Name: Hail in Wyoming, May 28, 2001
Start: 2001-05-28T17:05
End: 2001-05-28T17:12
Location: Wyoming

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

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.

What happened

The episode as NWS UNR wrote it up.

An isolated severe thunderstorm produced dime sized hail over Upton for 7 minutes.

What forecasters said that day

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 Rapid City, SD wrote its last area forecast discussion before the first event at May 28, 1:20 PM MST, 3 hours 45 minutes earlier.

Area forecast discussion, May 28, 1:20 PM MST, 3 hours 45 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
220 PM MDT MON MAY 28 2001

WK TSRA HAS DEVELOPED OVR THE NRN BLK HLS AND BEARLODGE...THE
FAVORED CONVECTIVE LOCATION GIVEN S LLVL FLOW. EXPECT TO SEE THIS
INCREASE INTO THE EVENING. THERE MAY BE A BRIEF BREAK IN THE ACTION
A FEW HOURS EITHER SIDE OF MIDNIGHT AHEAD OF WK WAVE WHICH IS
CURRENTLY PRODUCING STORMS OVR SRN WY AND NRN CO. EITHER WAY...MDLS
AGREE WITH SUBSTANTIAL QPF OVR WRN SD OVER THE NEXT 24 HOURS OR SO.
THIS DUE TO WK CAP...LLVL UPSLOPE FLOW AND WK UPPER WAVE. GIVEN WK
FLOW...STORM MOTION OF RELATIVELY UNORGANIZED PRECIP TO BE TO THE N
LESS THAN 15 KTS. THIS MEANS THAT LOCALLY HEAVY RAIN WILL BE
POSSIBLE...BUT FAR BELOW FF GUIDANCE. RADAR HAS ALREADY ESTIMATED
SMALL POCKET OF 1.5-2 INCHES OF RAIN OVR NW LAWRENCE CO IN THE NRN
BLK HLS. MAY PUT THIS WORDING IN THE ZONES. AFTER THIS WAVE PASSES A
GLANCING SHOT OF COOLER AIR FROM PAC CD FNT WILL MOVE THROUGH BY
WED...DROPPING TEMPS A FEW NOTCHES FROM THE PREVIOUS FEW DAYS. AFTER
THAT STRONG RIDGING TO OCCUR THIS WEEKEND...MEANING MUCH WARMER
TEMPS. WILL GO ABOVE MEX AND FMR GUIDANCE IN THE EXTENDED AS MRF
FORECASTING 12 TO 16C 700MB AIR OVR WRN SD BY SAT THUS GUIDANCE
LIKELY WAY TOO LOW. AS WRN US TROF FORMS SUN AND MON...RIDGE GETS
DISPLACED TO THE E OF THE CWA WHICH COULD MEAN A MORE ACTIVE PRECIP
PATERN FOR US AS WK DISTURBANCES MOVE THROUGH IN SW FLOW ALOFT.
BECAUSE OF THAT HAVE PUT A CHC OF TSRA INTO SUN AND MON PDS IN THE
EXTENDED.

.UNR...NONE.
BAILEY

The radar

The Rapid City radar (KUDX), 144 km away, was scanning. The volume nearest the first event began at 00:05 UTC.

Open the radar archive at this moment

Event by event

1 hail. Local standard time, as filed.

Hail, Weston

When: May 28, 5:05 PM MST to 5:12 PM MST
Where: Weston County, Upton
Measured: 0.75 in hail
Reported by: TRAINED SPOTTER
Coordinates: 44.100, -104.633

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Wyoming in 2001 Every state in 2001 This day in weather history Warnings in Wyoming, May 2001

Sources

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: 5246921.