5 in an hour across northwestern portions of Grant County. Numerous streets were flooded in Beetown Township as a result.
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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.
During the afternoon and evening hours on July 2nd, rounds of showers and storms moved across portions of Grant County with one round of storms producing around 1.5 in an hour across northwestern portions of Grant County. Numerous streets were flooded in Beetown Township as a result.
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 Jul 2, 2:04 PM CST, 3 hours 27 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 304 PM CDT Tue Jul 2 2024 .KEY MESSAGES... - The atmosphere is priming itself for a second wave of showers and storms, with a heavy rainfall and flash flooding threat across northeast IA and southwest WI. Another 1-3" could fall this afternoon into the evening, and a Flood Watch is in effect. The flooding threat diminishes after 8-9 pm. - July 4th has shower and thunderstorm chances increasing from west to east as the day progresses, with most areas seeing rain at some point during the afternoon and evening. There was a small increase in the severe storm threat across northeast IA for later Thursday. Also, more rain is forecast with 1" north of I-90 a higher probability (35-45%). - Unsettled weather into the weekend with periodic rain chances and below normal temperatures. Probabilities have increased north of I- 90 for 1"+ of rain Friday too. Heavy rain and severe weather chances look minimal at this time after Friday. && .DISCUSSION... Issued at 303 PM CDT Tue Jul 2 2024 Flash Flooding Threat Through Evening GOES visible imagery showing rapid destabilization occurring across southeast Iowa with a warm front now located near I-80 per observations at 18Z and moving north. SPC mesoanalysis at 19Z indicates 1000 J/Kg of MUCAPE has moved into northeast IA and far swrn WI, with the warm front and 1000 J/Kg of SBCAPE forecast to just pass through the southern part of Grant county. There is a big pool of SBCAPE to the south, around 4500 J/Kg. Lightning and storms are on the increase regionwide but the most significant area is the convergent, inverted trough northeast of the Topeka surface low center in central Iowa. Convective initiation there will train into the Flood Watch area and the CAMS have done a nice job leading that conceptual model. The air mass is tropical with 2" precipitable water (PW) values indicated on the GOES PW in the clear, warm sector over southeast IA at 1920Z. Thus, expect the storms to form on the trough as radar indicates they are, and train into the Flood Watch area with mid-level frontogenesis favoring lift northwestward leveraging any elevated instability (albeit only 250-500 J/Kg). Have updated rain amounts to 1-2.5" total in the Flood Watch with 3" right in the heart of a training axis. The most threatening window is 4-8 pm with diminishing threats afterward and all precipitation east of the area by midnight. Should the warm sector enter parts of the far southern Grant county, there may be a window of surface-based storms where a tornado could not be ruled out and a higher wind gust. We will be monitoring this situation and the surface CIN over the coming hours. Wednesday is looking outstanding and one of the better days of the week it seems. July 4th Still Looking Wet There are still some details to work out,the forecast generally is on track for July 4th with weather system moving in from the west during the day and into the night. The model guidance is consistent with its idea of a deepening tropospheric low shifting into the area in northwest flow with good 300-500mb qVector convergence overcoming the area in the later afternoon and evening. By 7 pm Thursday, a mid- level jet max is forecast over Iowa with the area seeing some increased juxtaposition of SBCAPE and deeper wind shear. These probabilities of 750 J/Kg of SBCAPE and 30 kts of 0-6km shear are on the increase with 30-40% suggested over northeast Iowa, decreasing north and east. Instability seem to be the main question with a rich pool further south, and some guidance differences in southerly flow or easterly flow ahead of this low at the surface. Overall, increasing shower and storm chances Thursday. SPC has the area in a marginal risk /level 1/ which seems appropriate. There may also be a heavier rainfall threat of over an inch Thursday night. The 02.00Z Grand Ensemble targets the I-94 corridor right now with 35-45% probabilities beginning on I-90 and increasing north Thursday afternoon and night. This is a tricky little system when many people want to be outdoors, so hopefully additional details can be added to the forecast in the next day. Unsettled into the New Week Friday is a day for the frogs it seems. The deep low lingers overhead with some instability present. It seems like a day where showers and occasional storms pinwheel across the area. This system on Friday will need to be watched a bit for higher rainfall amounts over 1". While the tropical precipitable water values shift east, there is more of a trowal-like air stream wrapping around the north side of the low-level low into WI with values of 1.25-1.50". Right now, the 100 member Grand Ensemble is suggesting a 35% chance of 1"+ north of I-90. The low shifts east with shortwave ridging in place for Saturday in much of the guidance and the highest probability for a dry day with comfortable temperatures. Rain chances then ramp up for Sunday with yet another system coming in. Unsettled overall in this period with below normal temperatures and humidity. