Great Lakes Forecast
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FZUS63 KMQT 231355
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
955 AM EDT SUN APR 23 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 30.0 INCH TROUGH OVER EASTERN LAKE SUPERIOR THIS
MORNING WILL MOVE SOUTHWARD TODAY ON THE SOUTHERN FLANK OF A 30.4
INCH RIDGE BUILDING OVER NORTHERN ONTARIO THAT REMAINS THROUGH
THURSDAY. AS THIS RIDGE DRIFTS TO QUEBEC ON MONDAY...A 29.5 INCH
LOW PRESSURE WILL ORGANIZE OVER THE CENTRAL PLAINS AND WILL PUSH A
29.7 INCH TROUGH ACROSS THE UPPER GREAT LAKES ON TUESDAY AND
TUESDAY NIGHT. A 29.4 INCH LOW PRESSURE SYSTEM WILL ORGANIZE
WEDNESDAY MORNING OVER SOUTHWEST WISCONSIN AND DEEPEN TO 29.2
INCHES OVER LAKE MICHIGAN THURSDAY MORNING BEFORE MOVING NORTH TO
LAKE SUPERIOR THURSDAY AFTERNOON.

LSZ162-232200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
955 AM EDT SUN APR 23 2017 /855 AM CDT SUN APR 23 2017/

.REST OF TODAY...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN AND
SNOW. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF SNOW
THROUGH EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 5 TO
8 FEET OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO 2 TO
4 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS. RAIN LIKELY.
FREEZING RAIN AND SNOW LIKELY...POSSIBLY MIXED WITH SLEET AFTER
MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. A CHANCE OF SNOW. A CHANCE OF RAIN. WAVES BUILDING TO
7 TO 11 FEET OCCASIONALLY TO 14 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO 1 TO
3 FEET.

$$

LSZ263-232200-
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-
955 AM EDT SUN APR 23 2017

.REST OF TODAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
5 TO 15 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED
WITH RAIN. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET SUBSIDING TO
1 TO 3 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO 25 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES BUILDING TO 2 TO 4 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF FREEZING RAIN THROUGH MIDNIGHT. RAIN
LIKELY. FREEZING RAIN LIKELY AFTER MIDNIGHT. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. SNOW...POSSIBLY
MIXED WITH FREEZING RAIN AND SLEET LIKELY...THEN A CHANCE OF
SNOW...POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN. WAVES
SUBSIDING TO 1 TO 3 FEET.

$$

LSZ264-232200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
955 AM EDT SUN APR 23 2017

.REST OF TODAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW INTO EARLY
AFTERNOON. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW. A CHANCE OF RAIN AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH
MIDNIGHT...THEN RAIN LIKELY AFTER MIDNIGHT. WAVES SUBSIDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
2 TO 4 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. RAIN AND FREEZING RAIN LIKELY. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST GALES TO 35 KNOTS. SNOW...POSSIBLY MIXED
WITH FREEZING RAIN AND SLEET LIKELY...THEN A CHANCE OF SNOW.
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN. WAVES
SUBSIDING TO 2 TO 4 FEET.

$$

LSZ265-232200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
955 AM EDT SUN APR 23 2017

.REST OF TODAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW INTO EARLY AFTERNOON.
WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET SUBSIDING TO 1 TO 3
FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SNOW.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF RAIN AND
SNOW THROUGH EARLY AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN.
WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
20 TO 30 KNOTS AFTER MIDNIGHT. RAIN. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. SLEET LIKELY. SNOW...
POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 9 TO 12 FEET
OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST. RAIN
AND SNOW LIKELY...THEN A CHANCE OF RAIN. WAVES SUBSIDING TO 2 TO
4 FEET.

$$

LSZ266-232200-
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-
955 AM EDT SUN APR 23 2017

.REST OF TODAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW INTO EARLY
AFTERNOON. WAVES 4 TO 7 FEET OCCASIONALLY TO 9 FEET SUBSIDING TO
1 TO 3 FEET.
.TONIGHT...NORTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO 20 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. A CHANCE OF RAIN...POSSIBLY MIXED WITH SNOW
THROUGH EARLY AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN. WAVES SUBSIDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING
NORTHEAST 20 TO 30 KNOTS AFTER MIDNIGHT. RAIN. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST GALES TO 35 KNOTS. FREEZING RAIN AND SLEET
LIKELY. RAIN AND SNOW LIKELY. WAVES BUILDING TO 9 TO 12 FEET
OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST
15 TO 25 KNOTS. A CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO 2
TO 4 FEET.

$$

LSZ267-232200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
955 AM EDT SUN APR 23 2017

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

$$
LSZ261-232200-
MAFOR 2315/
SUPERIOR WEST 12220 11210 12220 11230 12240. CHANCE OF RAIN AND
SNOW...THEN A CHANCE OF SNOW LATE TONIGHT. WAVES 2 TO 6 FEET.

SUPERIOR NORTH CENTRAL 11820 11810 11100 12300 11200 11320 11230.
CHANCE OF SNOW AND RAIN THROUGH LATE MONDAY MORNING. WAVES 1 TO 4
FEET.

SUPERIOR SOUTH CENTRAL 11830 12810 11100 12200 11310 11220.
CHANCE OF SNOW INTO EARLY AFTERNOON. WAVES 1 TO 6 FEET.

SUPERIOR EAST 11830 11820 12710 11800 11110 11220 11230. CHANCE
OF SNOW INTO EARLY AFTERNOON AND TONIGHT THROUGH LATE MONDAY
MORNING. WAVES 1 TO 6 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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