Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 101, NWS Sioux Falls, SD

July 1, 1996Sioux County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 1, 1996, 5:25 PM CDT for Sioux 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, 5:25 PM CDT (22:25 UTC)
Expired: Jul 1, 1996, 6:10 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 72 km from the middle of the area, began a volume at 22:29 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, 10.4 hours before the alert went out and 197 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 012225
SVRFSD
IAC167-012310-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS SD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 610 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...SOUTHERN SIOUX COUNTY
 
AT 522 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY SIOUX FALLS
DOPPLER RADAR 35 MILES NORTH OF SIOUX CITY NEAR IRETON MOVING EAST
AT 15 MPH.

THIS STORM WILL MOVE ALONG HIGHWAY 10 AND CAN BE EXPECTED IN THE
VICINITY OF...
MAURICE                  AROUND 550 PM CDT
SIOUX CENTER             AROUND 550 PM CDT

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO
WARNING.
 
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 YOLUR
HOME OR BUSINESS.

 JCV

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, 5:15 PM CDT, 10 minutes before

SDZ056-061-062-065>070-020000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
515 PM CDT MON JUL 1 1996

...TORNADO WATCH CANCELLED FOR MOST OF SOUTHEAST SOUTH DAKOTA EXCEPT
UNION COUNTY...

THE NATIONAL WEATHER SERVICE HAS CANCELLED THE TORNADO WATCH FOR MOST OF
SOUTHEAST SOUTH DAKOTA EXCEPT FOR UNION COUNTY IN THE EXTREME SOUTHEAST.

THE COUNTIES NO LONGER AFFECTED BY THE TORNADO WATCH INCLUDE...
MINNEHAHA...MOODY...BON HOMM E...CLAY...HUTCHINSON...LINCOLN...MCCOOK...
TURNER...AND YANKTON.  THE THREAT OF SEVERE WEATHER HAS MOVED TO THE
SOUTHEAST OF THESE AREAS INTO MINNESOTA...IOWA...NEBRASKA...AND UNION
COUNTY SOUTH DAKOTA.

RYRHOLM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:55 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	45 min
Jul 1, 4:07 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	33 min
Jul 1, 4:31 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	49 min
Jul 1, 5:09 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	31 min
Jul 1, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	43 min
Jul 1, 6:16 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	44 min
Jul 1, 6:23 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	52 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996 Every 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.