Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 188, NWS Des Moines, IA

September 7, 1990Buena Vista County, Clay County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Sep 7, 1990, 5:01 PM CDT for Buena Vista County, Clay County, Iowa. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
Sep 7, 1990, 5:01 PM CDT (22:01 UTC)
Expired
Sep 7, 1990, 5:45 PM CDT
In force
44 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Buena Vista County, IA, Clay 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, 10.0 hours before the alert went out and 203 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 1990-09-07Temperature 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 1990-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
3615 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Sep 7, 3:09 PM CDT, 1 hour 52 minutes before
IAZ002-003-007-072100-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA
NATIONAL WEATHER SERVICE WATERLOO IA
305 PM CDT FRI SEP 7 1990

...TORNADO WATCH FOR NORTH CENTRAL IOWA UNTIL 800 PM CDT...

A 305 PM CDT SCATTERED SHOWERS HAD DEVELOPED OVER PARTS OF NORTHEAST
IOWA...MAINLY NORTH OF DECORAH AND ALONG THE IOWA/MINNESOTA BORDER
NORTH OF MASON CITY.  THE SHOWERS WERE MOVING SOUTHEAST AT 25 MILES
AN HOUR.  THE REST OF NORTHEAST IOWA HAD MOSTLY SUNNY SKIES.  THE
TEMPERATURES WERE IN THE UPPER 70S TO LOWER 80S.  THE WINDS WERE EAST
TO SOUTHEAST AT 5 TO 15 MILES AN HOUR.

AT 400 PM CDT THE SKY OVER NORTHEAST IOWA SHOULD BE PARTLY CLOUDY WITH
SHOWERS AND THUNDERSTORMS POSSIBLE ABOUT ANYWHERE. TEMPERATURES SHOULD
REMAIN STEADY WITH VARIABLE WINDS 5 TO 15 MILES AN HOUR.  NO SEVERE
WEATHER HAS BEEN REPORTED IN THE TORNADO WATCH AREA. PEOPLE IN AND NEAR
THE WATCH AREA SHOULD REMAIN ALERT FOR RAPID CHANGES IN THE WEATHER
CONDITIONS. BE PREPARED TO TAKE PROTECTIVE ACTION IF SEVERE WEATHER
STARTS TO OCCUR.
Special weather statement, Sep 7, 3:18 PM CDT, 1 hour 43 minutes before
IAZALL-072120-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA
NATIONAL WEATHER SERVICE DES MOINES IA
315 PM CDT FRI SEP 7 1990

...TORNADO WATCH IN EFFECT FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL
8 PM CDT THIS FRIDAY EVENING...

AT 310 PM...WIDELY SCATTERED LIGHT SHOWERS WERE OCCURRING OVER SOUTHWEST
AND SOUTH CENTRAL IOWA.  MOST OF THE SHOWERS WERE ALONG AND SOUTH OF A
COUNCIL BLUFFS TO DES MOINES LINE.  MOST OF THE SHOWERS STRETCHED FROM
REDFIELD...25 MILES WEST OF DES MOINES...TO THE ATLANTIC AREA...65 MILES
SOUTHWEST OF DES MOINES...AND NEAR AFTON...40 MILES SOUTHWEST OF DES
MOINES.  THESE SHOWERS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.

ALSO...INTENSE THUNDERSTORMS WERE APPROACHING THE IOWA BORDER NORTH OF
THE IOWA GREAT LAKES...80 MILES NORTHEAST OF SIOUX CITY.  THESE STORMS
WERE MOVING SOUTHEAST AT 25 MILES AN HOUR.

THE ONE TO TWO HOUR OUTLOOK IS FOR THE STORMS APPROACHING THE NORTHWEST
IOWA BORDER TO MOVE INTO THE IOWA GREAT LAKES AREA AND ADJACENT AREAS
OF NORTH CENTRAL IOWA.  ALSO...THE SHOWERS OVER SOUTHERN IOWA WILL
CONTINUE TO BUILD...PRODUCING OCCASIONAL THUNDERSHOWERS.

