Area Forecast Discussion
Issued by NWS Milwaukee/Sullivan, WI

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000 FXUS63 KMKX 120806 AFDMKX Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 306 AM CDT Wed Aug 12 2020 .SHORT TERM...
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(Issued 305 AM CDT Wed Aug 12 2020) Today through Thursday: Sfc high pressure will hold on today and through Thursday leading to light winds and mostly clear skies, although a few high clouds may stream in tonight from some dying thunderstorms over Iowa and Minnesota. Highs will be in the 80s both days and a lake breeze is expected to form today around midday. CMILLER
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&& .LONG TERM...
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(Issued 305 AM CDT Wed Aug 12 2020) Thursday night and Friday: Dry and quiet conditions are expected to continue to finish up the work week across southern Wisconsin. Nearly stationary high pressure from the Great Lakes into the southern Plains will result in very dry and stable air through the low to mid levels of the atmosphere remaining across southern Wisconsin through Friday. Hence will be able to drop small chances for precipitation. This high pressure area will prevent an upstream cold front from advancing into the area until over the weekend. Temperatures will continue to remain warm for mid- August with daytime readings likely returning to the low to mid 80s. Southeast winds will continue to keep lakeshore areas a bit cooler in the afternoon. Some cirrus/altostratus clouds will be likely as upstream convection moves across IA/MN on Friday. Despite the increase in clouds, a pleasant day is expected to finish up the work week. Friday night through Tuesday: Our protective high pressure ridge will finally lose its grip of the western Great Lakes early in the weekend, and get nudged eastward. An upstream amplifying long wave low pressure trof over Canada will continue to move east Friday and Friday night as mid- level pieces of short wave energy rotate around the parent low pressure system. All Extended Guidance in reasonable agreement on this solution with increasing chances for showers and thunderstorms returning to southern Wisconsin Friday night through Sunday. Moderately increasing south winds ahead of a sharpening short wave trof over the Upper Midwest will result in weak moisture transport back into the area Friday night and Saturday, although the stronger return flow will be the west and northwest. An associated cold front or pair of cold fronts are looking likely to move through Wisconsin over the weekend. At this point, the most favored time for scattered non-severe showers and thunderstorms across southern WI is Saturday afternoon and evening. However wl keep small chance going on Sunday due to reinforcing push of cool air. Slightly cooler and drier conditions should settle in for the first days of the new work week. No significant rainfall is expected this weekend. MBK
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&& .AVIATION...
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(Issued 305 AM CDT Wed Aug 12 2020) For the 12Z TAFs: Some patchy fog will be possible in the Wisconsin River Valley area this morning. This fog will dissipate as the morning goes on. Then, high pressure will lead to clear skies and light winds during the day today. A lake breeze will cause a wind shift for lakeshore terminals during the late morning and early afternoon. VFR cigs and vis are generally expected for the TAF period. CMILLER
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&& .MARINE...
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(Issued 305 AM CDT Wed Aug 12 2020) High pressure will lead to light NE winds over all of Lake Michigan through today. Light winds will continue into Thursday becoming more easterly with time. Beyond, high pressure will weaken, but modest easterly to southeasterly winds will linger into the weekend. CMILLER
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&& .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && $$

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