114
FZUS63 KMQT 011953
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
353 PM EDT Wed May 1 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 29.7 inch low pressure currently over far eastern Lake
Superior continues drifting towards southwest Quebec tonight,
weakening to 29.8 inches. Ridging builds to 30.1 inches over the
Upper Great Lakes tonight, then shifts east on Thursday as a 29.7
inch low pressure tracks across the Upper Mississippi Valley. The
low then lifts north over northwestern Ontario Friday. A weak 30.0
inch trough pivots across the lake Saturday morning ahead of
ridging that builds to 30.1 inches by Saturday evening; this
ridging persists through Sunday. The ridging leaves the Upper
Great Lakes Monday as a deepening low lifts off of the Northern
Rockies into the Northern Plains.

LSZ162-020400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
353 PM EDT Wed May 1 2024 /253 PM CDT Wed May 1 2024/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight, then veering east late. Waves subsiding to calm to
2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 20 to
30 knots. A slight chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots. Rain showers through midnight, then a chance of rain
showers after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing east. Waves calm
to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ263-020400-
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-
353 PM EDT Wed May 1 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight, then diminishing to less than 10 knots late. Patchy fog
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots late. A chance of rain showers by mid afternoon. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots increasing to 20 to
30 knots. Rain showers and a slight chance of thunderstorms
through midnight, then a chance of rain showers after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A slight chance of rain
showers through early afternoon. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of rain
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of rain showers. Waves building to 2 to 4 feet.

$$

LSZ264-020400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
353 PM EDT Wed May 1 2024

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Patchy fog.
A chance of rain showers. Waves 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late.
Patchy fog after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east late. Patchy
fog through early afternoon. A chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots increasing to 20 to
30 knots. Rain showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A slight chance of rain
showers through early afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ265-020400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
353 PM EDT Wed May 1 2024

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Patchy fog. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Patchy fog
through early afternoon. Rain showers likely by mid afternoon.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots veering southeast
late. Rain showers and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots. A chance of rain showers
through early afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming northeast
10 to 20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. A chance of rain
showers through midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-020400-
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-
353 PM EDT Wed May 1 2024

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Patchy fog.
Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy fog. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering northeast in
the afternoon, then veering east late. Patchy fog through early
afternoon. A chance of rain showers by mid afternoon. Waves calm
to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming southeast 20 to 30 knots
late. Rain showers. A slight chance of thunderstorms after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 10 to 20 knots. A chance of rain showers and
a slight chance of thunderstorms through early afternoon. Waves
subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ267-020400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
353 PM EDT Wed May 1 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Sprinkles.
Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots veering north in the
afternoon, then veering east late. Patchy fog through early
afternoon. A slight chance of rain showers by mid afternoon.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots late. Rain showers. A slight chance of
thunderstorms after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Rain showers likely and a slight chance of
thunderstorms through early afternoon. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing northeast by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ261-020400-
MAFOR 0121/
Superior West 12610 11710 11700 12100 11110 11120. A chance of
rain showers Thursday afternoon. Waves 1 to 3 feet.

Superior North Central 11710 11610 11620 12710 11800 11100 11210.
Waves 2 to 4 feet subsiding to 1 to 2 feet tonight. Waves 1 foot
or less Thursday.

Superior South Central 11630 11720 13610 11700 11800 11200. A
chance of rain showers Thursday afternoon. Waves 1 to 3 feet
tonight. Waves 1 foot or less Thursday.

Superior East 11610 11620 12720 11710 11700 11800 11100. Waves 1
to 3 feet.

$$

BW

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

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