Alert archive / Iowa / Tornado Warnings in 2009
Tornado Warning 28, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at Aug 19, 2009, 5:20 PM CDT for Allamakee County, Iowa. It was in force for 31 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
- Aug 19, 2009, 5:20 PM CDT (22:20 UTC)
- Expired
- Aug 19, 2009, 5:51 PM CDT
- In force
- 31 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
County Allamakee County, IA
The radar
The La Crosse radar (KARX), 53 km from the middle of the area, began a volume at 22:20 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 |
|---|---|---|---|
| Aug 19, 4:49 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 202 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
- 74 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WFUS53 KARX 192220
TORARX
IAC005-192315-
/O.NEW.KARX.TO.W.0028.090819T2220Z-090819T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
520 PM CDT WED AUG 19 2009
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* TORNADO WARNING FOR...
ALLAMAKEE COUNTY IN NORTHEAST IOWA...
* UNTIL 615 PM CDT
* AT 517 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM WITH A POSSIBLE TORNADO 5 MILES SOUTH OF
WAUKON...MOVING NORTHEAST AT 20 MPH. THIS STORM PRODUCED A TORNADO
NEAR WEST UNION AND CONTINUES TO SHOW THE POTENTIAL FOR ANOTHER
TORNADO.
* THE TORNADO WILL BE NEAR...
MAUD AROUND 525 PM...
ELON AND DALBY AROUND 540 PM...
CHURCHTOWN AROUND 545 PM...
LANSING AND RED BARN CAMPGROUND AROUND 600 PM...
THIS REPLACES THE PREVIOUS TORNADO WARNING FOR ALLAMAKEE COUNTY. THE
STORM IS INTENSIFYING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR
AND STAY AWAY FROM WINDOWS
A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT THURSDAY MORNING FOR
NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.
&&
LAT...LON 4322 9152 4351 9126 4350 9123 4345 9124
4342 9120 4338 9121 4335 9117 4332 9109
4331 9108 4317 9145
TIME...MOT...LOC 2218Z 227DEG 19KT 4321 9145
$$
BAUMGARDT1 follow-up statement
000
WWUS53 KARX 192251
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
551 PM CDT WED AUG 19 2009
IAC005-192258-
/O.CAN.KARX.TO.W.0028.000000T0000Z-090819T2315Z/
ALLAMAKEE IA-
551 PM CDT WED AUG 19 2009
...THE TORNADO WARNING FOR ALLAMAKEE COUNTY IS CANCELLED...
THE STORM WHICH PROMPTED THIS WARNING NO LONGER APPEARS CAPABLE OF
PRODUCING A TORNADO. HEAVY RAIN IS FALLING IN ALLAMAKEE COUNTY FROM
SOUTHWEST TO NORTHEAST. IT IS LIKELY THAT 1 TO 2 INCHES OF RAIN HAS
FALLEN THERE.
A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT THURSDAY MORNING
FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND WESTERN WISCONSIN.
LAT...LON 4322 9152 4351 9126 4350 9123 4345 9124
4342 9120 4338 9121 4335 9117 4332 9109
4331 9108 4317 9145
TIME...MOT...LOC 2248Z 227DEG 19KT 4332 9129
$$
BAUMGARDTThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 3:33 PM CDT | Tornado Warning | ARX | Fayette | 42 min |
| Aug 19, 3:43 PM CDT | Tornado Warning | ARX | Winneshiek | 62 min |
| Aug 19, 4:15 PM CDT | Tornado Warning | ARX | Fayette | 30 min |
| Aug 19, 4:26 PM CDT | Tornado Warning | ARX | Allamakee | 49 min |
| Aug 19, 4:38 PM CDT | Tornado Warning | ARX | Clayton, Fayette | 52 min |
| Aug 19, 5:59 PM CDT | Areal Flood Advisory | ARX | Allamakee | 47 min |
Nearby
Tornado Warnings in Iowa, 2009Every tornado warning in 2009Tornadoes in 2009
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.