Alert archive / Wisconsin / Tornado Warnings in 2009
Tornado Warning 35, NWS Twin Cities, MN
NWS Twin Cities, MN issued this tornado warning at Aug 8, 2009, 11:14 PM CDT for Dunn County, Saint Croix County, Wisconsin. It was in force for 46 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 8, 2009, 11:14 PM CDT (04:14 UTC)
- Expired
- Aug 9, 2009, 12:00 AM CDT
- In force
- 46 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
Counties Dunn County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 125 km from the middle of the area, began a volume at 04:16 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 8, 3:46 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 4.2 hours before the alert went out and 127 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
- 3715 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 16.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS53 KMPX 090414 TORMPX WIC033-109-090500- /O.NEW.KMPX.TO.W.0035.090809T0414Z-090809T0500Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1114 PM CDT SAT AUG 8 2009 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN... NORTHERN AND CENTRAL DUNN COUNTY IN WEST CENTRAL WISCONSIN... * UNTIL MIDNIGHT CDT * AT 1113 PM CDT...RADAR WAS TRACKING A SEVERE STORM WITH STRONG ROTATION. THE MOST DANGEROUS PART OF THE STORM WAS 3 MILES SOUTH OF EMERALD...AND MOVING EAST AT 25 MPH. THIS STORM PRODUCED DAMAGE TWO MILES NORTH OF BURKHARDT IN ST CROIX COUNTY. * LOCATIONS IN THE WARNING INCLUDE... HERSEY... GLENWOOD CITY... WILSON... CONNORSVILLE... KNAPP... WHEELER... TAINTER LAKE... DOWNING... BOYCEVILLE... 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. && LAT...LON 4518 9181 4492 9183 4496 9231 4512 9231 TIME...MOT...LOC 0413Z 276DEG 21KT 4504 9226 $$
2 follow-up statements
000 WWUS53 KMPX 090435 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1135 PM CDT SAT AUG 8 2009 WIC033-109-090500- /O.CON.KMPX.TO.W.0035.000000T0000Z-090809T0500Z/ ST. CROIX WI-DUNN WI- 1135 PM CDT SAT AUG 8 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR CENTRAL DUNN AND EAST CENTRAL ST. CROIX COUNTIES... AT 1133 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION. THE MOST DANGEROUS PART OF THE STORM WAS LOCATED 3 MILES NORTHWEST OF KNAPP...AND MOVING EAST AT 25 MPH. LOCATIONS IN THE WARNING INCLUDE... KNAPP...WHEELER...TAINTER LAKE AND BOYCEVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS STORM HAS A HISTORY OR PRODUCING TORNADOES. && LAT...LON 4496 9221 4513 9215 4518 9181 4492 9183 TIME...MOT...LOC 0434Z 276DEG 21KT 4499 9211 $$
000 WWUS53 KMPX 090436 CCA SVSMPX SEVERE WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1136 PM CDT SAT AUG 8 2009 WIC033-109-090500- /O.CON.KMPX.TO.W.0035.000000T0000Z-090809T0500Z/ ST. CROIX WI-DUNN WI- 1136 PM CDT SAT AUG 8 2009 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR CENTRAL DUNN AND EAST CENTRAL ST. CROIX COUNTIES... AT 1133 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION. THE MOST DANGEROUS PART OF THE STORM WAS LOCATED 3 MILES NORTHWEST OF KNAPP...AND MOVING EAST AT 25 MPH. LOCATIONS IN THE WARNING INCLUDE... KNAPP...WHEELER...TAINTER LAKE AND BOYCEVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. && LAT...LON 4496 9221 4513 9215 4518 9181 4492 9183 TIME...MOT...LOC 0434Z 276DEG 21KT 4499 9211 $$
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 9:43 PM CDT | Tornado Warning | MPX | Polk, Saint Croix | 32 min |
| Aug 8, 10:01 PM CDT | Tornado Warning | MPX | Saint Croix | 29 min |
| Aug 8, 10:14 PM CDT | Tornado Warning | MPX | Polk, Saint Croix | 31 min |
| Aug 8, 10:29 PM CDT | Tornado Warning | MPX | Saint Croix | 46 min |
| Aug 9, 12:00 AM CDT | Tornado Warning | MPX | Dunn | 30 min |
| Aug 9, 12:36 AM CDT | Special Weather Statement | MPX | Chippewa, Eau Claire | 54 min |
| Aug 9, 1:27 AM CDT | Special Weather Statement | MPX | Chippewa | 33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.