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KEY MESSAGES

-Ideal fire weather conditions build this Monday.

-Active weather remains in the forecast through next week with periodic rain and frost chances. Low end probabilities for localized mixed precipitation towards the end of the week.

DISCUSSION

Issued at 233 AM EDT Sun May 3 2026

Pattern Synopsis:

Midlevel closed low pressure system remains positioned over Ontario/Quebec today and will continue to pivot around Hudson Bay for the next several days. After a brief warm-up today and Monday from a low-amplitude shortwave ridge, Canadian air mass influence will form a blocking pattern across the Great Lakes region next week. This will result in 850mb temperatures near freezing and seasonably cool temperatures for early May. Periods of precipitation will continue through the rest of the week as embedded height waves from the aforementioned low track through the Great Lakes Region. The majority of active weather remains rainfall, but cool temperatures aloft and the potential timing of precipitation will keep low probabilities of mixed precipitation in the forecast towards the end of the work week.

Forecast Details:

Favorable wildfire conditions this Monday... The previously mentioned shortwave centered over Northern Ontario will create a weak frontal boundary to sweep across the Great Lakes Region Monday night. Model soundings depict a shallow low-level saturated layer with conditionally unstable lapse rates and a small inverted v profile. Enough instability should produce some isolated convection with 30-35kt low level winds mixing to the surface. Even with precipitation ranging from a general trace to a tenth of an inch for most areas, dry atmospheric conditions and gusty winds ahead of the line should continue favorable fire weather conditions Monday afternoon.

Periodic chances of rain and frost chances continue through the midweek...Aforementioned midlevel low pressure will pivot around Hudson Bay with shortwave troughs dipping into the northwoods bringing seasonably cool cP air and sensible weather with it. With 850mb temperatures below freezing, high temperatures beyond Tuesday will remain in the 40s and 50s for most areas with overnight temperatures near or below freezing. Additional frost/freeze warnings will likely need to be reissued as we head closer to midweek next week. Low-level lingering moisture behind Monday night's front will continue light precipitation chances as well, along with low probabilities of some mixed precipitation returning to the forecast. Best timing for this feature remains around the Thursday/Friday timeframe as another wave digs through the Great Lakes region.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

Issued at 1141 PM EDT Sat May 2 2026

VFR tonight through much of tomorrow... save for PLN with MVFR and CIU firmly into MVFR, possibly borderline IFR, into the afternoon before trending back to VFR across the board. SHRA possible, primarily CIU, PLN, and perhaps APN too. SW winds hold calm through daybreak but quickly increasing through the morning into the afternoon... gusts of 25 to 35kts possible. Outside shot at some LLWS around daybreak and again toward sunset.

APX WATCHES/WARNINGS/ADVISORIES

MI...Freeze Warning until 8 AM EDT this morning for MIZ016>018- 021>024-027>030-033>036-041-042-099. Frost Advisory until 8 AM EDT this morning for MIZ026-032. MARINE...Small Craft Advisory from 11 AM this morning to 8 PM EDT this evening for LHZ345. Small Craft Advisory from 11 AM this morning to 11 PM EDT this evening for LHZ349. Small Craft Advisory from 11 AM this morning to 8 PM EDT this evening for LMZ323-341-342-344>346.