Alert archive / Iowa / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 69, NWS Sioux Falls, SD

July 24, 1993Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 24, 1993, 11:04 PM CDT for Woodbury County, Iowa. It was in force for 26 min.

The area

The counties it named.

The facts

Issued: Jul 24, 1993, 11:04 PM CDT (04:04 UTC)
Expired: Jul 24, 1993, 11:30 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Woodbury County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.1 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-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: 2494 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 12.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSUX 250406 RRA
SVRSUX
IAC149-193-250430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
1104 PM CDT SAT JUL 24 1993
 
THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHWEST IOWA
 
   ...SOUTHERN PLYMOUTH COUNTY
 
IN WEST CENTRAL IOWA
 
   ...NORTHEASTERN WOODBURY COUNTY
 
AT 1104 PM CDT A SEVERE THUNDERSTORM WAS LOCATED 5 MILES EAST OF
MOVILLE...20 MILES EAST OF SIOUX CITY. MOVEMENT WAS NORTHEAST AT 35
MILES AN HOUR AND THIS STORM WILL MOVE INTO KINGSLEY BY 1120 PM.
 
AT 1055 PM THE WOODBURY COUNTY SHERIFF REPORTED POWER LINES DOWN AND
SHEET METAL ON THE ROAD NORTH OF CLIMBING HILL.  PEA SIZE HAIL WAS ALSO
REPORTED AROUND 1048.
 
REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYING AREAS. IF YOU ARE IN THE PATH OF THIS STORM
TAKE SHELTER IN A REINFORCED BUILDING IMMEDIATELY.
 
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY REPORTS OF SEVERE
WEATHER TO THE NATIONAL WEATHER SERVICE.
 
IRELAND
&

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 24, 10:05 PM CDT, 59 minutes before

IAZ032-043-250400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1005 PM CDT SAT JUL 24 1993

...HEAVY RAINS WILL MOVE INTO IDA COUNTY...

AT 10 PM CDT A STRONG THUNDERSTORM PRODUCING HEAVY RAIN WAS JUST SOUTH
OF MAPLETON...40 MILES SOUTHEAST OF SIOUX CITY.  MOVEMENT WAS NORTHEAST
AROUND 35 MILES AN HOUR.  THIS STORM WILL CONTINUE TO PRODUCE HEAVY RAIN
AS IT MOVES INTO BATTLE CREEK AND IDA GROVE BY 1045 PM.

IN ADDITION TO THIS STORM...MORE HEAVY RAIN PRODUCING STORMS IN EAST
CENTRAL NEBRASKA WILL BE MOVING INTO SOUTHERN MONONA COUNTY BY 1030 PM.
THESE STORMS WILL TAKE THE SAME PATH AS THE FIRST STORM INCREASING THE
THREAT FOR FLASH FLOODING.

PEOPLE WHO LIVE ALONG THE MAPLE AND SOLDIER RIVERS AND SMALL STREAMS IN
MONONA AND IDA COUNTIES SHOULD BE PREPARD TO MOVE TO HIGHER GROUND
QUICKLY IF FLASH FLOODING IS OBSERVED OR A WARNING IS ISSUED.

IRELAND

Special weather statement, Jul 24, 10:07 PM CDT, 57 minutes before

IAZ032-043-250400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1005 PM CDT SAT JUL 24 1993

...HEAVY RAINS WILL MOVE INTO IDA COUNTY...

AT 10 PM CDT A STRONG THUNDERSTORM PRODUCING HEAVY RAIN WAS JUST SOUTH
OF MAPLETON...40 MILES SOUTHEAST OF SIOUX CITY.  MOVEMENT WAS NORTHEAST
AROUND 35 MILES AN HOUR.  THIS STORM WILL CONTINUE TO PRODUCE HEAVY RAIN
AS IT MOVES INTO BATTLE CREEK AND IDA GROVE BY 1045 PM.

IN ADDITION TO THIS STORM...MORE HEAVY RAIN PRODUCING STORMS IN EAST
CENTRAL NEBRASKA WILL BE MOVING INTO SOUTHERN MONONA COUNTY BY 1030 PM.
THESE STORMS WILL TAKE THE SAME PATH AS THE FIRST STORM INCREASING THE
THREAT FOR FLASH FLOODING.

