Weather Alerts For Onalaska, WI

# HEADLINE -------------------- HEAT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING # DETAILS -------------------- WHAT Heat index values of 95 to 103 degrees. WHERE Portions of north central and northeast Iowa, southeast Minnesota and central, southwest and west central Wisconsin. WHEN From 1 PM this afternoon to 8 PM CDT this evening. IMPACTS Hot temperatures and high humidity may cause heat illnesses to occur. ADDITIONAL DETAILS Confidence is low in the exact high temperatures since there will be storms in the area. The coverage area of this advisory may be further reduced if storms become more widespread. ISSUED AT Wednesday, July 1, 2026 at 12:09 AM CDT ISSUED BY National Weather Service La Crosse WI HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Stay cool, stay hydrated, stay informed. # AREAS AFFECTED -------------------- Clayton, Richland, Adams, Allamakee, Chickasaw, Crawford, Fayette, Floyd, Grant, Houston, Howard, Juneau, La Crosse, Mitchell, Monroe, Vernon, Winneshiek Including the cities of Osage, Cresco, Decorah, Waukon, Charles City, New Hampton, Oelwein, Elkader, Caledonia, La Crosse, Sparta, Tomah, Mauston, Friendship, Viroqua, Prairie Du Chien, Richland Center, and Platteville

There is a Slight Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF WESTERN KANSAS SUMMARY Scattered severe thunderstorms will continue across parts of the central High Plains, with severe wind gusts being the primary hazard. Other severe thunderstorms are still possible across the Great Lakes and Northeast, as well as broader parts of the central Plains to middle Missouri Valley. Central Plains into the Upper MS Valley Between a broad large-scale trough over the West and an expansive upper ridge over the eastern half of the CONUS, a belt of enhanced midlevel southwesterly flow is yielding around 40-50 kt of effective shear from the central Plains into the upper MS Valley. Here, middle/upper 60s to lower 70s dewpoints beneath steep midlevel lapse rates (sampled by 00Z observed soundings) are contributing to moderate-strong surface-based buoyancy. Despite gradual nocturnal boundary-layer cooling, this buoyancy and deep-layer shear will continue to promote the development of loosely organized convective clusters and supercell structures spreading northeastward overnight. The primary concern with this activity will be damaging/severe wind gusts (some upwards of 75 mph) and large hail. Northeast A band of thunderstorms tracking southeastward across southern Ontario could spread into parts of NY tonight, and given an established cold pool, damaging winds will be possible. However, surface observations and the 00Z ALB sounding suggest lingering low-level static stability in the wake of earlier convection may limit the overall severe risk.