Great Lakes Forecast
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240
FZUS63 KMQT 210757
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
357 AM EDT FRI APR 21 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 29.7 INCH LOW OVER GEORGIAN BAY WILL TRACK ACROSS
SOUTHERN QUEBEC THROUGH LATE TONIGHT WHILE A 30.3 INCH RIDGE
MOVES OVER THE NORTHERN GREAT LAKES. THE RIDGE WILL LINGER OVER
THE NORTHERN GREAT LAKES ON SATURDAY. A WEAK 30.0 INCH TROUGH
QUICKLY MOVES SOUTH ACROSS LAKE SUPERIOR SUNDAY MORNING...FOLLOWED
BY A 30.2 INCH RIDGE OVER THE UPPER GREAT LAKES BY SUNDAY
AFTERNOON. THE RIDGE DEPARTS TO THE EAST ON MONDAY AS A 29.4 INCH
LOW PRESSURE SYSTEM DEVELOPS OVER THE NORTHERN PLAINS. THE LOW IS
EXPECTED TO REACH NORTHEAST MINNESOTA AND WESTERN LAKE SUPERIOR
ON TUESDAY MORNING.

LSZ162-211600-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
357 AM EDT FRI APR 21 2017 /257 AM CDT FRI APR 21 2017/

.EARLY THIS MORNING...NORTHWEST WINDS 10 TO 20 KNOTS. WAVES 2 TO
4 FEET.
.TODAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN SHOWERS.
WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW...
THEN RAIN SHOWERS LIKELY. WAVES 2 TO 4 FEET.
.TUESDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. A CHANCE OF
RAIN SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8
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-
357 AM EDT FRI APR 21 2017

.EARLY THIS MORNING...NORTH WINDS 10 TO 20 KNOTS. ISOLATED RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES 3 TO 5 FEET OCCASIONALLY
TO 7 FEET.
.TODAY...NORTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO 15 KNOTS
BY MID AFTERNOON. ISOLATED RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET...THEN
SUBSIDING TO 1 TO 3 FEET.
.SUNDAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES 1 TO
3 FEET.
.SUNDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW
SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES 1 TO 3 FEET.
.MONDAY...EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST. A CHANCE
OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW...THEN RAIN SHOWERS
LIKELY. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. A CHANCE OF
RAIN SHOWERS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.

$$

LSZ264-211600-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
357 AM EDT FRI APR 21 2017

.EARLY THIS MORNING...NORTH WINDS 15 TO 25 KNOTS. SCATTERED RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS BY MID AFTERNOON. ISOLATED RAIN SHOWERS THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN
SHOWERS. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING
TO 2 TO 4 FEET.
.SUNDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. A CHANCE OF
RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN AND
SNOW SHOWERS...THEN RAIN SHOWERS LIKELY. WAVES BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO
20 KNOTS. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.

$$

LSZ265-211600-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
357 AM EDT FRI APR 21 2017

.EARLY THIS MORNING...NORTH WINDS 20 TO 30 KNOTS. SCATTERED RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. SCATTERED RAIN AND SNOW SHOWERS
THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.SUNDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS VEERING NORTHWEST. A CHANCE
OF RAIN SHOWERS. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9
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-
357 AM EDT FRI APR 21 2017

.EARLY THIS MORNING...NORTH WINDS 20 TO 30 KNOTS. SCATTERED RAIN
AND SNOW SHOWERS. WAVES 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. ISOLATED RAIN AND SNOW SHOWERS THROUGH EARLY
AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO
10 FEET...THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE
OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.SUNDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SNOW SHOWERS. A CHANCE OF RAIN SHOWERS.
WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.

$$

LSZ267-211600-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
357 AM EDT FRI APR 21 2017

.EARLY THIS MORNING...NORTH WINDS 15 TO 25 KNOTS. NUMEROUS RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.TODAY...NORTH WINDS 20 TO 30 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. SCATTERED RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
THROUGH EARLY AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET...THEN SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET...THEN
SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SNOW SHOWERS. A CHANCE OF RAIN SHOWERS.
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTHEAST WINDS 15 TO 25 KNOTS VEERING NORTHWEST. A
CHANCE OF RAIN SHOWERS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.

$$

LSZ261-211600-
MAFOR 2109/
SUPERIOR WEST 12710 11610 12510 13500. ISOLATED RAIN SHOWERS THIS
MORNING. WAVES 1 TO 4 FEET.

SUPERIOR NORTH CENTRAL 12830 11720 11710 12620 11610 11600.
SCATTERED RAIN SHOWERS THIS MORNING. WAVES 3 TO 6 FEET SUBSIDING
TO 2 TO 4 FEET TODAY. WAVES 1 TO 3 FEET TONIGHT.

SUPERIOR SOUTH CENTRAL 12840 11830 12720 13710. SCATTERED RAIN
AND SNOW SHOWERS THIS MORNING. WAVES 5 TO 8 FEET SUBSIDING TO 3
TO 5 FEET TODAY. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
TONIGHT.

SUPERIOR EAST 11830 11840 11830 11730 12720 11820 11810.
SCATTERED RAIN AND SNOW SHOWERS THROUGH MID MORNING. WAVES 3 TO 6
FEET BUILDING TO 4 TO 7 FEET TODAY. WAVES 3 TO 5 FEET SUBSIDING
TO 2 TO 3 FEET TONIGHT.

$$

JLA

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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