Great Lakes Forecast
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529
FZUS63 KMQT 132049
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
349 PM EST Sat Jan 13 2018

For waters beyond five 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 high pressure system of 30.8 inches over Iowa and
southern Minnesota this afternoon will extend a 30.6 inch ridge
across Lake Superior tonight as it drifts to the Ohio River Valley
by Sunday and New England by Sunday night. A 30.2 inch trough
over the northern Plains Sunday afternoon will consolidate into a
low over the western Great Lakes by Monday morning, then drift to
the eastern Great Lakes through Tuesday. A 30.7 inch high over the
central Plains on Tuesday will extend a 30.5 inch ridge across
Lake Superior Tuesday night before the high reaches the Ohio River
Valley Wednesday night. A 29.9 inch trough will stretch west to
east across far northern Ontario Wednesday and Thursday.

LSZ162-140500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
349 PM EST Sat Jan 13 2018 /249 PM CST Sat Jan 13 2018/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest late.
Isolated snow showers after midnight. Waves building to 2 to
4 feet.
.SUNDAY...Southwest winds 15 to 25 knots backing south. Isolated
snow showers in the morning, then snow showers in the afternoon.
Freezing spray in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots by midnight, then veering north late. Numerous
snow showers in the evening, then scattered snow showers after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. Scattered snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Heavy freezing spray. Scattered snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Scattered snow showers. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. Heavy freezing spray.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-140500-
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-
349 PM EST Sat Jan 13 2018

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Isolated snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then backing southwest late. Isolated snow
showers. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots backing south by mid
afternoon. Freezing spray. Scattered snow showers. Waves building
to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots diminishing to 5 to
15 knots late. Freezing spray in the evening. Snow showers. Waves
subsiding to 1 to 3 feet.
.MONDAY...Northeast winds 10 to 20 knots becoming north 20 to
30 knots in the afternoon. Snow showers. Freezing spray in the
afternoon. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Heavy freezing spray.
Snow showers. Waves building to 4 to 8 feet occasionally to
10 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Heavy freezing spray in the morning.
Snow showers. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Scattered snow showers. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 20 to 30 knots. Freezing spray. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-140500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
349 PM EST Sat Jan 13 2018

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then becoming west 10 to 20 knots late.
Isolated snow showers. Waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots backing south by mid
afternoon. Scattered snow showers. Freezing spray in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots diminishing to 5 to
15 knots late. Freezing spray in the evening. Snow showers. Waves
subsiding to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. Snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots becoming north
15 to 25 knots after midnight. Heavy freezing spray. Snow
showers. Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Heavy freezing spray in the morning.
Numerous snow showers in the morning, then scattered snow showers
in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Scattered snow showers. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 20 to 30 knots. Freezing spray. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-140500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
349 PM EST Sat Jan 13 2018

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Isolated snow
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots. Scattered snow showers.
Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing south by mid afternoon.
Scattered snow showers in the afternoon. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots diminishing to 5 to
15 knots. Snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Numerous snow showers. Waves building
to 2 to 4 feet.
.MONDAY NIGHT...East winds 15 to 25 knots backing northeast after
midnight. Snow showers. Freezing spray after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Freezing spray. Snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots. Scattered snow
showers. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. Heavy freezing spray.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-140500-
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-
349 PM EST Sat Jan 13 2018

...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 7 PM EST THIS
EVENING...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Heavy
freezing spray. Scattered snow showers. Waves 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by midnight. Freezing spray in the evening. Scattered
snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...Southwest winds 20 to 30 knots with a few gale force
gusts to 35 knots. Scattered snow showers. Freezing spray in the
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots late. Freezing
spray. Snow showers. Waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Southeast winds 15 to 25 knots becoming east 10 to
20 knots in the afternoon. Snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.MONDAY NIGHT...East winds 15 to 25 knots backing northeast after
midnight. Numerous snow showers. Freezing spray after midnight.
Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots. Freezing spray in the
morning. Snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Numerous snow showers in the
evening, then scattered snow showers after midnight. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West winds 20 to 30 knots. Freezing spray. Scattered
snow showers. Waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-140500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
349 PM EST Sat Jan 13 2018

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Freezing
spray. Numerous snow showers. Waves 4 to 7 feet occasionally to
9 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late.
Freezing spray in the evening. Scattered snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots becoming south 20 to
30 knots with a few gale force gusts to 35 knots by mid
afternoon. Isolated snow showers. Freezing spray in the afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots with a few gale force
gusts to 35 knots backing southeast late. Freezing spray.
Scattered snow showers in the evening. Numerous snow showers after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...Southeast winds 20 to 30 knots becoming east 15 to
25 knots in the afternoon. Freezing spray in the morning.
Numerous snow showers in the morning, then scattered snow showers
in the afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...East winds 15 to 25 knots backing northeast after
midnight. Numerous snow showers in the evening, then scattered
snow showers after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.TUESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. Scattered snow showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Numerous snow showers in the evening, then
scattered snow showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Scattered snow showers. Waves building
to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest. Waves
subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-140500-
MAFOR 1322/
Superior West 11630 13620 12530 11540 11447. Freezing spray
Sunday afternoon. Scattered snow showers. Waves 2 to 4 feet
tonight building to 3 to 6 feet Sunday.

Superior North Central 11730 12720 11610 11630 12540 11430.
Scattered snow showers Sunday morning. Waves 2 to 4 feet tonight
building to 3 to 6 feet Sunday.

Superior South Central...Heavy Freezing Spray Warning in effect...
11732 13630 13520 11440. Scattered snow showers this evening.
Waves 3 to 6 feet.

Superior East...Heavy Freezing Spray Warning in effect...12732
11720 11620 11630 12530 11440. Scattered snow showers. Waves 3 to
6 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



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