Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 113, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 23, 1998, 11:39 AM CDT for Cerro Gordo County, Iowa. It was in force for 31 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
- May 23, 1998, 11:39 AM CDT (16:39 UTC)
- Expired
- May 23, 1998, 12:10 PM CDT
- In force
- 31 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Cerro Gordo County, IA
The radar
The Des Moines radar (KDMX), 155 km from the middle of the area, began a volume at 16:43 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 23, 11:45 AM CDT | Hail 1 | Mason City, IA | |
| May 23, 11:47 AM CDT | Hail 0.75 | Mason City, IA |
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 nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 4.7 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1111 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 231639 RRA SVRDSM IAC033-231710- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1139 AM CDT SAT MAY 23 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CERRO GORDO COUNTY IN NORTH CENTRAL IOWA * UNTIL 1210 PM CDT * AT 1137 AM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES WEST OF MASON CITY MOVING EAST AT 30 MPH. * THIS STORM CAN BE EXPECTED NEAR... MASON CITY NOW PLYMOUTH BY 1144 AM CDT PORTLAND BY 1144 AM CDT ROCK FALLS BY 1148 AM CDT DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! HAIL WAS OCCURRING AT CLEAR LAKE. KULA/MYERS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 3:54 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Webster | 31 min |
| May 23, 4:00 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 35 min |
| May 23, 6:03 PM CDT | Severe Thunderstorm Warning | DMX | Audubon | 32 min |
| May 23, 6:14 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 31 min |
| May 23, 6:47 PM CDT | Severe Thunderstorm Warning | DMX | Greene, Webster | 33 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.