Mt. Lacrosse Snow Report

647 FXUS63 KARX 290532 AFDARX Area Forecast Discussion National Weather Service La Crosse WI 1232 AM CDT Wed Jul 29 2026 .KEY MESSAGES... - Potential impacts from wildfire smoke primarily west of the Mississippi River initially this evening and overnight. - Precipitation chances increase through Friday from west to east with local confidence decreasing in higher rainfall amounts (1"+) and strong storms (<5%). && .DISCUSSION... Issued at 1231 AM CDT Wed Jul 29 2026 Potential Near Surface Smoke Impacts Into Thursday: A stout area of anticyclonic flow over the Upper Mississippi River Valley will cause a mostly persistent forecast until Friday when precipitation chances increase from west to east. Main impact concern through midweek will be potential near surface smoke causing poor air quality. Tuesday satellite imagery exhibited the off- surface increased vertically integrated smoke over and upstream of the forecast area with the anticyclonic flow expected to sink particulates to the surface Wednesday evening into the nighttime hours (HRRR 28.18Z). Location of high pressure in relation to the local forecast area will determine extent of local impacts with current confidence for highest impacts primarily west of the Mississippi River Valley. Precipitation Chances Friday Into Saturday: A deepening extratropical cyclone will slide east-southeast through the Northern to Central Plains Thursday night through Friday, bringing precipitation chances across the Upper Midwest as it passes. Current confidence in the low`s progression jogging south as it approaches the Upper Mississippi River Valley abates higher confidence for higher precipitation probabilities and unstable air west and south of the local forecast area. Although, without this southern shunt, locally increased rainfall amounts and instability is possible. While outlying, select EPS members suggests 3"+ QPF in select local areas with a more northern, moist solution. Current long term global ensemble confidence keeps the near normal low level temperatures over the forecast area until early next week when low level theta e advection ramps up. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 1231 AM CDT Wed Jul 29 2026 Valley fog remains the primary aviation concern overnight, primarily for those sites along the Wisconsin River valley. Conditions for valley fog impacts at KLSE have become slightly more favorable so will be something to continue to monitor, but confidence is still not high enough to include mentions in the TAF. Otherwise, VFR conditions prevail across the region through the day with light southerly winds less than 10KT, though near-surface smoke looks to increase this afternoon/evening, mainly west of the Mississippi River, such that visibilities may be slightly reduced. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && $$ DISCUSSION...JAR AVIATION...Falkinham