Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 72, NWS Sioux Falls, SD

June 20, 1996Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1996, 12:52 AM CDT for Woodbury County, Iowa. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 20, 1996, 12:52 AM CDT (05:52 UTC)
Expired
Jun 20, 1996, 1:15 AM CDT
In force
23 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 05:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.9 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 1996-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3601 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 1996-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
3601 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1562 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
1.4
Supercell composite
19.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 200552
SVRFSD
IAC193-200615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1252 AM CDT THU JUN 20 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS SD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 115 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...SOUTHEASTERN WOODBURY COUNTY
 
AT 1247 AM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY SIOUX FALLS
DOPPLER RADAR 34 MILES SOUTHEAST OF SIOUX CITY OR 5 MILES NORTHWEST
OF DANBURY MOVING SOUTHEAST AT 30 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
DANBURY                  AROUND 1255 AM CDT

GOLF BALL SIZE HAIL AND DAMAGING WINDS ARE LIKELY WITH THIS STORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

THIS EXTENDS A PORTION OF THE PREVIOUS WARNING FOR EASTERN WOODBURY
COUNTY.

CHAPMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 7:05 PM CDTSevere Thunderstorm WarningFSDOsceola45 min
Jun 19, 7:44 PM CDTSevere Thunderstorm WarningFSDSioux31 min
Jun 19, 8:16 PM CDTSevere Thunderstorm WarningFSDSioux44 min
Jun 19, 9:00 PM CDTSevere Thunderstorm WarningFSDO'Brien, Sioux35 min
Jun 19, 9:18 PM CDTSevere Thunderstorm WarningFSDPlymouth32 min
Jun 19, 9:26 PM CDTSevere Thunderstorm WarningFSDCherokee44 min
Jun 19, 9:49 PM CDTSevere Thunderstorm WarningFSDWoodbury31 min
Jun 19, 9:50 PM CDTSevere Thunderstorm WarningFSDPlymouth35 min
Jun 19, 10:09 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida31 min
Jun 19, 10:22 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury33 min
Jun 19, 10:54 PM CDTSevere Thunderstorm WarningFSDIda31 min
Jun 19, 11:19 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury31 min
Jun 19, 11:50 PM CDTSevere Thunderstorm WarningFSDPlymouth30 min
Jun 20, 12:04 AM CDTSevere Thunderstorm WarningFSDWoodbury46 min
Jun 20, 12:20 AM CDTSevere Thunderstorm WarningFSDPlymouth15 min
Jun 20, 1:26 AM CDTFlash Flood WarningFSDIda3 hr
Jun 20, 8:32 AM CDTFlash Flood WarningFSDIda5 hr
Jun 20, 2:13 PM CDTSevere Thunderstorm WarningFSDWoodbury32 min
Jun 20, 2:24 PM CDTSevere Thunderstorm WarningFSDDickinson46 min
Jun 20, 2:45 PM CDTSevere Thunderstorm WarningFSDWoodbury30 min
Jun 20, 3:04 PM CDTSevere Thunderstorm WarningFSDPlymouth46 min
Jun 20, 3:18 PM CDTSevere Thunderstorm WarningFSDWoodbury47 min
Jun 20, 3:51 PM CDTSevere Thunderstorm WarningFSDPlymouth34 min
Jun 20, 3:55 PM CDTSevere Thunderstorm WarningFSDCherokee35 min
Jun 20, 4:37 PM CDTSevere Thunderstorm WarningFSDWoodbury33 min
Jun 20, 6:09 PM CDTSevere Thunderstorm WarningFSDCherokee, Ida31 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.