Marine Weather and Tide Forecast for Olmsted, IL

UPDATE
Issued at 524 PM CDT Fri Oct 16 2026

Updated Aviation discussion for 00Z TAF Issuance.

DISCUSSION
Issued at 135 PM CDT Fri Oct 16 2026

A large shortwave trof aloft swings through the region today and behind it upper ridging builds in. We have a tight sfc pressure gradient today behind last night/this morning's cold front. This is leading to breezy northwest winds today with gusts up to around 25 mph at times. Significantly cooler temperatures today as well as we struggle to get out of the 50s. Winds are expected to remain breezy through most of tomorrow along with highs that will likely hover right around 60.

Saturday night a potent sfc high slides through and off to the northeast by daybreak Sunday. With clear and calm to nearly calm conditions Saturday night, along with dewpoints in the 30s, we will likely see a first frost of the season across most of the CWA as lows dip into the 30s. There may even be some brief freezing temperatures in far west portions of the CWA A Frost Advisory will likely be needed.

With deep layer ridging in place for a little while, we can expect dry conditions and large diurnal temperature swings next week.
Sunday kicks off a warming trend that will bring temperatures back up to normal and slightly above normal for mid to late week. Highs will generally be in the 70s and lows will generally be in the 40s.

AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
Issued at 524 PM CDT Fri Oct 16 2026

Strong cold advection may agitate enough to produce -SHRA/-DZ to yield restricted vsbys along with the MVFR cigs/bases potential, at least for a few early evening hours; gusty nw winds continue likewise, before both ease off some overnight but linger nonetheless. Time/height cross sections suggest bases will scatter and clear by tmrw, particularly thru the planning phase hours of the forecast, as winds veer slightly thru the N/NE.

PAH WATCHES/WARNINGS/ADVISORIES
IL...None.
MO...None.
IN...None.
KY...None.