Alert archive / Iowa / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 101, NWS Des Moines, IA

June 26, 1990Hamilton County, Hardin County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 26, 1990, 5:02 PM CDT for Hamilton County, Hardin County, Iowa. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Jun 26, 1990, 5:02 PM CDT (22:02 UTC)
Expired
Jun 26, 1990, 6:00 PM CDT
In force
58 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Hamilton County, IA, Hardin 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 267 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 1990-06-26Temperature 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 1990-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.19395878Sfc1 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
33 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
47 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 262204
SVRDSM
IAC079-083-262300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
502 PM CDT TUE JUN 26 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN CENTRAL IOWA
          ...EASTERN HAMILTON...WESTERN HARDIN
 
AT 455 PM...RADAR INDICATED A SEVERE THUNDERSTORM ON THE
HAMILTON/HARDIN COUNTY LINE...OR ABOUT 40 MILES EAST OF FORT DODGE.
THE STORMS WERE MOVING SOUTH AT 20 MILES AN HOUR.
 
TOWNS WHICH WILL BE AFFECTED BY THIS STORM INCLUDE
BUCKEYE...RADCLIFFE...AND INTERSTATE 35 FROM MILE MARKERS 142 SOUTH TO
124 SOUTH.
 
THIS STORM LIKELY PRODUCING LARGE HAIL.
 
 
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.
 
KS/ELLIS/HUTTON/FORSTER

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 26, 3:16 PM CDT, 1 hour 46 minutes before
IAZ002-003-007-262100-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA
NATIONAL WEATHER SERVICE WATERLOO IA
315 PM CDT TUE JUN 26 1990

AT 310 PM CDT...ONE LONE STRONG THUNDERSTORM HAD DEV=ELOPED 15 MILES
SOUTHWEST OF MASON CITY BETWEEN GARNER AND BELMOND.
THIS THUNDERSTORM DEVELOPED VERY RAPIDLY AND IS PRODUCING EXTREMELY
HEAVY RAINS.
THIS STRONG THUNDERSTORM SHOULD BEGIN MOVING TO THE SOUTH.

JOHNSON
Special weather statement, Jun 26, 3:44 PM CDT, 1 hour 18 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IOWA
340 PM CDT TUE JUN 26 1990

AT 333 PM...AN ISOLATED THUNDERSTORM WAS RAPIDLY INTENSIFYING OVER
NORTH CENTRAL IOWA.  THIUS VERY STRONG THUNDERSTORM WAS SOUTHWEST OF
MASON CITY NEAR BELMOND.  IN ADDITION TO THE HEAVY RAINS...SMALL HAIL
IS LIKELY.

THE STORM IS MOVING SOUTH AT 20 MILES AN HOUR...MOVING BETWEEN BELMOND
AND HAMPTON BY 4 PM.

KS
Special weather statement, Jun 26, 4:22 PM CDT, 40 minutes before
IAZ002-003-007-262200-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA
NATIONAL WEATHER SERVICE WATERLOO IA
420 PM CDT TUE JUN 26 1990

AT 415 PM CDT...THE ONE STRONG THUNDERSTORM WAS NOW 30 MILES SOUTH
OF MASON CITY BETWEEN HAMPTON AND DOWS. VERY HEAVY RAINS AND SMALL
HAIL CAN BE EXPECTED WITH THE PASSAGE OF THIS STORM AS IT MOVES TO
THE SOUTH AT 15 MILES AN HOUR. THIS WILL PUT IT IN THE IOWA FALLS
AREA BY 445 PM CDT.

JOHNSON
Special weather statement, Jun 26, 4:40 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IOWA
439 PM CDT TUE JUN 26 1990

AT 431 PM...AN ISOLATED INTENSE THUNDERSTORM CONTINUED IN NORTH CENTRAL
IOWA...ABOUT 10 MILES SOUTHWEST OF HAMPTON OR 30 MILES SOUTHWEST OF
MASON CITY.  THE STORM IS STILL CAPABLE OF PRODUCING BRIEF...VERY HEAVY
RAIN...HAIL AND WIND TO 50 MILES AN HOUR.  IT SHOULD BE IN THE IOWA
FALLS AREA BY 5PM.

OTHER WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING  FROM
45 MILES NORTHWEST OF DES MOINES...TO 40 MILES NORTHEAST OF MASON CITY.

THE SHOWERS AND THUNDERSTORMS WERE MOVING SOUTH AT 20 MILES AN HOUR.

HUTTON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 26, 5:51 PM CDTSevere Thunderstorm WarningDMXStory69 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.