Great Lakes Forecast
Issued by NWS

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387
FZUS63 KMQT 201400
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1000 AM EDT THU APR 20 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 SOUTHERN WISCONSIN WILL REACH
NORTHERN LAKE MICHIGAN LATE THIS AFTERNOON. THE LOW WILL TRACK
ACROSS SOUTHERN QUEBEC FRIDAY EVENING WHILE A 30.3 INCH RIDGE
MOVES OVER THE NORTHERN GREAT LAKES. A RIDGE WILL LINGER OVER THE
NORTHERN GREAT LAKES THROUGH 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 LIFTS NORTHEAST ACROSS THE NORTHERN PLAINS.
THE LOW IS EXPECTED TO REACH THE UPPER GREAT LAKES ON TUESDAY
MORNING.

LSZ162-202200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1000 AM EDT THU APR 20 2017 /900 AM CDT THU APR 20 2017/

...GALE WARNING IN EFFECT UNTIL 5 PM EDT /4 PM CDT/ THIS
AFTERNOON...

.REST OF TODAY...NORTHEAST GALES TO 40 KNOTS. RAIN. WAVES 6 TO 10
FEET OCCASIONALLY TO 13 FEET.
.TONIGHT...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW THROUGH MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
.FRIDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...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. WAVES BUILDING TO 1 TO 3 FEET...THEN
SUBSIDING TO CALM TO 2 FEET.
.SATURDAY NIGHT...WEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS.
WAVES BUILDING TO 1 TO 3 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS...THEN RAIN SHOWERS
LIKELY. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO
3 FEET.

$$

LSZ263-202200-
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-
1000 AM EDT THU APR 20 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...NORTHEAST GALES TO 35 KNOTS. RAIN. WAVES 5 TO 8
FEET OCCASIONALLY TO 10 FEET BUILDING TO 7 TO 10 FEET OCCASIONALLY
TO 13 FEET...THEN SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11
FEET.
.TONIGHT...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. SNOW SHOWERS LIKELY THROUGH MIDNIGHT. A
CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO 15 KNOTS
BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
.SATURDAY NIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST. A CHANCE OF
SNOW SHOWERS. WAVES SUBSIDING TO CALM TO 2 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.

$$

LSZ264-202200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1000 AM EDT THU APR 20 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...EAST GALES TO 35 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. RAIN. WAVES 4 TO 7 FEET OCCASIONALLY TO 9 FEET
BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH AFTER
MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS THROUGH MIDNIGHT...THEN A
CHANCE OF RAIN AND SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.FRIDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN
10 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW
SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 2 TO
4 FEET.
.SUNDAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW
SHOWERS...POSSIBLY MIXED WITH RAIN...THEN RAIN SHOWERS. WAVES
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.

$$

LSZ265-202200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1000 AM EDT THU APR 20 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...EAST GALES TO 40 KNOTS BECOMING NORTHEAST GALES
TO 35 KNOTS BY MID AFTERNOON. RAIN. WAVES 5 TO 8 FEET
OCCASIONALLY TO 10 FEET BUILDING TO 7 TO 10 FEET OCCASIONALLY TO
13 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH AFTER
MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF SNOW SHOWERS...POSSIBLY MIXED WITH
RAIN AFTER MIDNIGHT. WAVES SUBSIDING TO 5 TO 8 FEET OCCASIONALLY
TO 10 FEET.
.FRIDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS
THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...WEST 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 2 TO 4 FEET.
.SUNDAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS. RAIN SHOWERS LIKELY.
WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.

$$

LSZ266-202200-
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-
1000 AM EDT THU APR 20 2017

...GALE WARNING IN EFFECT UNTIL 6 PM EDT THIS EVENING...

.REST OF TODAY...EAST GALES TO 40 KNOTS. RAIN. WAVES 5 TO 8 FEET
OCCASIONALLY TO 10 FEET BUILDING TO 7 TO 10 FEET OCCASIONALLY TO
13 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH AFTER
MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN AND SNOW SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
.FRIDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS
THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.FRIDAY NIGHT...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 BACKING SOUTH BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT.
WAVES BUILDING TO 2 TO 4 FEET.
.SUNDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO 15 KNOTS.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.

$$

LSZ267-202200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1000 AM EDT THU APR 20 2017

...GALE WARNING IN EFFECT UNTIL 6 PM EDT THIS EVENING...

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

$$
LSZ261-202200-
MAFOR 2015/
SUPERIOR WEST...GALE WARNING IN EFFECT...11156 12146 12830 11820
11720 11710. CHANCE OF RAIN SHOWERS AND AFTER MIDNIGHT TONIGHT.
WAVES 6 TO 10 FEET THIS AFTERNOON. WAVES 5 TO 9 FEET SUBSIDING TO
3 TO 6 FEET TONIGHT. WAVES 2 TO 4 FEET FRIDAY MORNING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11156 14146
12840 11830. CHANCE OF RAIN AND SNOW SHOWERS LATE TONIGHT. WAVES 5
TO 8 FEET BUILDING TO 7 TO 10 FEET THIS AFTERNOON. WAVES 6 TO 10
FEET SUBSIDING TO 5 TO 8 FEET TONIGHT. WAVES 4 TO 7 FEET SUBSIDING
TO 3 TO 6 FEET FRIDAY MORNING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11256 11246
13146 13840. CHANCE OF RAIN SHOWERS LATE TONIGHT. CHANCE OF SNOW
SHOWERS THROUGH MID MORNING FRIDAY MORNING. WAVES 6 TO 10 FEET
THIS AFTERNOON AND TONIGHT. WAVES 5 TO 8 FEET FRIDAY MORNING.


SUPERIOR EAST...GALE WARNING IN EFFECT...11256 13146 12146 11140
12840. CHANCE OF RAIN SHOWERS AFTER MIDNIGHT THROUGH MID MORNING
FRIDAY MORNING. WAVES 5 TO 8 FEET BUILDING TO 6 TO 9 FEET THIS
AFTERNOON. WAVES 5 TO 9 FEET TONIGHT AND FRIDAY MORNING.


$$

PETRO

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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