Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 34, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 25, 1998, 7:26 PM CDT for Greene County, Iowa. It was in force for 34 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
- Apr 25, 1998, 7:26 PM CDT (00:26 UTC)
- Expired
- Apr 25, 1998, 8:00 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Greene County, IA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 25, 5:30 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 25, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.4 hours before the alert went out and 182 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
- 892 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
536 WUUS1 KDSM 260027 RRA SVRDSM IAC073-260100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 726 PM CDT SAT APR 25 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GREENE COUNTY IN WEST CENTRAL IOWA * UNTIL 800 PM CDT * AT 725 PM CDT... STORM SPOTTERS REPORTED A SEVERE THUNDERSTORM 33 MILES SOUTH SOUTHWEST OF FORT DODGE OR 4 MILES SOUTHEAST OF FARLIN MOVING NORTH AT 25 MPH. * THIS STORM CAN BE EXPECTED NEAR... FARLIN BY 725 PM CDT CHURDAN BY 739 PM CDT GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. BB
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, Apr 25, 1:45 PM CDT, 5 hours 41 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-261100- CENTRAL IOWA THUNDERSTORM OUTLOOK...UPDATE NATIONAL WEATHER SERVICE DES MOINES IA 145 PM CDT SAT APR 25 1998 HAZARD--THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS. SOME STORMS COULD HAVE HEAVY RAIN. AREA OF CONCERN--THUNDERSTORMS ARE POSSIBLE ACROSS ALL OF CENTRAL IOWA BUT THE LIKELIHOOD OF SEVERE WEATHER WILL PRIMARILY BE SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. TIMING--THUNDERSTORMS WILL REDEVELOP AFTER 4 PM BUT THE BEST TIME FOR SEVERE WEATHER WILL BE BETWEEN 5 TO 10 PM. METEOROLOGICAL COMMENTS--LOW PRESSURE OVER THE EASTERN KANSAS/NEBRASKA BORDER IS CONTINUING TO CREEP EAST. SUFFICIENT HEATING IS OCCURRING OVER SOUTHWEST IOWA AS MOISTURE CONTINUES TO STREAM NORTHWARD. THE MOISTURE IS IN A FAIRLY NARROW BAND ALONG AND NORTH OF A SURFACE WARM FRONT STRETCHED ACROSS NORTHERN MISSOURI. AS COLDER AIR WRAPS AROUND AROUND THE LOW AT 700 MB THE THREAT FOR SEVERE THUNDERSTORMS WILL INCREASE. AT THIS TIME IT APPEARS THE BEST TIME FOR SEVERE WEATHER WILL BE DURING THE EARLY EVENING HOURS. PRECAUTIONS--EMERGENCY MANAGERS MAY WANT TO ALERT THEIR COUNTY SPOTTERS TO THE LIKELIHOOD OF THUNDERSTORMS FOR THE AFTERNOON AND THE POSSIBILITY SEVERE STORMS AFTER 5 PM. THE BEST CHANCE FOR SEVERE WEATHER WILL BE ALONG AND SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. KEEP AN EYE TO THE SKY FOR THE DEVELOPMENT OF THUNDERSTORMS THIS AFTERNOON AND BE PREPARED TO ACT QUICKLY. FAB
