An upper trough brought clusters of thunderstorms to southern WI. Some contained large hail and damaging winds.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MKX wrote it up.
An upper trough brought clusters of thunderstorms to southern WI. Some contained large hail and damaging winds.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Milwaukee, WI wrote its last area forecast discussion before the first event at Jun 19, 11:49 AM CST, 11 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Milwaukee/Sullivan WI 1249 PM CDT Mon Jun 19 2017 .UPDATE... Thunderstorms are moving across southern WI. The stronger storms north and west of Madison have brought some pea sized hail and wind gusts of 30-40 mph in Columbia county. Storms will continue to move east and additional scattered showers and storms are expected through the afternoon. && .AVIATION(18Z TAFS)... Thunderstorms are moving across southern WI and will impact southeast WI over the next couple hours. The stronger storms have brought pea sized hail and wind gusts around 35 mph. Additional scattered showers and storms may develop through the afternoon. Expect visibilities of 2-3 miles and ceilings around 2500ft within the thunderstorms. Activity will diminish this evening. Scattered showers and storms are possible on Tuesday. VFR conditions are expected, except within thunderstorms. && .PREV DISCUSSION... (Issued 1011 AM CDT Mon Jun 19 2017) UPDATE... Can see a trough axis over southwest WI on water vapor imagery. GOES LI values show a minimum over the region of -2 and cape will increase to around 500-1000 J/KG today. A few cells have developed upstream with some lightning and may hold together as they get into our NW forecast area. Scattered showers and thunderstorms are expected to develop later this morning with small hail the main threat. Activity will wind down during evening with the loss of daytime heating. MARINE... West winds will gust 15 to 20 knots. Otherwise low wave heights and lighter winds are expected through Wednesday morning. Scattered showers and thunderstorms are expected today. PREV DISCUSSION... (Issued 328 AM CDT Mon Jun 19 2017) SHORT TERM... Today and Tonight...Forecast Confidence is High. An upper trough will pass today and help cool 500 mb temps to -18C. Thus, tall and skinny CAPE is noted on forecast soundings with all models producing fairly widespread qpf. Thus expect showers and sct tstorms from late morning through the afternoon. Small hail will probably occur with the stronger cells. Clouds and rain will keep high temps around 70F. The upper trough will depart by this evening with another strong shortwave trough to arrive for Tue. Some clearing will occur tnt with low temps in the 50s. LONG TERM... Tuesday...Forecast confidence is medium to high: Another wave is expected to move through on Tuesday. Consensus of models suggests this wave will be clear of the area by mid to late afternoon, so have have peak pops from mid-morning through mid- afternoon. Kept small chance of thunder given some instability in models. Overall, models look a little stronger with this wave and are showing a bit more moisture than they did 24 hours ago. Should see highs a few degrees below normal given the expected clouds, showers, and temps aloft. Wednesday and Thursday...Forecast confidence is medium: The flow will turn more zonal mid-week, allowing a return of deeper moisture and warmer temps. Shower/storm chances will also increase during this time as moisture/instability and forcing increase with low pressure moving into the region. Models have slowed a bit with the arrival of the deeper moisture and better warm air advection, so Wednesday now looks mainly dry through the afternoon. Showers/storms are then likely Wed evening and overnight. Seeing more agreement among models now that the low level boundary could get hung up in the area, allowing further rounds of showers/storms on Thursday, especially in the south toward the boundary. Friday through Sunday...Forecast confidence is medium: It looks dry Friday as high pressure builds toward the area. Models struggle beyond that, with various strengths of the next approaching wave for the weekend and resultant surface low development. Have slight chance to chance pops through the weekend due to the uncertainty of timing and precip coverage. Overall though, it does seem likely that there will be precip at some point during the weekend. Models do agree that near normal temps Friday should drop to below normal values by Sunday. AVIATION(09Z TAFS)...Bkn035-040 cumulus congestus will develop by late morning and continue through the day with showers likely and sct tstorms. Areas of MVFR Cigs will be possible throughout the day. Reduced Cigs and Vsbys within any storms. Some clearing for tnt. MARINE...Modest wly winds will prevail today and Tue with wind gusts up to 20 kts. High pressure and light and variable winds are then expected for Tue nt-Wed AM. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Update...Marquardt Today/Tonight and Aviation/Marine...Gehring Tuesday THROUGH Sunday...DDV
