Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 90, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 20, 1998, 4:31 AM CDT for Carroll 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 counties it named.
The facts
- Issued
- May 20, 1998, 4:31 AM CDT (09:31 UTC)
- Expired
- May 20, 1998, 5:20 AM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Carroll County, IA
The radar
The Des Moines radar (KDMX), 100 km from the middle of the area, began a volume at 09:31 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 |
|---|---|---|---|
| May 20, 1:45 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 9.5 hours before the alert went out and 148 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
- 2454 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1962 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.4
The text
As transmitted, in the capitals the NWS used until 2016.
557 WUUS1 KDSM 200932 RRA SVRDSM IAC027-201020- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 431 AM CDT WED MAY 20 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CARROLL COUNTY IN WEST CENTRAL IOWA * UNTIL 520 AM CDT * AT 429 AM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 60 MILES NORTHEAST OF OMAHA OR 6 MILES WEST NORTHWEST OF MANNING MOVING EAST NORTHEAST AT 35 MPH. * THIS STORM CAN BE EXPECTED NEAR... MANNING BY 434 AM CDT ARCADIA BY 439 AM CDT TEMPLETON BY 443 AM CDT HALBUR BY 444 AM CDT CARROLL BY 455 AM CDT DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS COGIL
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:23 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 47 min |
| May 19, 7:31 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 34 min |
| May 19, 7:59 PM CDT | Severe Thunderstorm Warning | DMX | Lucas | 36 min |
| May 20, 3:46 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 49 min |
| May 20, 3:53 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 62 min |
| May 20, 5:20 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 60 min |
| May 20, 5:47 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion | 48 min |
| May 20, 10:19 AM CDT | Severe Thunderstorm Warning | DMX | Marion | 36 min |
| May 20, 10:21 AM CDT | Severe Thunderstorm Warning | DMX | Marion | 34 min |
| May 20, 10:50 AM CDT | Severe Thunderstorm Warning | DMX | Monroe | 35 min |
| May 20, 11:05 AM CDT | Severe Thunderstorm Warning | DMX | Wapello | 35 min |
| May 20, 11:45 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 20 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning in 1998
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.