Numerous showers and thunderstorms moved across southwest Wisconsin during the morning of June 26th. Funnel clouds were sighted with this activity with one briefly touching the ground between Dickeyville and Cuba City (Grant 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.
Numerous showers and thunderstorms moved across southwest Wisconsin during the morning of June 26th. Funnel clouds were sighted with this activity with one briefly touching the ground between Dickeyville and Cuba City (Grant County). The tornado was only on the ground for about a minute and no damage was reported.
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 26, 4:45 AM CST, 4 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 545 AM CDT Tue Jun 26 2018 .SHORT TERM...(Today and tonight) Issued at 345 AM CDT Tue Jun 26 2018 At 3 AM, a well developed low pressure system was located over western Iowa. Scattered showers and storms were found across southeast Minnesota, northeast Iowa, and southwest Wisconsin. Temperatures were in the 60s. The 26.00z models are in good agreement that this low will move east across the Upper Mississippi River Valley through tonight. As this occurs, bands of showers and storms will move across the region. It continues to look like the best instability will remain south and southeast of the area. For much of the area, the deep shear will be unfavorable for severe weather. However, in northeast Iowa and southwest Wisconsin, the shear will be high enough near the triple point for maybe a few strong to severe storms to develop. The 0-1 km shear even becomes favorable for the development of a few tornadoes across southern Wisconsin, northern Illinois and far eastern Iowa this afternoon. At this time, it looks like the best chances for these will be south and southeast of Grant County. .LONG TERM...(Wednesday through Monday) Issued at 345 AM CDT Tue Jun 26 2018 On Thursday afternoon and night, a strong upper level ridge will build across the region. ML CAPES will be climb into the 2 to 3K range. However, with 700 mb temperatures climbing into the 10 to 15C, much of this instability may not result in the development of showers and storms. At this time, only the NAM and Canadian are the only ones that are generating showers and storms. If this convection does happen to develop, the deep shear shear is weak. However, with 0-3 km shear up to 30 knots there is a potential for damaging winds. In addition to this, heavy rain and hail will also be a possibility. From Thursday night into Friday night continues to look be very warm to hot. 850 mb temperatures anomalies will be in the 2 to 3 standard deviations above normal across the Upper Mississippi River Valley. This will result in high temperatures climbing into the lower and mid 90s. These temperatures be warm enough for a few highs could be tied or broken. More on these can be found in the climate section below. There will be not much relief from the heat at night. Low temperatures will be in the lower and mid 70s on Thursday night and mid to upper 70s on Friday night. In addition to the heat, dew points will climb into the mid to upper 70s. The combination of these temperatures and dewpoints will result in heat indices of 95 to 105F on Friday afternoon and evening. A Heat Advisory will likely have to be issued for this time period. On Saturday and Saturday night, a cold front will move slowly southeast through the Upper Mississippi River Valley. ML CAPES will climb to around 4K J/kg. While the shear ahead of this front is weak, it does become favorable for the potential of a few super cells to develop along the cold front. && .AVIATION...