Mackinac Island, MI Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Mackinac Island, MI

April 15, 2024 9:35 PM EDT (01:35 UTC) Change Location
Sunrise 6:47 AM   Sunset 8:27 PM
Moonrise 10:49 AM   Moonset 2:40 AM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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Marine Forecasts
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LHZ345 Straits Of Mackinac Within 5 Nm Of Mackinac Bridge Including Mackinac Island- 332 Pm Edt Mon Apr 15 2024

Through early evening - Northwest wind 10 to 15 knots. Sunny. Waves 2 feet or less.

Tonight - Northwest wind 5 to 10 knots. Clear. Waves 2 feet or less.

Tuesday - East wind 10 to 15 knots. Sunny. Waves 2 feet or less.

Tuesday night - East wind to 45 knots. Rain showers likely. Waves 6 to 9 feet.

Wednesday - East wind to 45 knots. Rain showers. Waves 7 to 10 feet.
see the open lakes forecast for days 3 through 5.

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7 Day Forecast for Marine Location Near Mackinac Island, MI
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Area Discussion for - Gaylord, MI
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Area Forecast Discussion National Weather Service Gaylord MI 934 PM EDT Mon Apr 15 2024


- Little weather tonight/Tuesday prior to arrival of next system.

- Elevated fire danger Tuesday afternoon inland from Lake Huron.

- Widespread measurable rain and gusty winds likely Wednesday.

Issued at 934 PM EDT Mon Apr 15 2024

Leftover diurnal cu has dissipated, and skies are clear this evening. Some initial pieces of cirrus are just upstream, over ne WI and western upper MI. This will eventually result in partly cloudy skies overnight in our sw areas (FKS/CAD/MBL).
Mostly clear elsewhere. Some upper 20s in interior cold spots, but most places will be in the 30s.

Pattern Synopsis/Forecast: Split flow across western North America...consolidating again over the Plains with a low amplitude short wave ridge moving through central Canada ahead of a short wave trough moving into British Columbia in the northern branch...with a stronger closed low in the southern branch over the Four Corners. Cooler/drier air filtering into the Great Lakes on deep layer northwesterly flow...with deeper moisture suppressed south of Michigan. Early afternoon surface analysis shows high pressure over Manitoba ridging southeast across the Great Lakes...frontal boundary stretches from the mid Atlantic west along the Ohio River/southern Illinois/central Missouri. High based Cu in horizontal rolls across northeast Lower and a band of clouds (and some high based radar returns) along the southeast Upper shoreline likely enhanced by the lake breeze.

Height rises associated with upstream short wave ridge will spread across the Great Lakes tonight as southern branch upper low works its way into the central Plains. Surface ridge will remain across Michigan tonight and then shifts east Tuesday allowing for an increase in easterly boundary layer flow across northern Michigan.

Primary Forecast Concerns:

Little weather tonight/Tuesday prior to arrival of next system: High pressure at the surface and aloft will allow for one more dry day Tuesday before rain arrives Tuesday night. Skies will clear this evening with some increase in mid/high clouds on Tuesday...another afternoon of mostly above normal highs especially northwest Lower where downsloping east winds will help (cooler near the Lake Huron shoreline). East winds will increase during the day with gusts 15 to 25 mph west of I-75 in the afternoon.

Elevated fire danger Tuesday afternoon inland from Lake Huron: Increasing east winds and dew points falling into the 20s expected to result in relative humidity values below 30% during the afternoon away from the moderating influence of easterly winds off Lake Huron.
Combined with lowering fuel moisture fire danger will increase Tuesday afternoon.

Pattern Synopsis and Forecast: Late Tuesday night a stacked system will approach MI/WI. East winds near the surface will strengthen and become breezy to gusty overnight while rain chances spread over northern MI. Wednesday morning east to southeast winds will be gusty with intermittent light to moderate rain over the state. A few model soundings hint at a few hundred J/kg of elevated instability (on top of a warm nose). A few rumbles of thunder could be embedded within stratiform rain Wednesday morning, however the center of the low approaches northern WI during the afternoon and moves a cold front over the CWA from SW to NE. This could provide the lift needed to tap into that elevated instability along the front.
Some CAMs that initially capture Wednesday are hinting at a broken line of minor convection moving through northern lower.
This could aid in mixing down gusty winds to the surface, produce some lightning, and possibly localized and brief moderate to heavy rainfall. Winds turn west and diminish overnight into Thursday morning.

Cooler temperatures and breezy afternoons for the end of the work week, with slight chances for a quick burst of snow showers Friday over eastern upper and the tip of the mitt. A broad upper level low will move over Ontario CA and keep temperatures around 5 to 15 degrees below normal for next weekend.

Primary Forecast Concerns/Key Messages: The main focus for this period falls mostly on Wednesday with our next system. There is fairly high confidence in the track of the low up until it reaches MN/WI, then there is a spread of where it could land. Some ensemble members take the track up to northern WI and some over eastern MI.
CAMS are just starting to trickle in, and hint at the track some where in the middle. No matter the detail of the exact track, this range will result in some kind of rain and breezy to gusty winds for northern MI (especailly northern lower). PW values at the moment are around 0.8-1" which is at or even slightly over the 90th percentile for mid April. This is sufficient for a widespread soak, with exact amounts still up in the air. The surface pressure gradient will tighten Wednesday (around 8 to 13 mb gradient over northern lower), however the stronger winds aloft (~850mb) will be early Wednesday.
This could result in gusty winds early Wednesday morning, and strengthening sustained winds with more mild gusts through the afternoon hours. Its too early for exact amounts, however at this time there is a lower chance for this system's winds to be as strong as last weeks system. We will be watching this.


Relatively dry air remains in place into Tuesday, as high pressure passes well to our north. There will be some increase in cloud cover Tuesday, especially late. VFR expected.

Nnw winds will weaken this evening. An east breeze develops Tuesday.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
MACM4 - 9075080 - Mackinaw City, MI 8 mi48 min NW 8G9.9 48°F 42°F30.0635°F
SRLM4 26 mi36 min NNW 18 46°F 33°F
RCKM4 - 9076024 - Rock Cut, MI 36 mi48 min NW 8.9G13 42°F30.04
WNEM4 - 9076027 - West Neebish, MI 37 mi48 min NW 8.9G15 44°F 42°F30.0531°F
DTLM4 - 9075099 - De Tour Village, MI 39 mi48 min NNW 7G13 45°F 39°F30.0435°F
PTIM4 - 9099004 - Point Iroquois, MI 43 mi48 min 0G1.9 38°F 30.0835°F
LTRM4 - 9076032 - Little Rapids, MI 46 mi48 min WNW 11G14 42°F 40°F30.0433°F
NABM4 - Naubinway, MI 46 mi56 min N 8G11 48°F 30.08
SWPM4 - 9076070 - S.W. Pier, MI 46 mi48 min NW 9.9G15 41°F 38°F30.05

Wind History for Mackinaw City, MI
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KMCD MACKINAC ISLAND,MI 1 sm20 minNNW 0810 smClear46°F30°F53%30.10
KSLH CHEBOYGAN COUNTY,MI 15 sm20 minNW 0710 smClear45°F30°F57%30.10
KPLN PELLSTON RGNL AIRPORT OF EMMET COUNTY,MI 22 sm41 minNNW 0910 smClear48°F28°F46%30.10
Link to 5 minute data for KMCD

Wind History from MCD
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Tide / Current for
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Weather Map
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GEOS Local Image of great lakes   

Gaylord, MI,

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