Alert archive / Iowa / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 76, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 30, 1994, 11:12 PM CDT for O'Brien County, Iowa. It was in force for 63 min.
The area
The counties it named.
The facts
- Issued
- Jun 30, 1994, 11:12 PM CDT (04:12 UTC)
- Expired
- Jul 1, 1994, 12:15 AM CDT
- In force
- 63 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County O'Brien County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.2 hours before the alert went out and 206 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
- 2247 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1586 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS1 KSUX 010413 RRA SVRSUX IAC141-010515- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA 1112 PM CDT THU JUN 30 1994 THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHWEST IOWA ...OBRIEN COUNTY AT 1111 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 65 MILES NORTHEAST OF SIOUX CITY OR JUST NORTH OF SHELDON IOWA. MOVEMENT WAS SOUTHEAST AT 25 MILES AN HOUR. THE THUNDERSTORM WILL MOVE NEAR PRIMGHAR IOWA BETWEEN 1145 PM AND MIDNIGHT. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITHOUT WARNING. IF A TORNADO IS SIGHTED GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR. ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING OR GET INTO A DITCH OR DEPRESSION...COVER YOUR HEAD WITH HOPPES
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 30, 8:55 PM CDT, 2 hours 17 minutes before
MNZ080-081-089-090-010400Z- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 845 PM CDT THU JUN 30 1994 ...SEVERE THUNDERSTORM WATCH SOUTHWEST MINNESOTA UNTIL 11 PM... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR SOUTHWEST MINNESOTA COUNTIES OF COTTONWOOD...MURRAY...NOBLES AND JACKSON UNTIL 11PM THIS THURSDAY EVENING. AT 830 PM A LINE OF THUNDERSTORMS WAS BEGINNING TO DEVELOP 10 MILES EAST OF PIPESTONE TO 25 MILES SOUTH OF REDWOOD FALLS. THESE THUNDERSTORMS ARE EXPECTED TO MOVE SOUTHEAST. LARGE HAIL...DAMAGING WINDS...PERIODS OF VERY HEAVY RAIN AND DANGEROUS CLOUD TO GROUND LIGHTNING ARE POSSIBLE WITH THESE THUNDERSTORMS AS THEY CONTINUE TO DEVELOP. RESIDENTS IN AREAS AROUND SLAYTON...FULDA...MOUNTAIN LAKE AND JEFFERS SHOULD BE PREPARED FOR THIS ADVERSE WEATHER. THE DEVELOPING THUNDERSTORMS SHOULD BE IN THESE AREAS BEFORE 930 PM. BLOOM BLOOM
Special weather statement, Jun 30, 9:50 PM CDT, 1 hour 22 minutes before
SDZ069-010330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 945 PM CDT THU JUN 30 1994 ...A STRONG THUNDERSTORM IN SOUTHEAST SOUTH DAKOTA... AT 935 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG THUNDERSTORM 10 MILES WEST OF YANKTON IN YANKTON COUNTY. THIS STORM WAS MOVING SOUTHEAST AT 20 MILES AN HOUR AND IS EXPECTED TO MOVE ACROSS INTO NEBRASKA BY 1030 PM CDT. AT 937 PM CDT QUARTER TO GOLF BALL SIZE HAIL WAS REPORTED 9 MILES WEST OF YANKTON. THE STORM HAS WEAKENED BUT MAY CONTINUE TO BRING BRIEF HEAVY RAIN...GUSTY WINDS...AND SMALL HAIL. IF YOU ARE IN THE PATH OF THIS STORM PLEASE TAKE SHELTER IN A REINFORCED SHELTER. MURTHA
Special weather statement, Jun 30, 10:25 PM CDT, 47 minutes before
IAZ013-020-021-031-032-043-010430- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1025 PM CDT THU JUN 30 1994 ...A TORNADO WATCH IS IN EFFECT FOR SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY AND IDA COUNTIES IN IOWA UNTIL 3 AM CDT... THUNDERSTORMS ACROSS SOUTHERN MINNESOTA ARE EXPECTED TO MOVE INTO NORTHERN OBRIEN COUNTY IOWA...60 TO 70 MILES NORTHEAST OF SIOUX CITY AFTER 11 PM. MOVEMENT WAS SOUTHEAST AT 20 MILES AN HOUR. OTHER THUNDERSTORMS WERE DEVELOPING 30 MILES NORTHWEST OF SIOUX CITY NEAR MASKELL NEBRASKA AT 1023 PM. REMEMBER...A TORNADO WATCH MEANS THAT TORNADOES ARE POSSIBLE IN AND NEAR THE WATCH AREA. LARGE HAIL AND DAMAGING WINDS MAY ALSO OCCUR. BE READY TO MOVE TO SHELTER IF A WARNING IS ISSUED FOR YOUR AREA. HOPPES
Special weather statement, Jun 30, 10:26 PM CDT, 46 minutes before
IAZ013-020-021-031-032-043-010430- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1025 PM CDT THU JUN 30 1994 ...A TORNADO WATCH IS IN EFFECT FOR SIOUX...OBRIEN...PLYMOUTH...CHEROKEE...WOODBURY AND IDA COUNTIES IN IOWA UNTIL 3 AM CDT... THUNDERSTORMS ACROSS SOUTHERN MINNESOTA ARE EXPECTED TO MOVE INTO NORTHERN OBRIEN COUNTY IOWA...60 TO 70 MILES NORTHEAST OF SIOUX CITY AFTER 11 PM. MOVEMENT WAS SOUTHEAST AT 20 MILES AN HOUR. OTHER THUNDERSTORMS WERE DEVELOPING 30 MILES NORTHWEST OF SIOUX CITY NEAR MASKELL NEBRASKA AT 1023 PM. REMEMBER...A TORNADO WATCH MEANS THAT TORNADOES ARE POSSIBLE IN AND NEAR THE WATCH AREA. LARGE HAIL AND DAMAGING WINDS MAY ALSO OCCUR. BE READY TO MOVE TO SHELTER IF A WARNING IS ISSUED FOR YOUR AREA. HOPPES
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 10:20 PM CDT | Severe Thunderstorm Warning | FSD | Osceola | 55 min |
| Jul 1, 12:17 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 21 min |
| Jul 1, 12:25 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 65 min |
| Jul 1, 1:26 AM CDT | Severe Thunderstorm Warning | FSD | Monona, Woodbury | 52 min |
| Jul 1, 1:26 AM CDT | Severe Thunderstorm Warning | FSD | Ida | 64 min |
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.