DM
Special weather statement, Sep 7, 3:45 PM CDT, 1 hour 16 minutes before
IAZALL-072130-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
342 PM CDT FRI SEP 7 1990

...TORNADO WATCH IN EFFECT FOR NORTHWEST AND NORTH CENTRAL IOWA UNTIL
8 PM CDT THIS FRIDAY EVENING...

AT 335 PM...SCATTERED SHOWERS AND ISOLATED STRONG THUNDERSTORMS WERE
MOVING INTO THE NORTHERN TIER OF IOWAS COUNTIES. THE STRONGEST STORMS
WERE STILL LOCATED IN SOUTHERN MINNESOTA...HOWEVER STRONG STORMS WERE
APPROACHING THE SPIRIT LAKE AREA SOME 25 MILES NORTH OF SPENCER. PEOPLE
ON SPIRIT LAKE SHOULD BE PREPARED TO MOVE TO A PLACE OF SAFE HARBOR AS
THESE STORMS APPROACH. THE SHOWERS AND STORMS OVER NORTHERN IOWA WERE
LOCATED NORTH OF A LINE FROM SPIRIT LAKE EAST TO DECORAH.

SCATTERED LIGHT SHOWERS WERE OCCURRING FROM SOUTHWEST INTO CENTRAL IOWA.
THESE SHOWERS WERE ALONG AND 20 MILES EITHER SIDE OF A LINE FROM 10
SOUTHEAST OF OMAHA/CONCIL BLUFFS EAST TO WINTERSET OR 20 MILES SOUTHWEST
OF DES MOINES.

THE S4HOWERS AND STORMS WERE MOVING SOUTH SOUTHEAST AT 25 MILES AN HOUR.

BARLOW/MILLER
Special weather statement, Sep 7, 4:10 PM CDT, 51 minutes before
IAZ002-003-007-072200-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA
NATIONAL WEATHER SERVICE WATERLOO IA
405 PM CDT FRI SEP 7 1990

...TORNADO WATCH FOR NORTH CENTRAL IOWA UNTIL 800 PM CDT...

A 405 PM CDT SCATTERED SHOWERS AND THUNDERSTORMS WERE LOCATED ALONG
THE IOWA/MINNESOTA BORDER FROM NORTHWEST OF MASON CITY TO EAST OF
DECORAH ON THE MISSISSIPPI RIVER.  THE SHOWERS AND THUNDERSTORMS WERE
MOVING SOUTHEAST AT 25 MILES AN HOUR.  ELSEWHERE IN NORTHEAST IOWA
THE SKIES WERE PARTLY CLOUDY.  THE TEMPERATURES WERE IN THE UPPER
70S AND LOWER 80S. THE WINDS WERE SOUTHEAST AT 5 TO 15 MILES AN HOUR.

AT 500 PM CDT THE SKY OVER NORTHEAST IOWA SHOULD BE PARTLY CLOUDY WITH
SHOWERS AND THUNDERSTORMS POSSIBLE ABOUT ANYWHERE. TEMPERATURES SHOULD
REMAIN STEADY WITH VARIABLE WINDS 5 TO 15 MILES AN HOUR. SOME HALF INCH
HAIL HAS BEEN REPORTED IN THE TORNADO WATCH AREA. PEOPLE IN AND NEAR
THE WATCH AREA SHOULD REMAIN ALERT FOR RAPID_ CHANGES IN THE WEATHER
CONDITIONS. BE PREPARED TO TAKE PROTECTIVE ACTION IF SEVERE WEATHER
STARTS TO OCCUR.
Special weather statement, Sep 7, 4:18 PM CDT, 43 minutes before
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Special weather statement, Sep 7, 4:48 PM CDT, 13 minutes before
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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 3:47 PM CDTSevere Thunderstorm WarningDMXEmmet28 min
Sep 7, 4:05 PM CDTSevere Thunderstorm WarningDMXKossuth40 min
Sep 7, 4:15 PM CDTSevere Thunderstorm WarningDMXEmmet, Palo Alto35 min
Sep 7, 5:39 PM CDTSevere Thunderstorm WarningDMXBuena Vista36 min
Sep 7, 6:17 PM CDTSevere Thunderstorm WarningDMXBuena Vista, Calhoun, Pocahontas, Sac43 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.