Great Lakes Forecast
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483
FZUS63 KMQT 291403
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1003 AM EDT SAT APR 29 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 30.4 INCH RIDGE WILL BUILD OVER THE UPPER GREAT
LAKES TODAY. THIS RIDGE WILL MOVE OVER EASTERN ONTARIO AND WESTERN
QUEBEC ON SUNDAY AND STRENGTHEN TO 30.5 INCHES...WHILE A 29.4
INCH LOW DEVELOPS IN THE CENTRAL PLAINS. ON MONDAY...THIS LOW
WILL DEEPEN TO 29.2 INCHES AS IT LIFTS NORTHEAST ACROSS WISCONSIN
AND UP INTO CENTRAL PORTIONS OF UPPER MICHIGAN. THE LOW WILL
WEAKEN TO AROUND 29.4 INCHES AS IT LIFTS NORTHEAST INTO QUEBEC ON
TUESDAY...LEAVING A TROUGH OF 29.9 INCHES DRAPED ACROSS THE UPPER
GREAT LAKES. THE PRESSURE GRADIENT WILL THEN RELAX ACROSS THE
UPPER GREAT LAKES AS A WEAK HIGH PRESSURE OF 30.1 INCHES LINGERS
WEDNESDAY AND THURSDAY...WHILE A LOW OF 29.6 INCHES LIFTS ACROSS
THE OHIO RIVER VALLEY.

LSZ162-292215-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1003 AM EDT SAT APR 29 2017 /903 AM CDT SAT APR 29 2017/

...GALE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
EVENING...

.REST OF TODAY...NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS
THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. RAIN SHOWERS LIKELY
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET...THEN BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET...THEN SUBSIDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS. RAIN SHOWERS...
POSSIBLY MIXED WITH SNOW SHOWERS THROUGH MIDNIGHT...THEN A CHANCE
OF RAIN AND SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 5 TO
15 KNOTS. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW.
WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES
CALM TO 2 FEET.

$$

LSZ263-292215-
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-
1003 AM EDT SAT APR 29 2017

...GALE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
EVENING...

.REST OF TODAY...NORTH WINDS LESS THAN 10 KNOTS INCREASING TO
5 TO 15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
.SUNDAY...NORTHEAST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF RAIN
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 40 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...
POSSIBLY MIXED WITH SNOW THROUGH MIDNIGHT...THEN RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO
9 FEET...THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET...THEN SUBSIDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS. RAIN SHOWERS AND SNOW
SHOWERS LIKELY. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.WEDNESDAY...SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ264-292215-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1003 AM EDT SAT APR 29 2017

...GALE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
EVENING...

.REST OF TODAY...NORTH WINDS 5 TO 15 KNOTS. WAVES 1 TO 3 FEET
SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO
3 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
GALES TO 35 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS
THROUGH MIDNIGHT...THEN RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET.
.MONDAY...NORTHEAST GALES TO 35 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 6 TO 10 FEET
OCCASIONALLY TO 13 FEET.
.MONDAY NIGHT...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS THROUGH
MIDNIGHT. RAIN SHOWERS. SNOW SHOWERS LIKELY AFTER MIDNIGHT. WAVES
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO
2 FEET.
.WEDNESDAY...SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST. WAVES
CALM TO 2 FEET.

$$

LSZ265-292215-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1003 AM EDT SAT APR 29 2017

.REST OF TODAY...NORTH WINDS 5 TO 15 KNOTS. WAVES 1 TO 3 FEET
SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID AFTERNOON.
WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW THROUGH MIDNIGHT...THEN RAIN SHOWERS AFTER
MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET.
.MONDAY...EAST GALES TO 35 KNOTS DIMINISHING TO 15 TO 25 KNOTS BY
MID AFTERNOON. RAIN SHOWERS. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET...THEN SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET...THEN
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.WEDNESDAY...EAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ266-292215-
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-
1003 AM EDT SAT APR 29 2017

.REST OF TODAY...NORTH WINDS 10 TO 20 KNOTS. WAVES 2 TO 4 FEET
SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO
3 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...
POSSIBLY MIXED WITH SNOW THROUGH MIDNIGHT...THEN RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO
9 FEET.
.MONDAY...EAST GALES TO 35 KNOTS. RAIN SHOWERS. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET...THEN SUBSIDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET.
.MONDAY NIGHT...EAST WINDS 20 TO 30 KNOTS BACKING NORTH AFTER
MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. A CHANCE OF SNOW SHOWERS. A CHANCE OF RAIN SHOWERS.
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET...THEN
SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ267-292215-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1003 AM EDT SAT APR 29 2017

.REST OF TODAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST BY
MID AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID AFTERNOON.
WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT...THEN RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS BECOMING SOUTHEAST 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS. WAVES BUILDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT...THEN RAIN SHOWERS LIKELY...POSSIBLY MIXED WITH SNOW
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW SHOWERS.
A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ261-292215-
MAFOR 2915/
SUPERIOR WEST 11800 11100 11200 11210 12110 12120. WAVES 2 TO 4
FEET.

SUPERIOR NORTH CENTRAL 11810 12700 11800 11110 11210 12220. WAVES
1 TO 4 FEET.

SUPERIOR SOUTH CENTRAL 14810 11110 11120 12220. WAVES 1 TO 4 FEET.

SUPERIOR EAST 11810 12710 11810 11120 13220. WAVES 2 TO 3 FEET.

$$

JSS

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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