Severe Thunderstorm Warning 177, NWS Des Moines, IA

Issued

Aug 29, 1990, 12:20 AM CDT (05:20 UTC)

Expired

Aug 29, 1990, 1:00 AM CDT

In force

40 min

Issued by

NWS Des Moines, IA

Area

Whole counties

Counties Mahaska County, IA, Marion County, IA

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

000 
TTAA00 KDSM 290522
SVRDSM
IAC125-123-290600-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1220 AM CDT WED AUG 29 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL IOWA
          ...EASTERN MARION AND WESTERN MAHASKA
 
AT 1215 AM...WEATHER RADAR INDICATED A SEVERE THUNDERSTORM OVER RED
ROCK RESERVOIR...OR ABOUT 35 MILES SOUTHEAST OF DES MOINES.
 
THE STORM WAS MOVING EAST SOUTHEAST AT 15 MILES AN HOUR AND WILL
AFFECT THE COMMUNITIES OF HARVEY AND PELLA...LIGHTON AND EVANS.
 
THE MAIN THREAT OF THIS STORM IS LARGE HAIL AND INTENSE RAINFALL WITH
DEADLY LIGHTNING.
 
WHEN THUNDERSTORMS 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.
 
MYERS

In the hours before

IAZ011-290450-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1120 PM CDT TUE AUG 28 1990

THUNDERSTORMS WITH INTENSE RAIN AND LIGHTNING HAVE ERUPTED IN A VERY
SHORT PERIOD OF TIME OVER EASTERN IOWA.  THE STORMS EXTENDED FROM THE
MUSCATINE AREA...50 MILES SOUTHEAST OF CEDAR RAPIDS...WEST THROUGH
PARTS OF WASHINGTON...KEOKUK AND SOUTHERN IOWA COUNTIES.

MOST INTENSE OF THESE STORMS WERE JUST NORTHWEST OF MUSCATINE AND JUST
NORTH OF KEOTA...WHICH IS 35 MILES NORTHEAST OF OTTUMWA.

THESE STORMS WILL LAY DOWN INTENSE RAIN...DANGEROUS LIGHTNING AND
MARBLE-SIZED HAIL WITH WIND GUSTS OF 40 TO 50 MILES AN HOUR.  THE
STORMS WERE MOVING EAST SOUTHEAST AT 15 MILES AN HOUR...AS MOREm
STORMS BUILT BACK WESTWARD.

MYERS

IAZALL-290530-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1143 PM CDT TUE AUG 28 1990

AT 1135 PM...A 30 MILE WIDE BAND OF SCATTERED SHOWERS AND INTENSE
THUNDERSTORMS HAD DEVELOPED RAPIDLY FROM 30 MILE SOUTHEAST OF
DES MOINES NEAR PELLA EAST TO ABOUT 5 MILES SOUTHWEST OF THE
QUAD CITIES.

THE STRONGEST STORMS WERE LOCATED 35 MILES SOUTHWEST OF THE QUAD CITIES
...NEAR WAPELLO AND 30 MILES NORTHEAST OF OTTUMWA...NEAR WASHINGTON.

THESE STORMS WILL PRODUCE MARBLE SIZED HAIL...VERY HEAVY RAIN AND NEARLY
CONTINUOUS DEADLY LIGHTNING.

EXACT MOVEMENT OF THE STORMS HAD NOT YET BEEN DETERMINED.

BARLOW

Severe Thunderstorm Warnings in Iowa, 1990Every severe thunderstorm warning in 1990

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.