Marine Weather and Tide Forecast for La Porte, IN

DISCUSSION
Issued at 118 AM EDT Thu Jun 18 2026

990mb surface low now pulling into the lower Great Lakes. Tight WNW gradient in its wake will yield breezy conditions today with gusts 25-30 mph through the afternoon (highest NE). Lagging midlevel vort max and low level cyclonic flow will support a few showers this morning (again best chances NE half) but won't amount to much. Cool WNW flow persists for quite a while and will keep highs in the 70s much of this period. Another weak shortwave passes on Sat with a few showers likely but weak forcing and limited moisture will keep coverage limited and amounts light.

A much stronger wave crosses the region on Sunday. Good right entrance jet dynamics and midlevel CVA will support a good low level response with 40+ kt LLJ, strong moisture convergence, and decent cyclogenesis for June standards. A swath of 1-2" of rain is likely with this system though models still oscillating in exact track.
Will have to keep an eye on instability values south of the low track given obvious high shear but for now paltry midlevel lapse rates and overall cool environment with low 60s surface dewpoints suggest a limited severe risk. More cool weather then continues into next week with a few low chances for light rain depending on shortwave tracks.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/
Issued at 622 AM EDT Thu Jun 18 2026

Minor CAA still expected to yield some brief MVFR ceilings at KSBN this morning before mixing out during the afternoon. MVFR is possible at KFWA but confidence is much lower. Skies clear and winds relax by late afternoon as high pressure settles into the region.

IWX WATCHES/WARNINGS/ADVISORIES
IN...Beach Hazards Statement through this evening for INZ103.
OH...None.
MI...Beach Hazards Statement through this evening for MIZ177-277.
MARINE...Small Craft Advisory until 4 PM EDT this afternoon for LMZ043- 046.