Alert archive / Iowa / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 113, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 18, 1994, 6:46 PM CDT for Osceola County, Iowa. It was in force for 37 min.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1994, 6:46 PM CDT (23:46 UTC)
- Expired
- Jul 18, 1994, 7:23 PM CDT
- In force
- 37 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Osceola County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 12:00Z, 11.8 hours before the alert went out and 230 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1309 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 182347 RRA SVRFSD IAC143-190045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 646 PM CDT MON JUL 18 1994 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHWEST IOWA ...OSCEOLA COUNTY AT 645 PM CDT WEATHER RADAR INDICATED THAT A SEVERE THUNDERSTORM WAS APPROACHING NORTHWEST OSCEOLA COUNTY FROM MINNESOTA. THE STORM WAS MOVING SOUTHEAST AT 25 MILES AN HOUR...AND WILL MOVE OVER THE NORTHERN PORTION OF THE COUNTY BY 655 PM CDT. THE STORM WILL REACH THE THE COMMUNITIES OF SIBLEY BY 710 PM AND MELVIN BY 730 PM CDT. THIS IS A DANGEROUS STORM. IF YOR ARE IN ITS PATH...PREPARE IMMEDIATELY FOR WINDS IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...AND DEADLY LIGHTNING. MENTZER
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 18, 5:18 PM CDT, 1 hour 28 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-182315- SPECIAL WEATHER STATEMENT...ADDED UNION COUNTY NATIONAL WEATHER SERVICE SIOUX CITY IA 518 PM CDT MON JUL 18 1994 ...SCATTERED THUNDERSTORMS WILL BE NORTHEAST OF SIOUX CITY... AT 506 PM CDT SEVERE THUNDERSTORMS WERE LOCATED IN EXTREME SOUTHWEST MINNESOTA. MOVEMENT OF THE STORMS WAS SOUTHEAST AT 30 MILES AN HOUR. THESE STORMS WILL BE NORTHEAST OF SIOUX CITY AND COULD CLIP OBRIEN COUNTY BETWEEN 6 AND 630 PM. PEOPLE IN OBRIEN COUNTY SHOULD BE ON THE LOOKOUT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND LISTEN FOR LATER WEATHER STATEMENTS. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY...AND IDA COUNTIES IN NORTHWEST IOWA. UNION COUNTY IN SOUTH DAKOTA IS ALSO UNDER THE SEVERE THUNDERSTORM WATCH. MICHELS
Special weather statement, Jul 18, 5:19 PM CDT, 1 hour 27 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-182315- SPECIAL WEATHER STATEMENT...ADDED UNION COUNTY NATIONAL WEATHER SERVICE SIOUX CITY IA 518 PM CDT MON JUL 18 1994 ...SCATTERED THUNDERSTORMS WILL BE NORTHEAST OF SIOUX CITY... AT 506 PM CDT SEVERE THUNDERSTORMS WERE LOCATED IN EXTREME SOUTHWEST MINNESOTA. MOVEMENT OF THE STORMS WAS SOUTHEAST AT 30 MILES AN HOUR. THESE STORMS WILL BE NORTHEAST OF SIOUX CITY AND COULD CLIP OBRIEN COUNTY BETWEEN 6 AND 630 PM. PEOPLE IN OBRIEN COUNTY SHOULD BE ON THE LOOKOUT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND LISTEN FOR LATER WEATHER STATEMENTS. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY...AND IDA COUNTIES IN NORTHWEST IOWA. UNION COUNTY IN SOUTH DAKOTA IS ALSO UNDER THE SEVERE THUNDERSTORM WATCH. MICHELS
Special weather statement, Jul 18, 5:45 PM CDT, 1 hour 1 minute before
SDZ033>037-045-048-051>052-182345
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HURON SD
545 PM CDT MON JUL 18 1994
...TORNADO WATCH FOR NORTH CENTRAL...CENTRAL AND SOUTH CENTRAL
SOUTH DAKOTA UNTIL 10 PM CDT...
