For the second time in three days, a line of severe thunderstorms moved across portions of western Wisconsin during the afternoon of June 14th. These storms blew down trees and power lines from Viola and La Farge (Vernon County) to northeast of Big Flats (Adams County).
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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 ARX wrote it up.
For the second time in three days, a line of severe thunderstorms moved across portions of western Wisconsin during the afternoon of June 14th. These storms blew down trees and power lines from Viola and La Farge (Vernon County) to northeast of Big Flats (Adams County).
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 La Crosse, WI wrote its last area forecast discussion before the first event at Jun 14, 5:06 AM CST, 4 hours 54 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 606 AM CDT Wed Jun 14 2017 .SHORT TERM...(Today and tonight) Issued at 349 AM CDT Wed Jun 14 2017 Main short-term fcst concerns are SHRA/TSRA chances thru the period and severe TSRA risk mainly this afternoon/evening. 06z data analysis had a 999mb low over central ND with a mid level low over the ND/MT border. Main cold front with the low extended south thru eastern SD. Band of SHRA/TSRA extended from NE MN to NE NEB, lifting steadily NE. Convection with the band across southern MN to central IA weakening as it outruns the forcing/lift and contends with weakening low level moisture transport, decreasing CAPE, increasing CIN and warmer 700-500mb temps closer to the mid level ridge axis. Convection in NE NEB/SW IA showing a bit more life, aided by a shortwave lifting out of central KS. Model runs of 14.00z initialized well, except for GFS once again as much as 10-15F too high with sfc dew points across parts of southern MN to northern MO. Solutions remain quite similar at the larger scale as the eastern MT mid level low lifts to near Lk Winnipeg by 12z Thu. However, smaller/meso scale detail differences continue to impact the sensible weather outcome across the area in the short term. Short term confidence is average average this cycle. For the short term, reasonable model consensus for convection to continue to weaken as it moves into/across the fcst the area early this morning, as it faces weakening moisture transport/CAPE and the warmer mid level temps. A shortwave to be lifting from KS into western IA by 12z. This look to provide some lift for persistence of convection across the SW half of IA to continue spreading NE into the fcst area thru before diminishing by mid morning. After that, signal among many of the high-res/CAMs models that much of the fcst area may well end up dry thru at least the 15-21z hours. After a late morning/early afternoon lull, question then becomes when/where will convection re- fire this afternoon. Model consensus now wants to shift the CAPE axis east of the fcst area this afternoon with the main lower level moisture transport shifted east as well. Hgts do lower thru today as the mid level low lifts to near Lk Winnipeg, with mid level cooling and diurnal warming working to reduce the capping this afternoon. Convection this afternoon may fire over the east end of the fcst area around mid afternoon, ahead of a shortwave approaching/already east of the MS river by 18z, may not fire at all, or near the MS river around 00z. This is the variety of solutions presented. No matter which may be more correct, appears upscaling to a more organized convective complex may not occur until this evening and likely to be SE of the fcst when it does. Still will be 1500-2500 j/kg MUCAPE across the area this afternoon, along with an increase of deep shear as the hgts fall ahead of the low/trough lifting NE into Canada. Severe storms would be possible when TSRA refire, with slight risk per swody1 reasonable at this time. However, risk this afternoon into the evening may be somewhat conditional depending on how much cloud cover may remain over the area today impacting diurnal warming. For now will carry some higher SHRA/ TSRA chances early this morning, lower thru the mid-day hours then more in the 30-50% range later this afternoon/into the evening, highest over the east half of the fcst area. Sfc cold front and sfc-850mb drying is pushed thru the area tonight as the sfc-500mb flow becomes more westerly behind the low lifting into south-central Man. Good model agreement for convection in the area to come to an end/exit east around or shortly after midnight. A more comfortable night later tonight with the drying set to lower sfc dew points into the upper 50s/lower 60s by 12z Thu. Blend of the guidance highs/lows for today/tonight looks good. .LONG TERM...(Thursday through Tuesday) Issued at 349 AM CDT Wed Jun 14 2017 For Thursday thru Friday night: main fcst concerns this period are SHRA/TSRA chances Thu night thru Fri night. Model runs of 14.00z in good agreement on the mid level low lifting into northern Ont thru 12z Sat with a generally westerly flow aloft over the region this period. Detail differences with shortwaves in this flow. Good agreement for one stronger wave with the mid level low to pass The morning, then lesser agreement on a wave to approach/pass around 12z Fri and another Fri night. Fcst confidence this period is average given the wave timing/strength differences impacting SHRA/TSRA chances. Thu should see a quiet, mostly sunny day on deep layered westerly flow from the central/northern plains. However GFS and now NAM are wanting to bring some increase of moisture and lower level forcing NE into the area Thu afternoon, for a SHRA/TSRA chance across mainly the SW half of the fcst area. Model soundings showing diurnal mixing to as deep as 750mb Thu afternoon, with