Great Lakes Forecast
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FZUS63 KMQT 160805
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
405 AM EDT Mon Apr 16 2018

For waters beyond 5 nautical miles of shore on Lake Superior.

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 29.6 inch low over the Ohio Valley will deepen to
29.4 inches and reach Georgian Bay by late tonight. A brief ridge
of 30.0 inches will then move over the region Wednesday morning
after which another low of 29.5 inches will move out of the
Rockies into the central Plains, passing through the Great Lakes
late on Wednesday. A 30.3 inch high will then move over the
western Great Lakes by late Thursday, building to 30.5 inches over
Lake Superior on Friday.

LSZ162-161615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
405 AM EDT Mon Apr 16 2018 /305 AM CDT Mon Apr 16 2018/

...GALE WARNING IN EFFECT UNTIL 10 AM EDT /9 AM CDT/ THIS
MORNING...

.EARLY THIS MORNING...Northeast gales to 35 knots. Freezing
spray. A chance of snow. Waves 10 to 14 feet occasionally to
18 feet subsiding to 10 to 14 feet occasionally to 18 feet.
.TODAY...North winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon. Freezing spray through early afternoon. A
chance of snow. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming northeast 5 to 15 knots
late. A slight chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A slight chance of snow showers.
Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming south less
than 10 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds less than 10 knots backing northwest. Waves
2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-161615-
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-
405 AM EDT Mon Apr 16 2018

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.EARLY THIS MORNING...Northeast gales to 35 knots. Freezing
spray. Snow likely. Waves 10 to 14 feet occasionally to 18 feet
subsiding to 10 to 14 feet occasionally to 18 feet.
.TODAY...North gales to 35 knots diminishing to 20 to 30 knots in
the morning. Freezing spray through early afternoon. A chance of
snow. Waves subsiding to 5 to 8 feet occasionally to 10 feet, then
building to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots. Snow likely through
midnight, then a chance of snow after midnight. Waves building to
6 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. A slight chance of snow showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 5 to 15 knots becoming west less than
10 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds less than 10 knots veering southwest. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-161615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
405 AM EDT Mon Apr 16 2018

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.EARLY THIS MORNING...Northeast gales to 40 knots. Freezing
spray. Snow likely. Waves 10 to 14 feet occasionally to 18 feet
subsiding to 9 to 12 feet occasionally to 15 feet.
.TODAY...Northeast gales to 35 knots becoming north 20 to 30 knots in
the morning. Freezing spray. Snow. Waves subsiding to 7 to 10
feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Freezing spray through
midnight. Snow through midnight, then a chance of snow after
midnight. Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow showers. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots. A slight chance of
rain showers through midnight. A slight chance of snow showers.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...Northeast winds 20 to 30 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-161615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
405 AM EDT Mon Apr 16 2018

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.EARLY THIS MORNING...Northeast gales to 35 knots. Snow likely
and patchy freezing drizzle. Waves 9 to 12 feet occasionally to
15 feet subsiding to 7 to 10 feet occasionally to 13 feet.
.TODAY...North winds 20 to 30 knots. Freezing spray. Patchy
freezing drizzle through early afternoon. Snow. Waves subsiding to
6 to 9 feet occasionally to 11 feet, then building to 7 to 10
feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. A slight chance of
snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-161615-
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-
405 AM EDT Mon Apr 16 2018

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.EARLY THIS MORNING...Northeast gales to 35 knots. Freezing
spray. Snow and areas of freezing drizzle. Waves 8 to 11 feet
occasionally to 14 feet subsiding to 7 to 10 feet occasionally to
13 feet.
.TODAY...Northeast winds 20 to 30 knots. Freezing spray. Areas of
freezing drizzle through early afternoon. Snow. Waves 7 to 10
feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves building to 7 to 11
feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow showers. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. A slight chance of
rain and snow showers through midnight. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-161615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
405 AM EDT Mon Apr 16 2018

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.EARLY THIS MORNING...Northeast gales to 35 knots. Snow. Waves 5
to 8 feet occasionally to 10 feet.
.TODAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. Snow. Waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers through early
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots.
Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-161615-
MAFOR 1609/
Superior West...Gale Warning in effect...11151 11851 11841 12830
13840. Freezing spray this morning. Chance of snow this morning.
Chance of snow this evening. Waves 10 to 13 feet subsiding to 4
to 7 feet today. Waves 4 to 7 feet tonight.

Superior North Central...Gale Warning in effect...11157 11157
14847 11847 11840. Freezing spray. Patchy light freezing drizzle
this morning. Freezing spray this evening. Chance of snow late
tonight. Waves 8 to 12 feet subsiding to 7 to 10 feet today.
Waves 7 to 10 feet tonight.

Superior South Central...Gale Warning in effect...12157 15847.
Freezing spray this afternoon. Areas of light freezing drizzle,
then patchy light freezing drizzle late this morning. Waves 8 to
12 feet subsiding to 6 to 10 feet today. Waves 7 to 11 feet
tonight.

Superior East...Gale Warning in effect...12157 11137 12837 12847
11840. Freezing spray this morning today. Chance of snow
overnight. Waves 5 to 9 feet subsiding to 4 to 6 feet today.
Waves 5 to 8 feet tonight.

$$

Titus

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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