textproduct: Gaylord

KEY MESSAGES

- Periods of rain/storms through at least mid-week next week. Heavy rain possible at times.

DISCUSSION

Issued at 242 PM EDT Sat Aug 8 2026

PATTERN SYNOPSIS/FORECAST:

Flow across the northern tier of the CONUS turning more zonal upstream...with broad ridge still centered over the Desert SW...and various niblets of energy from the Gulf of Alaska trying to connect up with the upper low centered over Hudson Bay, but with lobes stretching back into central Canada (one such lobe associated with a surface trough stretching from Hudson Bay into central Manitoba as of 17z). Bermuda high still in place off the Atlantic coast, and we remain generally perturbed here in the Upper Great Lakes with troughing aloft. Deeper moisture sweeping out of the region attm behind a couple weakening cold fronts stretching from IL/IN toward James Bay...with skies slowly clearing out and dewpoints slowly dropping back into the more comfortable upper 50s/near 60F range. This cold front wraps back to the northwest into MT/Saskatchewan as a warm/stationary front...with low-level flow through the Plains largely orthogonal to this boundary, which also loosely serves as an outline of a mid-level EML plume. Between lee-side troughing and diurnal heating over the Plains amid this setup, some convective activity has developed along the boundary over Nebraska as of 17z.

Cold front will continue to slide out of the area...but expect baroclinic zone to buckle back northward Sunday into Monday...most likely stalling out somewhere in the OH Valley or perhaps as far north as southern MI, likely through at least midweek, which should keep a threat for showers and thunderstorms somewhere across the region...most likely to our south, but worth keeping an eye on as perturbations move through Canada and enhance confluence and subtle upper jet maxima across the region. There are some signals for this boundary to shift southward later next week, depending on how troughing evolves across eastern Canada late in the period...with quite a bit of uncertainty in how things end up going into next weekend.

FORECAST DETAILS...

Rain/storm chances through the period: --Tonight/Sunday...lobe of energy across central Canada attm to swing southeastward tonight as return flow increases across the central Plains...resulting in increased confluence over the Upper Great Lakes. While LLJ and deeper moisture should remain well to our southwest over the Mid MS Valley tonight...not impossible we could get some hints of at least mid-high clouds across parts of the area with the northern stream niblet. Think that whatever boundary gets dragged in from the north Sunday morning could become a focus for redevelopment in the afternoon and into the overnight hours as that deeper moisture approaches from the southwest. Left entrance region jet dynamics should enhance lifting, with pwats ramping up into the 1.5-2in range...suggesting we could squeeze a lot of moisture out of the air. Plume of weak mid-level stability oozing in further signals potential for significant rainfall as it could give us a lot more bang for our QPF buck...and we may well be in an area of increased threat for training storms going into Sunday night (though not impossible these could remain just to our south). Not impossible the training storms/MCS idea hang on into Monday with the subtle ridge axis just to our west and thickness gradient generally WNW-ESE over the region...not impossible this may be what some guidance is picking up on as a subtle PV max that slips in from the northwest Sunday night, and if this occurs...will need to keep an eye out for the focus of heavier rain to shift around from current expectations.

--Early Next Week... the hits look to keep on coming with signals for additional MCS development over the Upper Midwest Monday night as well, with another subtle boost to the jet max aloft to enhance synoptic lift over this moist, zonal boundary in the region. Most likely scenario attm is that the primary boundary and thus, focus for convection, will be further south Monday night than Sunday night...but can't entirely rule out some concerns for our area, pending where upstream convection develops.

--Midweek... by midweek, will be watching for a lobe of Canadian energy to sweep into/by the region (unclear exactly how this unfolds attm), which suggests potential for a boost in the upper jet max and thus, broad dynamic support along that still-lingering zonal boundary in the OH Valley/Great Lakes region. This could be one last shot at activity for us, though it remains entirely possible that the bulk of the focus for convection will be well south of us by this time, and we could remain quiet aside from some diurnal showers (could come close to seeing some lake effect rain showers by late next week if the coldest solutions verify (850mb temps around 5C) and lake surface temps remain stable).

Overall... current signals point toward the heaviest rain remaining to our south/southwest, where there are signals for in excess of an inch of rain every 24 hrs or so early next week...which could certainly lead to saturated soils, increased runoff, and localized flooding. The M-55 corridor is attm approximately the northern extent of the probabilities for heavy rain right on into Wednesday, which is where some of our more hydro-sensitive locations are located.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 648 PM EDT Sat Aug 8 2026

Largely VFR through the period. Winds taper tonight, turning southerly to southwesterly by Sunday morning. Shower potential builds back into the region, first at CIU later tonight into the morning, and then largely favoring MBL and TVC Sunday afternoon. Most of this activity is anticipated to be light and higher based, so unless a downpour can manifest over a TAF site, at this juncture it looks like we hold VFR through the forecast period. Winds may gust over 15kts again Sunday afternoon, particularly for the Lake Michigan TAF sites.

APX WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.