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 1132 AM CDT Mon Jun 19 2017 WIZ046-047-051-052-056>060-062>072-201645- Marquette-Green Lake-Fond Du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 1132 AM CDT Mon Jun 19 2017 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin, and southeast Wisconsin. .DAY ONE...This Afternoon and Tonight There is a marginal risk for severe thunderstorms across most of south central and southeast Wisconsin. Scattered thunderstorms are expected this afternoon into early this evening. Some of the stronger storms could produce large hail to around 1 inch. Those storms would also produce strong gusty winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There are chances of thunderstorms at times from Tuesday through Sunday. There is a Marginal Risk for severe storms Wednesday evening and night across the western 2/3 of the forecast area. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed for Wednesday evening and overnight. LMZ643>646-201645- Sheboygan to Port Washington WI- Port Washington to North Point Light WI- North Point Light to Wind Point WI- Wind Point WI to Winthrop Harbor IL- 1132 AM CDT Mon Jun 19 2017 This Hazardous Weather Outlook is for portions of Lake Michigan. .DAY ONE...This Afternoon and Tonight There is a marginal risk for severe thunderstorms. Scattered thunderstorms are expected this afternoon into early this evening. Some of the stronger storms could produce large hail to around 1 inch. Those storms would also produce strong gusty winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday There are chances of thunderstorms at times from Tuesday through Sunday. Davis www.weather.gov/mkx
Special Weather Statement
National Weather Service Milwaukee/Sullivan WI
1205 PM CDT MON JUN 19 2017
WIZ046-047-056-057-062-063-191800-
Columbia-Iowa-Marquette-Green Lake-Sauk-Dane-
1205 PM CDT MON JUN 19 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT GREEN LAKE...
NORTHEASTERN IOWA...COLUMBIA...DANE...CENTRAL SAUK AND MARQUETTE
COUNTIES...
At 1204 PM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles north of Montello to near Baraboo
to 6 miles northwest of Spring Green. Movement was east at 25 mph.
Winds in excess of 30 mph and pea size hail are possible with these
storms.
Locations impacted include...
Madison, Sun Prairie, Fitchburg, Middleton, Stoughton, Waunakee,
Baraboo, Verona, Portage, Oregon, McFarland, Monona, Mount Horeb,
Windsor, Edgerton, Columbus, Prairie Du Sac, Marshall, Sauk City and
Lake Wisconsin.
LAT...LON 4398 8889 4363 8889 4363 8901 4285 8901
4286 8984 4317 9019 4330 9019 4350 8980
4365 8967 4364 8960 4372 8960 4398 8937
TIME...MOT...LOC 1704Z 287DEG 22KT 4389 8933 4348 8969 4324 9016
BSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1230 PM CDT MON JUN 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1222 PM HAIL 1 E POYNETTE 43.39N 89.40W
06/19/2017 E0.25 INCH COLUMBIA WI PUBLIC
ACCOMPANIED BY GUSTY WINDS WITH A FEW
BRANCHES DOWNED. NOTHING SIGNIFICANT TO
REPORT.
&&
BSHSpecial Weather Statement
National Weather Service Milwaukee/Sullivan WI
1239 PM CDT MON JUN 19 2017
WIZ051-058-064-069-070-191845-
Dodge-Walworth-Rock-Fond Du Lac-Jefferson-
1239 PM CDT MON JUN 19 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT FOND DU LAC...WESTERN
WALWORTH...ROCK...JEFFERSON AND DODGE COUNTIES...
At 1238 PM CDT, radar indicated strong thunderstorms were located
along a line extending from Green Lake to 7 miles northeast of
Deforest to Stoughton. Movement was east at 30 mph.
Winds in excess of 40 mph and pea size hail are possible with these
storms.
Locations impacted include...
Janesville, Fond Du Lac, Beloit, Watertown, Beaver Dam, Whitewater,
Hartford, Fort Atkinson, Waupun, Elkhorn, Delavan, Jefferson, Ripon,
Lake Mills, Milton, Edgerton, Mayville, North Fond Du Lac, Evansville
and Columbus.
LAT...LON 4250 8936 4285 8937 4285 8901 4363 8901
4363 8889 4390 8888 4389 8841 4394 8840
4394 8817 4354 8816 4354 8840 4320 8842
4320 8854 4250 8853
TIME...MOT...LOC 1738Z 272DEG 26KT 4382 8898 4331 8925 4293 8920
BSHThe Milwaukee radar (KMKX), 58 km away, was scanning. The volume nearest the first event began at 17:59 UTC.
2 thunderstorm wind, 2 hail. Local standard time, as filed.
A tree blown down onto Old WI 73.
A tree down on a power line.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2017Every state in 2017This day in weather historyWarnings in Wisconsin, June 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 707881, 707884, 707879, 707880.