Alert archive / Iowa / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 285, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 12, 2002, 1:42 AM CDT for Sioux County, Iowa. It was in force for 33 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 12, 2002, 1:42 AM CDT (06:42 UTC)
- Expired
- Aug 12, 2002, 2:15 AM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 64 km from the middle of the area, began a volume at 06:43 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 11, 9:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 201 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
- 1357 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 2325 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
625 WUUS53 KFSD 120642 SVRFSD IAC167-120715- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 142 AM CDT MON AUG 12 2002 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SIOUX COUNTY IN NORTHWEST IOWA * UNTIL 215 AM CDT * AT 142 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 4 MILES NORTHWEST OF ROCK VALLEY TO 6 MILES WEST OF IRETON...OR FROM 13 MILES EAST OF CANTON TO 3 MILES SOUTHEAST OF HAWARDEN...MOVING EAST AT 45 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... SIOUX CENTER...HULL AROUND 150 AM CDT MAURICE AROUND 155 AM CDT ORANGE CITY...BOYDEN AROUND 200 AM CDT ALTON AROUND 205 AM CDT THIS STORM WILL PRODUCE LARGE HAIL AND DAMAGING WIND. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS. LAT...LON 4325 9641 4295 9649 4293 9602 4324 9595 BOUSTEAD
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 10:52 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 38 min |
| Aug 11, 11:14 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 46 min |
| Aug 11, 11:32 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 43 min |
| Aug 12, 12:09 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 36 min |
| Aug 12, 12:40 AM CDT | Severe Thunderstorm Warning | FSD | Clay | 35 min |
| Aug 12, 1:08 AM CDT | Severe Thunderstorm Warning | FSD | Lyon | 37 min |
| Aug 12, 1:43 AM CDT | Severe Thunderstorm Warning | FSD | Lyon | 32 min |
| Aug 12, 2:16 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 29 min |
| Aug 12, 2:21 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 54 min |
| Aug 12, 2:25 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 50 min |
| Aug 12, 2:57 AM CDT | Severe Thunderstorm Warning | FSD | Clay | 33 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.