Marine Weather and Tide Forecast for Michigan City, IN

DISCUSSION
Issued at 200 PM EDT Sun May 24 2026

Showers and a few embedded thunderstorms just west of the Interstate 69 corridor in northern IN and southwest MI as of 18z will continue to track east through the remainder of the forecast area this afternoon into early this evening. The bulk of this activity is anchored to a surface trough enhanced by a shortwave and associated weak 30 kt mid level jetlet lifting east-northeaset through the lower Great Lakes. Skinny/tall CAPE and near 1.50 inch precipitable water values will likely support some heavier downpours and a few lightning strikes. Marginal instability and weak lapse rates will act to keep any convection well below severe limits.

A drier, subsident air mass will filter in tonight through Tuesday behind today's system with high pressure generally in control. Fog will be possible early Monday given lingering near sfc moisture, light winds and mainly clear skies. Sunnier skies in this regime will allow for warmer daytime highs in the upper 70s to mid 80s, warmest on Tuesday.

A rather stagnant, near Omega blocking pattern settles in midweek into next weekend in the mid to upper levels, with troughing into the northwest US and anomalous ridging in the Upper Midwest and south-central Canada. This transition does send a backdoor cold front south toward the area on Wednesday, while at the same time a moisture-laden 700mb impulse and warm front attempts to lift north toward the US 30 corridor. These features will bring low chances (10- 30%, highest south of US 30) for showers and a few storms on Wednesday, with the remainder of the week/weekend likely dry with seasonable temps and lower humidity as the merged fronts likely settle off to the southwest.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/
Issued at 118 AM EDT Mon May 25 2026

Mainly VFR conditions over the next few hours, then expect BR/FG and/or low ceiling development overnight at both terminals, with IFR/LIFR conditions expected (especially at KSBN). VLIFR visibilities are possible at both KSBN and KFWA, but felt more confident in KSBN dropping to 1/4SM so have a tempo between 9-12z dropping to 1/4SM BKN003. For now, kept KFWA LIFR just at/above airfield landing minimums. Expect calm/variable winds overnight shifting east- southeast through the morning at both sites, with improvement to MVFR after sunrise and then becoming VFR after 14z Mon.

IWX WATCHES/WARNINGS/ADVISORIES
IN...Dense Fog Advisory until 9 AM EDT /8 AM CDT/ this morning for INZ005>009-012-014-103-104-116-203-204-216.
OH...Dense Fog Advisory until 9 AM EDT this morning for OHZ001.
MI...Dense Fog Advisory until 9 AM EDT this morning for MIZ078>081- 177-277.
MARINE...Dense Fog Advisory until 10 AM EDT this morning for LMZ043-046.