Alert archive / Minnesota / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 121, NWS Sioux Falls, SD

August 7, 1994Jackson County, Nobles County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 7, 1994, 7:35 PM CDT for Jackson County, Nobles County, Minnesota. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Aug 7, 1994, 7:35 PM CDT (00:35 UTC)
Expired
Aug 7, 1994, 8:30 PM CDT
In force
55 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Jackson County, MN, Nobles County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 0.6 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1994-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2071 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, Minneapolis, MN at 00:00Z on 1994-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
2071 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
998 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Aug 7, 5:46 PM CDT, 1 hour 49 minutes before
IAZ013-020-021-031-032-043-NEZ013>015-SDZ071-031630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
546 PM CDT WED AUG 3 1994

...THUNDERSTORMS WILL MOVE INTO THE AREA BY MID EVENING...

SCATTERED THUNDERSTORMS THAT WERE IN NORTH CENTRAL NEBRASKA AND SOUTH
CENTRAL SOUTH DAKOTA WILL MOVE INTO THE AREA BY MIDDLE EVENING. THE
AREAS THAT WILL SEE THE THUNDERSTORMS FIRST WILL BE NORTH AND WEST OF
SIOUX CITY. THIS IS ALSO WHERE THE WATCH IS IN EFFECT.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR DIXON COUNTY
NEBRASKA...UNION COUNTY SOUTH DAKOTA...AND PLYMOUTH COUNTY IOWA. PEOPLE
IN THE WATCH AREA SHOULD KEEP AN EYE ON THE SKY AND LISTEN FOR LATER
WEATHER STATEMENTS AND POSSIBLE WARNINGS.

MICHELS
Special weather statement, Aug 7, 6:45 PM CDT, 50 minutes before
SDZ049-050-057-058-072345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
645 PM CDT SUN AUG 7 1994

...SEVERE THUNDERSTORM WATCH FOR TRIPP...GREGORY...BRULE...AND AURORA
COUNTIES CANCELED...

THE SEVERE THUNDERSTORM WATCH FOR TRIPP...GREGORY...BRULE...AND AURORA
COUNTIES OF SOUTHCENTRAL SOUTH DAKOTA HAS BEEN CANCELED AS OF 645 PM
CDT. SCATTERED THUNDERSHOWERS ARE STILL POSSIBLE IN THESE AREAS BUT
NO SEVERE WEATHER IS EXPECTED.

CONTINUE WATCH 704 FOR THE REMAINDER OF SOUTHEAST SOUTH DAKOTA.

KOSCIELSKI
Special weather statement, Aug 7, 6:47 PM CDT, 48 minutes before
SDZ049-050-057-058-072345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
645 PM CDT SUN AUG 7 1994

...SEVERE THUNDERSTORM WATCH FOR TRIPP...GREGORY...BRULE...AND AURORA
COUNTIES CANCELED...

THE SEVERE THUNDERSTORM WATCH FOR TRIPP...GREGORY...BRULE...AND AURORA
COUNTIES OF SOUTHCENTRAL SOUTH DAKOTA HAS BEEN CANCELED AS OF 645 PM
CDT. SCATTERED THUNDERSHOWERS ARE STILL POSSIBLE IN THESE AREAS BUT
NO SEVERE WEATHER IS EXPECTED.T

CONTINUE WATCH 704 FOR THE REMAINDER OF SOUTHEAST SOUTH DAKOTA.

KOSCIELSKI
Special weather statement, Aug 7, 7:03 PM CDT, 32 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-080100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
703 PM CDT SUN AUG 7 1994

...THUNDERSTORMS WILL MOVE INTO THE AREA BY MIDDLE EVENING...

SCATTERED THUNDERSTORMS THAT WERE DEVELOPING IN NORTH CENTRAL NEBRASKA
AND SOUTHEAST SOUTH DAKOTA WILL MOVE INTO THE AREA BY MIDDLE EVENING.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR DIXON COUNTY
NEBRASKA...UNION COUNTY SOUTH DAKOTA...AND PLYMOUTH COUNTY IOWA.
A SEVERE THUNDERSTORM WATCH IS ALSO IN EFFECT UNTIL 1 AM CDT FOR
OBRIEN...CHEROKEE...WOODBURY AND IDA COUNTIES IN IOWA.

PEOPLE IN THESE WATCH AREAS SHOULD KEEP THEIR EYE ON THE SKY AND LISTEN
FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

MICHELS
Special weather statement, Aug 7, 7:06 PM CDT, 29 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-080100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
703 PM CDT SUN AUG 7 1994

...THUNDERSTORMS WILL MOVE INTO THE AREA BY MIDDLE EVENING...

SCATTERED THUNDERSTORMS THAT WERE DEVELOPING IN NORTH CENTRAL NEBRASKA
AND SOUTHEAST SOUTH DAKOTA WILL MOVE INTO THE AREA BY MIDDLE EVENING.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR DIXON COUNTY
NEBRASKA...UNION COUNTY SOUTH DAKOTA...AND PLYMOUTH COUNTY IOWA.
A SEVERE THUNDERSTORM WATCH IS ALSO IN EFFECT UNTIL 1 AM CDT FOR
OBRIEN...CHEROKEE...WOODBURY AND IDA COUNTIES IN IOWA.

PEOPLE IN THESE WATCH AREAS SHOULD KEEP THEIR EYE ON THE SKY AND LISTEN
FOR LATER STATEMENTS AND POSSIBLE WARNINGS.

MICHELS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 8:49 PM CDTSevere Thunderstorm WarningFSDLyon, Osceola56 min
Aug 7, 9:14 PM CDTSevere Thunderstorm WarningFSDO'Brien46 min
Aug 7, 9:49 PM CDTSevere Thunderstorm WarningFSDSioux56 min
Aug 7, 10:01 PM CDTSevere Thunderstorm WarningFSDO'Brien29 min
Aug 7, 10:20 PM CDTSevere Thunderstorm WarningFSDCherokee40 min
Aug 7, 11:51 PM CDTSevere Thunderstorm WarningFSDMonona24 min
Aug 8, 12:17 AM CDTTornado WarningFSDMonona28 min
Aug 7, 7:40 PM CDTSevere Thunderstorm WarningFSDTurner35 min
Aug 7, 7:47 PM CDTTornado WarningFSDNobles24 min
Aug 7, 8:36 PM CDTSevere Thunderstorm WarningFSDNobles39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1994Every 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.