Alert archive / Iowa / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 178, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 12, 2002, 11:11 PM CDT for Black Hawk County, Bremer County, Iowa. It was in force for 49 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, 11:11 PM CDT (04:11 UTC)
- Expired
- Aug 13, 2002, 12:00 AM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
Counties Black Hawk County, IA, Bremer County, IA
The radar
The La Crosse radar (KARX), 153 km from the middle of the area, began a volume at 04:13 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
Davenport, (KDVN), launched 00:00Z, 4.2 hours before the alert went out and 198 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
- 2564 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 939 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
738 WUUS53 KDMX 130411 SVRDSM IAC013-017-130500- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1111 PM CDT MON AUG 12 2002 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN BLACK HAWK COUNTY IN NORTHEAST IOWA BREMER COUNTY IN NORTHEAST IOWA * UNTIL MIDNIGHT CDT * AT 1108 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES WEST OF JANESVILLE...OR ABOUT 14 MILES NORTHWEST OF WATERLOO...MOVING EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE... NEAR JANESVILLE AROUND 1115 PM... 4 MILES SOUTH OF WAVERLY AROUND 1120 PM... NEAR DENVER AROUND 1130 PM... NEAR READLYN AROUND 1145 PM... 6 MILES SOUTH OF TRIPOLI AROUND 1150 PM AND 7 MILES SOUTH OF SUMNER AROUND MIDNIGHT. DAMAGING WINDS OF 60 TO 70 MILES AN HOUR ARE LIKELY IN THE WARNED AREA. LAT...LON 4288 9255 4253 9255 4253 9209 4291 9206 KINNEY
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:57 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 33 min |
| Aug 12, 9:24 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Union | 51 min |
| Aug 12, 9:29 PM CDT | Severe Thunderstorm Warning | DMX | Adams | 21 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.