Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 162, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 10, 1990, 12:49 AM CDT for Boone County, Iowa. It was in force for 34 min.
The area
The counties it named.
The facts
- Issued
- Aug 10, 1990, 12:49 AM CDT (05:49 UTC)
- Expired
- Aug 10, 1990, 1:23 AM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Boone 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, 5.8 hours before the alert went out and 218 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 100550
SVRDSM
IAC015-049-100630-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1249 AM CDT FRI AUG 10 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 130 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL IOWA
...SOUTHWESTERN BOONE...DALLAS
AT 1245 AM...WEATHER RADAR INDICATED A SEVERE THUNDERSTORM OVER
SOUTHWEST BOONE COUNTY...JUST SOUTHWEST OF OGDEN...OR ABOUT 40
MILES NORTHWEST OF DES MOINES.
THE STORM WAS MOVING SOUTH AT 25 MILES AN HOUR...AND WILL BE AFFECTING
THE CITIES OF BERKLEY...PERRY...DAWSON...WOODWARD...AND MINBURN.
WHEN THUNDERSTORMSs ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.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 9, 9:15 PM CDT, 3 hours 34 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, 2 hours 43 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, 1 hour 7 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
Special weather statement, Aug 10, 12:18 AM CDT, 31 minutes before
IAZ010-100630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1215 AM CDT FRI AUG 10 1990 ...STRONG THUNDERSTORMS MOVING THROUGH CENTRAL IOWA... AT 1215 AM...STRONG THUNDERSTORMS WERE MOVING THROUGH CENTRAL IOWA. THE LEADING EDGE OF THE STORMS EXTENDED FROM JUST SOUTH OF BOONE... ABOUT 30 MILES NORTHWEST OF DES MOINES...TO NEAR SAYLORVILLE LAKE... 10 MILES NORTH OF DES MOINES...TO NEAR PELLA...30 MILES SOUTHEAST OF DES MOINES. THE STORMS WERE MOVING SOUTH AT 25 MILES AN HOUR...AND WILL REACH THE DES MOINES AREA BETWEEN 1230 AM AND 1 AM. FREQUENT DANGEROUS LIGHTNING...AND EXTREMELY HEAVY RAINS OF UP TO AN INCH IN AN HOUR CAN BE EXPECTED WITH THE STORMS PASSAGE. SOME JSMALL HAIL...AND WINDS OF 30 TO 40 MILES AN HOUR...ARE ALSO POSSIBLE. TRUETT
Special weather statement, Aug 10, 12:37 AM CDT, 12 minutes before
IAZALL-100630- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1235 AM CDT FRI AUG 10 1990 AT 1235 AM...STRONG THUNDERSTORMS CONTINUED OVER CENTRAL IOWA. THE LEADING EDGE OF THE STORMS EXTENDED FROM ABOUT 50 MILES NORTHWEST OF DES MOINES NEAR BOONE...TO DES MOINES...TO 30 MILES SOUTHEAST OF DES MOINES NEAR PELLA. THE STORMS WERE MOVING SOUTH AT 25 MILES AN HOUR...AND WILL PRODUCE FREQUENT LIGHTNING...AND UP TO AN INCH OF RAIN. WINDS OF 30 TO 40 MILES AN HOUR...AND SOME SMALL HAIL...IS ALSO POSSIBLE. OTHER SHOWERS WERE OVER EAST CENTRAL AND SOUTHEAST IOWA...BETWEEN CEDAR RAPIDS AND OTTUMWA. THESE SHOWERS WERE ALSO MOVING SOUTH AT 25 MILES AN HOUR. b FERRY/TRUETT
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 9, 11:44 PM CDT | Severe Thunderstorm Warning | DMX | Story | 31 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.