During the late afternoon hours on June 12th, a line of fast moving thunderstorms moved out of northeast Iowa into Grant County, producing areas of wind damage across much of the county.
Every event with a place to put it. Tap one for its entry below.
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.
During the late afternoon hours on June 12th, a line of fast moving thunderstorms moved out of northeast Iowa into Grant County, producing areas of wind damage across much of the 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 12, 2:16 PM CST, 38 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 316 PM CDT Wed Jun 12 2024 .KEY MESSAGES... - Shower and storm risk continues through the afternoon, with a secondary round of storms expected to move across the area tonight. Some storms tonight may be severe with the primary threat strong winds and secondary threat hail. - Additional chances for showers and storms spot the forecast tomorrow and then again over the weekend into early next week. - Above normal temperatures for early next week with highs currently forecast into the mid 80s to potentially low 90s. && .MESOSCALE... Issued at 310 PM CDT Wed Jun 12 2024 An MCS took shape across south-central Minnesota around midday and has progressed along the MN/IA border and as of 3pm was located along a line from Fayette to Winona county. Outflow from earlier convection has been undercutting this complex from north to south over the course of the last few hours, limiting the wind threat to the southern apex of the complex along a line from Mitchell to Winneshiek counties. The complex as a whole should weaken as it progresses east of the Mississippi River, but with DCAPE values of 1000-1400 J/kg ahead of the line, cannot rule out wind issues throughout the lifespan of the event as it moves eastward through Grant County. Attention then turns upstream to the cold front that initiates convection over northern and western Minnesota later this afternoon. The CAMSs have failed to adequately handle the strength of the cold pool in our area from the earlier convection both from a temperature and convective morphology standpoint. This does not lend much confidence for how storms will evolve once they reach this modified airmass this evening. Overall, the severe threat with the second line looks to be on par with what is transpiring this afternoon with hail and wind being the main threats. && .DISCUSSION... Issued at 150 PM CDT Wed Jun 12 2024 Thursday and Friday: An upper level shortwave trough is forecast to track north of the area into the Great Lakes area, with an associated 60-90 kt mid- level jet moving eastward across the region. At the surface the cold front will continue to sag down through the area and eventually south of the local area. Hi-res model guidance shows a line of showers and perhaps storms developing and moving down across the forecast area through the day on Thursday. Instability looks to build south of the front locally across our southern counties in the afternoon, but continues to get shunted southward. There still remain some differences in hi-res guidance on the location of storm development with some showing storms on our southern border and others south of our local area. For now, SPC has our southern tier of northeast Iowa and southwest Wisconsin counties in a Marginal Risk (1 out of 5) for severe weather. Otherwise, surface high pressure builds across the region for Friday, with drier conditions and highs forecast in the mid 70s to lower 80s across the area. Weekend & Beyond: Additional Shower and Storm Chances Upper level ridging will continue to build eastward as we head into the weekend. Model guidance shows a couple shortwave troughs lifting northeastward, riding on the backside of the ridge. Moisture will be on the increase with models showing PWATs pushing 1.5+ inches. At the surface a frontal boundary will be lifting up towards the region with an axis of instability (~1000 - 2500+ J/kg) building south of the front. This looks to bring our next chances for showers and storms across the region, with the current forecast increasing chances Saturday afternoon and into Saturday night. There still appear to be some model differences on shower and storm chances Sunday, with some dependency likely on how convection on Saturday plays out. Ensembles suggest quite a bit of instability builds back in Sunday, though current deterministic GFS model forecast soundings do show capping in place for much of the day along with weaker shear values. Overall, will continue to monitor trends in the coming days to determine the severe weather risk. Otherwise, as was previously mentioned moisture conditions suggest that locally heavy rainfall could be a concern for the weekend, especially if storms train over the same areas. Of note, parts of the forecast area are highlighted in the Excessive Rainfall Outlook for this time period. Beyond the weekend, upper level ridging will continue to build across the eastern U.S. resulting in southwesterly flow over the local region. There is still plenty to work out in the details with the potential for various disturbances to move through the flow. The resulting extended forecast keeps broad precipitation chances (~20- 50%) in across the forecast area for the early part of the week. However, with a moist and unstable environment in place across the region, this will be another time to watch for potential strong to severe thunderstorms. Keep up to date as details are refined in the coming days. Early Next Week: Above Normal Temperatures Another point of interest revolves around increased (above normal) high/low temperatures across the region. There are still some differences between the ensemble solutions on just how warm, but current guidance supports temperatures in the mid 80s to potentially lower 90s. As a result, the current forecast would suggest that heat index values could rise into the low 90s for some through the period. