Alert archive / Wisconsin / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 406
The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2012, 1:24 PM EDT for 5 counties in Michigan; 35 counties in Wisconsin. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2012, 1:24 PM EDT (17:24 UTC)
- Expired
- Jun 18, 2012, 9:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 40 counties
Delta County, MI, Dickinson County, MI, Iron County, MI, Menominee County, MI, Schoolcraft County, MI, Adams County, WI, Brown County, WI, Buffalo County, WI, Calumet County, WI, Clark County, WI, Door County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Jackson County, WI, Juneau County, WI, Kewaunee County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Sheboygan County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 108 km from the middle of the area, began a volume at 17:27 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
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 1:25 PM EDT | Severe Thunderstorm Warning | MQT | Delta, Schoolcraft | 65 min |
| Jun 18, 2:29 PM EDT | Severe Thunderstorm Warning | ARX | Taylor | 31 min |
| Jun 18, 2:34 PM EDT | Severe Thunderstorm Warning | GRB | Langlade, Lincoln, Oneida | 56 min |
| Jun 18, 3:08 PM EDT | Severe Thunderstorm Warning | MQT | Delta, Menominee | 52 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | ARX | Clark | 46 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | GRB | Lincoln, Marathon | 46 min |
| Jun 18, 3:28 PM EDT | Severe Thunderstorm Warning | GRB | Forest, Langlade, Lincoln, Oconto | 47 min |
| Jun 18, 3:45 PM EDT | Severe Thunderstorm Warning | MQT | Delta, Schoolcraft | 45 min |
| Jun 18, 3:58 PM EDT | Severe Thunderstorm Warning | GRB | Marathon | 47 min |
| Jun 18, 4:22 PM EDT | Tornado Warning | GRB | Marathon | 23 min |
| Jun 18, 4:28 PM EDT | Severe Thunderstorm Warning | GRB | Menominee, Portage, Shawano, Waupaca | 47 min |
| Jun 18, 4:41 PM EDT | Tornado Warning | GRB | Langlade, Marathon, Menominee, Shawano | 34 min |
| Jun 18, 4:44 PM EDT | Severe Thunderstorm Warning | GRB | Marinette | 31 min |
| Jun 18, 4:46 PM EDT | Severe Thunderstorm Warning | MQT | Menominee | 44 min |
| Jun 18, 4:48 PM EDT | Severe Thunderstorm Warning | GRB | Marathon, Shawano | 42 min |
| Jun 18, 4:55 PM EDT | Severe Thunderstorm Warning | GRB | Outagamie, Portage, Shawano, Waupaca | 41 min |
| Jun 18, 4:58 PM EDT | Severe Thunderstorm Warning | GRB | Marinette, Oconto | 47 min |
| Jun 18, 5:07 PM EDT | Severe Thunderstorm Warning | GRB | Langlade, Menominee, Shawano | 20 min |
| Jun 18, 5:19 PM EDT | Tornado Warning | GRB | Marinette, Oconto | 26 min |
| Jun 18, 5:51 PM EDT | Severe Thunderstorm Warning | GRB | Calumet, Winnebago | 39 min |
| Jun 18, 6:30 PM EDT | Severe Thunderstorm Warning | GRB | Brown, Calumet, Manitowoc, Outagamie, Winnebago | 45 min |
| Jun 18, 7:08 PM EDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc, Winnebago | 37 min |
| Jun 18, 8:03 PM EDT | Severe Thunderstorm Warning | GRB | Manitowoc | 15 min |
| Jun 18, 8:31 PM EDT | Severe Thunderstorm Warning | GRB | Manitowoc | 21 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.4 hours before the alert went out and 109 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
- 67 J/kg
- Mixed-layer CIN
- -387 J/kg
- Mixed-layer LCL
- 1455 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 382 m²/s²
- 0-3 km storm-relative helicity
- 524 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 10:33 AM EDT | Mesoscale Discussion | SPC | Branch, Calhoun, Eaton, Genesee, Hillsdale, Ingham and 13 more | 2 hr |
| Jun 18, 12:40 PM EDT | Mesoscale Discussion | SPC | Delta, Menominee | 2 hr |
| Jun 18, 1:38 PM EDT | Mesoscale Discussion | SPC | Monroe | 67 min |
| Jun 18, 4:50 PM EDT | Mesoscale Discussion | SPC | Antrim, Benzie, Charlevoix, Cheboygan, Crawford, Emmet and 12 more | 85 min |
| Jun 18, 5:46 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Benzie, Charlevoix and 25 more | 6 hr |
| Jun 17, 8:27 PM EDT | Mesoscale Discussion | SPC | Pierce, Polk, Saint Croix | 93 min |
| Jun 17, 8:57 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Barron, Buffalo, Burnett, Chippewa, Clark and 21 more | 8 hr |
| Jun 17, 11:55 PM EDT | Mesoscale Discussion | SPC | Buffalo, La Crosse, Pierce, Trempealeau | 95 min |
| Jun 18, 2:28 AM EDT | Mesoscale Discussion | SPC | Adams, Buffalo, Chippewa, Clark, Columbia, Dunn and 22 more | 62 min |
| Jun 18, 3:49 PM EDT | Mesoscale Discussion | SPC | Brown, Calumet, Kewaunee, Marinette, Menominee, Oconto and 5 more | 86 min |
| Jun 18, 7:00 PM EDT | Mesoscale Discussion | SPC | Brown, Calumet, Door, Green Lake, Kewaunee, Manitowoc and 7 more | 60 min |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2012Severe Thunderstorm Watches in Michigan, 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.