A thunderstorm near a frontal boundary over southwest WI produced downburst winds and tree damage.
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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.
A thunderstorm near a frontal boundary over southwest WI produced downburst winds and tree damage.
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 15, 6:27 PM CST, 1 hour 56 minutes earlier.
Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 727 PM CDT Thu Jun 15 2017 .UPDATE...Weak low to mid level warm advection and frontogenesis has resulted in a cluster of strong to severe tstorms over ne IA. Expect the strongest storms to move esewd toward higher CAPE; thereby remaining in IA and IL. CAPE is at a minimum over much of se WI and south central WI due to deep mixing today. Isold to sct showers and tstorms will move ewd across far srn WI through the evening with only slight chances north of Madison and Milwaukee. && .AVIATION(00Z TAFS)...VFR conditions tonight and Fri. A period of broken mid to high level cloud cover is expected tnt as isold to sct tstorms move ewd across far srn WI and nrn IL. Just small chances of tstorms mainly Fri aft with cumulus bases around 4-5 kft. && .PREV DISCUSSION... (Issued 305 PM CDT Thu Jun 15 2017) DISCUSSION... Tonight and Friday...Forecast confidence is medium to high: Isolated to scattered storms are expected this evening into early tonight, as a low level jet sets up to the south and deeper moisture begins to return to southern Wisconsin. Looks fairly quiet then later tonight into Friday morning, before a weak wave will probably kick off a few more storms late morning into the afternoon. Seeing enough instability and shear in models to think a couple storms could approach or reach severe limits this evening into tonight. SPC expanded the Marginal Risk through almost all of the forecast area. There is a Marginal Risk for severe storms in the southwest tomorrow. Above normal temps will continue tomorrow, though highs should be a couple degrees cooler due to more clouds and slightly cooler 925 mb temps. Friday night through Saturday night...Forecast confidence is medium. We'll be in a moist and generally unstable weather pattern through the period. Rain and thunderstorm chances are more uncertain Friday night into Saturday morning given the lack of any definitive features. But, by Saturday afternoon a rather strong synoptic system will arrive. A decent surface low spins up over the western Great Lakes on Saturday in response to a strong mid level wave pushing in. An accompanying cold front will see a surge of heat/moisture ahead of it. Deep layer shear increases to 50-60kts with CAPE building to 1500-2000j/kg. The best CAPE/Shear will be south of Wisconsin, across Iowa and Illinois. There is uncertainty as to the eventual track of the low and this will impact the cape/shear profile/location. For now, SPC has most of far southern Wisconsin in a slight risk of severe for Sat afternoon and evening. Wouldn't be surprised to see this expanded north. Sunday thru Tuesday...Forecast confidence is medium. A deep mid level trough will move across the area during this period. Temperatures will finally turn cooler in the wake of the cold front with highs in the 70s through the period. We could see some showers or even a thunderstorm, primarily during the afternoons each day due to diurnal instability with colder air aloft. Wednesday and Thursday...Forecast confidence is medium. As the mid level trough exits, we get back into a summertime flow again. Surface low pressure forms to the west and we get back into a warmer southerly flow. Temps will be climbing back into the 80s with dewpoints on the rise. The low out west looks like it will arrive on Thursday, bringing a decent chance of showers and storms later in the week. AVIATION(21Z TAFS)... VFR conditions will prevail through Friday. The exception to this will be in isolated to scattered storms. The best chance for storms will be this evening into early tonight and late Friday morning into the afternoon. Winds remain right on the fence for a lake breeze moving inland late this afternoon. The lake breeze is currently right along shore per latest radar and obs. Winds will probably be borderline for a lake breeze tomorrow as well, so something to keep an eye on for locations close to Lake Michigan. MARINE... The lake breeze is right along shore this afternoon and should be similarly located on Friday. Otherwise, looks like pretty quiet wind and wave conditions the next couple days. Will be dealing with more thunderstorms at times tonight into the weekend. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Update...Gehring Tonight/Friday and Aviation/Marine...DDV Friday Night through Thursday...Davis
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 817 PM CDT Thu Jun 15 2017 WIZ046-047-051-052-056>060-062>072-170130- Marquette-Green Lake-Fond Du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 817 PM CDT Thu Jun 15 2017 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin, and southeast Wisconsin. .DAY ONE...Tonight Isolated showers and thunderstorms are expected tonight south of Madison and Milwaukee. .DAYS TWO THROUGH SEVEN...Friday through Thursday There is a chance of thunderstorms Friday through Saturday evening. Strong storms are possible Friday into Friday night with the greater likelihood of severe storms Saturday afternoon into Saturday evening as a cold front moves through. There is a small chance of thunderstorms at times from Sunday through Tuesday. No severe weather is expected. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed Saturday afternoon and evening. LMZ643>646-170130- 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- 817 PM CDT Thu Jun 15 2017 This Hazardous Weather Outlook is for portions of Lake Michigan. .DAY ONE...Tonight Isolated thunderstorms are expected south of Milwaukee. .DAYS TWO THROUGH SEVEN...Friday through Thursday There are chances for thunderstorms at times Friday through Saturday night. Strong to severe storms are possible. There will be more chances of thunderstorms at times from Sunday through Tuesday. www.weather.gov/mkx
The Milwaukee radar (KMKX), 117 km away, was scanning. The volume nearest the first event began at 02:21 UTC.
2 thunderstorm wind. Local standard time, as filed.
Many trees and power lines down in and just south of South Wayne.
Several trees down on West River Road.
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: 707862, 707864.