Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 94, NWS Sioux Falls, SD

July 1, 1996Lyon County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 1, 1996, 3:55 PM CDT for Lyon County, Iowa. It was in force for 45 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
Jul 1, 1996, 3:55 PM CDT (20:55 UTC)
Expired
Jul 1, 1996, 4:40 PM CDT
In force
45 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Lyon County, IA

The radar

The Sioux Falls radar (KFSD), 48 km from the middle of the area, began a volume at 20:58 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 12:00Z, 8.9 hours before the alert went out and 230 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 1996-07-01Temperature 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 1996-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2113 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
38 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 KFSD 012055
SVRFSD
IAC119-012140-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
355 PM CDT MON JUL 1 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS SD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 440 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...LYON COUNTY
 
AT 352 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY SIOUX FALLS
DOPPLER RADAR 10 MILES SOUTHEAST OF SIOUX FALLS  OR 5 MILES WEST OF
KLONDIKE MOVING EAST AT 20 MPH.

GOLFBALL SIZED HAIL WAS REPORTED IN HARRISBURG AT 348 PM.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
KLONDIKE                 AROUND 400 PM CDT
INWOOD                   AROUND 410 PM CDT
LARCHWOOD                AROUND 410 PM CDT
LESTER                   AROUND 425 PM CDT
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 4:07 PM CDTSevere Thunderstorm WarningFSDPlymouth33 min
Jul 1, 4:31 PM CDTSevere Thunderstorm WarningFSDSioux49 min
Jul 1, 5:09 PM CDTSevere Thunderstorm WarningFSDPlymouth31 min
Jul 1, 5:25 PM CDTSevere Thunderstorm WarningFSDSioux45 min
Jul 1, 5:42 PM CDTSevere Thunderstorm WarningFSDPlymouth43 min
Jul 1, 6:16 PM CDTSevere Thunderstorm WarningFSDWoodbury44 min
Jul 1, 6:23 PM CDTSevere Thunderstorm WarningFSDPlymouth52 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.