Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FZUS63 KMQT 210755
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 AM EDT Mon May 21 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 extending
across the Upper Great Lakes will linger through Tuesday as it
weakens. A weak low pressure trough of 30.0 inches will then drop
south across Lake Superior late Tuesday night and Wednesday
morning. In its wake, high pressure of 30.2 inches will build over
northern Ontario Wednesday. The high will then shift over the
Great Lakes region through Thursday as one low pressure trough of
29.7 inches drops south into northern Ontario and a second trough
of 29.7 inches moves over the western Plains. The western Plains
trough will reach the Upper Mississippi Valley late Friday.

LSZ162-211600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 AM EDT Mon May 21 2018 /255 AM CDT Mon May 21 2018/

.EARLY THIS MORNING...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...South winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds less than 10 knots backing west after
midnight, then backing southwest late. Waves calm to 2 feet.
.TUESDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon. 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...Southwest winds less than 10 knots backing southeast
by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds less than 10 knots backing
northeast after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 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.

$$

LSZ263-211600-
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-
355 AM EDT Mon May 21 2018

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

$$

LSZ264-211600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 AM EDT Mon May 21 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 5 to
15 knots after midnight, then veering southwest late. Waves
building to 1 to 3 feet, then subsiding to 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...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of thunderstorms. Showers likely. Waves calm to 2 feet.

$$

LSZ265-211600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 AM EDT Mon May 21 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon,
then increasing to 10 to 20 knots late. Waves building to 1 to
3 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 5 to
15 knots after midnight, then veering southwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. 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 veering south. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-211600-
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-
355 AM EDT Mon May 21 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...South winds 5 to 15 knots backing east late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-211600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 AM EDT Mon May 21 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then veering southwest late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering west in the
afternoon, then veering northwest late. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ261-211600-
MAFOR 2109/
Superior West 12400 11300 11200 12100 12600. Waves 1 foot or
less.

Superior North Central 11510 11500 11400 13310 12410. Waves 1 to
3 feet.

Superior South Central 11500 11400 11300 11310 12320 12410. Waves
1 to 3 feet.

Superior East 11500 12400 11300 12200 11300 11400. Waves 2 feet
or less.

$$

Rolfson

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

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


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.