PEOPLE WHO LIVE ALONG THE MAPLE AND SOLDIER RIVERS AND SMALL STREAMS IN
MONONA AND IDA COUNTIES SHOULD BE PREPARD TO MOVE TO HIGHER GROUND
QUICKLY IF FLASH FLOODING IS OBSERVED OR A WARNING IS ISSUED.

IRELAND

Local storm report, Jul 24, 10:22 PM CDT, 42 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
1022 PM CDT SAT JUL 24 1993

STORM DATA FOR SAT JUL 24 1993

TIME            COUNTY...LOCATION          CHARACTER OF STORM...DAMAGE

645 PM CDT   BUFFALO CO...10 SE STEPHAN    60 TO 70 MPH WIND  LARGE TREE
                                           LIMBS DOWN.

657 PM CDT   HAND CO...14 S REE HEIGHTS    60 TO 70 MPH WIND  SMALL TREES
                                           BLOWN DOWN.

715 PM CDT   HAND CO...7 S REE HEIGHTS     ESTIMATED WIND 70 MPH DESTROYED
                                           BARN.

717 PM CDT   HAND CO...7 S MILLER          60 MPH WIND TREE LIMBS DOWN.

FREDERICK

Local storm report, Jul 24, 10:22 PM CDT, 42 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
1022 PM CDT SAT JUL 24 1993

STORM DATA FOR SAT JUL 24 1993

TIME            COUNTY...LOCATION          CHARACTER OF STORM...DAMAGE

645 PM CDT   BUFFALO CO...10 SE STEPHAN    60 TO 70 MPH WIND  LARGE TREE
                                           LIMBS DOWN.

657 PM CDT   HAND CO...14 S REE HEIGHTS    60 TO 70 MPH WIND  SMALL TREES
                                           BLOWN DOWN.

715 PM CDT   HAND CO...7 S REE HEIGHTS     ESTIMATED WIND 70 MPH DESTROYED
                                           BARN.

717 PM CDT   HAND CO...7 S MILLER          60 MPH WIND TREE LIMBS DOWN.

FREDERICK

Special weather statement, Jul 24, 10:36 PM CDT, 28 minutes before

IAZ031-043-250445-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1036 PM CDT SAT JUL 24 1993

...THUNDERSTORMS WITH GUSTY WINDS WERE MOVING TOWARD WOODBURY COUNTY...

AT 1035 PM CDT STRONG THUNDERSTORMS STRETCHED FROM WHITING TO
ONAWA...WHITING IS 30 MILES SOUTHEAST OF SIOUX CITY.  GUSTY WINDS WERE
REPORTED BY THE MONONA COUNTY SHERIFF IN WHITING.  MOVEMENT WAS
NORTHEAST AT 35 MILES AN HOUR AND PEOPLE IN SLOAN AND HORNICK CAN EXPECT
THE STORMS BY 1050 PM.

ALONG WITH THE GUSTY WINDS HEAVY RAINS WERE ALSO REPORTED IN BOTH
WHITING AND ONAWA.

IRELAND

Special weather statement, Jul 24, 10:39 PM CDT, 25 minutes before

IAZ031-043-250445-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1036 PM CDT SAT JUL 24 1993

...THUNDERSTORMS WITH GUSTY WINDS WERE MOVING TOWARD WOODBURY COUNTY...

AT 1035 PM CDT STRONG THUNDERSTORMS STRETCHED FROM WHITING TO
ONAWA...WHITING IS 30 MILES SOUTHEAST OF SIOUX CITY.  GUSTY WINDS WERE
REPORTED BY THE MONONA COUNTY SHERIFF IN WHITING.  MOVEMENT WAS
NORTHEAST AT 35 MILES AN HOUR AND PEOPLE IN SLOAN AND HORNICK CAN EXPECT
THE STORMS BY 1050 PM.

ALONG WITH THE GUSTY WINDS HEAVY RAINS WERE ALSO REPORTED IN BOTH
WHITING AND ONAWA.

IRELAND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 11:04 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	23 min
Jul 24, 11:13 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	26 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1993 Every severe thunderstorm warning in 1993

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.