Great Lakes Forecast
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000
FZUS63 KMQT 250758
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
358 AM EDT TUE APR 25 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...A 29.5 INCH LOW PRESSURE TROUGH OVER THE UPPER
MISSISSIPPI RIVER VALLEY THIS MORNING WILL REMAIN STATIONARY
THROUGH TONIGHT AS 30.5 INCH HIGH PRESSURE REMAINS OVER HUDSON
BAY. A 29.4 INCH LOW WILL ORGANIZE ALONG THIS TROUGH OVER
CENTRAL WISCONSIN WEDNESDAY MORNING...THEN LIFT NORTHWARD ACROSS
UPPER MICHIGAN THURSDAY MORNING WHILE DEEPENING TO 29.3 INCHES.
THIS LOW WILL HEAD NORTH INTO JAMES BAY BY FRIDAY MORNING AND
FURTHER DEEPEN TO 29.2 INCHES. A 30.0 INCH RIDGE WILL BUILD OVER
THE UPPER GREAT LAKES ON FRIDAY. THE RIDGE WILL BUILD TO 30.3
INCHES OVER THE UPPER GREAT LAKES ON SATURDAY.

LSZ162-251600-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
358 AM EDT TUE APR 25 2017 /258 AM CDT TUE APR 25 2017/

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY
EVENING...

.EARLY THIS MORNING...NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT
CHANCE OF RAIN. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TODAY...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN. WAVES
SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTHEAST GALES TO 40 KNOTS. RAIN. A SLIGHT CHANCE OF
FREEZING RAIN AFTER MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET.
.WEDNESDAY...NORTHEAST GALES TO 40 KNOTS. A SLIGHT CHANCE OF
SLEET THROUGH EARLY AFTERNOON. RAIN...POSSIBLY MIXED WITH
FREEZING RAIN. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO
18 FEET...THEN SUBSIDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.WEDNESDAY NIGHT...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. FREEZING RAIN...POSSIBLY MIXED
WITH RAIN AND SNOW THROUGH MIDNIGHT...THEN SNOW LIKELY...POSSIBLY
MIXED WITH FREEZING RAIN AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. A CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO 1 TO
3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN.
WAVES BUILDING TO 2 TO 4 FEET.

$$

LSZ263-251600-
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-
358 AM EDT TUE APR 25 2017

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH LATE
WEDNESDAY NIGHT...

.EARLY THIS MORNING...SOUTHEAST WINDS 15 TO 25 KNOTS. A SLIGHT
CHANCE OF RAIN. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TODAY...EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET...THEN
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTHEAST GALES TO 40 KNOTS. A SLIGHT CHANCE OF
FREEZING RAIN THROUGH MIDNIGHT. RAIN LIKELY. FREEZING RAIN AFTER
MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
.WEDNESDAY...NORTHEAST GALES TO 40 KNOTS. RAIN...POSSIBLY MIXED
WITH FREEZING RAIN THROUGH EARLY AFTERNOON. A CHANCE OF SLEET. A
CHANCE OF RAIN AND FREEZING RAIN BY MID AFTERNOON. WAVES BUILDING
TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET...THEN SUBSIDING TO 9 TO
12 FEET OCCASIONALLY TO 15 FEET.
.WEDNESDAY NIGHT...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH
20 TO 30 KNOTS AFTER MIDNIGHT. FREEZING RAIN...POSSIBLY MIXED
WITH RAIN...SNOW AND SLEET. WAVES SUBSIDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. RAIN LIKELY THROUGH EARLY AFTERNOON. A
CHANCE OF SNOW. A CHANCE OF RAIN BY MID AFTERNOON. WAVES
SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO 15 KNOTS.
WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.

$$

LSZ264-251600-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
358 AM EDT TUE APR 25 2017

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH LATE
WEDNESDAY NIGHT...

.EARLY THIS MORNING...SOUTHEAST WINDS 15 TO 25 KNOTS. A SLIGHT
CHANCE OF RAIN. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS BACKING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TONIGHT...NORTHEAST GALES TO 40 KNOTS. A CHANCE OF RAIN THROUGH
MIDNIGHT...THEN RAIN...POSSIBLY MIXED WITH FREEZING RAIN AFTER
MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
.WEDNESDAY...NORTHEAST GALES TO 40 KNOTS. FREEZING RAIN THROUGH
EARLY AFTERNOON. RAIN. A SLIGHT CHANCE OF FREEZING RAIN AND SLEET
BY MID AFTERNOON. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO
18 FEET...THEN SUBSIDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.WEDNESDAY NIGHT...NORTHEAST GALES TO 35 KNOTS. RAIN AND FREEZING
RAIN LIKELY...POSSIBLY MIXED WITH SLEET. WAVES SUBSIDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. RAIN LIKELY THROUGH EARLY AFTERNOON...
THEN A CHANCE OF RAIN...POSSIBLY MIXED WITH SNOW BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 2 TO
4 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 2 TO 4 FEET.

