Great Lakes Forecast
Issued by NWS

Current Version | Previous Version | Text Only | 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
966
FZUS63 KMQT 192000
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EDT Wed Jul 19 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...With a 30.1 inch ridge over the Upper Great Lakes this
afternoon, a trough at 29.8 inches will track into and then
remain in place across the Upper Great Lakes as the ridge builds
over the Ohio Valley late tonight into Friday afternoon. On
Saturday morning a 29.7 inch low over the Central Plains will
track northeast and reach the Upper Mississippi River Valley by
Sunday afternoon. A 29.6 inch low moves across the Upper Great
Lakes Saturday night and Sunday.

LSZ162-200400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Wed Jul 19 2017 /300 PM CDT Wed Jul 19 2017/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering west late. A
chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight, then backing west late. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-200400-
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-
400 PM EDT Wed Jul 19 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then becoming southwest less than 10 knots late.
Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ264-200400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EDT Wed Jul 19 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing southwest late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SUNDAY...North winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ265-200400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Wed Jul 19 2017

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering west in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight, then becoming west 10 to 20 knots late. Waves
calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering west
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots veering south. Waves calm to
2 feet.

$$

LSZ266-200400-
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-
400 PM EDT Wed Jul 19 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering west in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots becoming southwest
10 to 20 knots late. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots backing north after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ267-200400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Wed Jul 19 2017

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

$$

LSZ261-200400-
MAFOR 1921/
Superior West 11400 13310 11500 11600 12510. Chance of showers
late this evening. Waves 2 feet or less.

Superior North Central 11520 14410 12510 11610. Waves 1 to 2
feet.

Superior South Central 11200 12310 12410 11510 11500 11600. Waves
2 feet or less.

Superior East 11500 11400 11300 11310 12410 11510 11600. Waves 1
to 2 feet.

$$

Titus

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.