Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 32, NWS Sioux Falls, SD

June 6, 1994Plymouth County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 6, 1994, 8:41 PM CDT for Plymouth County, Iowa. It was in force for 29 min.

The area

The counties it named.

The facts

Issued: Jun 6, 1994, 8:41 PM CDT (01:41 UTC)
Expired: Jun 6, 1994, 9:10 PM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Plymouth County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.7 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-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: 1216 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1808 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KSUX 070142 RRA
SVRSUX
IAC149-070215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
841 PM CDT MON JUN 6 1994
 
THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHWEST IOWA
 
   ...NORTHERN PLYMOUTH COUNTY
 
AT 837 PM CDT A SEVERE THUNDERSTORM WAS 2 MILES WEST OF LE MARS
IOWA...25 MILES NORTHEAST OF SIOUX CITY. MOVEMENT WAS SOUTHEAST AT 20
MILES AN HOUR. THE THUNDERSTORM WILL MOVE THROUGH LE MARS BY AROUND 845
PM CDT.
 
AT 830 PM CDT THIS THUNDERSTORM PRODUCE GOLFBALL SIZE HAIL AT CRAIG
IOWA...30 MILES NORTHEAST OF SIOUX CITY.
 
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.
 
SQI
 
&

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, Jun 6, 8:24 PM CDT, 17 minutes before

IAZ013-020-021-031-032-043-NEZ013>015-SDZ071-070215-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
824 PM CDT MON JUN 6 1994

...ISOLATED THUNDERSTORMS WILL CONTINUE TONIGHT...

AT 820 PM CDT A STRONG THUNDERSTORM WAS 25 MILES NORTHEAST OF SIOUX
CITY...JUST TO THE NORTH OF LE MARS.  THIS STORM WILL MOVE THROUGH
LE MARS BY AROUND 845 PM AND IT WILL PRODUCE BRIEF HEAVY RAIN ALONG
WITH SMALL HAIL.

OTHER SHOWERS AND THUNDERSTORMS WERE SCATTERED FROM SANBORN TO
LARRABEE IOWA...50 TO 60 MILES NORTHEAST OF SIOUX CITY.

SQI

Special weather statement, Jun 6, 8:26 PM CDT, 15 minutes before

IAZ013-020-021-031-032-043-NEZ013>015-SDZ071-070215-

SPECIAL WEATHER STATEMENT...CORRECTED TO ADD LAST LINES
NATIONAL WEATHER SERVICE SIOUX CITY IA
826 PM CDT MON JUN 6 1994

...ISOLATED THUNDERSTORMS WILL CONTINUE TONIGHT...

AT 820 PM CDT A STRONG THUNDERSTORM WAS 25 MILES NORTHEAST OF SIOUX
CITY...JUST TO THE NORTH OF LE MARS.  THIS STORM WILL MOVE THROUGH
LE MARS BY AROUND 845 PM AND IT WILL PRODUCE BRIEF HEAVY RAIN ALONG
WITH SMALL HAIL.

OTHER SHOWERS AND THUNDERSTORMS WERE SCATTERED FROM SANBORN TO
LARRABEE IOWA...50 TO 60 MILES NORTHEAST OF SIOUX CITY.

THE SEVERE THUNDERSTORMS WATCH FOR MUCH OF THE SIOUXLAND AREA HAS
BEEN ALLOWED TO EXPIRE AT 8 PM CDT.

SQI

Special weather statement, Jun 6, 8:26 PM CDT, 15 minutes before

SDZALL-IAZ001-070145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
820 PM CDT MON JUN 6 1994

...SEVERE THUNDERSTORM WATCH FOR EASTERN SOUTH DAKOTA...SOUTHWEST
MINNESOTA AND NORTHWEST IOWA HAS EXPIRED...

SEVERE THUNDERSTORM WATCH NUMBER 344 FOR PARTS OF EASTERN SOUTH DAKOTA
...SOUTHWEST MINNESOTA AND NORTHWEST IOWA HAS EXPIRED. THE ONLY
THUNDERSTORM PRODUCING ANY SEVERE WEATHER WAS CURRENTLY MOVING THROUGH
THE SIOUX FALLS AREA AND IS EXPECTED TO MOVE SOUTH AND EAST THROUGH
SOUTHERN MINNEHAHA...NORTHERN LINCOLN OF SOUTH DAKOTA AND WESTERN LYON
COUNTY OF IOWA BY 915 PM CDT. AS THE STORM MOVES INTO THESE AREA IT IS
ALSO EXPECTED TO BE WEAKING.

