Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 171, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 24, 1990, 6:48 PM CDT for Davis County, Iowa. It was in force for 42 min.
The area
The counties it named.
The facts
- Issued
- Aug 24, 1990, 6:48 PM CDT (23:48 UTC)
- Expired
- Aug 24, 1990, 7:30 PM CDT
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Davis County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 338 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
- 3633 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Aug 24, 4:47 PM CDT, 2 hours 1 minute before
IAZALL-242230- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 445 PM CDT FRI AUG 24 1990 AT 433 PM...VERY STRONG THUNDERSTORMS WERE INDICATED IN PARTS OF CENTRAL AND SOUTHEAST IOWA. THE VERY STRONG STORMS WERE 15 MILES NORTHWEST OF DES MOINES...JUST EAST OF KNOXVILLE AND JUST SOUTH OF MONTEZUMA. VERY HEAVY RAIN...SMALL HAIL AND WIND TO 50 MILES AN HOUR ARE POSSIBLE WITH THE STRONGER STORMS. A STRONG THUNDERSTORM PRODUCED 1.27 INCHES OF RAIN IN 15 MINUTES IN ADEL...ABOUT 20 MILES WEST OF DES MOINES...SHORTLY AFTER 4PM. OTHER SCATTERED SHOWERS AND THUNDERSTORMS WERE NORTH OF A LINE FROM 10 MILES SOUTH OF SIOUX CITY...THROUGH DES MOINES TO OTTUMWA. THE AREA OF PRECIPITATION WAS WEST OF A LINE FROM OTTUMWA...THROUGH WATERLOO TO THE IOWA BORDER NORTH OF WATERLOO. THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 25 TO 30 MILES AN HOUR. HUTTON
Special weather statement, Aug 24, 4:52 PM CDT, 1 hour 56 minutes before
IAZALL-242230- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 445 PM CDT FRI AUG 24 1990 ...SEVERE THUNDERSTORM WATCH SOUTH HALF OF IOWA UNTIL 10PM... AT 433 PM...VERY STRONG THUNDERSTORMS WERE INDICATED IN PARTS OF CENTRAL AND SOUTHEAST IOWA. THE VERY STRONG STORMS WERE 15 MILES NORTHWEST OF DES MOINES...JUST EAST OF KNOXVILLE AND JUST SOUTH OF MONTEZUMA. VERY HEAVY RAIN...SMALL HAIL AND WIND TO 50 MILES AN HOUR ARE POSSIBLE WITH THE STRONGER STORMS. A STRONG THUNDERSTORM PRODUCED 1.27 INCHES OF RAIN IN 15 MINUTES IN ADEL...ABOUT 20 MILES WEST OF DES MOINES...SHORTLY AFTER 4PM. OTHER SCATTERED SHOWERS AND THUNDERSTORMS WERE NORTH OF A LINE FROM 10 MILES SOUTH OF SIOUX CITY...THROUGH DES MOINES TO OTTUMWA. THE AREA OF PRECIPITATION WAS WEST OF A LINE FROM OTTUMWA...THROUGH WATERLOO TO THE IOWA BORDER NORTH OF WATERLOO. THE SHOWERS AND THUNDESTORMS WERE MOVING NORTHEAST AT 25 TO 30 MILES AN HOUR. HUTTON
Special weather statement, Aug 24, 5:12 PM CDT, 1 hour 36 minutes before
IAZALL-242300- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA NATIONAL WEATHER SERVICE DES MOINES IA 511 PM CDT FRI AUG 24 1990 ...SEVERE THUNDERSTORM WATCH SOUTH HALF OF IOWA UNTIL 10PM... AT 510 PM...VERY STRONG THUNDERSTORMS WERE INDICATED IN PARTS OF CENTRAL AND SOUTHEAST IOWA. THE STORMS WERE JUST NORTHEAST OF NEWTON...JUST NORTHEAST OF MONTEZUMA AND 5 TO 10 MILES NORTH OF OTTUMWA. VERY HEAVY RAIN...SMALL HAIL...GUSTY WIND TO 50 MILES AN HOUR ALONG WITH DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED. IN ADDITION...STREET FLOODING AND FLOODING OF LOW AREAS IS LIKELY. OTHER SCATTERED SHOWERS AND THUNDERSTORMS WERE IN PART OF NORTHWEST... NORTHEAST AND EAST CENTRAL IOWA....MAINLY FROM 15 MILES NORTHEAST OF DES MOINES TO OTTUMWA...AND FROM 30 MILES SOUTHWEST TO 20 MILES NORTH OF WATERLOO. THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR. HUTTON
Special weather statement, Aug 24, 5:49 PM CDT, 59 minutes before
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</html>Special weather statement, Aug 24, 6:16 PM CDT, 32 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 11:06 PM CDT | Severe Thunderstorm Warning | DMX | Clay | 39 min |
| Aug 24, 3:47 PM CDT | Tornado Warning | DMX | Clay, Palo Alto | 28 min |
| Aug 24, 5:20 PM CDT | Severe Thunderstorm Warning | DMX | Jones | 40 min |
| Aug 24, 5:20 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 40 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1990Every severe thunderstorm warning in 1990
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.