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1252 PM CDT Tue Jul 2 2024 Main taf concerns are IFR conditions this afternoon into this evening along with the threat for thunder at both RST/LSE taf sites. Low pressure will move across the area this afternoon/evening and spread another round of showers/storms. Conditions will remain in IFR or lower to IFR this afternoon and continue into this evening. With the lack of instability over the area and coverage of thunder...confidence in thunder occurring at LSE/RST taf sites remains low. Will continue mention of vicinity of thunder at both RST/LSE taf sites. Drier air advects into the area after 06z Wednesday and allow conditions to improve to VFR at both taf sites. && .HYDROLOGY... Issued at 303 PM CDT Tue Jul 2 2024 Flooding continues on the Mississippi river with no large changes noted in the new forecasts except for Guttenberg and McGregor Iowa. The river forecast came up another 1/2 foot or so and it seems the Wisconsin river input water flow plays a part with the forecast consistency. Otherwise, with 1-2" of rain fell across the area last night and this morning. There are rises occurring and forecast on the tributaries, and some to flood stage, but nothing major out of last nights rain. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...Flood Watch until 1 AM CDT Wednesday for WIZ054-055-061. MN...None. IA...Flood Watch until 1 AM CDT Wednesday for IAZ029-030. && DISCUSSION...Baumgardt AVIATION...DTJ HYDROLOGY...JAW
Hazardous Weather Outlook National Weather Service La Crosse WI 101 PM CDT Tue Jul 2 2024 IAZ008>011-018-019-MNZ079-086>088-094>096-WIZ017-029-032>034- 041>044-053-031215- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Wabasha- Dodge-Olmsted-Winona-Mower-Fillmore-Houston-Taylor-Clark-Buffalo- Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- 101 PM CDT Tue Jul 2 2024 This Hazardous Weather Outlook is for portions of northeast Iowa...southeast Minnesota...into western and central Wisconsin. .DAY ONE...Through Tonight Flooding continues along the Mississippi River. Please see the latest flood statements for additional details. Thunderstorms this afternoon into this evening will bring brief heavy rain but additional flooding and flash flooding is of a low probability (0-20%). Severe storms are unlikely. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Flooding will continue along some area rivers. Please see the latest flood statements for additional details. Thunderstorms may occur Independence Day through Monday, mainly during the afternoon and evening hours. At this time, confidence in severe thunderstorms or additional heavy rainfall is low. .SPOTTER INFORMATION STATEMENT... While spotter activation is not anticipated, any reports of rain and flooding would be appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ029-030-WIZ054-055-061-031215- Fayette-Clayton-Crawford-Richland-Grant- 101 PM CDT Tue Jul 2 2024 This Hazardous Weather Outlook is for portions of northeast Iowa and southwest Wisconsin. .DAY ONE...Through Tonight Flooding continues along the Mississippi River. Please see the latest flood statements for additional details. Thunderstorms this afternoon into this evening will bring heavy rain with an additional 1-2", localized 3" amounts. 2-3" amounts would most likely lead to additional flooding and flash flooding. A Flood Watch is in effect this afternoon and evening as a result. A strong storm may occur this afternoon and evening, but the overall probability for a severe storm is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Flooding will continue along some area rivers. Please see the latest flood statements for additional details. Thunderstorms may occur Independence Day through Monday, mainly during the afternoon and evening hours. At this time, confidence in severe thunderstorms or additional heavy rainfall is low. .SPOTTER INFORMATION STATEMENT... While spotter activation is not anticipated, any reports of rain and flooding would be appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Baumgardt
The La Crosse radar (KARX), 116 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
1 flash flood. Local standard time, as filed.
Emergency management reported numerous roads closed in Beetown Township with Portage Bridge Road also underwater.
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, July 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: 1199857.