Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

639
FZUS63 KMQT 190247
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 PM EST Thu Jan 18 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 29.7 inch trough crossing Lake Superior will move
east overnight. A 29.3 inch low pressure will then develop across
southern Manitoba Friday and track eastward to central Quebec by
midday Saturday. Early Sunday morning, a 29.6 inch low over the
Colorado Rockies will eject into the central Plains and deepen to
29.3 inches as it moves across the western Great Lakes late
Monday. The low will reach Quebec on Tuesday with an area of high
pressure averaging 30.3 inches developing over Saskatchewan and
Manitoba.

LSZ162-191100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 PM EST Thu Jan 18 2018 /847 PM CST Thu Jan 18 2018/

.REST OF TONIGHT...West winds 5 to 15 knots backing southwest by
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Flurries in the morning.
Sprinkles and a slight chance of drizzle. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots by midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of rain in the morning. A chance of
snow. Rain likely in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Snow. Freezing spray after midnight.
Waves building to 7 to 10 feet occasionally to 13 feet.
.MONDAY...Northeast gales to 40 knots backing north. Freezing
spray. Snow. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-191100-
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-
947 PM EST Thu Jan 18 2018

.REST OF TONIGHT...West winds 5 to 15 knots backing southwest by
midnight, then increasing to 10 to 20 knots late. Areas of fog.
Waves 1 to 3 feet building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Areas of fog. Flurries in the morning.
Sprinkles and a slight chance of drizzle. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. Waves 1 to 3 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of snow. A chance of rain in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...East winds 20 to 30 knots. Snow. Waves building
to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northeast gales to 40 knots backing north. Rain, snow.
Freezing spray. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North gales to 35 knots diminishing to 15 to 25 knots.
Freezing spray. Snow likely, then a chance of snow. Waves
subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-191100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 PM EST Thu Jan 18 2018

.REST OF TONIGHT...West winds 5 to 15 knots backing southwest by
midnight, then increasing to 10 to 20 knots late. Widespread fog.
Flurries. Waves 1 to 3 feet building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. Widespread fog. Flurries in the
morning. A chance of drizzle. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. A slight chance of
rain in the evening. Waves 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Freezing spray. Snow. Waves building to
5 to 8 feet occasionally to 10 feet.
.MONDAY...East gales to 35 knots becoming northeast gales to
40 knots. Freezing spray. Snow. Waves building to 8 to 12 feet
occasionally to 15 feet.
.TUESDAY...North gales to 40 knots diminishing to 20 to 30 knots.
Heavy freezing spray. Snow likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-191100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 PM EST Thu Jan 18 2018

.REST OF TONIGHT...West winds 10 to 20 knots backing southwest by
midnight. Flurries late in the evening. Areas of fog. Waves calm
to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest by late
morning, then diminishing to 5 to 15 knots by mid afternoon.
Widespread fog. Flurries. Sprinkles and a slight chance of
drizzle in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. Waves building to 1 to
3 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of snow. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Snow. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...East winds 20 to 30 knots becoming north gales to
35 knots. Rain, snow. Freezing spray. Waves building to 6 to
10 feet occasionally to 13 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. Heavy freezing spray. Snow likely. Waves subsiding to
3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-191100-
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-
947 PM EST Thu Jan 18 2018

.REST OF TONIGHT...West winds 5 to 15 knots becoming southwest
10 to 20 knots late. Areas of fog. A slight chance of freezing
drizzle late in the evening. Flurries. Waves 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south by late
morning, then veering southwest by mid afternoon. Widespread fog.
A chance of drizzle and flurries. A slight chance of sleet in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight. A slight chance of rain in the evening. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. A chance of snow. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow likely in the evening, then snow
after midnight. Waves building to 5 to 8 feet occasionally to
10 feet.
.MONDAY...East winds 20 to 30 knots becoming northeast gales to
40 knots. Snow, possibly mixed with rain. Freezing spray. Waves
building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 35 knots backing northwest. Freezing
spray. Snow likely. Waves subsiding to 5 to 8 feet occasionally
to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-191100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 PM EST Thu Jan 18 2018

.REST OF TONIGHT...West winds 10 to 20 knots backing southwest by
midnight. Areas of fog. A slight chance of freezing drizzle.
Flurries after midnight. Waves calm to 2 feet building to 1 to
3 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Patchy fog in the morning. Flurries in the morning,
then a chance of drizzle and a slight chance of sleet in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots veering west by
midnight, then diminishing to 15 to 25 knots late. A slight
chance of rain and snow in the evening. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. A chance of snow. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...East gales to 35 knots diminishing to 20 to 30 knots.
Snow, possibly mixed with rain. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 20 to 30 knots. Freezing spray. Snow.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-191100-
MAFOR 1904/
Superior West 13520 14530 11630. Waves 1 to 3 feet overnight
building to 3 to 6 feet Friday.

Superior North Central 11513 12523 12533 11523 11533 11640.
Chance of drizzle Friday afternoon. Waves 1 to 3 feet overnight
building to 3 to 6 feet Friday.

Superior South Central 11613 12510 11420 11423 12523 11530.
Patchy fog through mid morning Friday. Waves 1 to 3 feet.

Superior East 11623 11523 11520 11523 11420 11520 12530. Patchy
fog. Chance of rain and drizzle. Waves 2 to 5 feet.

$$

Borchardt

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

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



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.