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 104 PM CDT Wed Jun 12 2024 The main concern this TAF period will be with showers and thunderstorms currently pushing into the local area. With satellite imagery showing quite a bit of lightning with these storms have opted to include it with the current issuance. Increased wind gusts have also been observed and will be possible with any stronger storms as well. Will continue to monitor conditions in the near term and expect there may be updates through the afternoon and evening. A second round of showers and storms are expected to move across the area ahead of a frontal boundary late this evening/into tonight. Some timing adjustments may be needed with future issuances. && .CLIMATE... Issued at 224 AM CDT Wed Jun 12 2024 A strong upper level ridge will build northward into the region for early next week. Both high and low temperatures will likely climb into the 85th or higher from at least Monday into Tuesday. While high temperatures (mid-80s to around 90) look to be too low for records to be tied or broken, the low temperatures (around 70 to the mid-70s) along and south of Interstate 90 will be warm enough for some potential warm low records to be tied or broken. At this time, the highest chances look be on Tuesday. Looking further out, CPC continues to have a slight (20-40%) risk (20-40%) for excessive heat for areas along and south of Interstate 90 from June 19 through June 25. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && MESOSCALE...Skow DISCUSSION...EMS AVIATION...EMS CLIMATE...Boyne
Hazardous Weather Outlook National Weather Service La Crosse WI 427 AM CDT Wed Jun 12 2024 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-131100- 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- 427 AM CDT Wed Jun 12 2024 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight Scattered storms will be possible from late this morning into tonight. Some could be severe (level 2 out of 5 risk) with damaging winds and large hail the main threats between noon and 8 PM tonight. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Additional scattered storms are expected for the Father's Day weekend. Some of these storms could be strong to potentially severe on Saturday night and Sunday afternoon and evening. The main threats are damaging winds and large hail. Throughout the weekend, these showers and storms will be highly efficient rain producers. This could potentially result in some localized flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed between noon and 8 PM. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Boyne
Special Weather Statement
National Weather Service La Crosse WI
323 PM CDT Wed Jun 12 2024
MNZ079-087-088-095-096-WIZ032>034-041-122100-
Wabasha MN-Olmsted MN-Fillmore MN-Winona MN-Houston MN-Buffalo WI-
Jackson WI-Trempealeau WI-La Crosse WI-
323 PM CDT Wed Jun 12 2024
...GUSTY WINDS WILL IMPACT SOUTHEAST MINNESOTA AND FAR WEST-CENTRAL
WISCONSIN THROUGH 400 PM CDT...
At 320 PM CDT, strong winds were occurring on the backside of a line
of showers moving southeast through the region.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Automated weather observations.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Winona, Arcadia, Wabasha, Whitehall, Alma, Buffalo, Holmen, Goodview,
St. Charles, Plainview, Chatfield, Eyota, Rushford, Lewiston,
Trempealeau, Galesville, Blair, Independence, Elgin, and Buffalo
City.
This includes Interstate 90 in Minnesota between mile markers 214 and
274.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4410 9115 4392 9128 4367 9157 4392 9246
4442 9206 4441 9115
TIME...MOT...LOC 2020Z 273DEG 35KT 4429 9118 4431 9182 4379 9230
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
SkowPreliminary Local Storm Report
National Weather Service La Crosse WI
333 PM CDT Wed Jun 12 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0253 PM Tstm Wnd Dmg 1 N Waucoma 43.08N 92.03W
06/12/2024 Fayette IA Law Enforcement
Trees down in the area. Time estimated from
radar.
&&Preliminary Local Storm Report
National Weather Service La Crosse WI
334 PM CDT Wed Jun 12 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0310 PM Tstm Wnd Gst 2 N Hawkeye 42.96N 91.95W
06/12/2024 M52 MPH Fayette IA Mesonet
Mesonet station HKYI4 Hawkeye.
&&Preliminary Local Storm Report
National Weather Service La Crosse WI
335 PM CDT Wed Jun 12 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0255 PM Tstm Wnd Gst 5 SE Decorah 43.27N 91.72W
06/12/2024 M45 MPH Winneshiek IA AWOS
AWOS station KDEH Decorah Municipal Airport.
&&Preliminary Local Storm Report
National Weather Service La Crosse WI
339 PM CDT Wed Jun 12 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0309 PM Tstm Wnd Dmg 2 N Postville 43.11N 91.57W
06/12/2024 Allamakee IA Emergency Mngr
Trees down in the Yellow River area. Large
amount of dust and dirt kicked up also.
&&Preliminary Local Storm Report
National Weather Service La Crosse WI
352 PM CDT Wed Jun 12 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0315 PM Tstm Wnd Gst Fayette 42.84N 91.80W
06/12/2024 M48 MPH Fayette IA Amateur Radio
A few branches down as well. Time estimated
from radar.
&&The La Crosse radar (KARX), 111 km away, was scanning. The volume nearest the first event began at 20:56 UTC.
4 thunderstorm wind. Local standard time, as filed.
A few trees were reported down around Glen Haven and Bagley. The fire department estimated winds to be around 60 to 70 mph.
Wind gust was measured at Boscobel Airport (KOVS).
Trees were reported down on power lines in Lancaster and Boscobel.
Trained spotter reported tree branches down in Dickeyville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2024Every state in 2024This day in weather historyWarnings in Wisconsin, June 2024
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: 1192146, 1192147, 1192148, 1192149.