Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 121, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Aug 8, 2002, 8:42 PM CDT for Mellette County, South Dakota. It was in force for 48 min. 2 reports 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 8, 2002, 8:42 PM CDT (01:42 UTC)
- Expired
- Aug 8, 2002, 9:30 PM CDT
- In force
- 48 min
- Issued by
- NWS Rapid City, SD
- Area
- Counties, with a storm outline in the text
County Mellette County, SD
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 8, 8:55 PM CDT | Hail 1 | Norris, SD | |
| Aug 8, 9:28 PM CDT | Hail 0.88 | White River, SD |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 8, 2:10 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.7 hours before the alert went out and 238 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
- 678 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 1867 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 32 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 8, 2:55 PM CDT, 5 hours 47 minutes earlier.
Area forecast discussion, Aug 8, 2:55 PM CDT, 5 hours 47 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 155 PM MDT THU AUG 8 2002 ...SEVERE THUNDERSTORM WATCH ENTIRE AREA EXCEPT CAMPBELL COUNTY WYOMING THIS EVENING... VIGOROUS PACIFIC SHORT WAVE MOVING INTO THE NORTHERN PLAINS THIS AFTERNOON WILL CONTINUE TO PRODUCE INTENSE THUNDERSTORM ACTIVITY AS IT MOVES OUT OF SOUTHERN MONTANA INTO NORTHEAST WYOMING AND WESTERN SOUTH DAKOTA. FORECAST HODOGRAPHS INDICATE A PREFERENCE FOR LINEAR ORGANIZATION...STRONG WINDS AND LARGE HAIL. THE WINDS ARE OF PARTICULAR CONCERN FOR NWRN SD...N AND NE OF THE BLACK HILLS...SINCE THE SHORT WAVE WILL CONTRIBUTE 50+ MPH WIND SPEEDS TO THE MID LEVELS OF THE ATMOSPHERE ACROSS WRN SD BY MIDNIGHT. SEVERE WEATHER OPERATIONS IN PROGRESS AT UNR. ONLY MINOR ADJUSTMENTS WERE MADE TO LATER PERIODS OF THE PACKAGE. A SOMEWHAT UNSTABLE NW FLOW WILL KEEP THE WEATHER MODERATELY ACTIVE THROUGH THE END OF THE WEEK...THEN LARGE SCALE SUBSIDENCE AND DRY AIR WILL PROVIDE A RESPITE FROM MIDDAY SATURDAY THROUGH SUNDAY. SUMMERTIME HEATING AND A WEAK MID LEVEL SHORT WAVE WILL PRODUCE SOME WEATHER MON AND TUE...WITH FAIR SKIES DOMINATING WED AND THU. .UNR...NONE. CARPENTER
In the hours before
Local storm report, Aug 8, 6:37 PM CDT, 2 hours 5 minutes before
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</html>The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 7:41 PM CDT | Severe Thunderstorm Warning | UNR | Todd | 34 min |
| Aug 8, 9:28 PM CDT | Severe Thunderstorm Warning | UNR | Mellette | 32 min |
| Aug 8, 10:22 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 53 min |
| Aug 9, 5:09 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 36 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 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.