Area Forecast Discussion
Issued by NWS Milwaukee/Sullivan, WI
Issued by NWS Milwaukee/Sullivan, WI
634 FXUS63 KMKX 271943 AFDMKX Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 243 PM CDT Fri Jun 27 2025 .KEY MESSAGES... - Heat index vales in the 95 to 100 degree range on Sunday. - Thunderstorms are expected Sunday afternoon and evening, along and ahead of a cold front. Gusty winds are possible with the strongest storms. - Turning somewhat cooler and less humid through mid week, with a more active pattern returning toward the end of the week. && .SHORT TERM... Issued 242 PM CDT Fri Jun 27 2025 Tonight and Tomorrow: Stratocu should dissipate fairly quickly this evening as the sun begins to set, as high pressure and associated drier air build into the region. Lows are expected to fall into the upper 50s to low 60s. With clearing skies and the approach of the high, fog is a concern given the recent rainfall. Dense fog potential is greatest west of I-39, though a few low lying areas farther east could see some ground fog by sunrise on Saturday. High pressure will push east of the area tomorrow, with temperatures warming as southerly flow redevelops over the region. Highs will range from the low 80s east to mid to upper 80s over the western and southwestern forecast area. Dewpoints will also begin to climb again by afternoon. Boxell && .LONG TERM... Issued 242 PM CDT Fri Jun 27 2025 Tomorrow Night through Friday: Thunderstorms will develop across northern Wisconsin tomorrow night along a frontal boundary and/or remnant outflow from convection that is expected tonight over the Dakotas. This activity should mainly remain to our north, but may approach central Wisconsin Sunday morning before dissipating. The daytime hours on Sunday are expected to be very hot and humid, with highs around 90. Dewpoints in the low 70s will support heat indices around 100, though right now it looks like most locations will remain just below Advisory levels. Thunderstorm chances increase late Sunday afternoon and Sunday evening. Initial development may be ahead of the cold front, perhaps in association with outflow from the Saturday night convection combined with an approaching MCV from the northwest. Shear will be relatively weak, but an unstable airmass will support strong/severe wind gusts with the strongest storms. An initial weak front will pass through Monday, followed by a stronger cold front Monday night or early Tuesday. High pressure will bring more typical highs (low to mid 80s) to the region through mid week, along with somewhat more comfortable humidity levels. A building ridge to our west then suggests a return to a warmer and more active pattern toward the end of the week. Boxell && .AVIATION... Issued 242 PM CDT Fri Jun 27 2025 A mix of MVFR and VFR stratocu will dissipate this evening. Fog is expected in some spots by morning, with greater chances further to the west. Any fog that develops will dissipate within a few hours of sunrise, with VFR conditions expected during the day on Saturday. Winds will become light and variable tonight, then become light from the south by Saturday afternoon. Boxell && .MARINE... Issued 242 PM CDT Fri Jun 27 2025 Low pressure around 29.7 inches over Lake Huron will push into Quebec tonight. Winds will turn west late this afternoon and this evening as a front moves across the lake. Weak high pressure around 30.1 inches will move into the region later tonight into Saturday, which will allow winds to weaken. Winds will become south and increase Saturday night into Sunday, as the high moves east of the region. Winds then shift west by early next week. Boxell && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && $$ Visit us at weather.gov/milwaukee Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSMilwaukee www.twitter.com/NWSMilwaukee www.youtube.com/NWSMilwaukee