Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 154, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Aug 25, 2002, 5:38 PM MDT for Crook County, Wyoming. It was in force for 67 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
- Aug 25, 2002, 5:38 PM MDT (23:38 UTC)
- Expired
- Aug 25, 2002, 6:45 PM MDT
- In force
- 67 min
- Issued by
- NWS Rapid City, SD
- Area
- Counties, with a storm outline in the text
County Crook County, WY
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 25, 6:05 PM MDT | Hail 0.75 | Hulett, 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.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.6 hours before the alert went out and 386 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
- 452 J/kg
- Mixed-layer CIN
- -223 J/kg
- Mixed-layer LCL
- 1862 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -73 m²/s²
- 0-3 km storm-relative helicity
- -65 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 Aug 25, 3:20 PM MDT, 2 hours 18 minutes earlier.
Area forecast discussion, Aug 25, 3:20 PM MDT, 2 hours 18 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY...UPDATED NATIONAL WEATHER SERVICE RAPID CITY SD 320 PM MDT SUN AUG 25 2002 WATER VAPOR DEPICTS UPR LOW OVR MT...WITH WEAK RIDGING EXTENDING NORTH THROUGH THE CNTRL ROCKIES. SFC TROF DVLPG IN THE LEE OF ROCKIES...WITH HIGH PRESSURE OVR CNTRL PLAINS RESULTING IN RETURN FLOW ACRS CWFA. STRONG CONVECTION STARTING TO FIRE OVR ERN MT AND WRN ND. WILL CONT TO SEE ISOLD PULSE TSTMS OVR BLKHLS INTO THIS EVE AS CAP HAS ERODED. AMS HAS DRIED AND MID-LVL FLOW PICKED UP...THEREFORE THREAT OF HEAVY RAINS AND SLOW MOVG TSTMS IS MINIMAL THIS EVE. TSTM ACTIVITY WILL LIKELY CONT TO DVLP ACRS ERN MT AND WRN ND. 18Z ETA/RUC BEGINNING TO PICK UP ON THIS ACTIVITY AND SPRDG IT E/SE TNGT. CORFIDI VECTORS SUGGEST IF THIS ACTIVITY EVOLVES INTO MCS IT WILL TRAVEL ESE...AFFECTING NWRN ZONES. ADDITIONALLY...LO LVL JET INCREASES LATER TONIGHT ACRS SRN ZONES WITH MUCAPE VALUES OF 1000-1500J/KG ALG WITH GOOD THETA-E ADVECTION. THEREFORE IF AN MCS DVLPS IT WILL HAVE THE POTENTIAL TO DVLP SWD ACRS ERN HALF OF ZONES. HOWEVER...IF MCS REMAINS TOO FAR NORTH...THERE WILL STILL BE DECENT SHOT OF SEEING ISOLD CONVECTION ACRS SRN/ERN ZONES AS ENOUGH UVV WILL BE IN PLACE. UPR LVL TROFING REMAINS THE DOMINANT FEATURE FROM THE PAC NW TO NRN ROCKIES THRU MID WEEK. IT WILL BE QUITE DIFFICULT TO TIME/POSITION SHORT WAVES EMBEDDED IN UNSTABLE SW FLOW...THEREFORE CHC OF POP WARRANTED THROUGH ENTIRE 1-3 DAY FCST. TEMPS WILL REMAIN FAIRLY CONSISTENT DURING THIS PD AS WELL. EXTENDED...CONTD TROFING WITH UNSETTLED WX PATTER EXPECTED THROUGH FRI...WITH LONGER RANGE GUIDANCE SHOWING SOME HINT OF SHORT WAVE RIDGING ON SAT. A MORE PROGRESSIVE TROF SWINGS THRU NRN PLAINS DAY 7 FOR RETURN TO UNSETTLED WX AND SLIGHT COOL DOWN. .UNR...NONE JOHNSON
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.