Alert archive / Wisconsin / Tornado Warnings in 2007
Tornado Warning 40, NWS Twin Cities, MN
NWS Twin Cities, MN issued this tornado warning at Sep 20, 2007, 6:56 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 34 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
- Sep 20, 2007, 6:56 PM CDT (23:56 UTC)
- Expired
- Sep 20, 2007, 7:30 PM CDT
- In force
- 34 min
- Issued by
- NWS Twin Cities, MN
- Area
- Counties, with a storm outline in the text
Counties Pierce County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 92 km from the middle of the area, began a volume at 23:57 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 |
|---|---|---|---|
| Sep 20, 7:17 PM CDT | FUNNEL CLOUD | 3 Nw Ellsworth, WI |
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 |
|---|---|---|---|
| Sep 20, 5:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 95 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
- 1024 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 291 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 KMPX 202356 TORMPX WIC093-109-210030- /O.NEW.KMPX.TO.W.0040.070920T2356Z-070921T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 656 PM CDT THU SEP 20 2007 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * TORNADO WARNING FOR... ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN... PIERCE COUNTY IN WEST CENTRAL WISCONSIN... * UNTIL 730 PM CDT * AT 652 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD NEAR RIVER FALLS...OR ABOUT 11 MILES SOUTHEAST OF HUDSON. RADAR SHOWED THE SEVERE STORM ..AND MOVING EAST AT 40 MPH. RADAR ALSO INDICATED ROTATION IN THE STORM. * LOCATIONS IMPACTED INCLUDE... BELDENVILLE... MARTEL... WOODVILLE... SPRING VALLEY... THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. LAT...LON 4496 9217 4475 9219 4476 9273 4492 9274 TIME...MOT...LOC 2356Z 264DEG 37KT 4485 9253 $$ DWE
1 follow-up statement
000 WWUS53 KMPX 210028 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 724 PM CDT THU SEP 20 2007 WIC093-109-210034- /O.EXP.KMPX.TO.W.0040.000000T0000Z-070921T0030Z/ ST. CROIX WI-PIERCE WI- 724 PM CDT THU SEP 20 2007 ...THE TORNADO WARNING FOR PIERCE AND ST. CROIX COUNTIES EXPIRES AT 730 PM CDT... AT 715 PM CDT...A FUNNEL CLOUD WAS REPORTED 3 TO 4 MILES NORTHWEST OF ELLSWORTH. THE SEVERE STORM HAS WEAKENED...BUT COULD STILL PRODUCE HAIL. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT THURSDAY EVENING FOR SOUTHERN MINNESOTA. LAT...LON 4496 9217 4475 9219 4476 9273 4492 9274 TIME...MOT...LOC 0024Z 264DEG 37KT 4488 9213 $$
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 1:04 PM CDT | Flash Flood Watch | MPX | Pierce, Polk, Saint Croix | 18 hr |
| Sep 20, 6:07 PM CDT | Severe Thunderstorm Warning | MPX | Pierce, Saint Croix | 53 min |
Nearby
Tornado Warnings in Wisconsin, 2007Every tornado warning in 2007Tornadoes in 2007
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.