$$

LSZ265-251600-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
358 AM EDT TUE APR 25 2017

.EARLY THIS MORNING...SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES 3 TO
5 FEET OCCASIONALLY TO 7 FEET SUBSIDING TO 2 TO 4 FEET.
.TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.TONIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH
MIDNIGHT...THEN RAIN AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO
3 FEET...THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. RAIN. WAVES BUILDING
TO 6 TO 10 FEET OCCASIONALLY TO 13 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS AFTER MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO
3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST BY MID
AFTERNOON. RAIN LIKELY THROUGH EARLY AFTERNOON...THEN A CHANCE OF
RAIN BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. A
CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 2 TO 4 FEET.

$$

LSZ266-251600-
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-
358 AM EDT TUE APR 25 2017

.EARLY THIS MORNING...SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
.TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.TONIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING EAST AFTER
MIDNIGHT. A FEW GALE FORCE GUSTS TO 35 KNOTS AFTER MIDNIGHT. A
CHANCE OF RAIN THROUGH MIDNIGHT...THEN RAIN AFTER MIDNIGHT. WAVES
SUBSIDING TO 2 TO 4 FEET...THEN BUILDING TO 6 TO 9 FEET OCCASIONALLY
TO 11 FEET.
.WEDNESDAY...EAST WINDS 20 TO 30 KNOTS WITH A FEW GALE FORCE GUSTS
TO 35 KNOTS. RAIN. WAVES BUILDING TO 8 TO 12 FEET OCCASIONALLY TO
15 FEET.
.WEDNESDAY NIGHT...EAST WINDS 20 TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS THROUGH MIDNIGHT...THEN WINDS BECOMING NORTHEAST
20 TO 30 KNOTS AFTER MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO 3
TO 5 FEET OCCASIONALLY TO 7 FEET.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST BY MID
AFTERNOON. RAIN LIKELY THROUGH EARLY AFTERNOON...THEN A CHANCE OF
RAIN BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH
SNOW. WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO 1 TO 3 FEET.
.SATURDAY...NORTH WINDS 15 TO 25 KNOTS VEERING NORTHEAST. A
CHANCE OF RAIN AND SNOW. WAVES BUILDING TO 2 TO 4 FEET...THEN
SUBSIDING TO 1 TO 3 FEET.

$$

LSZ267-251600-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
358 AM EDT TUE APR 25 2017

.EARLY THIS MORNING...SOUTHEAST WINDS 20 TO 30 KNOTS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
.TODAY...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TONIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS BACKING EAST AFTER
MIDNIGHT. A CHANCE OF RAIN THROUGH MIDNIGHT...THEN RAIN LIKELY
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY...EAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN LIKELY. WAVES BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET...THEN SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF THUNDERSTORMS
THROUGH MIDNIGHT. RAIN. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN THROUGH EARLY
AFTERNOON...THEN RAIN LIKELY BY MID AFTERNOON. WAVES SUBSIDING TO
CALM TO 2 FEET.
.THURSDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF
RAIN SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 1 TO
3 FEET.
.FRIDAY...SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO CALM
TO 2 FEET.
.SATURDAY...NORTH WINDS 15 TO 25 KNOTS VEERING NORTHEAST. A
CHANCE OF RAIN AND SNOW. WAVES BUILDING TO 2 TO 4 FEET...THEN
SUBSIDING TO 1 TO 3 FEET.

$$

LSZ261-251600-
MAFOR 2509/
SUPERIOR WEST...GALE WARNING IN EFFECT...11330 12210 11130 12150
12156. A CHANCE OF RAIN LATE THIS EVENING. WAVES 3 TO 5 FEET
SUBSIDING TO 2 TO 4 FEET TODAY. WAVES 3 TO 6 FEET BUILDING TO 5
TO 9 FEET TONIGHT.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...13330 11320
11220 11140 11150 11156. A CHANCE OF RAIN TONIGHT. WAVES 3 TO 6
FEET TODAY. WAVES 3 TO 5 FEET BUILDING TO 6 TO 9 FEET TONIGHT.

SUPERIOR SOUTH CENTRAL 14330 11330 12320 11226. A CHANCE OF RAIN
AFTER MIDNIGHT TONIGHT. WAVES 3 TO 5 FEET TODAY. WAVES 2 TO 4
FEET TONIGHT.

SUPERIOR EAST 12340 11330 13340 11330 11236. A CHANCE OF RAIN
AFTER MIDNIGHT TONIGHT. WAVES 3 TO 6 FEET TODAY. WAVES 3 TO 5 FEET
SUBSIDING TO 2 TO 3 FEET TONIGHT.

$$

07

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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