149
FZUS63 KMKX 191410
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
910 AM CDT Sun Jul 19 2026

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.

Waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.SYNOPSIS...

Wildfire smoke currently overspreads Lake Michigan, with areas of
denser smoke reducing visibility to 1 nautical mile at times. A
Marine Dense Smoke Advisory is in effect across Lake Michigan into
early Monday morning.

Relatively light and variable winds expected to continue today
underneath high pressure around 30.0 inches. High pressure exits
southeastward tonight, with 29.4 inch low pressure tracking
southeastward across Manitoba and Ontario Canada tonight into
Monday. South to southwest winds build across the lake tonight,
becoming gusty into Monday. A few gusts to gale force will be
possible Monday afternoon and evening over the northern half of
the lake. Strong to severe thunderstorms will also be possible
Monday afternoon through Monday night across the lake.

A cold front crosses the lake Monday night into Tuesday morning.
Winds veer northwest and become gusty again as it passes. Winds
veer due north later Tuesday into Tuesday night with a few gusts
to gale force possible.

LMZ261-362-364-366-563-565-567-868-192130-
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and north of a line from Charlevoix MI to South
Fox Island 5 NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to
Mid Lake-
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to
Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid
Lake-
910 AM CDT Sun Jul 19 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 AM CDT MONDAY...

.REST OF TODAY...Northeast winds 5 to 10 kt becoming east late
this morning, then veering to south 10 to 20 kt early this
afternoon becoming southwest late. Areas of smoke through mid
morning, then patchy smoke this afternoon. Waves 1 to 2 ft.
.TONIGHT...Southwest winds 10 to 20 kt increasing to 15 to 25 kt.
Patchy smoke. Chance of showers overnight. Waves 2 to 4 ft.
.MONDAY...Southwest winds 15 to 25 kt becoming south to around 30
kt. A few gusts to gale force possible late. Areas of smoke in
the morning, then patchy smoke in the afternoon. Chance of showers
and thunderstorms in the afternoon. Waves 2 to 4 ft building to 6
to 9 ft occasionally to 12 ft.
.MONDAY NIGHT...South winds to 30 kt becoming southwest. A few
gusts to gale force possible. Patchy smoke in the evening.
Showers with a chance of thunderstorms in the evening, then chance
of showers and thunderstorms overnight. Waves 6 to 9 ft
occasionally to 12 ft.
.TUESDAY...Northwest winds to 30 kt increasing to gales to 35 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY NIGHT...North gales to 35 kt. Waves 7 to 10 ft
occasionally to 13 ft.
.WEDNESDAY...North winds to 30 kt. Waves 6 to 9 ft occasionally
to 12 ft.
.THURSDAY...West winds 10 to 20 kt becoming southwest 15 to
25 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-192130-
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM
offshore to Mid Lake-
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5 NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5 NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM
offshore to Mid Lake-
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid
Lake-
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to
Mid Lake-
910 AM CDT Sun Jul 19 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 7 AM CDT MONDAY...

.REST OF TODAY...Northeast winds 5 to 10 kt increasing to 10 to
20 kt early this afternoon, then becoming north late. Areas of
smoke through mid morning, then patchy smoke this afternoon.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.TONIGHT...North winds 10 to 20 kt veering to southeast 5 to
10 kt late in the evening, then becoming south after midnight
becoming south 10 to 15 kt late. Patchy smoke. Waves 1 to 2 ft.
.MONDAY...Southwest winds 10 to 20 kt becoming south to 30 kt.
Areas of smoke in the morning, then patchy smoke in the
afternoon. Waves 1 to 3 ft building to 5 to 8 ft occasionally to
10 ft.
.MONDAY NIGHT...Southwest winds to 30 kt. Patchy smoke in the
evening. Showers with a chance of thunderstorms in the evening,
then showers likely with a chance of thunderstorms overnight.
Waves 5 to 8 ft occasionally to 10 ft.
.TUESDAY...West winds to 30 kt becoming northwest. Waves 5 to
8 ft occasionally to 10 ft.
.TUESDAY NIGHT...North gales to 35 kt diminishing to 30 kt. Waves
8 to 11 ft occasionally to 14 ft.
.WEDNESDAY...North winds to 30 kt. Waves 8 to 11 ft occasionally
to 14 ft subsiding to 7 to 10 ft occasionally to 13 ft.
.THURSDAY...West winds 10 to 15 kt becoming south 10 to 20 kt.
Waves 1 to 3 ft.

$$

LMZ761-192130-
MAFOR 1916/
MICHIGAN NORTH 11410 12520 11420 12520 12530. A chance of showers
overnight. Waves 1 foot or less this afternoon. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet Monday morning.

MICHIGAN SOUTH 11120 11820 11720 11210 11400 11410 12520. Waves 1
to 3 feet this afternoon. Waves 2 feet or less tonight. Waves 1
to 3 feet Monday morning.

$$


Sheppard

Experimental modernized open lake forecast is available online at
weather.gov/mkx/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes