC DWPTS IN THE 50S TO LWR 60S AND PLENTY OF STRATO-CU. LACK OF DAYTIME HEATING DUE TO LOW CLDS OVR ERN AREAS MAY HELP TO INHIBIT SOME OF THE CONVECTION IN THE NEAR TERM...BUT ENOUGH INSTABILITY AND FORCING THIS EVENING TO PRODUCE SCT STRONG/SEVERE TSTMS. I HAVE SOME CONCERN ABOUT FLASH FLOODING POTENTIAL OVR ERN AREAS...WITH PW/S OF 1.0 TO 1.3 INCHES AND THE PAST FEW NIGHTS OF LCLY HVY RAIN. GIVEN THE MORE LOCAL NATURE OF THE FLASH FLOOD POTENTIAL TONIGHT...I WL NOT ISSUE A FFA. UPR LOW OVR SRN ID BEGINS TO GRADUALLY OPEN UP ON THU...AND DRIER AIR BEGINS TO MOVE INTO SOUTH CENTRAL PARTS OF WY. STILL PLENTY OF LOW LVL MSTR/INSTABILITY/DEEP SHEAR AND UPR DIVERGENCE OVR ERN AREAS...SO ANOTHER ROUND OF SHWRS/TSTMS THU-THU NITE. H8-H7 THETA-E AXIS SHIFTS A LITTLE FURTHER EAST ON THU...SO MAIN PCPN FOCUS MAY BE MORE TOWARD THE PANHANDLE THAN OVR WY. UPR/SFC PATTERN FINALLY TURNS TOWARD DRIER WESTERLY FRI-SAT...AS UPR LOW OVR ID LIFTS OUT. CURRENT FCST FOR HAS DRY BOTH PERIODS...AND THIS LOOKS GOOD. .EXTENDED... WEAK COLD FRONT WILL WORK ITS WAY INTO THE FORECAST AREA EARLY MONDAY...WITH ASSOCIATED WIND SHIFT. THERE IS A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS ON SUNDAY AHEAD OF THE FRONT....WITH DECREASING CHANCE OF RAIN BEHIND THE FRONT. MONDAY LOOKS TO BE MOSTLY DRY...WITH A CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS RETURNING TO THE FORECAST TUESDAY AND WEDNESDAY AS A WEAK UPPER TROUGH MOVES THROUGH. .CYS... WY...NONE. NE...NONE. JK/RGB
The Cheyenne radar (KCYS), 30 km away, was scanning. The volume nearest the first event began at 01:18 UTC.
1 tornado. Local standard time, as filed.
Tornado moved over open country but caused some damage to power lines and out buildings.
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: 5310935.