Alert archive / Iowa / Tornado Warnings in 2004
Tornado Warning 1, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at Apr 17, 2004, 9:41 PM CDT for Floyd County, Iowa. It was in force for 64 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 17, 2004, 9:41 PM CDT (02:41 UTC)
- Expired
- Apr 17, 2004, 10:45 PM CDT
- In force
- 64 min
- Issued by
- NWS La Crosse, WI
- Area
- Counties, with a storm outline in the text
County Floyd County, IA
The radar
The La Crosse radar (KARX), 162 km from the middle of the area, began a volume at 02:40 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 17, 9:54 PM CDT | HAIL 1.25 | Rock Falls, IA | |
| Apr 17, 9:55 PM CDT | HAIL 1.25 | Rock Falls, IA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 2.7 hours before the alert went out and 203 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.
956 WFUS53 KARX 180241 TORARX IAC067-180345- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 941 PM CDT SAT APR 17 2004 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * TORNADO WARNING FOR... FLOYD COUNTY IN NORTH CENTRAL IOWA * UNTIL 1045 PM CDT * AT 941 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A TORNADO 4 MILES NORTHWEST OF NORA SPRINGS...OR ABOUT 6 MILES EAST OF MASON CITY. THE TORNADO WAS MOVING SOUTHEAST AT 40 MPH. * THE TORNADO WILL BE NEAR... COUNTY ROADS B 20 AND T 26 BY 950 PM CDT... RUDD AND ROCKFORD BY 955 PM CDT... OAKWOOD AND ROSEVILLE BY 1005 PM CDT... HIGHWAY 14 AND COUNTY ROAD B 60 AND CHARLES CITY BY 1010 PM CDT... COUNTY ROADS B 60 AND T 64 AND POWERSVILLE BY 1015 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 4325 9311 4308 9326 4282 9256 4305 9256 $$ KRC
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 9:44 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, 10:49 PM CDT | Tornado Warning | ARX | Mitchell | 56 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.