


Area Forecast Discussion
Issued by NWS Gaylord, MI
Issued by NWS Gaylord, MI
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496 FXUS63 KAPX 160704 AFDAPX Area Forecast Discussion National Weather Service Gaylord MI 304 AM EDT Wed Jul 16 2025 .KEY MESSAGES... -Hot and humid today with scattered showers and thunderstorms, particularly across northern lower Michigan. Potential for torrential rainfall and gusty winds with these storms. -Another round of showers and thunderstorms passes through the area, particularly in areas along and south of M-72. Potential for torrential rainfall, gusty winds, and a non-zero tornado risk. -Drying out and turning quite cooler Thursday. Highs likely range from 65 to 75 degrees. && .SHORT TERM /THROUGH THURSDAY/... Issued at 304 AM EDT Wed Jul 16 2025 Current Overview / Pattern Synopsis: Departing area of surface high pressure will ease its influence across northern Michigan as the next 24 to 30 hours trend more active. Stationary frontal boundary currently stretching from Val -d`Or, Quebec to North Platte, Nebraska. Zonal flow regime aligns well with the front, with a series of waves riding the boundary... all convectively charged... one over northeast Ontario, another associated with repeated rounds of storms across the Wisconsin Highlands and western upper Michigan, and another developing across South Dakota and Nebraska. Strong area of surface high pressure in Canada will move south and east with time, forcing the frontal boundary south and east toward northern Michigan. Subtle diffuse moisture boundary / wind shift draped across eastern Wisconsin, turning southeast toward Muncie, Indiana and Columbus, Ohio. This boundary will be drawn northward as large scale ascent increases, leading to a surge in moisture content across the region. Minimal forcing will lead to a disorganized convective mode in the afternoon, consisting of pulse dominant convection in a moist (1.5+ PWATs) profile. Then, as the front works closer, an upstream wave originating from the aforementioned South Dakota / Nebraska convective complex works closer, bringing potential for a linear convective mode to scrape parts of northern Michigan, aided by LLJ acceleration (25 to 40 kts), moisture intrusion (PWATs swell as high as 2.0 after 00z), and just enough lingering surface instability to keep the potential for storm maintenance from coast to coast across portions of lower Michigan, possibly impacting the southern few rows of counties of the APX CWA. Forecast Details: There will be two distinct convective episodes across the region. As far as outlooks go for today... northern Michigan (especially northern lower) is squarely within a Marginal Risk for Excessive Rainfall (via WPC) today, with a Slight Risk poking into the southern CWA. Much of northern lower is in a Marginal Risk for Severe Storms (via SPC), with a Slight Risk poking into Manistee County. Scattered showers and storms later this morning into the afternoon: Starting off largely dry, with the best chances for a shower by daybreak favoring eastern upper along the immediate surface frontal boundary. Rapid destabilization anticipated as deeper moisture surges into the region, leading to widespread surface dewpoints in the upper 60s to near 70 across northern lower. Surface temps quickly rise well into the 70s and into the 80s, with the most aggressive CAMs initiating convection across the SW CWA as early as 14z. Expecting scattered showers and storms to continue blossoming across the region through the afternoon with a pulse dominant mode. With the aforementioned surge in PWATs coupled with weak upper flow and bulk shear of 15 to 20kts through the afternoon, anticipating slow-moving, torrential rain producing storms to be the rule this afternoon, especially along/south of a Beulah to Rogers City line. Primary hazards with this activity will be localized rainfalls in excess of 2.50" in a short time, which may lead to marginal flooding concerns... along with some gustier winds from any updraft collapses into the afternoon. Radar presentation will likely be littered with thunderstorm outflow boundaries by the afternoon as storms pulse up and down. Potential for a line of storms tonight: Latest CAMs continue to lay down the potential for a convectively charged wave to progress eastward from NE/SD through Iowa and into Wisconsin by this afternoon. Strength of this wave remains in question due to convective contamination in guidance, but nonetheless, it sure looks like shower and storm development should materialize across central into eastern Wisconsin through the afternoon, congealing into a linear segment (and potentially) a larger bow echo that looks to cross Lake Michigan early this evening, moving into lower Michigan with time as we move into the overnight. Waning instability should, from a conceptual standpoint, lead to a lessening intensity of this feature as it progresses eastward through lower Michigan. That being said, reinforcing LLJ acceleration to as high as 