Great Lakes Forecast
Issued by NWS

Home | 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
000
FZUS63 KMQT 180151
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
951 PM EDT Mon Jul 17 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...High pressure of 30.1 inches over the central and
eastern Great Lakes will shift southeast overnight as a 29.8 inch
trough moves across Lake Superior on Tuesday into Wednesday. The
trough will settle south of Lake Superior on Thursday while a 30.0
inch ridge builds over the Upper Great Lakes. On Friday another
trough at 29.8 inches tracks across the Upper Great Lakes as the
ridge builds over the Ohio Valley. On Saturday morning a 29.6 inch
low over the Mid Mississippi Valley tracks to Southern Lake
Michigan through Saturday as an associated 29.7 inch trough moves
over the Upper Great Lakes.

LSZ162-181000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
951 PM EDT Mon Jul 17 2017 /851 PM CDT Mon Jul 17 2017/

.REST OF TONIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. Numerous showers and scattered thunderstorms. Patchy fog
after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A chance of showers, with a slight chance of
thunderstorms through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-181000-
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-
951 PM EDT Mon Jul 17 2017

.REST OF TONIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Scattered showers and thunderstorms. Patchy fog after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. A chance of showers, with a slight chance of
thunderstorms through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-181000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
951 PM EDT Mon Jul 17 2017

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
late. Scattered showers and thunderstorms. Patchy fog after
midnight. Waves 1 to 3 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. A chance of showers, with a slight chance of
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
late. A slight chance of showers through midnight. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest less
than 10 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-181000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
951 PM EDT Mon Jul 17 2017

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Scattered showers and thunderstorms after Midnight. Waves 1 to 3
feet subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ266-181000-
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-
951 PM EDT Mon Jul 17 2017

.REST OF TONIGHT...South winds 15 to 25 knots. Scattered showers
and thunderstorms after Midnight. Waves 1 to 3 feet building to 2
to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then becoming northwest 5 to 15 knots late. A chance
of showers and a slight chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest late.
A slight chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering northeast. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ267-181000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
951 PM EDT Mon Jul 17 2017

.REST OF TONIGHT...South winds 10 to 20 knots. Isolated showers
and thunderstorms after midnight. Waves calm to 2 feet building
to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots becoming north 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Showers likely and a slight chance of thunderstorms
through midnight, then a chance of showers after midnight. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing
southeast after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$
LSZ261-181000-
MAFOR 1803/
Superior West 12526 11516 12610 13600. Patchy fog late tonight through
mid morning. Scattered showers and thunderstorms late this
evening through mid morning...then chance of showers late Tuesday
morning. Waves 1 to 2 feet.

Superior North Central 11420 12520 12510 11610 12510. Patchy fog
late tonight through mid morning. Scattered showers and
thunderstorms overnight through mid morning...then chance of
showers late Tuesday morning. Waves 1 to 3 feet.


Superior South Central 11430 12420 12410 11300 11800 11600.
Scattered showers and thunderstorms late overnight...a chance of
showers Tuesday and Tuesday evening. Waves 2 to 3 feet overnight.
Waves 2 feet or less Tuesday and Tuesday evening.

Superior East 13420 11520 12510 11700 11600. Chance of showers
Tuesday and Tuesday evening. Waves 1 to 3 feet.

$$

RJT

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.