(For the 12Z TAFS through 12Z Wednesday morning) Issued at 545 AM CDT Tue Jun 26 2018 Bands of shra/ts today as a low pressure system transitions eastward, taking a track just south of the TAF sites. Cigs: Mostly mvfr today with an expectation of falling into IFR later tonight. Weak upper level ridging and the departure of the low should lead to improvement later Wed afternoon. WX/vsby: bands of shra/ts associated with spiraling upper level energy and then the sfc/upper level low. Enough instability a loft (albeit skinny in nature - per bufkit soundings) warrants some mention for thunder - more so for KLSE, although can't rule it out for KRST. Meso models exit the bulk of the pcpn chances by 00z, and will trend forecast this way. Reductions in vsby with any heavy shower/storm...and then see some potential to dip into mvfr br later tonight - with low level saturation from the rains/light winds coming into play. Winds: eastward through the day, becoming light north as the low pushes east. && .HYDROLOGY... Issued at 345 AM CDT Tue Jun 26 2018 There will be the potential for areas of heavy rain today, but they should be brief and should not cause any significant rises along area rivers and streams. The flood wave will continue to move south along the Mississippi River. It will cause minor flooding from Wabasha south through McGregor. Minor flooding will come to end at Wabasha, Winona, and La Crosse tonight, Genoa on Thursday morning, and McGregor by Sunday morning. See the latest flood statements for current river forecasts on our web site at www.weather.gov/lacrosse. && .CLIMATE... Issued at 345 AM CDT Tue Jun 26 2018 Below are the record high temperatures for June 29th (Friday)... Northeast Iowa... Charles City 102F in 1931 Crecso 96F in 1970 Decorah 105 in 1910 Elkader 100F in 1913 New Hampton 100F in 1931 Southeast Minnesota... Austin 95 in 1988 Caledonia 96F in 1970 Grand Meadow 99F in 1931 Preston 96F in 1970 Rochester 99F in 1931 Theilman 99F in 1962 Winona 103F in 1931 Western Wisconsin... Alma Dam 4 97F in 1970 La Crosse 101F in 1931 Medford WI 98F in 1910 Mauston 94F in 1966 Mondovi 100F in 1931 Neillsville 104F in 1910 Prairie du Chien 104F in 1931 Sparta 94F in 1991 Trempealeau Dam 98F 1939 && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...Boyne LONG TERM...Boyne AVIATION...Rieck HYDROLOGY...Boyne CLIMATE...Boyne
Hazardous Weather Outlook National Weather Service La Crosse WI 401 AM CDT Tue Jun 26 2018 IAZ011-029-030-WIZ053>055-061-271100- Allamakee-Fayette-Clayton-Vernon-Crawford-Richland-Grant- 401 AM CDT Tue Jun 26 2018 This Hazardous Weather Outlook is for portions of northeast Iowa and southwest Wisconsin. .DAY ONE...Today and Tonight Scattered thunderstorms will be seen through this evening. A few storms may become strong to severe with the main threats being damaging winds, heavy rain, and maybe an isolated tornado. .DAYS TWO THROUGH SEVEN...Wednesday through Monday There are thunderstorm chances on Thursday night and for the weekend. It is too early discern if there would be a severe threat. Heat builds in Friday with heat indices ranging from 95 to 105 during the afternoon and early evening hours. .SPOTTER INFORMATION STATEMENT... A few spotting groups may be needed briefly this afternoon. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ008>010-018-019-MNZ079-086>088-094>096-WIZ017-029-032>034- 041>044-271100- Mitchell-Howard-Winneshiek-Floyd-Chickasaw-Wabasha-Dodge-Olmsted- Winona-Mower-Fillmore-Houston-Taylor-Clark-Buffalo-Trempealeau- Jackson-La Crosse-Monroe-Juneau-Adams- 401 AM CDT Tue Jun 26 2018 This Hazardous Weather Outlook is for portions of northeast Iowa...southeast Minnesota and west central into central Wisconsin. .DAY ONE...Today and Tonight Scattered thunderstorms will be seen through this evening. No severe weather is expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday There are thunderstorm chances on Thursday night and for the weekend. It is too early discern if there would be a severe threat. Heat builds in Friday with heat indices ranging from 95 to 105 during the afternoon and early evening hours. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Boyne
The Quad Cities radar (KDVN), 112 km away, was scanning. The volume nearest the first event began at 15:41 UTC.
1 tornado, 1 funnel cloud. Local standard time, as filed.
A brief tornado touched down north of County Road H and east of Quarry Road between Dickeyville and Cuba City. The Grant County Emergency Manager reported no damage with the tornado.
A funnel cloud was sighted in Platteville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2018Every state in 2018This day in weather historyThe tornado archive for Wisconsin, 2018Warnings in Wisconsin, June 2018
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: 761774, 761776.