Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 90, NWS Sioux Falls, SD

July 5, 1994Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 1994, 7:59 PM CDT for Woodbury County, Iowa. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 5, 1994, 7:59 PM CDT (00:59 UTC)
Expired
Jul 5, 1994, 8:45 PM CDT
In force
46 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Woodbury County, IA

What was reported inside it

TimeReportWhereRemark
Jul 5, 8:40 PM CDTTornado F3Salix To, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 122 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 1994-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3368 joules per kilogram.LCLEL10008507005003002001001 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 1994-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
3368 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1281 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.8
Supercell composite
8.0

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KSUX 060102 RRA
SVRSUX
IAC193-060145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
759 PM CDT TUE JUL 5 1994
 
THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  845 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL IOWA
 
   ...WESTERN WOODBURY COUNTY
 
A SEVERE THUNDERSTORM WAS REPORTED BY THE POLICE JUST NORTH OF SLOAN
IOWA JUST SOUTHEAST OF THE SIOUX CITY AREA MOVING NORTHEAST. A FUNNEL
CLOUD WAS ALSO REPORTED IN THE AREA.
 
 
THIS IS A DANGEROUS STORM IF CAUGHT IN THE PATH OF THIS STORM PLEASE
TAKE COVER IMMEDIATELY...
 
KLINE

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 8:37 PM CDTTornado WarningFSDWoodbury38 min
Jul 5, 8:42 PM CDTTornado WarningFSDWoodbury33 min
Jul 5, 9:18 PM CDTTornado WarningFSDWoodbury27 min
Jul 5, 9:41 PM CDTSevere Thunderstorm WarningFSDSioux64 min
Jul 5, 9:47 PM CDTTornado WarningFSDWoodbury28 min
Jul 5, 10:16 PM CDTTornado WarningFSDWoodbury29 min
Jul 5, 10:43 PM CDTSevere Thunderstorm WarningFSDPlymouth47 min
Jul 5, 11:21 PM CDTSevere Thunderstorm WarningFSDMonona, Woodbury54 min
Jul 6, 12:14 AM CDTSevere Thunderstorm WarningFSDMonona46 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.