000
FZUS63 KMQT 150802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Mon Apr 15 2024

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 29.9 inch high pressure ridge extending southeast
into the Upper Mississippi Valley early this morning will build
further to 30.1 inches as it shifts across the Upper Great Lakes
later today and tonight. On Tuesday, the ridge at 30.3 inches
will extend from Hudson Bay to the Lower Great Lakes while deep
low pressure of 29.2 inches lifts northeast across the central
Plains. This low will then weaken to 29.5 inches as it tracks to
Wisconsin on Wednesday. The low will continue to weaken as it
moves across Lower Michigan Wednesday night, and on Thursday, it
will become a 29.9 inch trough extending from southern Ontario to
a 29.5 inch low pressure over far northern Ontario. Also on
Thursday, a 30.2 inch high pressure ridge will build southeast
into the Plains. On Friday, the ridge will remain nearly
stationary as it builds to 30.3 inches while the low deepens to
29.4 inches as it moves over southern Hudson Bay.

LSZ162-151615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Mon Apr 15 2024 /302 AM CDT Mon Apr 15 2024/

...GALE WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then becoming east 10 to 20 knots late. Waves building
to 2 to 4 feet.
.TUESDAY...East winds 15 to 25 knots increasing to gales to
35 knots in the afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.TUESDAY NIGHT...East gales to 40 knots. Rain showers. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northeast gales to 35 knots early then becoming winds
20 to 30 knots. Rain showers. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots becoming west 10 to
20 knots after midnight. Rain showers likely through midnight.
Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.FRIDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

$$

LSZ263-151615-
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-
402 AM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible. Waves building to
6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...East gales to 35 knots. A chance of rain showers
through midnight, then rain showers after midnight. Waves
subsiding to 5 to 8 feet occasionally to 10 feet, then building
to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY...East gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Rain showers. Waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots becoming west 10 to
20 knots after midnight. Rain showers through midnight, then a
chance of rain showers after midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-151615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 5 to 15 knots backing west late. Waves
subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming northwest less than
10 knots after midnight, then becoming northeast 5 to 15 knots
late. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East gales to 35 knots. A slight chance of rain
showers through midnight, then rain showers likely after
midnight. Waves building to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY...East gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Rain showers. Waves building to 11 to 15 feet
occasionally to 19 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots becoming west 10 to
20 knots after midnight. Rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots veering northwest. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-151615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TODAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering north late. Waves
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west after midnight,
then veering northeast late. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots. A chance of rain
showers through midnight, then rain showers after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...East gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Rain showers. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering west after
midnight. Rain showers through midnight, then a chance of rain
showers after midnight. Waves 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.
.FRIDAY...West winds 20 to 30 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-151615-
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-
402 AM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight, then veering northeast late. Waves subsiding to calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. A slight chance of rain showers through
midnight, then rain showers likely after midnight. Waves building
to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...East gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Rain showers. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-151615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...West winds 10 to 20 knots veering northwest in the
afternoon. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northeast late. Waves
subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of rain showers after midnight.
Waves building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Southeast gales to 35 knots. Rain showers. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...Southeast winds 15 to 25 knots. Rain showers.
Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-151615-
MAFOR 1509/
Superior West 12710 11600 11500 11400 11300 11200 11210. Waves 2
feet or less.

Superior North Central 13710 14600 11800. Waves 1 to 3 feet
today. Waves 1 foot or less tonight.

Superior South Central 11610 13710 11700 12600 11700. Waves 1 to
3 feet today. Waves 2 feet or less tonight.

Superior East 11610 12710 12720 12710 11810. Waves 2 to 4 feet.

$$

Voss

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

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