Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 24, NWS Sioux Falls, SD

May 19, 1996Lyon County, Sioux County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 19, 1996, 12:18 AM CDT for Lyon County, Sioux County, Iowa. It was in force for 27 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
May 19, 1996, 12:18 AM CDT (05:18 UTC)
Expired
May 19, 1996, 12:45 AM CDT
In force
27 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Lyon County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 05:22 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, 5.3 hours before the alert went out and 213 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 1996-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2760 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 1996-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
2760 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
1505 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 190518
SVRFSD
IAC119-167-190545-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1218 AM CDT SUN MAY 19 1996

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...EASTERN LYON COUNTY
   ...EASTERN SIOUX COUNTY
 
AT 1212 AM CDT...A LINE OF SEVERE THUNDERSTORMS WITH DAMAGING
WINDS WAS DETECTED BY SIOUX FALLS DOPPLER RADAR 15 MILES WEST OF
SIBLEY TO 40 MILES SOUTHWEST OF SIBLEY...OR FROM NEAR ROCK RAPIDS
TO IRETON...RACING EAST AT 50 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
GEORGE                   AROUND 1220 AM CDT
LITTLE ROCK              AROUND 1220 AM CDT
BOYDEN                   AROUND 1225 AM CDT
MATLOCK                  AROUND 1225 AM CDT
SHELDON                  AROUND 1230 AM 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.

SEVERE THUNDERSTORMS CAN AND OFTEN DO PRODUCE TORNADOES WITH LITTLE
OR NO ADVANCEJ WARNING.  A TORNADO WATCH REMAINS IN EFFECT UNTIL 4 AM.

THIS WARNING REPLACES THE PREVIOUS WARNING FOR WESTERN SIOUX AND
LYON COUNTY.

CHAPMAN

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

Local storm report, May 18, 11:00 PM CDT, 1 hour 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1100 PM CDT SAT MAY 18 1996

TIME CDT     .....CITY LOCATION.....    STATE      ...EVENT/REMARKS...
             ....COUNTY LOCATION....

830 PM       CHAMBERLAIN                SD         1.75 INCH HAIL
5/18/96      BRULE                                 60 MPH WINDS

900 PM       CHAMBERLAIN                SD         1.00 INCH HAIL
5/18/96      BRULE

908 PM       KIMBALL                    SD         PEA/SIZE HAIL
5/18/96      BRULE

920 PM       WEST OF WHITE LAKE         SD         0.5 INCH HAIL
5/18/96      AURORA

930 PM       NORTHEAST OF HETLAND       SD         0.5 INCH HAIL
5/18/96      KINGSBURY

930 PM       3S HOWARD                  SD         TORNADO OVERTURNED
5/18/96      MINER                                 CARS...DOWNED LARGE
                                                   TREES...CAUSED FIRES

955 PM       1S HOWARD                  SD         55 MPH WINDS
5/18/96      MINER

1038 PM      4SE BROOKINGS              SD         TORNADO REPORTED
5/18/96                                            BY PUBLIC

RSR

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 11:57 PM CDTSevere Thunderstorm WarningFSDLyon, Sioux28 min
May 19, 12:40 AM CDTSevere Thunderstorm WarningFSDOsceola30 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.