textproduct: Gaylord

KEY MESSAGES

- Rain chances move into northern Michigan later today, peaking this evening through Wednesday morning.

- Increasing winds this afternoon, peaking Wednesday afternoon.

- Mainly dry weather expected during the second half of this week, potentially extending into next week.

DISCUSSION

Issued at 235 AM EDT Tue Sep 8 2026

Pattern / Forecast Synopsis:

500mb ridge axis that has been overhead the last few days in the process of being forced south and eastward by a broad, deepening Pacific borne wave and associated surface low pressure in the process of occluding / closing off over Montana and the Dakotas, along with the southern Canadian Prairies. Surface high pressure overhead also beginning its dispatching stage right as this system continues its north and east progression into central Canada, eventually tracking into the James Bay region by Thursday. The system's associated surface cold front will gradually be forced through the region... albeit slowly... as flow turns more zonal and parallel to the boundary. Result will be a 24-36 hour period of deep moisture advection into the upper Great Lakes that should support atmospheric profile saturation, and perhaps have just enough lift in the region to force a convective element into the picture too.

In the wake of the system, ridging and surface high pressure to temporarily restore meteorological order amid a cooler and drier airmass Thursday and into Friday. Ridging will be amplified by another Pacific wave bull-rushing into the Pacific NW / British Columbia Thursday and Friday... with guidance depicting this wave as closing off and progressing eastward through the northern Canadian Prairies into Hudson Bay by the conclusion of the weekend, and forcing its associated cold frontal boundary through the region, perhaps returning briefly unsettled weather to the region ahead of a cooler and drier stretch next week.

Details:

Rain / Thunder Chances through Wednesday: Advancement of deeper moisture will initially struggle across the region today, with the more prolific convective response being confined to the western Yoop through the St. Croix River Valley in WI / MN through late afternoon owing to better elevated instability... which also aligns with where today's Marginal Risk for severe has been laid down by SPC. Instability will be lacking across APX-Land this afternoon owing to thicker cloud cover hampering lapse rates aloft along with low-level dry air suppressing low level buoyancy within the profile. Nonetheless, as this deeper moisture plume makes its advance, there will be a window for some high-based light rain showers. Wouldn't be overwhelmingly surprised to see most areas hold dry for the majority of the day, especially the farther south one goes... but, the status quo changes in the evening through overnight. Core of the deepest moisture finally makes its way through the region, accompanied by a pre-frontal warm nose that coincides with nocturnal stability in the low levels.

As such, weak elevated instability (to the tune of 200-400 measly J/kg) within a zone of strong isentropic lift to manifest some convective showers across the region tonight. As pointed out by previous forecaster, thunder chances may be hampered by limited buoyancy higher in the profile within this instability plume. Convective allowing guidance continues to struggle getting buoyancy much past -10C likely places thunder coverage on the isolated side. That being said, with such a juiced atmosphere, some of these convective showers may be capable of some efficient downpours, especially as we go later into the overnight and activity peaks. Overall, most areas on average probably see 0.10-0.25" of rain this evening through late Wednesday morning... but there can easily be some embedded 1.00"+ rainfalls... the coverage of which probably holds much more isolated the farther north one goes.

Trending Windy by Wednesday: Increasingly pinched pressure gradient to make its way through the region with this system... initially hampered by the presence of a warm nose Tuesday evening / night... probably keeps a cap on gusts at 25mph. As the front makes its passage through the day Wednesday, increasingly cooler and drier air within the dry slow of the system to noticeably increase as momentum transfer is maximized. With 925mb flow 25-35kts, certainly possible to see some 40mph wind gusts late Wednesday morning through the afternoon... especially near the lakeshores and the highest interior terrain. Not enough there just yet for land based wind headlines... but will need to watch areas near Whitefish Bay as some guidance wants to have 925mb flow pushing 40kts up there owing to that long Lake Superior fetch. For now, wind headlines will be confined to marine zones.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 614 AM EDT Tue Sep 8 2026

Cigs will gradually lower today into tonight as top-down saturation continues (although VFR cigs will likely be maintained through much of the period). A few showers may fall out of this mid level overcast this afternoon, with much better rain chances arriving overnight. May also see a few embedded thunderstorms as well. Some support early Wednesday morning for the development of MVFR producing cigs...especially at KCIU and KPLN. Initial light winds become a bit gusty today into tonight out of the south and southwest.

APX WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...Small Craft Advisory from 5 AM Wednesday to 5 PM EDT Thursday for LHZ345>348. Small Craft Advisory from 5 AM to 11 PM EDT Wednesday for LHZ349. Small Craft Advisory from 2 PM this afternoon to 11 PM EDT Wednesday for LMZ323-341-342-344>346. Small Craft Advisory from 2 PM this afternoon to 8 AM EDT Thursday for LSZ321. Small Craft Advisory from 8 AM to 11 PM EDT Wednesday for LSZ322.