Alert archive / Iowa / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 52, NWS Sioux Falls, SD

July 23, 1995Plymouth County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 23, 1995, 5:31 PM CDT for Plymouth County, Iowa. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Jul 23, 1995, 5:31 PM CDT (22:31 UTC)
Expired
Jul 23, 1995, 6:35 PM CDT
In force
64 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Plymouth County, IA

The radar

The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 22:33 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, 10.5 hours before the alert went out and 158 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 1995-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 334 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 12:00Z on 1995-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 square meters per square second.19395878Sfc1 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
334 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
1045 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
26 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 232233 RRA
SVRFSD
IAC149-232335-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
531 PM CDT SUN JUL 23 1995

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 635 PM CDT (535 PM MDT)
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWEST IOWA

   ...PLYMOUTH COUNTY
 
AT 528 PM CDT...A SEVERE THUNDERSTORM WAS DETECTED BY SIOUX FALLS
DOPPLER RADAR 20 MILES NORTH OF SIOUX CITY OR NEAR AKRON MOVING
EAST AT 25 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
RUBLE                    BY 544 PM CDT
ADAVILLE                 BY 545 PM CDT
MILLNERVILLE             BY 546 PM CDT
BRUNSVILLE               BY 602 PM CDT
MERRILL                  BY 606 PM CDT
HINTON                   BY 608 PM CDT
LE MARS                  BY 615 PM CDT
SENEY                    BY 621 PM CDT
NEPTUNE                  BY 621 PM CDT
 
IF YOU ARE CAUGHT OUTSIDE.\..SEEK SHELTER FROM THE WEATHER IN A
STRONG...REINFORCED BUILDING.  DAMAGING WIND...LARGE HAIL...VERY
HEAVY RAIN AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE
THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS
PASSED.

MED

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 23, 5:20 PM CDT, 11 minutes before
MNZ071-072-SDZ040-232325-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
520 PM CDT SUN JUL 23 1995

...URBAN AND SMALL STREAM FLOODING THREAT HAS ENDED FOR BROOKINGS
COUNTY...AND LINCOLN AND LYON COUNTIES IN MINNESOTA...

THUNDERSTORMS WHICH PRODUCED TORRENTIAL RAINS FROM SOUTHERN
BROOKINGS COUNTY ACROSS LINCOLN AND LYON COUNTIES IN MINNESOTA
HAVE MOVED SOUTH AND EAST OF THE AREA.  DOPPLER RADAR ESTIMATES
NEARLY TWO INCHES OF RAIN FELL IN THE PAST THREE HOURS IN SOUTHERN
BROOKINGS COUNTY.  NEARLY TWO INCHES WERE REPORTED IN THE COMMUNITY
OF BROOKINGS...FLOODING STREETS AND LOW LYING AREAS.

THE CHANCE FOR WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL
CONTINUE THROUGH THE EVENING...BUT HEAVY RAINFALL IS NO LONGER
EXPECTED.

CHAPMAN
Special weather statement, Jul 23, 5:21 PM CDT, 10 minutes before
MNZ071-072-SDZ040-232325-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
520 PM CDT SUN JUL 23 1995

...URBAN AND SMALL STREAM FLOODING THREAT HAS ENDED FOR BROOKINGS
COUNTY...AND LINCOLN AND LYON COUNTIES IN MINNESOTA...

THUNDERSTORMS WHICH PRODUCED TORRENTIAL RAINS FROM SOUTHERN
BROOKINGS COUNTY ACROSS LINCOLN AND LYON COUNTIES IN MINNESOTA
HAVE MOVED SOUTH AND EAST OF THE AREA.  DOPPLER RADAR ESTIMATES
NEARLY TWO INCHES OF RAIN FELL IN THE PAST THREE HOURS IN SOUTHERN
BROOKINGS COUNTY.  NEARLY TWO INCHES WERE REPORTED IN THE COMMUNITY
OF BROOKINGS...FLOODING STREETS AND LOW LYING AREAS.

THE CHANCE FOR WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL
CONTINUE THROUG@H THE EVENING...BUT HEAVY RAINFALL IS NO LONGER
EXPECTED.

CHAPMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 3:26 PM CDTSevere Thunderstorm WarningFSDLyon44 min
Jul 23, 5:03 PM CDTSevere Thunderstorm WarningFSDSioux62 min
Jul 23, 6:20 PM CDTSevere Thunderstorm WarningFSDWoodbury50 min
Jul 23, 6:34 PM CDTTornado WarningFSDPlymouth23 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1995Every severe thunderstorm warning in 1995

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.