Alert archive / Wisconsin / Tornado Warnings in 2009
Tornado Warning 41, NWS Twin Cities, MN
NWS Twin Cities, MN issued this tornado warning at Aug 19, 2009, 2:57 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 48 min. 1 report 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
- Aug 19, 2009, 2:57 PM CDT (19:57 UTC)
- Expired
- Aug 19, 2009, 3:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
Counties Pierce County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 88 km from the middle of the area, began a volume at 19:58 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 |
|---|---|---|---|
| Aug 19, 2:57 PM CDT | TORNADO | 5 Se Ellsworth, WI | DAMAGE SURVEY DETERMINED AN EF-0 TORNADO TOUCHED DOWN BRIEFLY JUST NORTH OF THE INTERSECTION OF COUNTY ROADS DD AND V. THE TORNADO KNOCKED DOWN A NARROW STRIP OF CORN FOR 0.2 MILE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 8.0 hours before the alert went out and 91 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
- 368 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 615 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WFUS53 KMPX 191957
TORMPX
WIC093-109-192045-
/O.NEW.KMPX.TO.W.0041.090819T1957Z-090819T2045Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
257 PM CDT WED AUG 19 2009
THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...
PIERCE COUNTY IN WEST CENTRAL WISCONSIN...
* UNTIL 345 PM CDT
* AT 257 PM CDT...RADAR INDICATED A STORM CAPABLE OF PRODUCING A
TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS 3 MILES SOUTHEAST
OF ELLSWORTH...OR ABOUT 6 MILES SOUTHEAST OF BELDENVILLE...AND
MOVING NORTH AT 30 MPH.
* LOCATIONS IN THE WARNING INCLUDE...
ELLSWORTH...
BELDENVILLE...
MARTEL...
SPRING VALLEY...
ROBERTS...
HAMMOND...
BALDWIN...
WOODVILLE...
HERSEY...
WILSON...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
&&
LAT...LON 4486 9252 4487 9267 4506 9256 4501 9214
4486 9214 4458 9237 4464 9263
TIME...MOT...LOC 1957Z 202DEG 28KT 4471 9244
$$1 follow-up statement
000
WWUS53 KMPX 192020
SVSMPX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
320 PM CDT WED AUG 19 2009
WIC093-109-192045-
/O.CON.KMPX.TO.W.0041.000000T0000Z-090819T2045Z/
ST. CROIX WI-PIERCE WI-
320 PM CDT WED AUG 19 2009
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM CDT FOR PIERCE
AND SOUTHERN ST. CROIX COUNTIES...
AT 319 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING A TORNADO. THE MOST DANGEROUS PART OF THE STORM
WAS LOCATED NEAR MARTEL...AND MOVING NORTH AT 30 MPH. ADDITIONAL
STRONG THUNDERSTORMS WERE LOCATED IN THE AREA...AND THEY COULD
PRODUCE A BRIEF TORNADO.
LOCATIONS IN THE WARNING INCLUDE...
SPRING VALLEY...ROBERTS...HAMMOND...BALDWIN...WOODVILLE...HERSEY AND
WILSON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
&&
LAT...LON 4458 9237 4464 9263 4486 9252 4492 9249
4497 9261 4506 9256 4501 9214 4486 9214
TIME...MOT...LOC 2019Z 198DEG 25KT 4484 9237
$$The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:43 PM CDT | Tornado Warning | MPX | Pierce | 32 min |
| Aug 19, 2:53 PM CDT | Tornado Warning | MPX | Saint Croix | 22 min |
| Aug 19, 3:16 PM CDT | Tornado Warning | MPX | Polk, Saint Croix | 29 min |
| Aug 19, 4:04 PM CDT | Tornado Warning | MPX | Dunn, Saint Croix | 26 min |
| Aug 19, 4:06 PM CDT | Tornado Warning | MPX | Pierce, Saint Croix | 39 min |
| Aug 19, 4:14 PM CDT | Tornado Warning | MPX | Barron, Polk | 46 min |
| Aug 19, 4:21 PM CDT | Tornado Warning | MPX | Polk | 39 min |
| Aug 19, 4:33 PM CDT | Tornado Warning | MPX | Saint Croix | 27 min |
| Aug 19, 4:43 PM CDT | Tornado Warning | MPX | Dunn, Pierce, Saint Croix | 47 min |
| Aug 19, 5:13 PM CDT | Tornado Warning | MPX | Barron, Dunn, Polk, Saint Croix | 47 min |
Nearby
Tornado Warnings in Wisconsin, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.