Great Lakes Forecast
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945
FZUS63 KMQT 181351
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
951 AM EDT TUE APR 18 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 FROM NORTHERN QUEBEC TO THE UPPER
GREAT LAKES WILL MOVE OVER THE EASTERN GREAT LAKES THIS MORNING AS
A 29.5 INCH LOW TRACKS EASTWARD ACROSS MINNESOTA. THE LOW WILL
CROSS LAKE SUPERIOR AT 29.7 INCHES TONIGHT WHILE A 30.4 INCH HIGH
PRESSURE MOVES INTO NORTHERN ONTARIO. THE HIGH WILL MOVE OVER
QUEBEC ON THURSDAY AS A 29.7 INCH LOW PRESSURE MOVES FROM THE
CENTRAL PLAINS TO LOWER MICHIGAN. THE LOW WILL MOVE OFF THE EAST
COAST FRIDAY AFTERNOON AS A 30.4 INCH RIDGE MOVES OVER THE
NORTHERN GREAT LAKES. THE RIDGE WILL LINGER OVER THE NORTHERN
GREAT LAKES THROUGH SATURDAY.

LSZ162-182200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
951 AM EDT TUE APR 18 2017 /851 AM CDT TUE APR 18 2017/

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

$$

LSZ263-182200-
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 AM EDT TUE APR 18 2017

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
20 TO 30 KNOTS BY MID AFTERNOON. RAIN SHOWERS. WAVES 1 TO 3 FEET
BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET...THEN SUBSIDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TONIGHT...NORTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY NIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A SLIGHT
CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.THURSDAY...NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST LESS THAN
10 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.

$$

LSZ264-182200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
951 AM EDT TUE APR 18 2017

...GALE WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 8 PM EDT
THIS EVENING...

.REST OF TODAY...SOUTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS THIS AFTERNOON. A CHANCE OF RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW BY LATE MORNING...THEN RAIN
SHOWERS LIKELY BY MID AFTERNOON. WAVES 2 TO 4 FEET BUILDING TO 7
TO 10 FEET OCCASIONALLY TO 13 FEET...THEN SUBSIDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.TONIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH WINDS 10
TO 20 KNOTS IN THE EVENING THEN BACKING NORTH AFTER MIDNIGHT. A
CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. WAVES SUBSIDING TO 3 TO 5
FEET OCCASIONALLY TO 7 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
15 TO 25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
2 TO 4 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.FRIDAY...NORTH WINDS 5 TO 15 KNOTS BACKING WEST. WAVES SUBSIDING
TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.

$$

LSZ265-182200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
951 AM EDT TUE APR 18 2017

...GALE WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 8 PM EDT
THIS EVENING...

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
GALES TO 35 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS.
WAVES 2 TO 4 FEET BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TONIGHT...SOUTH WINDS 20 TO 30 KNOTS DECREASING TO 10 TO 20
KNOTS BY LATE EVENING AND BECOMING NORTHWEST 15 TO 25 KNOTS AFTER
MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. WAVES
SUBSIDING TO 2 TO 4 FEET...THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET.
.WEDNESDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE
OF SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY...NORTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN AND SNOW SHOWERS
THROUGH EARLY AFTERNOON...THEN RAIN AND SNOW SHOWERS LIKELY BY
MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
.THURSDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN
AND SNOW SHOWERS THROUGH MIDNIGHT. WAVES SUBSIDING TO 1 TO
3 FEET.
.FRIDAY...NORTH WINDS 5 TO 15 KNOTS BACKING WEST. WAVES SUBSIDING
TO CALM TO 2 FEET.
.SATURDAY...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.

$$

LSZ266-182200-
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 AM EDT TUE APR 18 2017

...GALE WARNING IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
THIS EVENING...

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

$$

LSZ267-182200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
951 AM EDT TUE APR 18 2017

...GALE WARNING IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
THIS EVENING...

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

$$
LSZ261-182200-
MAFOR 1815/
SUPERIOR WEST 12246 11120 13710 12810. CHANCE OF RAIN SHOWERS
THROUGH EARLY EVENING TONIGHT. WAVES 2 TO 5 FEET.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11346 12356
11430 11610 11730 12830. CHANCE OF RAIN SHOWERS LATE THIS
MORNING THROUGH LATE THIS EVENING. WAVES 2 TO 4 FEET BUILDING TO
6 TO 9 FEET THIS AFTERNOON. WAVES 7 TO 10 FEET SUBSIDING TO 3 TO 5
FEET TONIGHT AND WEDNESDAY MORNING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...13340 11450
11520 11720 12730. CHANCE OF RAIN SHOWERS THIS AFTERNOON AND
EVENING. WAVES 2 TO 5 FEET.

SUPERIOR EAST...GALE WARNING IN EFFECT...12340 12356 11430 11520
12730. CHANCE OF RAIN SHOWERS LATE THIS AFTERNOON THROUGH LATE
TONIGHT. WAVES 3 TO 8 FEET SUBSIDING TO 2 TO 5 FEET TONIGHT AND
WEDNESDAY MORNING.

$$

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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