Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 98, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 21, 1998, 6:36 AM CDT for Taylor 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 21, 1998, 6:36 AM CDT (11:36 UTC)
- Expired
- May 21, 1998, 7:25 AM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Taylor County, IA
The radar
The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 11:36 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, 11.6 hours before the alert went out and 155 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
- 365 J/kg
- Mixed-layer CIN
- -316 J/kg
- Mixed-layer LCL
- 1026 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
626 WUUS1 KDSM 211137 RRA SVRDSM IAC173-211225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 636 AM CDT THU MAY 21 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... TAYLOR COUNTY IN SOUTHWESTERN IOWA * UNTIL 725 AM CDT * AT 634 AM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 62 MILES EAST SOUTHEAST OF OMAHA OR 6 MILES NORTH OF NEW MARKET MOVING EAST SOUTHEAST AT 30 MPH. * THIS STORM CAN BE EXPECTED NEAR... GRAVITY BY 644 AM CDT SHARPSBURG BY 650 AM CDT BEDFORD BY 653 AM CDT CLEARFIELD BY 706 AM CDT DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS GF
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 21, 6:00 AM CDT, 36 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-211500- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 600 AM CDT THU MAY 21 1998 HAZARD--SCATTERED THUNDERSTORMS CAPABLE OF PRODUCING STRONG WINDS ...LARGE HAIL AND HEAVY RAINFALL. AREA OF CONCERN AND TIMING DETAILS--SOUTHWESTERN HALF OF IOWA...ALONG AND SOUTHWEST OF A FORT DODGE TO MARSHALLTOWN TO JUST NORTH OF OTTUMWA LINE BETWEEN 300 PM CDT AND 900 PM CDT. METEOROLOGICAL COMMENTS--DAYTIME HEATING WILL CONTINUE TO DESTABILIZE THE AIRMASS OVER IOWA JUST NORTH OF A STATIONARY FRONTAL BOUNDARY DURING THE AFTERNOON AND INTO THE EVENING. UPPER AIR FIELDS FAVOR THE CONVECTION ORGANIZING INTO A BOW ECHO LINE WITH STRONG WINDS. PRECAUTIONS--SPOTTER ACTIVATION IS NOT ANTICIPATED UNTIL LATE AFTERNOON. HOWEVER...EMERGENCY MANAGERS AND SPOTTER GROUPS SHOULD KEEP ABREAST OF UPDATED CENTRAL IOWA THUNDERSTORM OUTLOOKS DURING THE DAY TODAY. FORSTER
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.