Alert archive / Iowa / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 332, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 2002, 11:25 PM CDT for Clay County, Iowa. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2002, 11:25 PM CDT (04:25 UTC)
- Expired
- Aug 17, 2002, 12:00 AM CDT
- In force
- 35 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Clay County, IA
The radar
The Sioux Falls radar (KFSD), 137 km from the middle of the area, began a volume at 04:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.4 hours before the alert went out and 215 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
- 3070 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 597 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 18.4
The text
As transmitted, in the capitals the NWS used until 2016.
225 WUUS53 KFSD 170425 SVRFSD IAC041-170500- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1125 PM CDT FRI AUG 16 2002 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLAY COUNTY IN NORTHWEST IOWA * UNTIL MIDNIGHT CDT * AT 1125 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF ROYAL...OR ABOUT 15 MILES SOUTHWEST OF SPENCER...MOVING EAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... ROYAL AROUND 1130 PM CDT GREENVILLE AROUND 1140 PM CDT WEBB AROUND 1150 PM CDT THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4313 9538 4292 9539 4292 9493 4314 9495 BOUSTEAD
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 9:23 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 52 min |
| Aug 16, 9:45 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 45 min |
| Aug 16, 10:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 45 min |
| Aug 16, 11:03 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 37 min |
| Aug 17, 12:49 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 26 min |
| Aug 17, 1:06 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 39 min |
| Aug 17, 1:08 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 37 min |
| Aug 17, 1:13 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 32 min |
| Aug 17, 1:15 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 45 min |
| Aug 17, 1:35 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 40 min |
| Aug 17, 1:39 AM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 36 min |
| Aug 17, 1:45 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 30 min |
| Aug 17, 2:15 AM CDT | Severe Thunderstorm Warning | FSD | Ida | 45 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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; radar from the NEXRAD Level II archive.