Alert archive / Iowa / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 93, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 1994, 10:43 PM CDT for Plymouth County, Iowa. It was in force for 47 min.
The area
The counties it named.
The facts
- Issued
- Jul 5, 1994, 10:43 PM CDT (03:43 UTC)
- Expired
- Jul 5, 1994, 11:30 PM CDT
- In force
- 47 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, 3.7 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.
- 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 TTAA00 KSUX 060343 SVRSUX IAC149-060430- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA 1043 PM CDT TUE JUL 5 1994 THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHWEST IOWA ...EASTERN PLYMOUTH COUNTY AT 1039 PM CDT 60 TO 70 MILE AN HOUR WIND WAS REPORTED 3 MILES SOUTHEAST OF LEMARS...25 MILES NORTHEAST OF SIOUX CITY. MOVEMENT WAS NORTHEAST AT 15 MILES AN HOUR. THIS SEVERE THUNDERSTORM WILL AFFECT THE TOWNS OF OYENS AND REMSEN BETWEEN 1000 PM AND 1010. 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. HUMPHREY &
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, 37 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
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, 11:21 PM CDT | Severe Thunderstorm Warning | FSD | Monona, Woodbury | 54 min |
| Jul 6, 12:14 AM CDT | Severe Thunderstorm Warning | FSD | Monona | 46 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.