Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 46, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 8, 1990, 2:33 AM CDT for Keokuk County, Mahaska County, Iowa. It was in force for 42 min.
The area
The counties it named.
The facts
- Issued
- Jun 8, 1990, 2:33 AM CDT (07:33 UTC)
- Expired
- Jun 8, 1990, 3:15 AM CDT
- In force
- 42 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Keokuk County, IA, Mahaska 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, 7.6 hours before the alert went out and 331 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
- 3632 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 158 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 080733
SVRDSM
IAC107-123-080815-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
233 AM CDT FRI JUN 8 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 315 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE SOUTHEAST PART OF IOWA
WESTERN KEOKUK...
IN THE SOUTH CENTRAL PART OF IOWA
EASTERN MAHASKA...
AT 230 AM CDT...WEATHER RADAR INDICATED A SEVERE THUNDERSTORM
NEAR WHAT CHEER OR 30 MILES NORTH OF OTTUMWA IN SOUTH CENTRAL
IOWA. THE STORM WAS MOVING SOUTHEAST AT 30 MILES AN HOUR.
PEOPLE IN THE TOWNS OF WHAT CHEER...OSKALOOSA...AND DELTA AND
NEARBY COMMUNITIES SHOULD BE ON THE LOOKOUT.
REMEMBER...SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 60 MILES
AN HOUR...LARGE HAIL...DANGEROUS LIGHTNING...AND VERY HEAVY RAINS.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOU HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
IN ADDITION...THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCED WARNING SO BE ON THE LOOKOUT.
MCQUIRTERWhat 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 8, 1:42 AM CDT, 51 minutes before
IAZALL-080730- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 140 AM CDT FRI JUN 8 1990 AT 131 AM CDT...SCATTERED INTENSE AND VERY STRONG THUNDERSTORMS WERE OCCURRING OVER SOUTH CENTRAL AND EAST CENTRAL IOWA. THE STRONGEST STORMS ARE LOCATED NEAR GRINNELL...50 MILES NORTHEAST OF DES MOINES...AND 20 TO 30 MILES SOUTHWEST OF CEDAR RAPIDS...NEAR WILLIAMSBURG. THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALLq AND ARE CAPABLE OF PRODUCING SMALL HAIL AND STRONG WIND. THE THUNDERSTORMS ARE MOVING EAST AT 25 MILES AN HOUR. ALSO...ISOLATED SHOWERS AND THUNDERSHOWERS WERE OVER THE EXTREME SOUTHEAST COUNTIES OF IOWA. DM
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 1:26 AM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 24 min |
| Jun 8, 2:07 AM CDT | Severe Thunderstorm Warning | DMX | Iowa, Poweshiek | 53 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.