Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 80, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 8, 2009, 10:59 AM CDT for Dunn County, Saint Croix County, Wisconsin. It was in force for 46 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 8, 2009, 10:59 AM CDT (15:59 UTC)
- Expired
- Aug 8, 2009, 11:45 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), 118 km from the middle of the area, began a volume at 16:00 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 8, 11:05 AM CDT | HAIL 0.88 | 3 Se Cylon, WI | HAILED FOR ABOUT FIVE MINUTES. |
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, 4.0 hours before the alert went out and 120 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
- -296 J/kg
- Mixed-layer LCL
- 896 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 237 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS53 KMPX 081559
SVRMPX
WIC033-109-081645-
/O.NEW.KMPX.SV.W.0080.090808T1559Z-090808T1645Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1059 AM CDT SAT AUG 8 2009
THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...
NORTHWESTERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...
* UNTIL 1145 AM CDT
* AT 1057 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR CYLON...OR
ABOUT 9 MILES EAST OF NEW RICHMOND...AND MOVING EAST AT 35 MPH.
LOCATIONS IN THE WARNING INCLUDE...
EMERALD...
FOREST...
CONNORSVILLE...
RIDGELAND...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.
&&
LAT...LON 4521 9215 4521 9212 4521 9183 4508 9189
4505 9237 4516 9243
TIME...MOT...LOC 1559Z 249DEG 29KT 4510 9234
$$
MDB1 follow-up statement
000 WWUS53 KMPX 081631 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1131 AM CDT SAT AUG 8 2009 WIC109-081641- /O.CAN.KMPX.SV.W.0080.000000T0000Z-090808T1645Z/ ST. CROIX WI- 1131 AM CDT SAT AUG 8 2009 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CROIX COUNTY IS CANCELLED... RADAR INDICATED THAT THE SEVERE STORM HAD MOVED OUT OF THE WARNED AREA. THEREFORE...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. LAT...LON 4508 9205 4520 9206 4521 9183 4508 9189 TIME...MOT...LOC 1631Z 258DEG 28KT 4513 9199 $$ WIC033-081645- /O.CON.KMPX.SV.W.0080.000000T0000Z-090808T1645Z/ DUNN WI- 1131 AM CDT SAT AUG 8 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT FOR NORTH CENTRAL DUNN COUNTY... AT 1131 AM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM... CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE STORM WAS LOCATED 7 MILES SOUTHWEST OF RIDGELAND...OR ABOUT 5 MILES EAST OF CONNORSVILLE...AND MOVING EAST AT 35 MPH. LOCATIONS IN THE WARNING INCLUDE... RIDGELAND. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4508 9205 4520 9206 4521 9183 4508 9189 TIME...MOT...LOC 1631Z 258DEG 28KT 4513 9199 $$ MDB
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 12:24 AM CDT | Areal Flood Advisory | MPX | Pierce, Saint Croix | 3 hr |
| Aug 8, 12:28 AM CDT | Areal Flood Advisory | MPX | Pierce, Saint Croix | 3 hr |
| Aug 8, 2:03 AM CDT | Flash Flood Warning | MPX | Dunn, Eau Claire, Pepin, Pierce | 4 hr |
| Aug 8, 4:06 AM CDT | Flash Flood Watch | MPX | Chippewa, Dunn, Eau Claire, Pepin, Pierce, Saint Croix | 19 hr |
| Aug 8, 8:11 AM CDT | Special Weather Statement | MPX | Polk | 49 min |
| Aug 8, 8:37 AM CDT | Severe Thunderstorm Warning | MPX | Polk, Saint Croix | 38 min |
| Aug 8, 9:05 AM CDT | Special Weather Statement | MPX | Barron | 40 min |
| Aug 8, 10:18 AM CDT | Special Weather Statement | MPX | Chippewa | 42 min |
| Aug 8, 10:33 AM CDT | Special Weather Statement | MPX | Saint Croix | 57 min |
| Aug 8, 11:58 AM CDT | Special Weather Statement | MPX | Chippewa | 47 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2009Every severe thunderstorm warning 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.