000
FZUS63 KMQT 140203
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1003 PM EDT Sat Apr 13 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 from Hudson
Bay southward across Lower Michigan will weaken to 29.8 inches as
it shifts to the Lower Great Lakes overnight. Meanwhile, low
pressure of 29.6 inches located just northwest of the Twin Cities
will track east, crossing the Upper Great Lakes early Sunday
morning and reaching the Lower Great Lakes by Sunday evening. In
its wake, 30.0 inch high pressure over the Prairie Provinces will
extend 29.8 inch ridging into the Upper Mississippi Valley during
Sunday afternoon. This ridge will build to 30.1 inches as it
shifts across the Upper Great Lakes during Sunday night and
Monday. On Tuesday, the ridge at 30.2 inches will extend from
Hudson Bay to the Lower Great Lakes while deep low pressure of
29.1 inches lifts northeast across the central Plains. This low
will then weaken to 29.4 inches as it tracks to Wisconsin on
Wednesday, and it will weaken further to 29.7 inches as it moves
over northern Ontario on Thursday. In its wake, a 30.2 inch high
pressure ridge will build southeast across the Plains to the Mid-
Mississippi Valley during Thursday and Thursday night.

LSZ162-141015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1003 PM EDT Sat Apr 13 2024 /903 PM CDT Sat Apr 13 2024/

.REST OF TONIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Scattered rain showers ending.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then becoming south 5 to 15 knots
late. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming south 10 to 20 knots
by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of rain showers. Waves building
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...East gales to 40 knots. A chance of rain showers
through early afternoon, then rain showers likely by mid
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.TUESDAY NIGHT...East gales to 40 knots becoming northeast 20 to
30 knots after midnight. Rain showers. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots backing west. Rain
showers, then a chance of rain showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ263-141015-
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-
1003 PM EDT Sat Apr 13 2024

.REST OF TONIGHT...East winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Scattered rain showers ending.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A chance of rain showers. Waves
building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...East gales to 35 knots. Rain showers. Waves
building to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...East gales to 35 knots becoming west 15 to 25 knots.
Rain showers, then a chance of rain showers. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of rain showers,
possibly mixed with snow. Waves subsiding to 2 to 4 feet.

$$

LSZ264-141015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1003 PM EDT Sat Apr 13 2024

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing east
after midnight. Scattered rain showers ending. Waves calm to 2
feet building to 1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots backing west late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers. Waves building to
5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...East gales to 40 knots. Rain showers. Waves
building to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...East gales to 40 knots becoming west 15 to 25 knots.
Rain showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of rain showers.
A chance of snow showers. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-141015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1003 PM EDT Sat Apr 13 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots backing east
after midnight, then diminishing to 5 to 15 knots late. Rain
showers ending. Waves calm to 2 feet building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming north 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Rain showers. Waves building to 7 to
10 feet occasionally to 13 feet.
.WEDNESDAY...Southeast gales to 35 knots veering west. Rain
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves subsiding to 1 to 3 feet.

$$

LSZ266-141015-
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-
1003 PM EDT Sat Apr 13 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots backing east
late. Rain showers ending late. Waves calm to 2 feet building to
1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East gales to 40 knots. Rain showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Southeast gales to 40 knots becoming west 20 to
30 knots. Rain showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots. A chance of rain showers.
A chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-141015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1003 PM EDT Sat Apr 13 2024

.REST OF TONIGHT...South winds 5 to 15 knots backing southeast
after midnight, then increasing to 10 to 20 knots late. Rain
showers ending late. Waves 1 to 3 feet subsiding to calm to 2
feet, then building to 1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 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 chance of rain showers through
midnight, then rain showers after midnight. Waves building to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Southeast gales to 35 knots becoming west 20 to
30 knots. Rain showers, then a chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves subsiding to 2 to 4 feet.

$$
LSZ261-141015-
MAFOR 1403/
Superior West 11120 12110 11800 11700 13500. Waves 1 to 3 feet.

Superior North Central 11310 12210 11110 11800 11710 12610. Waves
1 to 3 feet.

Superior South Central 11326 11310 11210 11810 13710 11600. Waves
1 to 3 feet.

Superior East 11316 12310 11210 11800 12710 11610. Waves 1 to 3
feet.

$$

Rolfson

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

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