A warm front and shortwave trough brought lines and clusters of severe thunderstorms to southern WI for the afternoon and evening hours. Large hail and straight-line winds were prevalent with tree damage and some structural damage occurring.
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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 warm front and shortwave trough brought lines and clusters of severe thunderstorms to southern WI for the afternoon and evening hours. Large hail and straight-line winds were prevalent with tree damage and some structural damage occurring.
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 14, 11:54 AM CST, 46 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Milwaukee/Sullivan WI 1254 PM CDT Wed Jun 14 2017 .UPDATE... Most focused area of storms will be along the advancing wave this afternoon, with scattered storms possible ahead of the wave. Looking more like an earlier arrival and exit to the main round of storms than previously thought. Severe potential looks about the same as mentioned in the earlier discussion. && .AVIATION(18Z TAFS)... Main concern in the short term is thunderstorms this afternoon. The main round of storms will move through west to east across the forecast area from roughly 18-23Z, with scattered storms likely ahead of this main line. Severe storms with hail/wind the main threats are possible. After storms move through by late afternoon/early evening, may see a few lingering showers and storms through late evening along a weak boundary. Looks mainly dry overnight per several models. Dry weather is likely Thursday into the afternoon, with a shower/storm possible mainly northwest of Madison by late afternoon. VFR conditions will prevail through Thursday except for lower ceilings and visibilities within storms. && .PREV DISCUSSION... (Issued 1012 AM CDT Wed Jun 14 2017) UPDATE... A wave producing thunderstorm activity upstream over Iowa seems like the probable trigger for the next round of thunderstorms over the forecast area. The HRRR is tracking the current situation fairly well and suggests scattered storms to develop in southern Wisconsin by early afternoon, becoming more widespread by mid to late afternoon. Could see the activity wind down then from west to east late afternoon into early evening, though isolated to scattered storms not out of the question through at least late evening. Plenty of filtered sunshine across the area this morning, so still expecting a good amount of instability. Shear still doesn't look overly impressive, but could be enough for a few severe storms given the instability. The latest SPC outlook maintains a Slight Risk for severe storms across the forecast area. Left forecast high temps alone for this afternoon given the amount of sunshine across the area. MARINE... Will keep an eye on the fog potential today, especially as winds become more southeasterly over the nearshore waters. Conditions look good for now though. Otherwise, the main marine concern over the next couple days will be thunderstorm chances, as winds and waves are expected to remain below Small Craft Advisory levels. PREV DISCUSSION... (Issued 607 AM CDT Wed Jun 14 2017) AVIATION(12Z TAFS)...Upstream short wave will bring scattered to numerous showers and thunderstorms to the area from mid-morning through mid-afternoon. Cigs may drop to near MVFR levels if thunderstorms linger over an area. Another round of storms will be possible during the late afternoon and evening. PREV DISCUSSION... (Issued 240 AM CDT Wed Jun 14 2017) DISCUSSION... TODAY AND TONIGHT - Confidence...Medium. Lots of synoptic scale and mesoscale analysis needed for this forecast. Low level moisture return in southeast WI is triggering isolated showers early this morning. This trend will continue at least through the early morning over the east, so wl need to include small pops for this triggering mechanism. Also, weakening outflow boundary from earlier widespread convection may trigger a few storms over western CWA this morning as well. Plenty of MUCin as well as weak bulk shear so not expecting more than an isolated half inch to one inch hail report early this morning. Potential for two rounds of strong to severe thunderstorms this afternoon and evening. Cloud cover will increase but expect enough thin spots in the clouds to cause unstable atmosphere as high temperatures should climb into the mid 80s to around 90 most areas, even closer to the lake. First round likely to be associated with passing mid-level short wave embedded in northward moving long wave trof in the northern Plains and southern Canada. Short term guidance in agreement on carrying this through WI this afternoon. Enough destabilization would be in place for this first synoptic lift event. Bulk shear will increase but will not get out of hand, generally between 25 and 40 knots. However surface based CAPE will increase to 2-3000 joules. A number of mesoscale models vis SPC Ensemble of Opportunity show Updraft Helicity increasing to over 25 m2/s2 with Updraft speeds increasing to over 10 m/s this afternoon. A higher updraft helicity increases the potential for rotating updraft development. Second round of storms would be possible this evening as second mid- level short wave tied to southern Canada low pressure moves through Wisconsin. Question of whether atmosphere will be able to destabilize enough after first round of convection. Thursday - Confidence...Medium Models show a couple different vort lobes swinging through, one close to midday and another later in the day. In the low levels, drier air will be working on a westerly wind flow after the surface/850 fronts movie east early. Hung onto a small POP in the east to account for some very early SHRA potential. While dew points drop below this feature the thermal pattern remains on the warm side with 925 temps in the mid 20s celsius so expect more temps in the 80s. Thursday night through Saturday evening - Confidence...Medium Looking rather active this period. 