A lone thunderstorm developed along the Mississippi River during the early evening of August 3rd. A funnel cloud formed with the storm and was sighted by several people at a local business west of Centerville (Trempealeau County).
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The episode as NWS ARX wrote it up.
A lone thunderstorm developed along the Mississippi River during the early evening of August 3rd. A funnel cloud formed with the storm and was sighted by several people at a local business west of Centerville (Trempealeau 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 Aug 3, 5:33 PM CST, 1 hour 7 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 633 PM CDT Sat Aug 3 2019 .SHORT TERM...(This evening through Sunday night) Issued at 220 PM CDT Sat Aug 3 2019 As of early afternoon, temperatures have climbed into the 80s over much of the area with visible satellite showing a cu field developing across the area. Scattered storms have begun to form across NE MN into N WI. With an uncapped environment and MLCAPE rising into the 1000-2000 J/kg range, expect continued development of scattered showers/storms through the afternoon before diminishing by early evening. Most of the these will remain east of the MS River across central or north central WI. With very weak wind fields, storms will be disorganized and severe storms not expected. Some fog should develop late tonight, particularly in river valleys or others that receive rainfall this evening. Weak surface high pressure will persist over the area on Sunday ahead of a cold front approaching from the northern plains. Another warm and humid day is expected /925 mb temps around 22-23C/ with highs in the 80s. Given weak capping, an upper shortwave could help trigger isolated pulse type showers/storms in the afternoon with weak shear and 1500-2000 J/kg SBCAPE. These would diminish by early evening with loss of daytime heating. A few showers/storms could approach from the northwest early Monday morning as the cold front begins to sink south into the area. .LONG TERM...(Monday through Saturday) Issued at 220 PM CDT Sat Aug 3 2019 Monday... Main focus is on chance for storms. Cold front will be moving southeast through the area on Monday, which should provide the focus for storms. Temperatures in the 80s and dewpoints in the 60s should be sufficient to develop some instability over our area, with CAPE values in the 1500-3000 J/Kg range. With southwesterly flow out ahead of the front and northwest flow aloft, there will be some wind shear present with 0-6km values around 30 kts, which would be sufficient for storm organization and a few strong/severe storms. Main questions are whether forcing will be strong enough to trigger more widespread storms, and timing of the frontal passage. Convergence does not look especially strong along the front across our area, and upper level support is also not very strong as the main shortwave trough remains farther northeast in Ontario. Still a few questions, but something to keep an eye on. Tuesday through Saturday... Not much change in the Tuesday-Saturday timeframe, with northwest flow pattern continuing and periodic shower/storm chances as weak waves move through the flow. Things look to be a little cooler than this weekend as 925mb/850mb temperatures fall by Tuesday, with highs in the 70s and lower 80s and lows in the 50s and 60s for the remainder of the week. && .AVIATION...(For the 00Z TAFS through 00Z Sunday evening) Issued at 633 PM CDT Sat Aug 3 2019 Much like the past few days, high pressure remains in control across the area. Only difference today is a very weak frontal boundary drifting southwest out of central Wisconsin, which continues to produce scattered showers and storms well east/north of both LSE and RST (save for one tiny shower just northeast of RST as of 2330Z). Will have to watch that boundary closely as it's not completely out of the question for a shower or storm to get close to LSE through 04Z, though the risk is relatively low. Will also be watching fog potential overnight, with the "typical" river areas likely to fog in, but also some spots that picked up rainfall today. Whether or not it will fog at LSE remains in question, with light westerly flow just above the surface not historically conducive for river fog to spill over the airport itself, though with higher dew points today, can't rule out an hour or two of MVFR or even IFR ceilings/visibility. Otherwise, quiet weather set to continue into much of Sunday, with just isolated afternoon showers and storms again expected. Risk at LSE or RST just too low to even mention at this point. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...JM LONG TERM...Lee AVIATION...Lawrence
Hazardous Weather Outlook National Weather Service La Crosse WI 545 AM CDT Sat Aug 3 2019 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-041100- 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- 545 AM CDT Sat Aug 3 2019 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight Scattered thunderstorms are expected mainly east of the Mississippi River this afternoon into this evening. The main hazard will be lightning. .DAYS TWO THROUGH SEVEN...Sunday through Friday There will be thunderstorm chances Sunday afternoon through Monday night. There will be a slight chance for a few strong to severe storms Monday afternoon into Monday evening. On and off chances for thunderstorms will be seen Tuesday through Friday but severe weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. DAS
The La Crosse radar (KARX), 36 km away, was scanning. The volume nearest the first event began at 00:37 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud was sighted west of Centerville from a storm that had formed along the Mississippi River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2019Every state in 2019This day in weather historyWarnings in Wisconsin, August 2019
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: 847749.