around 500 j/kg SBCAPE and minimal CIN. Cannot rule out isolated-sct SHRA/TSRA Thu afternoon but will leave fcst dry for now. With a better signal for a shortwave trough axis to pass Thu night/Fri, and more time since late Wed night for some moisture to return ahead of it, some small SHRA/TSRA chances mainly across the south 1/2 of the fcst area these periods look OK. Lesser agreement on details, but with another surge of moisture increase ahead of yet another shortwave progged for Fri night. Model soundings Fri night showing that if elevated layers in the 850-700mb range can saturate and be lifted there is as much as 500-1500 j/kg CAPE and minimal CIN. The 30=40% consensus SHRA/TSRA chances Fri night appear reasonable for now. With some stronger deep=layered shear Fri/Fri night and as much as 1000 j/kg MUCAPE or more, a few TSRA Fri afternoon could be strong. See swody3 for more details. With the westerly flow and little cooling at 925-850mb, consensus highs/lows this period remaining as much as 5 to 10F above normal appear well trended. For Saturday thru Tue (days 4-7): main fcst concerns this period are SHRA/TSRA chances Sat and again Mon, cooler temperatures for Sun into Tue. 14.00z medium range models in rather good agreement on a stronger shortwave trough to come thru the flow and across the region later Sat/Sat night, setting up longwave troughing over the great lakes for Sun/Mon. Shortwave detail differences by Tue, impacting progressiveness, or not, of the troughing over the region. Overall day 4-7 fcst confidence is average. Stronger shortwave trough to approach/pass Sat/Sat night bring a stronger round of deep layered forcing/lift across the area. This with PW values progged to be in the 1.5 inch range, as much as 1k-2k j/kg MUCAPE and deep shear of around 40kts. Consensus SHRA/TSRA chances in the 30-60% range Sat afternoon/evening reasonable. A few of these storms may be severe as well. Plenty of time to detail this. Behind this system, good agreement for some stronger cooling to arrive as troughing sets up over the great lakes. Highs returning to near or below normal for Sun-Tue continue to look well trended. With the cold pool aloft spreading in Sun and deep cyclonic flow, some small mainly diurnal SHRA/TSRA chances are reasonable. Lesser confidence with any small consensus precip chances Mon/Tue, as models at are at odds on strength/timing of shortwaves thru the flow and if the longwave troughing is progressive or not. && .AVIATION...(For the 12Z TAFS through 12Z Thursday morning) Issued at 606 AM CDT Wed Jun 14 2017 An area of showers and storms advancing northeast out of Iowa has been slowly diminishing. Still expecting this to impact KRST this morning with some light rain that falls out of a VFR mid level deck. Confidence that this will hold together and get to KLSE is low so will only include a VCSH for the morning. After that, pretty low confidence on how much additional convection will form. A cold front across the Missouri River Valley will advance east into the area this afternoon and then move out of the area this evening. The 14.10Z RAP brings a decent short wave trough through later this morning but after that, there is not much to help kick off any convection. Some of the meso-scale models still try to form some scattered activity late this afternoon along the front and since a VCTS was already in the KLSE forecast, will keep this for continuity. Skies should clear out fairly quickly this evening behind the front for quiet VFR conditions overnight. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...RRS LONG TERM....RRS AVIATION...04
Hazardous Weather Outlook National Weather Service La Crosse WI 526 AM CDT Wed Jun 14 2017 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-151100- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston- Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau- Adams-Vernon-Crawford-Richland-Grant- 526 AM CDT Wed Jun 14 2017 This hazardous weather outlook is for parts of southeast Minnesota...northeast Iowa and western Wisconsin. .DAY ONE...Today and Tonight Scattered thunderstorms will move across the area this morning. The main threat from these storms will be lightning. There is a chance for thunderstorms this afternoon and evening, mainly along and east of the Mississippi River. A few of these could be strong to severe, with the main threats being damaging winds, large hail and locally heavy rain. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday More thunderstorms are possible Thursday night into Sunday. The risk of severe weather is low with any of the storms from Thursday night through Friday night as well as Sunday. Though there is some uncertainty, Saturday afternoon and evening will have to be watched for the potential of strong to severe storms. At this time, the main threats would be damaging winds and large hail. .SPOTTER INFORMATION STATEMENT... Spotter groups may be needed this afternoon and evening, mainly in Wisconsin. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. RRS/04
The La Crosse radar (KARX), 45 km away, was scanning. The volume nearest the first event began at 16:00 UTC.
6 thunderstorm wind, 1 flood. Local standard time, as filed.
Runoff from heavy rains pushed the Trempealeau River out of its banks in Dodge. The river crested less than a half foot above the flood stage at 9.23 feet.
A tree was blown down near Viola.
A tree was blown down west of La Farge.
Trees and power lines were blown down in Elroy.
Trees and power lines were blown down in Mauston.
Trees and power lines were blown down near New Lisbon.
Trees were blown down northeast of Big Flats.
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: 705502, 702974, 702961, 702962, 702963, 702964, 702967.