Special weather statement, Apr 25, 4:00 PM CDT, 3 hours 26 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-261100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 400 PM CDT SAT APR 25 1998 HAZARD--THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS. AREA OF CONCERN--THUNDERSTORMS ARE POSSIBLE ACROSS ALL OF CENTRAL IOWA BUT THE LIKELIHOOD OF SEVERE WEATHER WILL PRIMARILY BE SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. TIMING--THUNDERSTORMS WILL REDEVELOP AFTER 5 PM BUT THE BEST TIME FOR SEVERE WEATHER WILL BE BETWEEN 6 TO 9 PM. METEOROLOGICAL COMMENTS--LOW PRESSURE OVER THE EASTERN KANSAS/NEBRASKA BORDER IS CONTINUING TO CREEP EAST. A CAP AT 700 MB IS PREVENTING CONVECTION FROM STARTING HOWEVER THIS CAP IS EXPECTED TO ERODE AWAY AS COLDER AIR ALOFT WRAPS INTO THE LOW IN EASTERN NEBRASKA. THE CAP IS EXPECTED TO BREAK EARLY THIS EVENING AND IF IT DOES...THUNDERSTORMS WILL ERUPT. THESE STORMS HAVE THE POTENTIAL FOR LARGE HAIL AND DAMAGING WIND. AT THIS TIME ONLY A COUPLE THUNDERSTORMS ARE BEING PICKED UP BY RADAR BUT THEY ARE WEAK. WIDESPREAD THUNDERSTORM DEVELOPMENT IS NOT EXPECTED UNTIL AFTER 5 PM WITH THE POTENTIAL FOR SEVERE STORMS AFTER 6 PM. PRECAUTIONS--EMERGENCY MANAGERS MAY WANT TO ALERT THEIR COUNTY SPOTTERS TO THE LIKELIHOOD OF THUNDERSTORMS FOR THE AFTERNOON AND THE POSSIBILITY SEVERE STORMS AFTER 5 PM. THE BEST CHANCE FOR SEVERE WEATHER WILL BE ALONG AND SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. KEEP AN EYE TO THE SKY FOR THE DEVELOPMENT OF THUNDERSTORMS THIS AFTERNOON AND BE PREPARED TO ACT QUICKLY. FAB
Special weather statement, Apr 25, 4:00 PM CDT, 3 hours 26 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-261100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 400 PM CDT SAT APR 25 1998 HAZARD--THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS. AREA OF CONCERN--THUNDERSTORMS ARE POSSIBLE ACROSS ALL OF CENTRAL IOWA BUT THE LIKELIHOOD OF SEVERE WEATHER WILL PRIMARILY BE SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. TIMING--THUNDERSTORMS WILL REDEVELOP AFTER 5 PM BUT THE BEST TIME FOR SEVERE WEATHER WILL BE BETWEEN 6 TO 9 PM. METEOROLOGICAL COMMENTS--LOW PRESSURE OVER THE EASTERN KANSAS/NEBRASKA BORDER IS CONTINUING TO CREEP EAST. A CAP AT 700 MB IS PREVENTING CONVECTION FROM STARTING HOWEVER THIS CAP IS EXPECTED TO ERODE AWAY AS COLDER AIR ALOFT WRAPS INTO THE LOW IN EASTERN NEBRASKA. THE CAP IS EXPECTED TO BREAK EARLY THIS EVENING AND IF IT DOES...THUNDERSTORMS WILL ERUPT. THESE STORMS HAVE THE POTENTIAL FOR LARGE HAIL AND DAMAGING WIND. AT THIS TIME ONLY A COUPLE THUNDERSTORMS ARE BEING PICKED UP BY RADAR BUT THEY ARE WEAK. WIDESPREAD THUNDERSTORM DEVELOPMENT IS NOT EXPECTED UNTIL AFTER 5 PM WITH THE POTENTIAL FOR SEVERE STORMS AFTER 6 PM. PRECAUTIONS--EMERGENCY MANAGERS MAY WANT TO ALERT THEIR COUNTY SPOTTERS TO THE LIKELIHOOD OF THUNDERSTORMS FOR THE AFTERNOON AND THE POSSIBILITY SEVERE STORMS AFTER 5 PM. THE BEST CHANCE FOR SEVERE WEATHER WILL BE ALONG AND SOUTH OF HIGHWAY 92 AND WEST OF HIGHWAY 169. KEEP AN EYE TO THE SKY FOR THE DEVELOPMENT OF THUNDERSTORMS THIS AFTERNOON AND BE PREPARED TO ACT QUICKLY. FAB
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:07 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 33 min |
| Apr 25, 7:39 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 36 min |
| Apr 25, 7:42 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 33 min |
| Apr 25, 8:10 PM CDT | Severe Thunderstorm Warning | DMX | Greene, Webster | 35 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.