Alert archive / Iowa / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 97, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 6, 1994, 12:14 AM CDT for Monona County, Iowa. It was in force for 46 min.
The area
The counties it named.
The facts
- Issued
- Jul 6, 1994, 12:14 AM CDT (05:14 UTC)
- Expired
- Jul 6, 1994, 1:00 AM CDT
- In force
- 46 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Monona County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.2 hours before the alert went out and 88 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
- 3368 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1281 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 8.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS1 KSUX 060515 RRA SVRSUX IAC133-060600- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA 1214 AM CDT WED JUL 6 1994 THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 100 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL IOWA ...MONONA COUNTY AT 1214 AM CDT A SEVERE THUNDERSTORM WAS LOCATED 40 TO 50 MILES SOUTHEAST OF SIOUX CITY OR FROM MAPLETON TO BLENCOE IOWA. MOVEMENT WAS EAST AT 25 MILES AN HOUR. THIS STORM WILL REACH SOLDIER IOWA AROUND 1245 AM CDT. 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. MICHELS
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 5, 10:06 PM CDT, 2 hours 8 minutes before
SDZ068>070-060405- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1004 PM CDT TUE JUL 5 1994 ...A SEVERE THUNDERSTORM WATCH CONTINUED IN EFFECT UNTIL 2 AM CDT FOR THE EXTREME SOUTHEAST SOUTH DAKOTA COUNTIES ALONG THE MISSOURI RIVER... THUNDERSTORMS WERE MOVING NORTHEAST ACROSS UNION COUNTY SOUTH DAKOTA WITH THE POTENTIAL FOR SEVERE WEATHER. NO THUNDERSTORMS WERE OCCURRING FROM TYNDALL IN BON HOMME COUNTY ACROSS YANKTON COUNTY TO VERMILLION IN CLAY COUNTY. THE MOVEMENT OF THE STORMS MAKES IT APPEAR PROBABLE THAT THUNDERSTORMS WILL PASS THEM BY...BUT THE SEVERE THUNDERSTORM WATCH CONTINUES FOR NOW. UMLAND
Special weather statement, Jul 5, 10:45 PM CDT, 1 hour 29 minutes before
IAZ012-060445- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1042 PM CDT TUE JUL 5 1994 THE SEVERE THUNDERSTORM WARNING FOR SIOUX COUNTY IN NORTHWEST IOWA EXPIRED AT 1045 PM AND WILL NOT BE REISSUED AT THIS TIME. STRONG THUNDERSTORMS CONTINUED TO DEVELOP AND THEN DIMINISH IN INTENSITY AS THEY MOVED NORTHEAST AT 20 MPH ACROSS THE COUNTY. ONE OF THE STRONGEST STORMS AT 1040 PM WAS ABOUT 40 MILES SOUTHEAST OF SIOUX FALLS NEAR HAWARDEN IOWA. PEOPLE IN SIOUX COUNTY SHOULD KEEP IN MIND THAT A SEVERE THUNDERSTORM WATCH CONTINUES FOR NORTHWEST IOWA INCLUDING THEIR AREA THROUGH 2 AM. UMLAND
Special weather statement, Jul 5, 11:01 PM CDT, 1 hour 13 minutes before
SDZ068-069-060500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1059 PM CDT TUE JUL 5 1994 SEVERE THUNDERSTORM WATCH FOR EXTREME SOUTHEAST SOUTH DAKOTA ALONG THE MISSOURI RIVER HAS BEEN CANCELED FOR BON HOMME AND YANKTON COUNTY AREAS. THE SEVERE THAUNDERSTORM WATCH DOES CONTINUE IN EFEECT FOR CLAY AND UNION COUNTIES UNTIL 2 AM. THUNDERSTORMS CONTINUED TO MOVE ACROSS UNION COUNTY AND MAY YET BUILD BACK INTO CLAY COUNTY. THESE THUNDERSTORMS CONTINUE TO HAVE THE POTENTIAL TO PRODUCE SEVERE WEATHER. SOME OF THESE STORMS MAY CONTAIN SMALL HAIL...GUSTY WINDS...DEADLY LIGHTNING AND VERY HEAVY DOWNPOURS OF RAIN. UMLAND
Special weather statement, Jul 5, 11:46 PM CDT, 28 minutes before
SDZ070-IAZ001-060600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1150 PM CDT TUE JUL 5 1994 THE SEVERE THUNDERSTORM WATCH WHICH WAS IN EFFECT FOR THE EXTREME SOUTHEAST SOUTH DAKOT0A COUNTIES OF CLAY AND UNION HAS BEEN CANCELED. THERE ARE NO SEVERE THUNDERSTORM WATCHES IN EFFECT FOR ANY PART OF SOUTH DAKOTA AS OF 1145 PM CDT. UMLAND
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 7:59 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 46 min |
| Jul 5, 8:37 PM CDT | Tornado Warning | FSD | Woodbury | 38 min |
| Jul 5, 8:42 PM CDT | Tornado Warning | FSD | Woodbury | 33 min |
| Jul 5, 9:18 PM CDT | Tornado Warning | FSD | Woodbury | 27 min |
| Jul 5, 9:41 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 64 min |
| Jul 5, 9:47 PM CDT | Tornado Warning | FSD | Woodbury | 28 min |
| Jul 5, 10:16 PM CDT | Tornado Warning | FSD | Woodbury | 29 min |
| Jul 5, 10:43 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 47 min |
| Jul 5, 11:21 PM CDT | Severe Thunderstorm Warning | FSD | Monona, Woodbury | 54 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.