Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 161, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 1990, 11:44 PM CDT for Story County, Iowa. It was in force for 31 min.
The area
The counties it named.
The facts
- Issued
- Aug 9, 1990, 11:44 PM CDT (04:44 UTC)
- Expired
- Aug 10, 1990, 12:15 AM CDT
- In force
- 31 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Story 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 00:00Z, 4.7 hours before the alert went out and 254 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
- 3582 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 74 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 100445
SVRDSM
IAC169-100515-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1144 PM CDT THU AUG 9 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN CENTRAL IOWA
...STORY
AT 1140 PM...A SEVERE THUNDERSTORM WAS INDICATED IN THE AMES
AREA...ABOUT 30 MILES NORTH OF DES MOINES.
THE STORM WAS MOVING SOUTH AT 20 MILES AN HOUR...AND WILL BE AFFECTING
AMES...HUXLEY...NEVADA...AND CAMBRIDGE.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOU R PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
TRUETTWhat 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 9, 9:15 PM CDT, 2 hours 29 minutes before
IAZ002-003-007-080300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 910 PM CDT THU AUG 8 1990 AT 905 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE WIDE BAND FROM 5 MILES NORTH OF HAMPTON TO DECORAH. THE STRONGEST STORMS WERE IN SOUTHEAST CERRO GORDO COUNTY NEAR THE TOWN OF DOUGHERTY AND SOUTHERN FLOYD COUNTY BETWEEN MARBLE ROCK AND CHARLES CITY. THESE STORMS WILL PRODUCE HEAVY RAINS...DEADLY LIGHTNING...AND SOME SMALL HAIL. THESE STORMS WERE MOVING TO THE SOUTH AT 20 MILES AN HOUR. THESE STORMS WILL CONTINUE TO MOVE SOUTH INTO FRANKLIN AND BUTLER COUNTIES AND AFFECT THE CITIES OF HAMPTON...SHEFFIELD...CLARKSVILLE AND GREENE. PEOPLE SHOULD BE ALERT FOR TMHREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF IN THE PATH OF THESE STORMS. COLLAR
Special weather statement, Aug 9, 10:06 PM CDT, 1 hour 38 minutes before
IAZ002-003-007-100400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1005 PM CDT THU AUG 9 1990 AT 955 PM CDT SHOWERS AND THUNDERSTORMS WERE OCCURRING IN A 25 MILE WIDE BAND FROM 5 MILES NORTH OF GRUNDY CENTER THROUGH NEW HARTFORD TO 10 MILES NORTHEAST OF WAVERLY. THESE STORMS WILL PRODUCE HEAVY RAINS ...DEADLY LIGHTNING...AND POSSIBLY SOME SMALL HAIL. THE STORMS WERE MOVING TO THE SOUTH AT 20 TO 25 MILES AN HOUR. THESE STORMS WILL CONTINUE TO MOVE THROUGH GRUNDY AND BLACK HAWK COUNTY AND AFFECT THE CITIES OF WATERLOO...CEDAR FALLS..AND THE GRUNDY CENTER AREA BETWEEN 1000 AND 1100 PM CDT. PEOPLE SHOULD BE ALERT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF IN THE PATH OF THESE STORMS. COLLAR
Special weather statement, Aug 9, 11:42 PM CDT, 2 minutes before
IAZALL-100531- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1135 PM CDT THU AUG 9 1990 STRONG THUNDERSTORMS HAVE MOVED INTO CENTRAL IOWA. AT 1125 PM...A NARROW BAND OF THUNDERSTORMS WITH EXTREMELY HEAVY RAINS AND SMALL HAIL EXTENDED FROM STORY CITY...NORTH OF AMES TO MARSHALLTOWN...NORTHEAST OF DES MOINES. WINDS OF 35 TO 45 MILES AN HOUR WERE ALSO OCCURRING WITH THESE STORMS. THE STORMS WERE MOVING SOUTH AT 25 MILES AN HOUR. BY 1230 AM THESE STORMS WILL STRETCH FROM SAYLORVILLE LAKE NORTH OF DES MOINES THROUGH NEWTON TO NEAR MONTEZUMA...55 MILES EAST OF DES MOINES. OTHER SHOWERS AND SCATTERED THUNDERSTORMS WERE OVER EAST CENTRAL IOWA FROM WEST OF CEDAR RAPIDS NEAR TOLEDO AND BROOKLYN TO CEDAR RAPIDS. THESE SHOWERS AND THUNDERSTORMS WERE ALSO MOVING SOUTH AT 25 MILES AN HOUR. DLF
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 10:11 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 34 min |
| Aug 10, 12:49 AM CDT | Severe Thunderstorm Warning | DMX | Boone | 34 min |
| Aug 10, 12:49 AM CDT | Severe Thunderstorm Warning | DMX | Dallas | 41 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.