Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 26, NWS Rapid City, SD

June 20, 2002Weston County, Wyoming

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 20, 2002, 4:49 PM MDT for Weston County, Wyoming. It was in force for 41 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 20, 2002, 4:49 PM MDT (22:49 UTC)
Expired: Jun 20, 2002, 5:30 PM MDT
In force: 41 min
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Weston County, WY

What was reported inside it

Time	Report	Where	Remark
Jun 20, 4:50 PM MDT	Hail 0.75	Upton, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jun 20, 3:00 PM MDT, 1 hour 49 minutes earlier.

Area forecast discussion, Jun 20, 3:00 PM MDT, 1 hour 49 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

Nearby

Severe Thunderstorm Warnings in Wyoming, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data.