Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 53, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 12, 1990, 6:45 PM CDT for Hamilton County, Iowa. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jun 12, 1990, 6:45 PM CDT (23:45 UTC)
- Expired
- Jun 12, 1990, 7:15 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Hamilton 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 250 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
- 3648 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 244 m²/s²
- 0-3 km storm-relative helicity
- 254 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 122345
SVRDSM
IAC079-130015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
645 PM CDT TUE JUN 12 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 715 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN CENTRAL IOWA
...HAMILTON
AT 640 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM IN SOUTHEAST WEBSTER COUNTY...MOVING EAST NORTHEAST AT 45
MILES AN HOUR. THIS STORM WAS LOCATED ABOUT 15 TO 20 MILES SOUTHEAST
OF FORT DODGE...OR 30 MILES NORTHWEST OF AMES.
THE STORM WILL AFFECT THE CITY OF WEBSTER CITY...AS WELL AS
STRATFORD...STANHOPE...JEWELL...ELLSWORTH...KAMRAR...RANDALL AND
BLAIRSBURG.
THIS WARNING INCLUDES MOTORISTS ON INTERSTATE 35 BETWEEN MILES 125 AND
150.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNAwDOES
WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
DOWD/MYERS/SIECZYNSKIWhat 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, Jun 12, 5:06 PM CDT, 1 hour 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 505 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM THIS TUESDAY EVENING... AT 500 PM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS WERE LOCATED IN A 10 MILE WIDE BAND...EXTENDING FROM NEAR SUMNER...OR ABOUT 25 MILES NORTHEAST OF WATERLOO...THROUGH 15 MILES NORTHEAST OF DES MOINES. THESE STRONG THUNDERSTORMS HAVE BEEN PRODUCING BRIEF VERY HEAVY RAIN ...FREQUENT DANGEROUS LIGHTNING...AND COULD ALSO PRODUCE BRIEF STRONG GUSTY WIND...AND POSSIBLY SOME SMALL HAIL...AS THEY MOVE NORTHEAST AT 40 MILES AN HOUR. PEOPLE IN THE PATH OF THESE STRONG THUNDERSTORMS SHOULD BE PREPARED TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER APPROACH. . OVER THE REMAINDER OF NORTHEAST THROUGH CENTRAL IOWA...NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS CONTINUED ABOUT 40 MILES NORTHEAST OF WATERLOO...TO JUST NORTH OF DES MOINES. WPM/KAS
Special weather statement, Jun 12, 5:11 PM CDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT...CORRECT LAST PARAGRAPH... NATIONAL WEATHER SERVICE DES MOINES IA 505 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM THIS TUESDAY EVENING... AT 500 PM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS WERE LOCATED IN A 10 MILE WIDE BAND...EXTENDING FROM NEAR SUMNER...OR ABOUT 25 MILES NORTHEAST OF WATERLOO...THROUGH 15 MILES NORTHEAST OF DES MOINES. THESE STRONG THUNDERSTORMS HAVE BEEN PRODUCING BRIEF VERY HEAVY RAIN ...FREQUENT DANGEROUS LIGHTNING...AND COULD ALSO PRODUCE BRIEF STRONG GUSTY WIND...AND POSSIBLY SOME SMALL HAIL...AS THEY MOVE NORTHEAST AT 40 MILES AN HOUR. PEOPLE IN THE PATH OF THESE STRONG THUNDERSTORMS SHOULD BE PREPARED TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER APPROACH. . OVER THE REMAINDER OF NORTHEAST THROUGH CENTRAL IOWA...NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS CONTINUED OVER ABOUT A 40 MILE WIDE AREA...FROM 40 MILES NORTH OF WATERLOO...TO JUST NORTH OF DES MOINES. WPM/KAS
Special weather statement, Jun 12, 5:21 PM CDT, 1 hour 24 minutes before
IAZ010-222245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 520 PM CDT TUE JUN 12 1990 A TORNADO WATCH REMAINS IN EFFECT FOR A LARGE PART OF IOWA UNTIL 1000 PM CDT. STRONG THUNDERSTORMS WERE INDICATED BY RADAR AT 515 PM OVER MUCH OF MARSHALL COUNTY IN CENTRAL IOWA...OR ABOUT 50 MILES NORTHEAST OF DES MOINES. THE STORMS WERE MOVING NORTHEAST ABOUT 45 MILES AN HOUR. WIND GUSTS OF 50 MILES AN HOUR OCCURRED AT 509 PM CDT BETWEEN RHODES AND MELBOURNE IN SOUTHWEST MARSHALL COUNTY...ABOUT 35 MILES NORTHEAST OF DES MOINES. A 50 MILE AN HOUR GUST OCCURRED AT 515 AT MARSHALLTOWN ...ABOUT 50 MILES NORTHEAST OF DES MOINES. JUST NORTH OF MARSHALLTOWN ...A RADIO STATION REPORTED A 56 MILE AN HOUR GUST...AGAIN AT 515 PM CDT. BIKLE
