Great Lakes Forecast
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059
FZUS63 KMQT 250301
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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...A 29.5 inch low pressure system will track northeast
over the Western Great Lakes overnight, deepening to 29.3 inches
by sunrise and 29.1 inches as it exits to James Bay late Sunday. A
high pressure of 30.1 inches across the central Mississippi River
Valley on Sunday builds across the Ohio Valley at 30.3 inches on
Monday. Meanwhile a 29.6 inch low moves across southern Manitoba
and weakens to 29.8 inches as it crosses 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.

LSZ162-251115-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EST Sat Feb 24 2018 /901 PM CST Sat Feb 24 2018/

...GALE WARNING IN EFFECT FROM 9 AM EST /8 AM CST/ SUNDAY THROUGH
LATE SUNDAY NIGHT...

.REST OF TONIGHT...East winds 20 to 30 knots with a few gale force
gusts to 35 knots. Snow.
.SUNDAY...West gales to 40 knots. A slight chance of snow in the
morning.
.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.

$$

LSZ263-251115-
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-
1001 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM 9 AM EST SUNDAY THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...East winds 20 to 30 knots with a few gale
force gusts to 35 knots. Snow.
.SUNDAY...Southwest gales to 45 knots with a few storm force gusts
to 50 knots midday. A slight 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.

$$

LSZ264-251115-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM 9 AM EST SUNDAY THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...East winds 20 to 30 knots with a few gale force
gusts to 35 knots. A chance of snow late in the evening, then
snow after midnight.
.SUNDAY...Southwest gales to 45 knots becoming west with a few
storm force gusts to 50 knots. Snow in the morning, then a slight
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.

$$

LSZ265-251115-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EST Sat Feb 24 2018

...GALE WARNING IN EFFECT FROM 9 AM EST SUNDAY THROUGH LATE
SUNDAY NIGHT...

.REST OF TONIGHT...East winds 20 to 30 knots with a few gale force
gusts to 35 knots, becoming southeast late. A chance of snow late
in the evening, then snow after midnight.
.SUNDAY...Southwest gales to 45 knots veering west. A slight
chance of snow.
.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.

$$

LSZ266-251115-
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-
1001 PM EST Sat Feb 24 2018

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

.REST OF TONIGHT...East winds 20 to 30 knots becoming southeast
gales to 45 knots by midnight. A chance of snow late in the
evening, then snow after midnight. Waves 2 to 4 feet building to
10 to 14 feet occasionally to 18 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.SUNDAY...South gales to 45 knots veering west, with a few storm
force gusts to 50 knots. A slight chance of snow. Waves subsiding
to 4 to 7 feet occasionally to 9 feet, then building to 9 to 12
feet occasionally to 15 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.

$$

LSZ267-251115-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EST Sat Feb 24 2018

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

.REST OF TONIGHT...Southeast winds 20 to 30 knots increasing to
gales to 40 knots by midnight. A slight chance of snow late in
the evening, then snow after midnight. Waves 2 to 4 feet building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to 9
feet occasionally to 11 feet.
.SUNDAY...Southwest gales to 45 knots veering west by mid
afternoon with a few storm force gusts to 50 knots. A slight
chance of rain and drizzle in the morning. A chance of snow. Waves
subsiding to 4 to 7 feet occasionally to 9 feet, then building to
8 to 11 feet occasionally to 14 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.

$$
LSZ261-251115-
MAFOR 2504/
Superior West...Gale Warning in effect...12247 11427 11650 12660
11650 11640. Chance of snow through mid morning Sunday. Waves
omitted for mostly ice covered areas.

Superior North Central...Gale Warning in effect...11250 11257
11347 11567 12660 11660 11650. Chance of snow late this evening.
Chance of snow late Sunday morning. Waves omitted for mostly ice
covered areas.

Superior South Central...Gale Warning in effect...12357 11427
11560 11660 11660 12650. Waves omitted for mostly ice covered
areas.

Superior East...Gale Warning in effect...11360 12367 11567 13660
11650. Chance of snow late Sunday morning. Chance of snow late
Sunday. Chance of snow showers Sunday evening. Waves 3 to 6 feet
building to 9 to 12 feet overnight. Waves 7 to 10 feet building
to 9 to 12 feet Sunday, then subsiding to 7 to 10 feet Sunday
evening.


$$

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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