Great Lakes Forecast
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000
FZUS63 KMQT 191502
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EST Mon Feb 19 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 29.9 inch trough over eastern Lake Superior will
be pushed off to the southeast today by a 30.5 inch high pressure
moving across northern Ontario. Secondary troughing of 29.8
inches will push northeastward into the Western Great Lakes
Tuesday morning and reach southern Quebec Wednesday morning. A
high pressure system of 30.6 inches will push towards the Great
Lakes Wednesday afternoon and slowly shift into southern Quebec
through the day Thursday. A weak 30.1 inch trough will pass
across the western Great lakes on Friday followed by weak ridging
of 30.3 inches overnight.

LSZ162-192315-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EST Mon Feb 19 2018 /902 AM CST Mon Feb 19 2018/

.REST OF TODAY...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots late. Areas of blowing snow. Snow.
.TONIGHT...Northeast winds 20 to 30 knots. Heavy freezing spray
and areas of blowing snow. Numerous snow showers.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming northwest 5 to 15 knots
by mid afternoon. Patchy blowing snow in the morning. Snow
showers, possibly mixed with freezing rain in the morning, then a
chance of snow showers in the afternoon.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. A slight chance
of snow showers.
.WEDNESDAY...West winds 5 to 15 knots.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow showers.
.FRIDAY...Southwest winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-192315-
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-
1002 AM EST Mon Feb 19 2018

.REST OF TODAY...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots late. Areas of blowing snow. Scattered
snow showers late in the morning. Snow in the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
Numerous snow showers. A slight chance of freezing rain after
midnight.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming north 5 to 15 knots by
mid afternoon. Areas of blowing snow in the morning. Snow
showers, possibly mixed with freezing rain.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. A chance of snow
showers.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow showers.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of snow
showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-192315-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EST Mon Feb 19 2018

.REST OF TODAY...Northeast winds 20 to 30 knots. Areas of blowing
snow. A chance of snow late in the morning. Snow likely in the
afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
Numerous snow showers. A slight chance of freezing rain and
patchy freezing drizzle after midnight.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming north 5 to 15 knots by
mid afternoon. Areas of blowing snow. Snow showers, possibly
mixed with freezing rain.
.TUESDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow showers.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of snow showers in the
morning.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Snow
showers likely.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of snow
showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-192315-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EST Mon Feb 19 2018

.REST OF TODAY...North winds 20 to 30 knots veering northeast by
mid afternoon. Areas of blowing snow. Scattered snow showers late
in the morning. Snow in the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
A slight chance of freezing rain in the evening. Numerous snow
showers. Freezing rain likely after midnight.
.TUESDAY...Northeast winds 10 to 20 knots backing north. Freezing
rain likely in the morning. A chance of snow showers. A chance of
freezing rain in the afternoon.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance
of snow showers.
.WEDNESDAY...West winds 10 to 20 knots.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight.
.THURSDAY...South winds 5 to 15 knots. Snow showers likely.
.FRIDAY...West winds 5 to 15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-192315-
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-
1002 AM EST Mon Feb 19 2018

.REST OF TODAY...North winds 20 to 30 knots veering northeast.
Freezing spray in the afternoon. A chance of snow and a slight
chance of freezing drizzle late in the morning. Snow, possibly
mixed with freezing rain in the afternoon. Waves 3 to 5 feet
occasionally to 7 feet building to 7 to 10 feet occasionally to 13
feet.
.TONIGHT...Northeast winds 20 to 30 knots. Heavy freezing spray
and areas of blowing snow. Numerous snow showers, possibly mixed
with freezing rain. Waves building to 7 to 11 feet occasionally
to 14 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing north by mid afternoon.
Freezing spray in the morning. Freezing rain likely, possibly
mixed with snow showers. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
freezing rain in the evening. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Snow
showers likely. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest. A chance of
snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-192315-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EST Mon Feb 19 2018

.REST OF TODAY...North winds 15 to 25 knots becoming northeast
20 to 30 knots. A chance of freezing drizzle and a slight chance
of snow late in the morning, then snow, possibly mixed with
freezing rain in the afternoon. Areas of blowing snow in the
afternoon. Waves calm to 2 feet building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Northeast winds 20 to 30 knots becoming east 15 to
25 knots by midnight. Numerous snow showers in the evening.
Freezing rain likely. Isolated snow showers after midnight. Waves
5 to 8 feet occasionally to 10 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing north by mid afternoon. A
slight chance of snow showers in the morning. Freezing rain
likely. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of freezing rain in the
evening. A slight chance of snow showers. Heavy freezing spray
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Snow showers likely. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots becoming west 5 to 15 knots.
A chance of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-192315-
MAFOR 1916/
Superior West 11147 14147 11147 11137. Heavy freezing spray.
Waves omitted for mostly ice covered areas.

Superior North Central 11140 15147 11137. Chance of snow late
this morning. Waves omitted for mostly ice covered areas.

Superior South Central 12837 11137 12147 12130 11220. Chance of
snow late this morning. Chance of light freezing rain late this
evening. Chance of snow late tonight. Chance of snow showers late
Tuesday morning. Waves omitted for mostly ice covered areas.

Superior East 11141 11147 12157 12147 11242 11230. Chance of snow
late this morning. Chance of freezing drizzle or light freezing
rain late this evening through tonight. Freezing spray through
early evening, then heavy freezing spray from late evening through
late Tuesday morning, then freezing spray. Waves 3 to 5 feet
building to 6 to 9 feet this afternoon. Waves 7 to 10 feet
tonight, subsiding to 4 to 7 feet Tuesday morning.

$$

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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