Alert archive / Wisconsin / Tornado Watches in 2017
Tornado Watch 377
The Storm Prediction Center issued this tornado watch at Jun 28, 2017, 5:14 PM CDT for 16 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 28, 2017, 5:14 PM CDT (22:14 UTC)
- Expired
- Jun 28, 2017, 9:09 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 80 km from the middle of the area, began a volume at 22:16 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 5:43 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 62 min |
| Jun 28, 6:14 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green | 46 min |
| Jun 28, 6:33 PM CDT | Tornado Warning | MKX | Dane, Green, Iowa, Lafayette | 42 min |
| Jun 28, 6:45 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 30 min |
| Jun 28, 6:57 PM CDT | Severe Thunderstorm Warning | MKX | Green, Rock | 33 min |
| Jun 28, 7:08 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson | 67 min |
| Jun 28, 7:11 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dodge | 34 min |
| Jun 28, 7:18 PM CDT | Flash Flood Warning | MKX | Lafayette | 3 hr |
| Jun 28, 7:22 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 38 min |
| Jun 28, 7:38 PM CDT | Tornado Warning | MKX | Rock | 22 min |
| Jun 28, 7:45 PM CDT | Severe Thunderstorm Warning | MKX | Waukesha | 45 min |
| Jun 28, 7:47 PM CDT | Severe Thunderstorm Warning | MKX | Walworth | 43 min |
| Jun 28, 8:26 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 34 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
Davenport, (KDVN), launched 12:00Z, 10.2 hours before the alert went out and 171 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
- 134 J/kg
- Mixed-layer CIN
- -204 J/kg
- Mixed-layer LCL
- 1152 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
551 WWUS20 KWNS 282211 SEL7 SPC WW 282211 WIZ000-290300- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 377 NWS Storm Prediction Center Norman OK 515 PM CDT Wed Jun 28 2017 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southern Wisconsin * Effective this Wednesday afternoon and evening from 515 PM until 1000 PM CDT. * Primary threats include... A couple tornadoes possible Isolated damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...A band of intense storms from northeast Iowa into far southwest Wisconsin will spread eastward into the evening with a threat to produce several tornadoes, strong wind gusts and possible hail. The tornado watch area is approximately along and 55 statute miles east and west of a line from 15 miles west southwest of Janesville WI to 35 miles north of Madison WI. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU7). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. && OTHER WATCH INFORMATION...CONTINUE...WW 375...WW 376... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 26030. ...Weiss
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 2:49 PM CDT | Mesoscale Discussion | SPC | Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 13 more | 116 min |
| Jun 28, 2:53 PM CDT | Tornado Watch | SPC | Grant | 9 hr |
| Jun 28, 4:09 PM CDT | Tornado Watch | SPC | Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 15 more | 6 hr |
| Jun 28, 5:00 PM CDT | Mesoscale Discussion | SPC | Columbia, Dane, Dodge, Green, Iowa, Jefferson and 3 more | 30 min |
| Jun 28, 5:29 PM CDT | Mesoscale Discussion | SPC | Grant, Lafayette | 91 min |
Nearby
Tornado Watches in Wisconsin, 2017Every tornado 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.