Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 28, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jun 20, 2002, 9:02 PM MDT for Campbell County, Wyoming. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 20, 2002, 9:02 PM MDT (03:02 UTC)
- Expired
- Jun 20, 2002, 10:00 PM MDT
- In force
- 58 min
- Issued by
- NWS Rapid City, SD
- Area
- Counties, with a storm outline in the text
County Campbell County, WY
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 3.0 hours before the alert went out and 214 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2000 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 197 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 6 hours 2 minutes earlier.
Area forecast discussion, Jun 20, 3:00 PM MDT, 6 hours 2 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 office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 7:03 PM MDT | Severe Thunderstorm Warning | UNR | Campbell | 42 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2002Every 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; the sounding from the Mesonet's radiosonde archive.