Alert archive / Wisconsin / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 227
The Storm Prediction Center issued this severe thunderstorm watch at May 2, 2012, 7:47 PM CDT for 7 counties in Minnesota; 9 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 2, 2012, 7:47 PM CDT (00:47 UTC)
- Expired
- May 3, 2012, 1:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Clark County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 55 km from the middle of the area, began a volume at 00:51 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 8:10 PM CDT | Severe Thunderstorm Warning | ARX | Wabasha | 65 min |
| May 2, 8:48 PM CDT | Severe Thunderstorm Warning | ARX | Wabasha | 72 min |
| May 2, 8:51 PM CDT | Flash Flood Warning | ARX | Wabasha | 6 hr |
| May 2, 9:13 PM CDT | Severe Thunderstorm Warning | ARX | Wabasha | 17 min |
| May 2, 9:19 PM CDT | Severe Thunderstorm Warning | ARX | Wabasha, Winona | 56 min |
| May 2, 9:23 PM CDT | Severe Thunderstorm Warning | ARX | Trempealeau | 67 min |
| May 2, 9:33 PM CDT | Tornado Warning | ARX | Wabasha | 27 min |
| May 2, 9:53 PM CDT | Severe Thunderstorm Warning | ARX | Trempealeau | 52 min |
| May 2, 10:26 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 30 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.8 hours before the alert went out and 174 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
- 84 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1937 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 7:20 PM CDT | Mesoscale Discussion | SPC | Big Stone, Clay, Grant, Traverse, Wilkin | 55 min |
| May 2, 7:38 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 16 more | 37 min |
| May 2, 9:18 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Faribault, Freeborn, Goodhue and 10 more | 27 min |
| May 2, 11:06 PM CDT | Mesoscale Discussion | SPC | Anoka, Big Stone, Carver, Chippewa, Dakota, Hennepin and 17 more | 24 min |
| May 3, 8:43 AM CDT | Mesoscale Discussion | SPC | Dakota, Dodge, Goodhue, Olmsted, Rice, Steele and 2 more | 92 min |
| May 2, 11:51 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Clark, Columbia, Dodge and 20 more | 54 min |
| May 3, 10:34 AM CDT | Mesoscale Discussion | SPC | Calumet, Dane, Dodge, Fond du Lac, Green Lake, Jefferson and 8 more | 86 min |
| May 3, 1:07 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Dane, Dodge, Green, Jefferson, Kenosha and 7 more | 6 hr |
| May 3, 2:53 PM CDT | Mesoscale Discussion | SPC | Columbia, Dane, Dodge, Jefferson, Kenosha, Milwaukee and 5 more | 67 min |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2012Severe Thunderstorm Watches in Minnesota, 2012Every severe thunderstorm watch in 2012
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.