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KEY MESSAGES

-Seasonably warm temperatures continue through Monday.

-Temperatures fall back to normal this Tuesday with periodic shower chances by midweek next week.

DISCUSSION

Issued at 255 AM EDT Sat Oct 10 2026

Pattern Synopsis:

Midlevel heights begin to rise across the central U.S, supporting subsidence aloft and overall dry and quiet weather to build this weekend. Surface analysis depicts 1032mb high pressure centered over Northern Ontario while 996mb low pressure over Manitoba pushes a weak warm front across Northern Michigan. Warm air advection combined with a moderate pressure gradient across the Great Lakes Region will support near record-breaking temperatures today along with highs in the 70s through Monday with breezy southern flow.

The second half of the forecast period takes a sharp turn back to normal October temperatures as the aforementioned rigging pattern breaks down and quickly lowers heights across the Northern U.S. H8 temperatures, currently around 20 degrees, quickly fall back into the single digits, supporting highs in the 50s for most locations. At the same time, a small wave develops lee of the Canadian Rockies and progresses to the Great Lakes Region Monday night. Light showers will be observed across the CWA, but only a general tenth or less of QPF is expected. Another wave follows shortly behind and continues rain chances around the Thursday/Friday timeframe. Forecast Details:

Today, Sunday, and Monday: Conditions remain dry through the entirety of the weekend as any rain potential from the northern extent of Isaia's disheveled moisture plume remains confined to Southern Michigan and the Ohio Valley. Aforementioned warm air advection will commence this morning as pressure gradient force winds create breezy southern flow gusting well into the 20s. Temperatures appear to remain slightly lower compared to yesterday's guidance as a more southerly oriented fetch leads to less downslope heating. Regardless, near record breaking heat builds this afternoon with highs in the mid/upper 70s. The apex of aforementioned ridging breaks down this Sunday and slightly lowers temperatures around 70 this Sunday and Monday.

Tuesday through Friday Outlook: A midlevel weak wave originating from Northern Alberta develops surface low pressure with an apparent stationary boundary and digs across the Great Lakes region Monday night through Tuesday morning. Moisture tied to this system becomes cut off from its Pacific source and appears to be decaying as it transits across the Great Lakes Region, resulting in pretty marginal QPF amounts. Highest total rainfall amounts remain around a tenth inch for most parts of the CWA. Latest ensembles appear to have much less rainfall for beyond the midweek as longwave troughing with closed low pressure currently over the Pacific Northwest settles over the southwest U.S. next week and breaks down before reaching the northwoods. Some moisture and subsequent rainfall can still be expected at this time, but with much lower amounts compared to yesterday's guidance.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1259 PM EDT Sat Oct 10 2026

VFR. Gusty SSE to S winds through the rest of the afternoon, perhaps touching 30kts at times, especially CIU. Winds taper some in the evening, but with continued strong flow aloft, will see about 40-45kts of LLWS at 2,000ft... especially later overnight when surface winds trend even lower. LLWs to taper after 12z Sunday... Persistent southerly breeze to prevail, occasionally approaching 20kts through early afternoon.

APX WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...Small Craft Advisory until 6 AM EDT Sunday for LHZ345>349. Small Craft Advisory until 6 AM EDT Sunday for LMZ323-341-342- 344>346. Small Craft Advisory until 6 AM EDT Sunday for LSZ321-322.