40kts on the most aggressive of CAMs suggest that convective maintenance is possible at the nose of this increasing LLJ field due to the presence of some elevated instability. General theme is that this convective complex should pass somewhere along and south of M-72, with only increasing potential the farther south one goes. It is possible that the greatest risk for this complex of storms to pass holds just south of the area, but where this feature occurs will likely only show its cards until later in the afternoon. As far as hazards with this particular feature goes, torrential rainfall, possibly aided by some echo training due to slow advancement of this feature, is on the table with PWATs as high as 2.0, and a classic warm rain profile. In the event this overlaps some spots that get downpours this afternoon, another flooding risk may arise as this setup can yield impressive rain totals of 2.00"+ with ease. In addition, anticipating that there will be potential for some damaging winds with this feature, especially if a bookend vortex on the north end of the line can get into the CWA. Furthermore, with low LCLs in the moist atmosphere and shear ballooning to 40 to 45kts, suppose there is an embedded tornado threat as well if enough surface instability can be realized. In the event this particular feature holds south of the CWA, this will dramatically decrease potential for severe weather across the region. So after all that... what else is in store across the region? North of this possible complex of storms, efficient stratiform rains are on the table, with potential for an additional 0.50"+ of rain, generally south of M-32. From M-32 to the Bridge, it is entirely possible that you land in "meteorological purgatory", an atmospheric state characterized by perhaps some lighter passing showers and plenty of dry time. This particular region will see the lowest overall chances for rain tonight. North of the bridge, mid level frontogenesis may lead to a band of stratiform rain that looks to bisect eastern upper from SW to NE. Most spots in the eastern Yoop probably see 0.25" or less outside of this main fronto-driven band, but areas that land under this more efficient rain band could see over 1.00" by daybreak Thursday. Later tonight: Once the wave and associated frontal boundary clears the area to the south and east later tonight, expecting shower and thunder chances to decrease from NW to SE into Thursday morning, with just some lingering showers gradually becoming confined to northeast lower with time through Thursday morning, with dry and sunnier conditions largely prevailing into the afternoon. Will have to watch Canadian wildfire smoke trends in the wake of this passage, but latest guidance is pessimistic toward higher concentrations of smoke over the region, so thus perhaps the occasional haze is possible through the day. A sharply cooler airmass will be in place Thursday... and boy howdy is it sharp. Average highs this time of year are generally in the upper 70s to lower 80s. Anticipating daytime highs across the region to peak anywhere from 65 to 75... warmest in Gladwin, Arenac and Iosco counties. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Issued at 304 AM EDT Wed Jul 16 2025 Strong area of Canadian high pressure set to build through the weekend, bringing with it quite the drop in humidity with slightly below normal daytime highs into the weekend. As such, this will likely allow those looking to give their air conditioners a break to do so. With Thursday`s afternoon highs being so low, anticipating quite the chill across the area Thursday night as winds decouple and temperatures plummet into the 40s and 50s. Dry Friday with highs in the low to upper 70s, overnight lows in the upper 40s into the 50s. Another wave passes through this weekend, returning rain chances for Saturday. High pressure returns into Sunday, with seasonable temperatures in the 70s and 80s. Looking ahead to next week, return flow looks to build in, which should draw in warmer and a little bit more moist air to the region. Thus, expecting highs to peak back into the low to upper 80s at times, with occasional shower and storm chances not off the table, especially heading toward midweek. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 245 AM EDT Wed Jul 16 2025 Upstream convection is fading enough to maintain quiet conditions in the forecast through tonight, with decreasing winds and VFR for most. A few pockets of MVFR CIGs and VSBYs try to develop during the morning, otherwise VFR. Shower and storm chances increase Wednesday, especially in the afternoon, (although some -SHRA possible in the morning) and thus, have VCSH for most locations. Best chance for -TSRA Wed afternoon will be APN. Winds NW to W, with lake breeze circulation shifting winds to east at APN. Any TSRA could have brief gusty winds and torrential rain through Wednesday night. && .APX WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ SHORT TERM...HAD LONG TERM...HAD AVIATION...JLD