Area Forecast Discussion
Issued by NWS Gaylord, MI
Issued by NWS Gaylord, MI
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519 FXUS63 KAPX 201847 AFDAPX Area Forecast Discussion National Weather Service Gaylord MI 247 PM EDT Thu Jun 20 2024 .KEY MESSAGES... - Isolated to scattered showers and storms through Friday. - Widespread showers through Saturday night. - Locally heavy rainfall possible Friday night into the first half of Saturday night. - Showery and mostly cool conditions expected next week. && .SHORT TERM /THROUGH FRIDAY/... Issued at 243 PM EDT Thu Jun 20 2024 Pattern Synopsis and Forecast: Sfc high pressure will remain to the north-northeast of the region tonight into Friday. However, moisture remains trapped across the region with scattered showers and storms possible. Additionally, ridge across the southeast shifts slightly to the south on Friday, with a mid level perturbation pushing into the middle portions of the country later on Friday. Response is for lowering of heights across N MI into Friday. Low pressure associated with this disturbance will be the feature of focus this weekend. Primary Forecast Concerns: Moderate moisture (I suppose it`s a quite a bit more than moderate w/P Dubs & Dews ~>= daily 90th percentile) will continue through tonight, and even increase on Friday especially across southern portions of northern lower Michigan. Thus, we`ll keep the chance for showers & storms in the fcst from tonight into Friday. Could be another band of showers later tonight in the vicinity of the Tip of the Mitt as progged by latest 12Z guidance. CAMs are hinting at this potential meanwhile the ECMWF shows another healthy batch of rain possible (which it did yesterday as well if I recall). Additionally, looks like a pretty good chance for showers and thunderstorms Friday afternoon roughly south of M-32 where the better moisture pools, but lapse rates and thus instability is generally overall a little underwhelming in regards to severe weather. That being said, any more robust thunderstorms will definitely have the chance to produce heavy rains (for reference, almost an inch and a half of rain fell in Alpena in a relatively short period of time due to the anomalously moist environment earlier this morning) and perhaps some gusty winds. Despite this, winds do increase with height and although CAMs are not too impressed (with severe), might be worth keeping an eye. Temperatures generally in the 70s and 80s once again with generally light winds again Friday. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Issued at 243 PM EDT Thu Jun 20 2024 No major changes to the long term forecast. The upper level ridge is still shown to eventually retrograde westward which will set up shop to our southwest. Before that occurs, tropical moisture moves northward into the Great Lakes this weekend. At the same time, northern stream short waves top the ridge and move across the area. This is all expected to result in widespread showers and embedded thunderstorms Friday night into the first half of Saturday night. Localized heavy rainfall is expected with models indicating some spots could see 1 to 2 inch amounts with even higher amounts possible. The heaviest rainfall Friday night is expected to be concentrated across eastern upper and far northern lower with the heavier rainfall slowly shifting to the south into the remainder of northern lower on Saturday. Ponding of water on area roadways is likely. The northern jet stream is then expected to be the dominant feature up here Sunday into much of next week (but with small deviations in the flow as short waves disrupt the flow). There will be periodic chances for showers and possibly embedded thunder next week. Temperatures are expected to be near to perhaps even slightly below normal for the most part (with the exception of Monday when the warmer air tries to briefly surge northward). && .AVIATION /18Z TAFS THROUGH 18Z FRIDAY/... Issued at 135 PM EDT Thu Jun 20 2024 MVFR-IFR CIGs slowly lift this afternoon with a few areas of SCT SHRA and ISO -TSRA also possible. More MVFR to IFR CIGs reintroduced later tonight and into Friday with another batch of -SHRA -TSRA possible, especially after 06Z. Although there could be BR/FG in isolated areas tonight, not confident enough to put in TAFs. Winds remain light out of the north to northeast generally. && .APX WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ SHORT TERM...JLD LONG TERM...AJS AVIATION...JLD