Area Forecast Discussion
Issued by NWS Gaylord, MI
Issued by NWS Gaylord, MI
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191 FXUS63 KAPX 231926 AFDAPX Area Forecast Discussion National Weather Service Gaylord MI 326 PM EDT Sun Jun 23 2024 .KEY MESSAGES... - Lingering shower chances into tonight. - Dry start to the work week. - Heavy rain/storm threat Monday night into Tuesday... - Unusually chilly lows Wednesday night? && .SHORT TERM /THROUGH MONDAY/... Issued at 324 PM EDT Sun Jun 23 2024 Mid/upper level troughing continues to deepen across the northern Great Lakes early this afternoon, made to do so by embedded shortwaves rotating southeast around retrograding upper level ridge building into the Desert Southwest. Lead wave, responsible for yesterday`s significant rains and isolated severe weather, has exited stage right as another rather robust wave digs southeast across Lake Superior. Combination of lingering low level moisture, diurnal trends, and cyclonic flow within overhead troughing has kicked off a a few showers and areas of drizzle/sprinkles across portions of the Northwoods this morning and afternoon. A bit of a cool one for early summer, with most areas only in the upper 60s to middle 70s. Lake Superior wave will continue to dig southeast, cutting across the northeast half of the area into early this evening. Building mid/upper level heights to follow, with expanding upper level ridge into the western Great Lakes on Monday. Attendant surface high will build directly across our area through the day Monday. Primary Forecast Concerns/Challenges: Addressing lingering shower concerns into this evening. Temperature and cloud trends through Monday. Details: Still expecting a few showers and perhaps a rumble or two of thunder into this evening, especially focused across eastern upper and northeast lower Michigan where forcing from passing wave and limited instability/low level convergence will be maximized. Any precipitation amounts should remain light, and nothing severe expected. Clearing skies overnight leads into a sun-filled and downright pleasant looking Monday...courtesy of that high pressure mentioned above. Moderating airmass and that sunshine will help temperatures to rebound to more normal levels, with afternoon readings ranging from the middle 70s to lower 80s. && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... Issued at 324 PM EDT Sun Jun 23 2024 PATTERN SYNOPSIS/FORECAST: Progressive pattern across North America...with troughing over the western US now, shortwave ridge over the central Canadian Prairies, and trough over the Upper Great Lakes...with a shortwave trough to our northwest spinning down toward Lake Superior, and another to our northeast. Latter feature (also the one that moved over our area yesterday/last night) has attendant anomalous 850mb low, with 996mb surface reflection over central Ontario. Cooler, and somewhat drier, air flooding into the Upper Great Lakes in its wake...with cold front stretching from the aforementioned low down by Detroit and all the way into northern Oklahoma. From here, it begins to take a northward turn up the lee of the Rockies/High Plains as a warm/stationary front associated with western troughing and attendant Alberta clipper over western Canada. Progressive pattern looks to continue through the next week...with current troughing to give way to ridging for Monday...followed quickly by upstream Clipper system Monday night into Tuesday...bringing some warm advection convection to the region...which could wreak havoc with the current temperature forecast. A second shortwave trough slips in behind this Tuesday night into Wednesday morning, persisting the idea of cooler and likely drier air again...for a potentially chilly night Wednesday night. Flow then becomes northwest/westerly aloft for a time...as the next system develops to our west for Friday. Some signals for a potentially anomalous surface low to develop over the central US Friday/Saturday, which could bring some activity (and perhaps warmth) back to our area to wrap up the workweek. Attm...a fair bit of timing/placement differences to detangle...but general idea of a system moving through during the Friday/Saturday timeframe certainly looks appealing attm, particularly noting some potential for better dynamics with this feature...though too far out to determine details attm. Primary Forecast Concerns: Heavy rain/storm threat Monday night into Tuesday...Setup Monday night appears quite favorable for one of those warm advection MCSs that has a tendency to lead to heavy rain. Potential for a decent cap to swing over the Upper Midwest/Upper MS Valley Monday afternoon, which, with increasing return flow, suggests advection of moist and weakly stable air into the vicinity of a NW-SE oriented warm front. Question is, will this setup end up far enough northeast to impact our area...or will the bulk of the activity end up scraping us and settling into SW Lower MI? Quite a bit of uncertainty attm in where this will focus the heavier rains...but some signals (and just a general pattern recognition through pessimistic eyes) for this to remain to our southwest, potentially scraping parts of NW Lower. Even so, still close enough to our area that it can`t be overlooked...particularly noting that some parts of our area have seen as much as 3-5 inches of rain in the last 7 days (the bulk of which has fallen in the last 48-72hrs). Additionally...think there is potential for enough deep-layer shear to have some concerns for storm organization, which bears watching for severe storm concerns, in addition to the heavy rain threat. Unclear attm how long this threat will linger into Tuesday, particularly with respect to redevelopment...given that the 700mb cap may slide into our region during the afternoon, such that what instability aloft should develop may be difficult to achieve. If by some chance we were to achieve it...then things could get much more active Tuesday afternoon with potential for elevated storms/hail, though this remains rather uncertain attm. Wednesday appears quite cool behind this system...with highs over parts of the area only reaching into the mid 60s as high pressure settles in from the northwest going into Wednesday night. Assuming a typical diurnal temperature swing (20-25 degrees)...would expect lows Wednesday night, particularly over the interior higher terrain, to drop into the lower 40s. Not impossible some localized spots could get colder than this...though the amount of low-level moisture that will likely still be present from the recent rainfall (particularly pending rain Monday night into Tuesday) could prevent lows from bottoming out as far as they otherwise could. Will keep an eye on this going forward. && .AVIATION /18Z TAFS THROUGH 18Z MONDAY/... Issued at 1257 PM EDT Sun Jun 23 2024 Looking at periods of MVFR cigs into this evening, especially at KAPN and KCIU...where a few light showers may also occur. Gradual clearing trend expected tonight, with mostly sunny skies Monday morning. Will need to watch for some patchy fog tonight, particularly at KMBL. Gusty northwest winds go light and variable tonight. && .APX WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory until 11 PM EDT this evening for LHZ347>349. && $$ SHORT TERM...MSB LONG TERM...FEF AVIATION...MSB