textproduct: Gaylord

KEY MESSAGES

- Widespread rain with embedded showers and storms this morning through early afternoon. Main threats are heavy rain and thunder. Medium to high chances for swaths of an additional 0.5 to 1" of rain, low confidence in exact location of swaths

- Marginal chances for an isolated stronger thunderstorm producing damaging wind gusts tonight over northern lower MI

- Isolated shower and storm chances during the day Tuesday south of M-55, with rain chances returning Wednesday

DISCUSSION

Issued at 235 AM EDT Mon Aug 31 2026

Currently, a narrow band of light rain is exiting the sunrise side and slowly continuing eastward over Lk Huron. Scattered showers over central Lk MI and the L.P. are blossoming, but remain very weak. A LLJ over IA/WI is pointed towards northern WI this morning, and will continue to produce scattered showers and a couple storms through sunrise with some of these drifting into NW lower. Near the surface, observations show the warm frontal boundary stalled near M-55 as east winds over northern lower reinforce 60F temps off of northern Lk Hurons cooler surface.

Zooming out, an upper closed low continues to trek across the international border by ND. As this whole system continues eastward this morning, it will re-orient the LLJ with the resulting direction pointed towards northern MI after sunrise. Although the LLJ will be trending weaker as it reaches farther north, it will aid in precip generation. Very deep moisture will continue to reside over the state today, with PWATs approaching 2 inches.

Confidence is higher for widespread rain/showers today as a better surge of the warm sector, in the right direction, will provide the isentropic upglide needed for precip generation. The larger system getting closer helps direct the jet in the right direction, whereas yesterday it was more west/east orientated and laying across the southern portion of the state. Model soundings depict marginal elevated instabilty, which would result in embedded showers with some thunder. The environment is just too saturated for severe threats this morning, however heavier rain could be seen under these storms. A deep WCL will be present, yielding the potential for very efficient rain processes. Steering flow continues to be from west to east. Nailing down where the resulting swaths of greater rainfall will be is the challenge. The warm front will lift today, reaching at least M-32 by this afternoon. This is driven by the LLJ moving over northern MI later this morning, surging the warm sector northward. Due to the movement of these features, rainfall should be spread over much of northern lower today instead of focused over smaller/narrower areas. An additional quarter to half inch of rain over much of northern lower is expected to fall today, with swaths of 0.5 to 1" under the storms producing heavy rain.

As the warm front surges northward, temperatures will warm to above normal today under south winds. South winds will become breezy near the Lk MI coast south of Sleeping Bear Dunes late this morning.

Late this evening, the upper closed low will continue east, dragging a dry slot over northern MN and Lk Superior. Ahead of this, an increase in elevated instability aligns over northern WI and Lk MI. Isolated stronger storms will be possible in this environment. Tonight, this elevated instability will migrate over northern lower. Most of the favorable environmental conditions for stronger storms will reside in the mid levels.. shear is marginal with better 0-6km present, and mid level lapse rates are 7 C/km vs 5 C/km in the lower levels. Convection initiated upstream should be able to continue east into northern MI as the more favorable environment moves with it. Damaging winds, heavy rain, and lightning are the main hazards expected with stronger storms.

Tuesday, the dry slot reaches a good portion of northern MI. Shower and storm chances continue down state, and could reach up near Gladwin county.

Wednesday, a refocusing of the upper jet over the central rockies will induce another lee cyclone over the plains. The subtropical jet continues to pump moisture into the desert southwest and over the central Rockies. More over spreading of moisture is likely mid week for the Great Lakes region, quickly returning clouds and rain chances. Temperatures remain warmer than normal.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1136 PM EDT Sun Aug 30 2026

Still looking at widespread MVFR to IFR producing cigs and light mist/fog to impact KCIU, KPLN, and KAPN into this morning. Cigs should continue to remain VFR at the other locations. Light showers early this morning, with some potential for more robust showers with embedded storms developing near sunrise, with these showers spreading gradually east across the area this morning. Any stronger storms will be capable of producing brief heavy rain and some gusty winds. Shower coverage should decrease later in the morning and especially this afternoon. Light winds this morning, with winds becoming a bit gusty out of the southwest at KTVC and KMBL later this morning into the afternoon. Light winds will continue elsewhere.

HYDROLOGY

Issued at 235 AM EDT Mon Aug 31 2026

We remain in similar antecedent conditions as previous discussions have noted, around 50% soil moisture over NE lower with pocket of FFGs that could result in more run off under persistent moderate to heavy rains. The moving target is the rainfall forecasts. Weak and inconsistent forcing has resulted in widespread 0.2" to 0.6" of rainfall over the last 48 hours over northern lower MI with isolated pockets of 0.5" to 1" and a swath of 1" that tracked over parts of Roscommon, Gladwin, Ogemaw, and Arenac counties.

As precipitation forms over central Lk MI and tracks east this morning, swaths of rainfall 0.5 to 1" should cover parts of NW lower from M-55 up to M-32. Precipitation could become lighter as it tracks east, resulting in less over NE lower. This QPF foot print is a more likely outcome at this time, however low chances still exist for heavier rainfall over the more sensitive parts of NE lower this morning. None of the HEFS probabilities show chances for any river gauges reaching action stage. If heavier rain does align with the areas of lower FFG, flooding in low lying areas and quick rises in streams and creeks is expected. Training of heavier precipitation isn't out of the question either, and would lead to similar flooding impacts.

APX WATCHES/WARNINGS/ADVISORIES

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