AT 545 PM CDT...VERY STRONG THUNDERSTORMS ARE BEGINNING TO MOVE INTO
PARTS OF NORTHCENTRAL...CENTRAL AND SOUTH CENTRAL SOUTH DAKOTA.
THE THUNDERSTORMS ARE MOVING TO THE EAST AT 25 MILES AN HOUR.
THESE STORMS CAN BE EXPECTED TO CONTAIN VERY HEAVY RAIN...SMALL HAIL
AND STRONG GUSTY WINDS. RESIDENTS ARE URGED TO BE PREPARED FOR
POSSIBLE SEVERE WEATHER.
MILLERSpecial weather statement, Jul 18, 5:52 PM CDT, 54 minutes before
SDZ033>037-045-048-051>052-182345
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HURON SD
545 PM CDT MON JUL 18 1994
...TORNADO WATCH FOR NORTH CENTRAL...CENTRAL AND SOUTH CENTRAL
SOUTH DAKOTA UNTIL 10 PM CDT...
AT 545 PM CDT...VERY STRONG THUNDERSTORMS ARE BEGINNING TO MOVE INTO
PARTS OF NORTHCENTRAL...CENTRAL AND SOUTH CENTRAL SOUTH DAKOTA.
THE THUNDERSTORMS ARE MOVING TO THE EAST AT 25 MILES AN HOUR.
THESE STORMS CAN BE EXPECTED TO CONTAIN VERY HEAVY RAIN...SMALL HAIL
AND STRONG GUSTY WINDS. RESIDENTS ARE URGED TO BE PREPARED FOR
POSSIBLE SEVERE WEATHER.
MILLERSpecial weather statement, Jul 18, 6:24 PM CDT, 22 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-190030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 624 PM CDT MON JUL 18 1994 ...SCATTERED THUNDERSTORMS WILL BE NORTHEAST OF SIOUX CITY... AT 621 PM CDT SEVERE THUNDERSTORMS WERE IN EXTREME SOUTHWEST MINNESOTA NEAR WORTHINGTON MINNESOTA. MOVEMENT OF THE STORMS WAS SOUTHEAST AT 20 MILES AN HOUR. THESE STORMS WILL BE NORTHEAST OF SIOUX CITY AND COULD CLIP OBRIEN COUNTY BETWEEN 715 AND 745 PM CDT. PEOPLE IN OBRIEN COUNTY SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND SHOULD LISTEN FOR FURTHER STATEMENTS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM CDT FOR UNION COUNTY SOUTH DAKOTA. SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY...AND IDA COUNTIES IN NORTHWEST IOWA ARE ALSO UNDER THE SEVERE THUNDERSTORM WATCH UNTIL 9 PM. MICHELS
Special weather statement, Jul 18, 6:27 PM CDT, 19 minutes before
IAZ021-032-043-013-020-031-NEZ014-013-015-SDZ071-190030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 624 PM CDT MON JUL 18 1994 ...SCATTERED THUNDERSTORMS WILL BE NORTHEAST OF SIOUX CITY... AT 621 PM CDT SEVERE THUNDERSTORMS WERE IN EXTREME SOUTHWEST MINNESOTA NEAR WORTHINGTON MINNESOTA. MOVEMENT OF THE STORMS WAS SOUTHEAST AT 20 MILES AN HOUR. THESE STORMS WILL BE NORTHEAST OF SIOUX CITY AND COULD CLIP OBRIEN COUNTY BETWEEN 715 AND 745 PM CDT. PEOPLE IN OBRIEN COUNTY SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND SHOULD LISTEN FOR FURTHER STATEMENTS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM CDT FOR UNION COUNTY SOUTH DAKOTA. SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY...AND IDA COUNTIES IN NORTHWEST IOWA ARE ALSO UNDER THE SEVERE THUNDERSTORM WATCH UNTIL 9 PM. MICHELS
Nearby
Severe Thunderstorm Warnings in Iowa, 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.