Special weather statement, Jun 12, 5:45 PM CDT, 1 hour before
IAZALL-122340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM THIS TUESDAY EVENING... AT 532 PM CDT...SCATTERED STRONG THUNDERSTORMS WERE LOCATED IN A 15 MILE WIDE BAND...EXTENDING FROM NEAR WEST BRANCH...OR ABOUT 40 MILES NORTHEAST OF WATERLOO...TOROUGH ABOUT 20 MILES SOUTHWEST OF MARSHALLTOWN...OR ABOUT 35 MILES NORTHWEST OF DES MOINES. THESE STRONG THUNDERSTORMS HAVE BEEN PRODUCING BRIEF VERY HEAVY RAIN ...FREQUENT DANGEROUS LIGHTNING...AND HAVE ALSO PRODUCED BRIEF STRONG GUSTY WIND...AND COULD PRODUCE SOME SMALL HAIL...AS THEY MOVE NORTHEAST AT 40 MILES AN HOUR. PEOPLE IN THE PATH OF THESE STRONG THUNDERSTORMS SHOULD BE PREPARED TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER APPROACH. OVER THE REMAINDER OF NORTHEAST THROUGH CENTRAL IOWA...NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS CONTI NUED OVER ABOUT A 50 MILE WIDE AREA...FROM 50 MILES NORTH OF WATERLOO...TO ABOUT 20 MILES NORTHEAST OF DES MOINES. WPM/KAS
Special weather statement, Jun 12, 5:53 PM CDT, 52 minutes before
IAZALL-122340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...LINE 2 FIRST PARA.. NATIONAL WEATHER SERVICE DES MOINES IA 545 PM CDT TUE JUN 12 1990 ...A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF IOWA UNTIL 10 PM THIS TUESDAY EVENING... AT 532 PM CDT...SCATTERED STRONG THUNDERSTORMS WERE LOCATED IN A 15 MILE WIDE BAND...EXTENDING FROM NEAR WEST UNION...OR ABOUT 40 MILES NORTHEAST OF WATERLOO...THROUGH ABOUT 20 MILES SOUTHWEST OF MARSHALLTOWN...OR ABOUT 35 MILES NORTHWEST OF DES MOINES. THESE STRONG THUNDERSTORMS HAVE BEEN PRODUCING BRIEF VERY HEAVY RAIN ...FREQUENT DANGEROUS LIGHTNING...AND HAVE ALSO PRODUCED BRIEF STRONG GUSTY WIND...AND COULD PRODUCE SOME SMALL HAIL...AS THEY MOVE NORTHEAST AT 40 MILES AN HOUR. PEOPLE IN THE PATH OF THESE STRONG THUNDERSTORMS SHOULD BE PREPARED TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER APPROACH. OVER THE REMAINDER OF NORTHEAST THROUGH CENTRAL IOWA...NUMEROUS SHOWERS AND SCAT2TERED THUNDERSTORMS CONTINUED OVER ABOUT A 50 MILE WIDE AREA...FROM 50 MILES NORTHEAST OF WATERLOO...TO ABOUT 20 MILES NORTHEAST OF DES MOINES. WPM
Special weather statement, Jun 12, 6:24 PM CDT, 21 minutes before
IA002-003-007-130200 SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA 615 PM CDT TUE JUN 12 1990 ...TORNADO WATCH FOR NORTHEAST IOWA UNTIL 1000 PM CDT... AT 615 PM CDT SHOWERS AND THUNDERSTORMS CONTINUED TO MOVE NORTHEAST ACROSS NORTHEAST IOWA AT 40 MILES AN HOUR. THE TRAILING EDGE OF THE PRECIPITATION WAS FROM THE NORTHEAST CORNER OF IOWA TO NEAR DECORAH TO JUST WEST OF WATERLOO. TO THE WEST OF THE PRECIPITATION THE SUN WAS OCCASIONALLY PEEKING THROUGH THE CLOUDS. TEMPERATURES WERE IN THE UPPER 70S TO MIDDLE 80S AND THE WINDS WERE FROM SOUTHWEST 25 TO 40 MPH. THE SHOWERS AND THUNDERSTORMS WILL CONTINUE THEIR NORTHEAST MOVEMENT WITH THE HEAVIEST RAIN ENTERING THE INDEPENDENCE AREA BY 645 PM. SKIES WILL REMAIN CLOUDY FOR THE MOST PART AND TEMPERATURES WILL REMAIN NEARLY STEADY IN THE LOWER 80S EXCEPT IN THE RAIN AREAS WHERE THEY MIGHT DROP INTO THE 70S. WINDS WILL CONTINUE FROM THaE SOUTHWEST 25 TO 35 MILES AN HOUR.
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 3:44 PM CDT | Tornado Warning | DMX | Adair | 22 min |
| Jun 12, 4:02 PM CDT | Severe Thunderstorm Warning | DMX | Dallas | 22 min |
| Jun 12, 5:06 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 39 min |
| Jun 12, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Chickasaw | 42 min |
| Jun 12, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Fayette | 27 min |
| Jun 12, 6:06 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 19 min |
| Jun 12, 6:16 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Webster | 44 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.