Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 9, NWS Des Moines, IA

April 14, 1994Black Hawk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 14, 1994, 10:08 PM CDT for Black Hawk County, Iowa. It was in force for 52 min.

The area

The counties it named.

The facts

Issued
Apr 14, 1994, 10:08 PM CDT (03:08 UTC)
Expired
Apr 14, 1994, 11:00 PM CDT
In force
52 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Black Hawk County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 3.1 hours before the alert went out and 284 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, Minneapolis, MN at 00:00Z on 1994-04-15Temperature 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, Minneapolis, MN at 00:00Z on 1994-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.1939587897Sfc1 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
2199 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
178 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 KALO 150309
SVRALO
IAC013-150400-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WATERLOO IA
1008 PM CDT THU APR 14 1994
 
THE NATIONAL WEATHER SERVICE IN WATERLOO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1100 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST IOWA
 
   ...BLACK HAWK COUNTY
 
AT 1005 PM...WEATHER SERVICE RADAR IN WATERLOO WAS INDICATING SEVERE
THUNDERSTORMS LOCATED 15 MILES SOUTH OF WATERLOO OR FROM 5 MILES SOUTH
TO 5 MILES SOUTHEAST OF HUDSON. MOVEMENT WAS TO THE NORTHEAST AT 25
MILES AN HOUR AND WILL BE AFFECTING THE TOWNS OF HUDSON...LA PORTE
CITY...EVANSDALE...AND THE WATERLOO/CEDAR FALLS AREA.
 
THESE STORMS HAVE A HISTORY OF PRODUCING LARGE HAIL...AND STRONG GUSTY
WINDS.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...MOVE INSIDE A REINFORCED
BUILDING.  STAY AWAY FROM WINDOWS.  DON'T USE ELECTRICAL APPLIANCES
OR TELEPHONES EXCEPT IN AN EMERGENCY UNTIL THE SrTORM HAS PASSED.
 
 
 
LINDENBERG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 8:29 PM CDTSevere Thunderstorm WarningDMXTaylor31 min
Apr 14, 8:34 PM CDTSevere Thunderstorm WarningDMXCass41 min
Apr 14, 9:04 PM CDTSevere Thunderstorm WarningDMXAdair, Cass41 min
Apr 14, 9:39 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall36 min
Apr 14, 9:40 PM CDTSevere Thunderstorm WarningDMXGrundy35 min
Apr 14, 9:44 PM CDTSevere Thunderstorm WarningDMXMadison, Union31 min
Apr 14, 9:47 PM CDTSevere Thunderstorm WarningDMXDallas, Guthrie43 min
Apr 14, 9:55 PM CDTSevere Thunderstorm WarningDMXPolk35 min
Apr 14, 10:08 PM CDTTornado WarningDMXAdair37 min
Apr 14, 10:24 PM CDTSevere Thunderstorm WarningDMXBuchanan51 min
Apr 14, 10:26 PM CDTSevere Thunderstorm WarningDMXDallas, Polk34 min
Apr 14, 10:27 PM CDTSevere Thunderstorm WarningDMXTama48 min
Apr 14, 10:55 PM CDTSevere Thunderstorm WarningDMXStory35 min
Apr 14, 11:03 PM CDTTornado WarningDMXStory27 min
Apr 14, 11:04 PM CDTSevere Thunderstorm WarningDMXBlack Hawk26 min
Apr 14, 11:23 PM CDTSevere Thunderstorm WarningDMXMarshall19 min
Apr 14, 11:39 PM CDTSevere Thunderstorm WarningDMXGrundy25 min
Apr 14, 11:47 PM CDTSevere Thunderstorm WarningDMXVan Buren28 min
Apr 15, 12:09 AM CDTSevere Thunderstorm WarningDMXLinn36 min
Apr 15, 12:10 AM CDTSevere Thunderstorm WarningDMXBlack Hawk21 min
Apr 15, 12:15 AM CDTSevere Thunderstorm WarningDMXBuchanan29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994Every severe thunderstorm warning in 1994

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.