Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 45, NWS Des Moines, IA

July 1, 1992Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 1, 1992, 11:35 PM CDT for Crawford County, Iowa. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 1, 1992, 11:35 PM CDT (04:35 UTC)
Expired
Jul 2, 1992, 12:30 AM CDT
In force
55 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Crawford County, IA

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 4.6 hours before the alert went out and 114 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 00:00Z on 1992-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1215 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1992-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
1215 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
1615 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.2
Supercell composite
5.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 020434
SVRDSM
IAC047-020530-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1135 PM CDT WED JUL 1 1992
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1230 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL IOWA
 
   ...CRAWFORD COUNTY
 
AT 1135 PM...RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 40 MILES NORTH-
EAST OF COUNCIL BLUFFS IN WEST CENTRAL IOWA. THE STORM WAS MOVING
NORTHEAST AT 25 MILES AN HOURS AND WILL AFFECTING THE CITIES OF
DENISON...DOW CITY AND ARION BETWEEN 1145 PM AND 1230 AM CDT.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING.  MOVE TO THE CENTER OF YOUR HOUSE...STAY AWAY
FROM WINDOWS...AND BE READY TO ACT QUICKLY IF A TORNADO DEVELOPS.
 
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.

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, Jul 1, 9:34 PM CDT, 2 hours 1 minute before
IAZALL-020335-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
934 PM CDT WED JUL 1 1992

AT 925 PM CDT...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED
OVER NORTHWEST AND NORTH CENTRAL IOWA.  THE STORMS AND SHOWERS WERE
LOCATED GENERALLY NORTHWEST OF A LINE EXTENDING FROM STORM LAKE...TO
THE IOWA/MINNESOTA BORDER 35 MILES NORTHWEST OF MASON CITY.  SOME OF
THE STRONGER STORMS IN THIS AREA MAY PRODUCE BRIEF HEAVY RAIN...GUSTY
WINDS OF 40 TO 50 MILES AN HOUR...AND FREQUENT DANGEROUS LIGHTNING.

THE SHOWERS AND STORMS WERE MOVING EAST AT 25 TO 30 MILES AN HOUR.

JAK
Special weather statement, Jul 1, 10:42 PM CDT, 53 minutes before
IAZALL-020440-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1042 PM CDT WED JUL 1 1992

...A TORNADO WATCH IS IN EFFECT FOR PARTS OF WEST CENTRAL AND SOUTHWEST
   IOWA UNTIL 4 AM THURSDAY MORNING...

AT 1030 PM CDT...ISOLATED THUNDERSTORMS AND SCATTERED SHOWERS WERE
OCCURRING OVER THE NORTHWEST THIRD OF IOWA.  THE STORMS AND SHOWERS WERE
LOCATED NORTHWEST OF A LINE EXTENDING FROM THE IOWA/NEBRASKA BORDER 20
MILES NORTH OF OMAHA/COUNCIL BLUFFS...THROUGH STORM LAKE...TO THE
IOWA/MINNESOTA BORDER 45 MILES NORTHWEST OF MASON CITY.

SOME OF THE STRONGER THUNDERSTORMS IN THIS AREA MAY PRODUCE BRIEF VERY
HEAVY RAIN...GUSTY WINDS OF 40 TO 50 MILES AN HOUR AND DEADLY LIGHTNING.

THE SHOWERS AND STORMS WERE MOVING EAST AT 20 TO 25 MILES AN HOUR.

JAK
Special weather statement, Jul 1, 11:13 PM CDT, 22 minutes before
IAZALL-020610-

SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR IOWA
NATIONAL WEATHER SERVICE DES MOINES IA
1113 PM CDT WED JUL 1 1992

...A TORNADO WATCH IS IN EFFECT FOR PARTS OF SOUTHWEST AND WEST CENTRAL
   IOWA UNTIL 4 AM THURSDAY MORNING...

SHOWERS AND THUNDERSTORMS WERE LOCATED OVER THE NORTHWEST THIRD OF IOWA
AT 11 PM...NORTHWEST OF A LINE FROM COUNCIL BLUFFS...THROUGH STORM LAKE
TO THE MINNESOTA BORDER NORTH OF MASON CITY.

SHOWERS AND WIDELY SCATTERED STRONG THUNDERSTORMS WILL CONTINUE MOVING
ACROSS THE NORTHWEST THIRD OF IOWA THROUGH 1 AM.  SOME OF THESE STORMS
MAY PRODUCE HEAVY RAIN AND GUSTY WINDS.

OTHERWISE SKIES WILL BE PARTLY TO MOSTLY CLOUDY WITH TEMPERATURES IN THE
MI>DDLE 60S TO AROUND 80 DEGREES.

JAK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 1:14 AM CDTSevere Thunderstorm WarningDMXAudubon61 min
Jul 2, 2:16 AM CDTSevere Thunderstorm WarningDMXAdair, Cass44 min
Jul 2, 9:11 AM CDTSevere Thunderstorm WarningDMXPolk, Story34 min
Jul 2, 9:50 AM CDTTornado WarningDMXMarshall25 min
Jul 2, 9:50 AM CDTTornado WarningDMXStory20 min
Jul 2, 9:56 AM CDTSevere Thunderstorm WarningDMXJasper34 min
Jul 2, 10:09 AM CDTSevere Thunderstorm WarningDMXGrundy51 min
Jul 2, 10:21 AM CDTSevere Thunderstorm WarningDMXPoweshiek, Tama24 min
Jul 2, 10:43 AM CDTSevere Thunderstorm WarningDMXBenton42 min
Jul 2, 10:44 AM CDTSevere Thunderstorm WarningDMXBlack Hawk46 min
Jul 2, 10:44 AM CDTSevere Thunderstorm WarningDMXGrundy23 min
Jul 2, 10:55 AM CDTSevere Thunderstorm WarningDMXKeokuk43 min
Jul 2, 11:08 AM CDTSevere Thunderstorm WarningDMXAppanoose37 min
Jul 2, 11:30 AM CDTSevere Thunderstorm WarningDMXDavis, Wapello30 min
Jul 2, 2:58 PM CDTTornado WarningDMXMahaska32 min
Jul 2, 3:12 PM CDTTornado WarningDMXKeokuk, Wapello21 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1992Every severe thunderstorm warning in 1992

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.