Wyoming, 2002

Hail in Wyoming, June 20, 2002

June 20, 2002 · NWS UNR · 2 events in 2 counties and zones

2 hail, as filed by the National Weather Service.

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
2

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 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 Jun 20, 2:00 PM MST, 1 hour 50 minutes earlier.

Area forecast discussion, Jun 20, 2:00 PM MST, 1 hour 50 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY
300 PM MDT THU JUN 20 2002

SW FLOW ALOFT ACRS CWFA AHEAD OF LONG WAVE TROUGH ALG WEST COAST.
SFC HI PRES OVR UPR MID-WEST WITH STRONG RETURN FLOW ACRS AREA.
SHORT WAVE EJECTING INTO ROCKIES COMBINED WITH HEATING/INSTABILITY
FIRING CONVECTION OVR CNTRL/ERN WY SOUTHWARD ATTM.

CONVECTION OVR WY EXPECTED TO LIFT NE TOWARDS SOUTHERN PORTIONS OF
CWFA TONIGHT. INCRSG LO LVL JET WILL PUMP HIGHER BL DEWPOINTS INTO
SRN ZONES...WITH ETA SHOWING IMPRESSIVE THETA-E ADVECTION. CORFIDI
VECTORS SHOULD STEER ANY ORGANIZED CONVECTION EASTWARD ACRS SRN
ZONES...SO EXPECT LITTLE NORTH OF I-90. SHEAR QUITE HIGH ALLOWING
STORMS TO ROTATE...AND HODOGRAPHS SHOW VERY SLOW
MOVEMENT...THEREFORE POTENTIAL FOR HEAVY RAINS POSSIBLE.

SFC LOW DEEPENS TOMORROW OVR WY WITH WMFNT LIFTING ACRS CWFA.  CAPES
OF 3000-4000J/KG MAY BE WASTED WITH STRONG CAP IN PLACE...ALTHOUGH
DO EXPECT TEMPS WELL INTO THE 90S ACRS SRN ZONES SO CANT RULE OUT
CAP BREAKING IN A FEW PLACES SRN ZONES.  LESS CAP NORTH OF WMFNT
WITH BETTER CHANCE OF STORMS NWRN ZONES.  NEARLY SAME SET UP THEN
AGAIN SAT AS LOW CROSSES CWFA...WITH BEST CHANCES CONVECTION NWRN
ZONES. VERY WARM TEMPS AGAIN WITH HIGHS TO 100 IN SOME PLACES S.

CONVECTION STILL POSSIBLE SUN AS UPR TROUGH APPRCHS.

EXTENDED...ADDED TSTMS ON MON AS UPR TROUGH SHOWING A BIT SLOWER EWD
PROGRESSION THAT PREVIOUS RUNS.  STRONG UPR RIDGE THEN BUILDS FOR
WARM AND MOSTLY DRY CONDS DAYS 5-7.  EVEN THOUGH LONGER RANGE
GUIDANCE SUGGESTS A FEW WAVES MAY BUST THROUGH RIDGE...EXPECT RIDGE
WILL BE TOO STRONG FOR MUCH TO HAPPEN.

.UNR...NONE.
JOHNSON

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

2 hail. Local standard time, as filed.

Hail, Weston

When
June 20, 3:50 PM MST
Where
Weston County, 16 mi SW of Upton
Measured
0.75 in hail
Reported by
TRAINED SPOTTER
Coordinates
43.933, -104.867

Hail, Campbell

When
June 20, 6:05 PM MST
Where
Campbell County, Gillette
Measured
0.75 in hail
Reported by
TRAINED SPOTTER
Coordinates
44.283, -105.483

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 2002Every state in 2002This day in weather historyWarnings in Wyoming, June 2002

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: 5297529, 5297530.