Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 42, NWS Des Moines, IA

June 7, 1990Marshall County, Story County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 7, 1990, 12:01 PM CDT for Marshall County, Story County, Iowa. It was in force for 23 min.

The area

The counties it named.

The facts

Issued
Jun 7, 1990, 12:01 PM CDT (17:01 UTC)
Expired
Jun 7, 1990, 12:24 PM CDT
In force
23 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Marshall County, IA, Story 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, 5.0 hours before the alert went out and 272 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1990-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 1990-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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 071701
SVRDSM
IAC127-169-071745-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1201 PM CDT THU JUN 7 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN CENTRAL IOWA
          ...WESTERN MARSHALL...SOUTHEASTERN STORY
 
AT 1156 AM...WEATHER RADAR AND LAW ENFORCEMENT OFFICIALS INDICATED A
SEVERE THUNDERSTORM OVER EXTREME NORTHERN POLK COUNTY OR ABOUT 20
MILES NORTH OF DES MOINES NEAR HUXLEY.
 
THE STORM WAS MOVING EAST NORTHEAST AT 40 MILES AN HOUR AND WILL
AFFECT THE TOWNS OF MAXWELL...COLLINS...IOWA
CENTER...RHOADES AND MELBOURNE.
 
THIS STORM WILL LIKELY PRODUCE WINDS IN EXCESS OF 60 MILES AN HOUR
WITH LOCALIZED TREE AND POWER LINE DAMAGE.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...Y
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
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 17 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, 46 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, 20 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.

IssuedProductOfficeCountiesLasted
Jun 7, 11:45 AM CDTSevere Thunderstorm WarningDMXDallas20 min
Jun 7, 11:54 AM CDTSevere Thunderstorm WarningDMXPolk18 min
Jun 7, 5:40 PM CDTSevere Thunderstorm WarningDMXDavis25 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.