Area Forecast Discussion
Issued by NWS Gaylord, MI
Issued by NWS Gaylord, MI
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488 FXUS63 KAPX 152329 AFDAPX Area Forecast Discussion National Weather Service Gaylord MI 729 PM EDT Mon Jul 15 2024 .KEY MESSAGES... - Front passage late this evening will bring chances for showers and thunderstorms into tonight - Isolated/scattered showers and storms Tuesday night and Wednesday with cooler weather through the end of the week. && .SHORT TERM /THROUGH TUESDAY/... Issued at 317 PM EDT Mon Jul 15 2024 Pattern Synopsis and Forecast: The center of the upper level ridge that has been dominating the western US for some time now is shifting slightly southward. An upper closed low over over Manitoba CA is starting to dip south towards the northern Plains. Generally west winds aloft over the Great Lakes region will persist, however a cold front will make its way over the state later this evening and into tonight ahead of the larger system. The airmass ahead of the boundary will be warm and moist, leading to high instability over our neighbors to the east. Current satellite and radar depict convection starting to fire along the boundary in MN. It will likely mature into an MCS as it moves southeast. Northern MI will likely be too far north for the MCS to track through, however the surface low will be to our north meaning a cold front will still move through late this evening. Isolated to scattered showers and thunderstorms will likely form along the boundary as it moves through (8PM on the western shores and gone by 6 AM for most areas). Most storms will be capable of producing heavy rain, small hail, and gusty winds up to 45 mph. A few storms could be capable of producing severe wind gusts within their outflows and/or down drafts. Isolated storm chances linger over northern lower through early Tuesday morning. Skies should clear by Tuesday midday, with little chances for rain or storms. Temperatuers will be cooler Tuesday with drier air settling in. Breezy northwest winds Tuesday afternoon. Primary Forecast Concerns/Key Messages: Decent uncertainty still exists for how late evening will look, however guidance seems to be keying in on a solution. CAMs generally show scattered storms along the boundary as it moves through starting around 8 PM tonight. Instability (even MUCAPE) will diminish later this evening as the front moves through, which is the possible wrench. This drop in instability is believable due to drier mid level air moving over (proof seen in surface few points mixing down to the mid 60s for some sites this afternoon). Around 30 to 40kts of 0-6km shear exists and will help keep storms organized and sustained as they move across the penisula. All of this points to a likely scenario of isolated to scattered storms along the boundary as it moves through after 8 PM tonight. Most storms will produce heavy rain, wind gusts up to 45 mph, and small hail. A storm or two will have the chance to strengthen and could produce severe wind gusts. Model soundings show around 15kts of LL shear, and paired with higher LCL heights(~4-5 kft) due to slightly drier air, very little to no chance for tornados exist with tonights storms. Wind gusts of even 40 mph can take down trees when paired with heavy rains. Make sure to keep up with the latest forecasts and warnings. && .LONG TERM /TUESDAY NIGHT THROUGH MONDAY/... Issued at 317 PM EDT Mon Jul 15 2024 Pattern Synopsis: Amplified troughing sagged across much of south-central Canada and the north-central CONUS will continue to pivot over the Great Lakes through the middle of the week. Said troughing looks to depart east of the region Thursday into Friday as ridging temporarily folds overhead. Subsidence aloft provided at the ridge/trough inflection point is expected to build surface high pressure across the Great Lakes for the second half of the work week into the beginning of the upcoming weekend. Forecast Details: Showers/storms Tuesday night into Wednesday, cooler ahead -- As height falls overspread the Great Lakes Tuesday night, rain chances will gradually increase into Wednesday. Forcing aloft combined with relatively steep lapse rates/meager buoyancy will support isolated to scattered showers and thunderstorms through Wednesday. More specific details regarding timing/location of best rain chances will become more clear as Wednesday draws near. Precip chances will wane Wednesday night into Thursday as aforementioned high pressure builds into the region, keeping shower/storm chances low through the remainder of the period. Meanwhile, northwest low-level flow will advect cooler, drier air into the region through the middle of the week. This looks to drop high temperatures into the upper 60s and 70s through Thursday, which would be around 10-15 degrees cooler than average for the middle of July. Chilly overnight lows are also anticipated, likely dipping well into the 40s across interior areas Thursday night with calm winds and clear skies allowing for efficient radiational cooling. Temperatures look to warm back up close to average (upper 70s/low 80s highs, mid 50s/low 60s lows) heading into this weekend. && .AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/... Issued at 725 PM EDT Mon Jul 15 2024 Will continue to watch for the possibility of showers and storms to impact the taf sites later this evening into the overnight. Trends support any activity remaining scattered at best, and very possible any showers will not impact taf locations. If they do, brief gusty winds and heavy rain will be a possibility. Still looking at a period of MVFR to even IFR cigs in post cold front environment early Wednesday morning. Conditions should steadily improve through the day Wednesday. Light winds tonight may become a touch gusty out of the northwest on Wednesday. && .APX WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ SHORT TERM...ELD LONG TERM...DJC AVIATION...MSB