Alert archive / Wisconsin / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 228
The Storm Prediction Center issued this severe thunderstorm watch at May 16, 2017, 9:47 PM CDT for 20 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 16, 2017, 9:47 PM CDT (02:47 UTC)
- Expired
- May 17, 2017, 2:19 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Adams County, WI, Buffalo County, WI, Clark County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Portage County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Waupaca County, WI, Waushara County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 02:49 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- 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
- 80%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 9:57 PM CDT | Severe Thunderstorm Warning | ARX | Clark, Jackson | 93 min |
| May 17, 12:04 AM CDT | Flash Flood Warning | ARX | Buffalo, Jackson, Trempealeau | 116 min |
| May 17, 12:08 AM CDT | Severe Thunderstorm Warning | ARX | Jackson, La Crosse, Trempealeau | 37 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 00:00Z, 2.8 hours before the alert went out and 149 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
- 234 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 1926 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 8:46 PM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Freeborn, Houston, Mower, Olmsted and 2 more | 5 hr |
| May 16, 9:14 PM CDT | Mesoscale Discussion | SPC | Wabasha | 61 min |
| May 16, 11:48 PM CDT | Mesoscale Discussion | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Steele and 2 more | 117 min |
| May 17, 12:23 PM CDT | Mesoscale Discussion | SPC | Houston, Winona | 97 min |
| May 17, 2:38 PM CDT | Mesoscale Discussion | SPC | Dakota, Dodge, Fillmore, Freeborn, Goodhue, Houston and 7 more | 97 min |
| May 17, 2:53 PM CDT | Tornado Watch | SPC | Blue Earth, Brown, Cottonwood, Dakota, Faribault, Freeborn and 16 more | 6 hr |
| May 17, 3:13 PM CDT | Tornado Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 9 hr |
| May 17, 6:05 PM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Mower | 55 min |
| May 17, 6:31 PM CDT | Mesoscale Discussion | SPC | Adams, Chippewa, Clark, Columbia, Dodge, Eau Claire and 17 more | 89 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.