Great Lakes Forecast
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000
FZUS63 KMQT 210119
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
919 PM EDT Tue Jun 20 2017

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...Low pressure of 29.5 inches across Northern Quebec
will remain nearly stationary through Wednesday morning. A 29.9
inch ridge over the Upper Mississippi Valley will drift to the
Upper Great Lakes through Wednesday. The ridge will shift over the
Lower Great Lakes on Thursday as a 29.4 inch low develops near
Lake Winnipeg. This low will push a series of weak troughs across
Lake Superior Wednesday night through Saturday as it drifts
eastward to central Quebec. A 30.2 ridge will build across the
central Plains on Sunday as a 29.8 inch low forms over northern
Ontario.

LSZ162-210930-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
919 PM EDT Tue Jun 20 2017 /819 PM CDT Tue Jun 20 2017/

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds less than 10 knots backing south in
the afternoon, then becoming east 5 to 15 knots late. A chance of
rain showers by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering southwest
late. A chance of showers. A slight chance of thunderstorms after
midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing northwest. A
chance of rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ263-210930-
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-
919 PM EDT Tue Jun 20 2017

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming south less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
A slight chance of rain showers by mid afternoon. Waves calm to
2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering south late. A
chance of showers through midnight, then showers likely and a
slight chance of thunderstorms after midnight. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ264-210930-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
919 PM EDT Tue Jun 20 2017

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet subsiding to calm to 2
feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest less
than 10 knots in the afternoon, then becoming south 5 to 15 knots
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
late. A slight chance of rain showers through midnight, then rain
showers likely and a slight chance of thunderstorms after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Patchy fog through early afternoon. A slight chance of
showers and thunderstorms through early afternoon. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-210930-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
919 PM EDT Tue Jun 20 2017

.REST OF TONIGHT...Northwest winds 10 to 20 knots becoming west 5
to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing east in the
afternoon, then veering southeast late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers through midnight, then
showers likely and a slight chance of thunderstorms after
midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots. Patchy fog through early
afternoon. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...North winds 10 to 20 knots backing west. Waves calm
to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ266-210930-
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-
919 PM EDT Tue Jun 20 2017

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Patchy fog. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming west less
than 10 knots in the afternoon, then becoming east 5 to 15 knots
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of rain showers through midnight,
then rain showers likely after midnight. Waves building to 2 to
4 feet.
.THURSDAY...South winds 10 to 20 knots veering west by mid
afternoon. A chance of rain showers and a slight chance of
thunderstorms through early afternoon. Patchy fog. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Patchy fog. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots. Patchy fog through early
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ267-210930-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
919 PM EDT Tue Jun 20 2017

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Patchy fog. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots veering north late.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers after
midnight. Waves building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Patchy fog. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Patchy fog. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots. Patchy fog. Waves calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$
LSZ261-210930-
MAFOR 2103/
Superior West 11610 13600 11500 11400 11200 11210. Chance of
showers Wednesday evening. Waves 2 feet or less.

Superior North Central 13610 11600 12500 11300 11310. Waves 1 to
3 feet.

Superior South Central 13610 11600 11800 11200 12310. Waves 2
feet or less.

Superior East 11610 11600 13600 11500 11400 11300. Patchy fog
through mid morning Wednesday. Waves 1 to 3 feet.

$$

Kluber

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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