WB

Special weather statement, Jun 6, 8:28 PM CDT, 13 minutes before

IAZ013-020-021-031-032-043-NEZ013>015-SDZ071-070215-

SPECIAL WEATHER STATEMENT...CORRECTED TO ADD LAST LINES
NATIONAL WEATHER SERVICE SIOUX CITY IA
826 PM CDT MON JUN 6 1994

...ISOLATED THUNDERSTORMS WILL CONTINUE TONIGHT...

AT 820 PM CDT A STRONG THUNDERSTORM WAS 25 MILES NORTHEAST OF SIOUX
CITY...JUST TO THE NORTH OF LE MARS.  THIS STORM WILL MOVE THROUGH
LE MARS BY AROUND 845 PM AND IT WILL PRODUCE BRIEF HEAVY RAIN ALONG
WITH SMALL HAIL.~

OTHER SHOWERS AND THUNDERSTORMS WERE SCATTERED FROM SANBORN TO
LARRABEE IOWA...50 TO 60 MILES NORTHEAST OF SIOUX CITY.

THE SEVERE THUNDERSTORMS WATCH FOR MUCH OF THE SIOUXLAND AREA HAS
BEEN ALLOWED TO EXPIRE AT 8 PM CDT.

SQI

Local storm report, Jun 6, 8:40 PM CDT, 1 minute before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
840 PM CDT MON JUN 6 1994

STORM DATA FOR JUNE 6 1994

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

 600 PM CDT   11/4 INCH HAIL 4 MILES E OF CHANDLER MN IN MURRAY CO. MN.
              BY NWS EMPLOYEE.

 605 PM CDT   2 INCH HAIL IONA MN IN MURRAY CO. MN. BY NWS EMPLOYEE.

 648 PM CDT   WESTERN JACKSON COUNTY MN.  AT THE INTERSECTION OF I90
              AND HWY 264.  60 MPH WIND GUSTS.  BY NWS EMPLOYEE.

 735 PM CDT   MARBLE TO GOLFBALL SIZE HAIL IN THE HARTFORD...HUMBOLT
              AREA.  MINNEHAHA CO. SD.  NWS SPOTTER.
.
 740 PM CDT   1 INCH HAIL IN CROOKS SD. MINNEHAHA COUNTY.
              BY NWS SPOTTER.

 753 PM CDT   1 INCH HAIL IN SIOUX FALLS SD AT THE INTERSECTION OF
              I29 AND I90.  BY HAM SPOTTER NETWORK.

 804 PM CDT   1 INCH HAIL AT THE SIOUX FALLS SD.  OBSERVED BY
              NWS EMPLOYEES AND REFLECTED ON OBSERVATIONS.
DEMORIN

Local storm report, Jun 6, 8:41 PM CDT, 0 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
840 PM CDT MON JUN 6 1994

STORM DATA FOR JUNE 6 1994

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

 600 PM CDT   11/4 INCH HAIL 4 MILES E OF CHANDLER MN IN MURRAY CO. MN.
              BY NWS EMPLOYEE.

 605 PM CDT   2 INCH HAIL IONA MN IN MURRAY CO. MN. BY NWS EMPLOYEE.

 648 PM CDT   WESTERN JACKSON COUNTY MN.  AT THE INTERSECTION OF I90
              AND HWY 264.  60 MPH WIND GUSTS.  BY NWS EMPLOYEE.

 735 PM CDT   MARBLE TO GOLFBALL SIZE HAIL IN THE HARTFORD...HUMBOLT
              AREA.  MINNEHAHA CO. SD.  NWS SPOTTER.
.
 740 PM CDT   1 INCH HAIL IN CROOKS SD. MINNEHAHA COUNTY.
              BY NWS SPOTTER.

 753 PM CDT   1 INCH HAIL IN SIOUX FALLS SD AT THE INTERSECTION OF
              I29 AND I90.  BY HAM SPOTTER NETWORK.

 804 PM CDT   1 INCH HAIL AT THE SIOUX FALLS SD.  OBSERVED BY
              NWS EMPLOYEES AND REFLECTED ON OBSERVATIONS.
DEMORIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 8:15 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	60 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994 Every severe thunderstorm warning in 1994

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.