221
FZUS63 KMQT 220754
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 AM EDT Sun Sep 22 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 29.8 inch trough will sweep across Lake Superior
this morning. In its wake, 30.0 inch high pressure will build from
the Northern Plains into northern Ontario late Sunday and Monday.
On Tuesday, a 29.7 inch low pressure will track northeast to
lower Michigan while a weakening 29.8 inch trough lifts from
northern Minnesota into Ontario. 30.0 inch high pressure builds
over the Lower MS Valley Wednesday, building to 30.1 inches
Thursday. High pressure continues over the Great Lakes Friday.

LSZ162-221600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 AM EDT Sun Sep 22 2024 /254 AM CDT Sun Sep 22 2024/

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south in the
afternoon, then backing southeast late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ263-221600-
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-
354 AM EDT Sun Sep 22 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming south 5 to
15 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ264-221600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 AM EDT Sun Sep 22 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. A slight
chance of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then veering southeast late. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-221600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 AM EDT Sun Sep 22 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet building to 2 to 4 feet.
.TODAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms through early afternoon. Waves building to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight, then diminishing to 5 to 15 knots late. Waves subsiding
to 1 to 3 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-221600-
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-
354 AM EDT Sun Sep 22 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Showers
likely and a chance of thunderstorms. Waves 2 to 4 feet building
to 3 to 6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. A chance of showers and thunderstorms through early
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ267-221600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 AM EDT Sun Sep 22 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves 1 to 3 feet subsiding to calm to
2 feet.
.TODAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. Showers likely through early afternoon. A chance of
thunderstorms. A slight chance of showers by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots becoming north 15 to
25 knots after midnight, then becoming northeast 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.MONDAY...Northeast winds 10 to 20 knots backing north late.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering southeast
after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southeast.
Waves calm to 2 feet.

$$

LSZ261-221600-
MAFOR 2209/
Superior West 12730 12720 11620 11710 12810. Waves 3 to 5 feet
subsiding to 1 to 3 feet today. Waves 1 to 2 feet tonight.

Superior North Central 14730 11720 11710 12810. Waves 3 to 6 feet
subsiding to 2 to 4 feet today and to 1 to 3 feet tonight.

Superior South Central 14730 11730 11720 11820 11810. A chance of
showers this morning. Waves 1 to 2 feet building to 3 to 6 feet
today. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight.

Superior East 11526 11736 14730 11830 11820. A chance of
thunderstorms this morning. Waves 1 to 3 feet building to 4 to 7
feet today. Waves 3 to 6 feet tonight.

$$

WFO MQT

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

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