500 millibar flow will be westerly with a few ripples in the flow before primary/pronounced shortwave arrives later Saturday into Saturday evening. At this time the GFS is the most aggressive with the return moist regime on Thursday night with the ECMWF and GEM showing much less QPF. There may be some concern initially with Bufkit soundings showing low moisture within the column however there may be enough elevated instability combined with a modest 850 southwest wind max and some upper jet dynamics to compensate, so have followed Superblend POPS for now. A few more disturbances with some instability and additional favorable jet placement support Friday and Friday night suggest more TSRA with some higher CWASP values. So some concern for stronger systems this period. Then attention will turn to the more dynamical punch for Saturday as the potent 500 millibar wave approaches. Cyclogenesis will be more pronounced with the GFS and ECMWF both spinning up a 990/991 millibar surface low respectively, in either northern WI or central WI so a couple more rounds of TSRA appear likely, one with the warm front Saturday and then Saturday evening with the trailing cold front and better upper dynamics coming into play. CWASP values this whole period are on the higher side so would expect some stronger and possibly severe storms Sunday - Confidence...Medium Surface low will be off to our northeast leaving WI in a cooler low level thermal trough. Expecting SHRA/ISOLD TSRA within this regime with cyclonic mid level flow lingering. Monday - Confidence...Medium Mid level trough axis shifts east into at least lower MI or or further east per the ECMWF. Still some lingering cyclonic flow on the western side however. Some precip9 Today/Tonight and Aviation/Marine...99 Thursday THROUGH Tuesday...99 potential still in place. Tuesday - Confidence...Medium A 500 millibar wave combined with a renewed WAA surge will result in another chance of TSRA. AVIATION(06Z TAFS)...Skies will become partly to mostly cloudy during the early morning hours as isolated to sct showers and tstorms develop especially over ern WI. Also cannot rule out patchy fog across srn WI for the early morning hours. Another round of showers and tstorms will occur Wed aft-eve with strong to severe convection expected. The prevailing conditions will be VFR with greatly reduced vsbys and cigs within storms. Areas of stratus and fog may then form late Wed night due to moist conditions. MARINE...East to southeast winds will veer more southerly today as surface occlusion moves into the western Great Lakes. Wind gusts are expected to remain below Small Craft levels today. However higher dewpoints will return to the area later today. Lake surface temperatures remain in the mid to upper 50s, and surface dewpoints will likely climb into the 60s. Hence more patchy fog is likely to develop over the near shore waters today. The fog may become dense for a time. Also several rounds of thunderstorms are likely this afternoon and evening. The atmosphere will support several strong to severe storms producing a risk of large hail and damaging winds. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && Update...DDV Today/Tonight and Aviation/Marine...MBK Thursday THROUGH Tuesday...Collar
Hazardous Weather Outlook National Weather Service Milwaukee/Sullivan WI 114 PM CDT Wed Jun 14 2017 WIZ046-047-051-052-056>060-062>072-151815- Marquette-Green Lake-Fond Du Lac-Sheboygan-Sauk-Columbia-Dodge- Washington-Ozaukee-Iowa-Dane-Jefferson-Waukesha-Milwaukee- Lafayette-Green-Rock-Walworth-Racine-Kenosha- 114 PM CDT Wed Jun 14 2017 This Hazardous Weather Outlook is for portions of east central Wisconsin, south central Wisconsin, and southeast Wisconsin. .DAY ONE...This Afternoon and Tonight Scattered thunderstorms are expected across all of southern Wisconsin this afternoon through early evening. Some thunderstorms will be severe and produce damaging winds and large hail. A severe thunderstorm watch is in effect. Heat indices in the low to mid 90s are expected today. There is a moderate swim risk for beaches from Racine northward to Sheboygan. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a chance of thunderstorms mainly from Thursday night into Saturday night. Strong to severe storms are possible at times from Friday into Saturday evening. There is a chance of thunderstorms at times from Sunday through Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is needed through early evening. Spotter activation may be needed Friday and Saturday. LMZ643>646-151815- 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- 114 PM CDT Wed Jun 14 2017 This Hazardous Weather Outlook is for portions of Lake Michigan. .DAY ONE...This Afternoon and Tonight There is a slight risk for severe thunderstorms this afternoon and evening. Large hail and damaging winds are the main hazards. Dense fog is possible at times. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There are chances for thunderstorms at times Thursday night through Saturday night. Strong to severe storms are possible. There will be more chances of thunderstorms at times from Sunday through Tuesday. MRC www.weather.gov/mkx
The La Crosse radar (KARX), 96 km away, was scanning. The volume nearest the first event began at 18:40 UTC.
24 thunderstorm wind, 3 hail. Local standard time, as filed.
Numerous branches and trees down across the northern portion of the county. 65 knot wind gust measured at the AWOS in Reedsburg at 12:55 PM CST.
Trees and power lines down.
Numerous trees down from south to north through the county, including the Portage area.
Three 8 inch diameter trees down.
Many large trees down. Roofs were torn off small sheds.
Numerous reports of trees down in the western portion of the county.
Numerous trees down scattered across the county.
Multiple branches and trees down in Lawrence.
A few trees uprooted.
Dozens of trees down between Verona and Belleville, including the Paoli area.
Trees and power lines down in Neshkoro.
A few trees down in Princeton.
A short swath of trees down. One large tree landed on a house causing significant siding and roof damage to a portion of the home.
Trees down on the southeast shore of Lake Emily.
A large tree down and a sign bent on Highway 26.
A tree down on power lines.
Several trees down.
A roof torn off a milking parlor.
Scattered tree damage reported throughout the county but most concentrated in the Township of Mitchell.
A tree down on power lines.
Several power poles knocked down.
Several trees down.
Tractor trailer overturned by straight-line winds.
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: 707784, 707777, 707783, 707786, 707785, 707787, 707794, 707802, 707796, 707797, 707792, 707778, 707803, 707808, 707814, 707818, 707823, 707825, 707826, 707827, 707830, 707836, 707832, 707838, 707840, 707841, 707779.