Great Lakes Forecast
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FZUS63 KMQT 210148
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 PM EDT Sun May 20 2018

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 high pressure ridge of 30.2 inches will linger over
the Upper Great Lakes through Tuesday as it weakens to 30.1
inches. A weak low pressure trough of 30.0 inches will drop south
across Lake Superior Tuesday night and into Wednesday morning. In
its wake, high pressure of 30.2 inches will build over northern
Ontario Wednesday. The high will shift over the Great Lakes Region
through Thursday as one low pressure trough of 29.7 inches sweeps
south into northern Ontario and a second trough of 29.7 inches
moves over the western Plains by the evening. The western Plains
trough moves into the Upper Great Lakes on Friday evening.

LSZ162-211000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 PM EDT Sun May 20 2018 /848 PM CDT Sun May 20 2018/

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots backing northeast in
the afternoon, then increasing to 5 to 15 knots late. Waves calm
to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots veering west after
midnight, then becoming southwest 5 to 15 knots late. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast. A chance of
showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ263-211000-
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-
948 PM EDT Sun May 20 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 2 to
4 feet subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then veering northeast late. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming southeast
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds less than 10 knots increasing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves building to 2 to 4 feet.

$$

LSZ264-211000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 PM EDT Sun May 20 2018

.REST OF TONIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight, then veering southwest late. Waves
calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A chance of rain showers.
Rain showers likely. Waves building to 2 to 4 feet.

$$

LSZ265-211000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 PM EDT Sun May 20 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of thunderstorms. Showers likely. Waves calm to 2 feet.

$$

LSZ266-211000-
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-
948 PM EDT Sun May 20 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then becoming southwest 5 to
15 knots late. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet.

$$

LSZ267-211000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 PM EDT Sun May 20 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing south
after midnight, then veering southwest late. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots veering north in the
afternoon, then becoming east 5 to 15 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south after
midnight, then veering southwest late. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. A chance of thunderstorms. Rain showers likely. Waves
building to 1 to 3 feet.

$$
LSZ261-211000-
MAFOR 2103/
Superior West 14500 11500 11800 11200 11100. Waves 1 foot or
less.

Superior North Central 11520 12510 13500 11300 11310. Waves 2 to
4 feet overnight. Waves 3 feet or less Monday and Monday evening.

Superior South Central 14500 11300 12210 11310. Waves 2 feet or
less.

Superior East 12510 13500 11700 12200. Waves 2 feet or less.

$$

KCW

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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