Great Lakes Forecast
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FZUS63 KMQT 242053
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
353 PM EST Sat Feb 24 2018

Waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. Occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.SYNOPSIS...High pressure of 30.2 inches will shift east into
Quebec tonight and strengthen to 30.4 inches. A 29.5 inch low
pressure system will track northeast from the Central Plains into
the Western Great Lakes and deepen to 29.3 inches by sunrise and
29.1 inches as it exits to James Bay late Sunday. A high pressure
of 30.2 inches across the central Mississippi River Valley on
Sunday builds across the Lower Great Lakes on Monday. Meanwhile a
29.5 inch low moves across southern Manitoba and weakens to 29.8
inches as it moves across northern Ontario Tuesday. A 30.1 inch
ridge arrives over the Upper Great Lakes on Wednesday. On Thursday
a 29.1 inch low tracks across the Great Lakes region.

LSZ162-250500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
353 PM EST Sat Feb 24 2018 /253 PM CST Sat Feb 24 2018/

...GALE WARNING IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY
NIGHT...

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots.
.TONIGHT...East winds 20 to 30 knots. Snow.
.SUNDAY...West gales to 40 knots. A chance of snow.
.SUNDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming southwest 10 to 20 knots
late. A slight chance of snow showers in the evening.
.MONDAY...Southwest winds 5 to 15 knots.
.MONDAY NIGHT...Southwest winds 5 to 15 knots.
.TUESDAY...West winds 5 to 15 knots.
.TUESDAY NIGHT...West winds less than 10 knots veering northeast
after midnight.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-250500-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
353 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY
NIGHT...

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
by midnight. A chance of snow in the evening, then snow after
midnight.
.SUNDAY...West gales to 45 knots. A chance of snow.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots by midnight, then becoming southwest 15 to 25 knots
late. A slight chance of snow showers in the evening.
.MONDAY...Southwest winds 10 to 20 knots.
.MONDAY NIGHT...Southwest winds 5 to 15 knots.
.TUESDAY...West winds 5 to 15 knots.
.TUESDAY NIGHT...West winds less than 10 knots veering northeast
after midnight.
.WEDNESDAY...East winds 5 to 15 knots.
.THURSDAY...Northeast winds 15 to 25 knots backing north. A
chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-250500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
353 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY
NIGHT...

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots.
.TONIGHT...East winds 15 to 25 knots increasing to gales to
35 knots by midnight, then diminishing to 20 to 30 knots late. A
chance of snow in the evening, then snow after midnight.
.SUNDAY...Southeast gales to 45 knots with a few storm force
gusts to 50 knots. Snow in the morning, then a chance of snow in
the afternoon.
.SUNDAY NIGHT...West gales to 40 knots diminishing to 15 to
25 knots. A slight chance of snow showers.
.MONDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon.
.MONDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight.
.TUESDAY...West winds 10 to 20 knots.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots backing east after
midnight.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-250500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
353 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY
NIGHT...

.LATE THIS AFTERNOON...East winds 10 to 20 knots.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
by midnight, then becoming southeast with a few gale force gusts
to 35 knots late. A chance of snow in the evening, then snow
after midnight.
.SUNDAY...Southwest gales to 45 knots with a few storm force
gusts to 50 knots midday. Snow in the morning, then
a chance of snow in the afternoon.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 15 to
25 knots. A slight chance of snow showers in the evening.
.MONDAY...Southwest winds 10 to 20 knots backing south in the
afternoon.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. A chance of snow showers.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-250500-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
353 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM 1 AM EST SUNDAY THROUGH LATE
SUNDAY NIGHT...

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast gales to
40 knots by midnight. A slight chance of snow in the evening,
then snow after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.SUNDAY...South gales to 45 knots with a few storm force
gusts to 50 knots. Snow, possibly mixed with rain in the morning,
then a chance of snow in the afternoon. Waves subsiding to 3 to 6
feet occasionally to 8 feet, then building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY NIGHT...West gales to 40 knots diminishing to 20 to
30 knots late. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon. A slight chance of snow showers in the
morning. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 2 to 4 feet.
.THURSDAY...Northeast winds 20 to 30 knots backing north. Waves
building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-250500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
353 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM 1 AM EST SUNDAY THROUGH LATE
SUNDAY NIGHT...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast gales to
45 knots by midnight. Snow after midnight. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY...Southwest gales to 45 knots with a few storm force
gusts to 50 knots. Snow, possibly mixed with rain and drizzle in
the morning, then a chance of snow in the afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...West gales to 40 knots diminishing to 20 to
30 knots late. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots becoming south 10 to 20 knots
in the afternoon. A slight chance of snow showers in the morning.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 1 to 3 feet.
.THURSDAY...East winds 20 to 30 knots backing northeast. A chance
of snow showers. Waves building to 3 to 5 feet occasionally to
7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-250500-
MAFOR 2422/
Superior West...Gale Warning in effect...11120 11237 12247 11727
11650 12660. Chance of snow through early evening. Chance of snow
late Sunday. Waves omitted for mostly ice covered areas.

Superior North Central...Gale Warning in effect...11310 11230
11250 11257 11237 11567 12660. Chance of snow after midnight
tonight. Chance of snow Sunday afternoon. Waves omitted for mostly
ice covered areas.

Superior South Central...Gale Warning in effect...11310 11230
11350 11357 11437 11567 12660. Chance of snow late this evening.
Chance of snow late Sunday morning. Waves omitted for mostly ice
covered areas.

Superior East...Gale Warning in effect...11320 11340 11350 11367
11357 11567 12660. Chance of snow after midnight tonight. Chance
of snow Sunday afternoon. Waves 1 foot or less building to 7 to 11
feet tonight. Waves 6 to 9 feet building to 10 to 14 feet Sunday.


$$

KCW

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

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



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