Alert archive / Wisconsin / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 411
The Storm Prediction Center issued this severe thunderstorm watch at Jul 12, 2017, 3:33 PM CDT for 24 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 12, 2017, 3:33 PM CDT (20:33 UTC)
- Expired
- Jul 12, 2017, 10:32 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 24 counties
Brown County, WI, Calumet County, WI, Clark County, WI, Florence County, WI, Forest County, WI, Jackson County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Shawano 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), 172 km from the middle of the area, began a volume at 20:35 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
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 4:53 PM CDT | Severe Thunderstorm Warning | GRB | Vilas | 37 min |
| Jul 12, 5:19 PM CDT | Severe Thunderstorm Warning | GRB | Forest, Vilas | 41 min |
| Jul 12, 5:24 PM CDT | Severe Thunderstorm Warning | GRB | Forest, Oneida, Vilas | 51 min |
| Jul 12, 6:27 PM CDT | Severe Thunderstorm Warning | GRB | Florence, Forest, Marinette | 48 min |
| Jul 12, 7:16 PM CDT | Severe Thunderstorm Warning | GRB | Forest, Marinette | 23 min |
| Jul 12, 8:10 PM CDT | Severe Thunderstorm Warning | GRB | Waushara | 50 min |
| Jul 12, 8:27 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 28 min |
| Jul 12, 8:31 PM CDT | Severe Thunderstorm Warning | GRB | Marinette | 44 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 12:00Z, 8.6 hours before the alert went out and 298 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
- 93 J/kg
- Mixed-layer CIN
- -377 J/kg
- Mixed-layer LCL
- 1288 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 8:33 AM CDT | Mesoscale Discussion | SPC | Berrien, Branch, Calhoun, Cass, Hillsdale, Kalamazoo and 2 more | 117 min |
| Jul 11, 9:49 PM CDT | Mesoscale Discussion | SPC | Crawford, Dane, Grant, Green, Iowa, Lafayette and 5 more | 116 min |
| Jul 11, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | Barron, Chippewa, Dunn, Eau Claire, Polk, Rusk and 1 more | 6 hr |
| Jul 12, 1:49 AM CDT | Mesoscale Discussion | SPC | Adams, Barron, Buffalo, Burnett, Chippewa, Clark and 23 more | 2 hr |
| Jul 12, 3:56 AM CDT | Mesoscale Discussion | SPC | Chippewa, Clark, Eau Claire, Jackson, Langlade, Lincoln and 6 more | 3 hr |
| Jul 12, 2:53 PM CDT | Mesoscale Discussion | SPC | Adams, Clark, Eau Claire, Forest, Jackson, Juneau and 16 more | 97 min |
| Jul 12, 6:19 PM CDT | Mesoscale Discussion | SPC | Adams, Crawford, Forest, Juneau, Langlade, Marathon and 11 more | 86 min |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2017Every severe thunderstorm watch in 2017
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.