Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 41, NWS Des Moines, IA

June 7, 1990Polk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 7, 1990, 11:54 AM CDT for Polk County, Iowa. It was in force for 18 min.

The area

The counties it named.

The facts

Issued: Jun 7, 1990, 11:54 AM CDT (16:54 UTC)
Expired: Jun 7, 1990, 12:12 PM CDT
In force: 18 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Polk 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, 4.9 hours before the alert went out and 236 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3632 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDSM 071653
SVRDSM
IAC153-071730-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1154 AM CDT THU JUN 7 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1230 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN CENTRAL IOWA
          ...NORTHERN POLK
 
AT 1152 AM...A SEVERE THUNDERSTORM WAS INDICATED BY RADAR AND SURFACE
REPORTS MOVING INTO NORTHWEST POLK COUNTY. THE STORM WAS 15 MILES
NORTHWEST OF DES MOINES...MOVING EAST NORTHEAST AT 40 MILES AN HOUR.
 
WIND GUSTS OVER 60 MILES AN HOUR WITH LOCAL TREE AND POWER LINE DAMAGE
IS LIKELY.  THIS COVERS THE SAYLORVILLE RESERVOIR AND ANKENY.
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 CROSSIDNGS.
 
MYERS

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, Jun 7, 10:44 AM CDT, 1 hour 10 minutes before

IAZ009-012-071630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1045 AM CDT THU JUN 7 1990

...STRONG THUNDERSTORMS MOVING ACROSS SOUTHWEST IOWA...

AT 1045 AM...A SMALL LINE OF STRONG THUNDERSTORMS WERE MOVING ACROSS
SOUTHWEST IOWA.  THE LINE OF STORMS STRETCHED FROM 25 MILES EAST OF
COUNCIL BLUFFS TO JUST EAST OF SHENANDOAH...AND WAS MOVING EAST AT
25 MILES AN HOUR.

AT THIS RATE OF MOVEMENT...THE STORMS WILL ENTER CASS...ADAMS...AND
TAYLOR COUNTIES...AND THE CITIES OF ATLANTIC...CRESTON...AND BEDFORD...
BETWEEN 1045 AM AND 1130 AM.  RESIDENTS IN THESE COUNTIES SHOULD REMAIN
ALERT FOR WINDS OF 40 TO 50 MILES AN HOUR...SOME HAIL...AND EXTREMELY
HEAVY RAINS.

THESE STORMS DID PRODUCE SEVERE WEATHER AS THEY MOVED THROUGH THE
OMAHA-COUNCIL BLUFFS AREA AT AROUND 10 AM THIS MORNING.

TRUETT

Local storm report, Jun 7, 11:15 AM CDT, 39 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1115 AM CDT THU JUN 7 1990

1044 AM     HARLAN AIRPORT /SHELBY COUNTY/ WIND GUST 50 MPH

1048 AM     CLARINDA AIRPORT /PAGE COUNTY/ WIND GUST 50 MPH

MYERS

Special weather statement, Jun 7, 11:41 AM CDT, 13 minutes before

IAZALL-071730-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1140 AM CDT THU JUN 7 1990

...STRONG THUNDERSTORMS CONTINUE MOVING ACROSS SOUTHWEST IOWA...

AT 1125 AM...A LINE OF STRONG THUNDERSTORMS COTINUE TO MOVE ACROSS
SOUTHWEST INTO CENTRAL IOWA.  THE LINE OF STORMS STRETCHED FROM NEAR
AUDUBON TO THE IOWA/MISSOURI BORDER NEAR BEDFORD...OR FROM 70 MILES
WEST THROUGH 90 MILES SOUTHWEST OF DES MOINES.  THESE STORMS WERE
MOVING EAST AT 45 MILES AN HOUR.

THESE STRONG THUNDERSTORMS...HAVE BEEN PRODUCING VERY HEAVY RAINFALL
...FREQUENT DANGEROUS LIGHTNING...AND COULD PRODUCE STRONG GUSTY WIND
AND POSSIBLY SOME SMALL HAIL.  RESIDENTS IN THESE AREAS SHOULD REMAIN
ALERT FOR FOR RAPIDLY CHANGING WEATHER CONDITIONS...AND BE PREPARED
TO SEEK SHELTER IMMEDIATELY SHOULD THREATENING WEATHER APPROACH.

OVER THE REMAINDER OF WESTERN AND CENTRAL AREAS OF THE STATE...
THERE WERE NUMEROUS SHOWERS AND THUNDERSTO2RMS...ALL MOVING EAST AT
AROUND 45 MILES AN HOUR.

WPM

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 7, 11:45 AM CDT	Severe Thunderstorm Warning	DMX	Dallas	20 min
Jun 7, 12:01 PM CDT	Severe Thunderstorm Warning	DMX	Marshall, Story	23 min
Jun 7, 5:40 PM CDT	Severe Thunderstorm Warning	DMX	Davis	25 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1990 Every 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.