Alert archive / Iowa / Tornado Warnings in 2004
Tornado Warning 4, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at Apr 17, 2004, 10:49 PM CDT for Mitchell County, Iowa. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2004, 10:49 PM CDT (03:49 UTC)
- Expired
- Apr 17, 2004, 11:45 PM CDT
- In force
- 56 min
- Issued by
- NWS La Crosse, WI
- Area
- Counties, with a storm outline in the text
County Mitchell County, IA
The radar
The La Crosse radar (KARX), 158 km from the middle of the area, began a volume at 03:50 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 17, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 17, 10:05 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 3.8 hours before the alert went out and 172 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
- 2026 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 489 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
849 WFUS53 KARX 180349 TORARX IAC131-180445- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 1050 PM CDT SAT APR 17 2004 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * TORNADO WARNING FOR... MITCHELL COUNTY IN NORTH CENTRAL IOWA * UNTIL 1145 PM CDT * AT 1050 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A TORNADO 9 MILES WEST OF CARPENTER...OR ABOUT 16 MILES NORTH OF MASON CITY. THE TORNADO WAS MOVING SOUTHEAST AT 30 MPH. * THE TORNADO WILL BE NEAR... CARPENTER BY 1055 PM CDT... STATE ROAD 9 AND COUNTY S 70 AND COUNTY ROADS A 39 AND S 70 BY 1105 PM CDT... STATE ROAD 9 AND COUNTY T 26 AND ROCK CREEK BY 1115 PM CDT... OSAGE SPRING PARK AND HIGHWAY 18 AND COUNTY T 38 BY 1120 PM CDT... OSAGE BY 1125 PM CDT... THIS STORM HAS A HISTORY OF PRODUCING A TORNADO TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS LAT...LON 4350 9320 4334 9334 4322 9293 4322 9257 $$ KRC
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 9:41 PM CDT | Tornado Warning | ARX | Floyd | 64 min |
| Apr 17, 9:44 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 61 min |
| Apr 17, 9:58 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 47 min |
| Apr 17, 10:36 PM CDT | Tornado Warning | ARX | Chickasaw | 69 min |
| Apr 17, 10:47 PM CDT | Tornado Warning | ARX | Floyd | 73 min |
| Apr 17, 10:52 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 23 min |
| Apr 17, 11:24 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 96 min |
| Apr 17, 11:37 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 83 min |
Nearby
Tornado Warnings in Iowa, 2004Every tornado warning in 2004Tornadoes in 2004
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; radar from the NEXRAD Level II archive.