Marine Weather and Tide Forecast for Grand Beach, MI

DISCUSSION
Issued at 143 PM EDT Thu Mar 12 2026

Several powerhouse ~170 kt upper jets emanating from the north pacific will drive a couple strong storm systems through the region through early next week. Strong left exit upper forcing within the nose of the first jetlet will force a compact/vigorous shortwave, and associated sub-990 mb clipper, east through northern MI on Friday. An impressive wind field will accompany this powerful low later tonight into Friday with frequent advisory level gusts (45-55 mph) anticipated area-wide. Whether a few warning level gusts up to 60 mph can be achieved is the main point of contention for a Wind Advisory versus High Wind Warning. Initially from the southwest a ~70 kt 850 mb jet passes through from west to east later tonight into Friday morning. This largely produces advisory level gusts given the stability and more limited momentum transfer in these early morning LLJ/WAA regimes. However, the tail end of this does look to be into areas along/east of I-69 by late morning/early afternoon when more effective diurnal mixing could produce 50 kt plus gusts. Deepest mixing with less cloud cover and a more westerly component then into afternoon will keep the high winds going with 925 mb winds 45-50 kts.
Forecast soundings, particularly the GFS, support a High Wind Warning, while probabilistic data from the HRRR and NBM are more in line with a high end Advisory. Splitting hairs really with true warning level gradient wind events rare in these parts.
With all that said, per collaboration with surrounding offices, and the rather impressive soundings and momentum transfer progs, did opt for a High Wind Warning.

The next dynamic upper jet digs much more meridionally forcing a digging trough into the Central US Sunday, with eventually negative tilt liftout through the Ohio Valley and Great Lakes Sunday night into Monday. This will support a rapid cyclogenetic response with sfc low track northeast from MO/western IL Sunday PM to near Lake Huron by Monday. Leading warn advection wing may clip areas mainly near and north of the MI stateline with a brief period of snow (little to no accums) Saturday night north of the system warm front.
Warm sector then builds in during the day on Sunday with breezy/warm condition before the deepening low and cold front swings through with rain/wind and chances for thunderstorms late Sunday into Sunday night. Somewhat lacking low level moisture return and lapse rates will hopefully limit the threat for severe storms, though the degree of forcing/flow and potential for at least some weak instability makes this something to monitor going forward. Sharply colder/blustery air will wrap in later Sunday night into Monday with snow showers, especially in nw IN and sw MI where some lake enhancement may allow for accumulations/impacts. Track and intensity differences obviously linger at this forecast range in model land which will determine how windy/snowy conditions will be on the backside of this deep cyclone.

AVIATION /06Z TAFS THROUGH 06Z SATURDAY/
Issued at 135 AM EDT Fri Mar 13 2026

Strong and compact midlevel vort max currently approaching the Great Lakes. Best forcing for ascent passes just north of the area but a few sprinkles are possible (too warm for snow). Very dry low levels will keep conditions VFR through the period though. Main concern will be very strong winds through the day.
Momentum transfer supports frequent gusts to 45kts at KSBN and just shy of 50 kts at KFWA. Wind direction initially from the S/SW will steadily veer to WNW by late in the day. Expect the strongest gusts in the 15-18Z window with a direction of right around 260 degrees.

IWX WATCHES/WARNINGS/ADVISORIES
IN...High Wind Warning from 5 AM EDT /4 AM CDT/ early this morning to 8 PM EDT /7 PM CDT/ this evening for INZ005>009- 012>015-017-018-020-022>027-032>034-103-104-116-203-204- 216.
OH...High Wind Warning from 5 AM early this morning to 8 PM EDT this evening for OHZ001-002-004-005-015-016-024-025.
MI...High Wind Warning from 5 AM early this morning to 8 PM EDT this evening for MIZ078>081-177-277.
MARINE...Gale Warning until 5 AM EDT early this morning for LMZ043-046.
Gale Warning from 5 PM this afternoon to 11 PM EDT this evening for LMZ043-046.
Storm Warning from 5 AM early this morning to 5 PM EDT this afternoon for LMZ043-046.