Great Lakes Forecast
Issued by NWS

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675
FZUS63 KMQT 260812
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
412 AM EDT WED APR 26 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 29.5 INCH LOW PRESSURE SYSTEM OVER WISCONSIN WILL
LIFT TO EASTERN LAKE SUPERIOR BY THIS EVENING AS ANOTHER LOW
PRESSURE SYSTEM OF 29.3 INCHES ORGANIZES OVER THE MIDDLE
MISSISSIPI RIVER VALLEY. THIS LOW WILL LIFT NORTHWARD ACROSS
UPPER MICHIGAN AND LAKE SUPERIOR ON THURSDAY WHILE DEEPENING TO
29.3 INCHES. THIS LOW WILL HEAD NORTH TO JAMES BAY BY FRIDAY
MORNING. A 30.0 INCH RIDGE WILL BUILD OVER THE UPPER GREAT LAKES
ON FRIDAY. THE RIDGE WILL BUILD TO 30.3 INCHES OVER THE UPPER
GREAT LAKES ON SATURDAY.

LSZ162-261615-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
412 AM EDT WED APR 26 2017 /312 AM CDT WED APR 26 2017/

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS...
POSSIBLY MIXED WITH FREEZING RAIN. WAVES 8 TO 11 FEET
OCCASIONALLY TO 14 FEET BUILDING TO 10 TO 14 FEET OCCASIONALLY TO
18 FEET.
.TODAY...NORTHEAST GALES TO 45 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH FREEZING RAIN. A SLIGHT CHANCE OF SLEET BY MID
AFTERNOON. WAVES BUILDING TO 12 TO 17 FEET OCCASIONALLY TO
21 FEET...THEN SUBSIDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF FREEZING RAIN. A SLIGHT
CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. RAIN...FREEZING RAIN...SLEET AND SNOW IN THE MORNING.
A CHANCE OF RAIN AND SNOW SHOWERS IN THE AFTERNOON. WAVES SUBSIDING
TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN AND
SNOW SHOWERS. WAVES 1 TO 3 FEET.
.FRIDAY...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW SHOWERS.
WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF RAIN SHOWERS...THEN RAIN AND SNOW SHOWERS
LIKELY. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.

$$

LSZ263-261615-
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-
412 AM EDT WED APR 26 2017

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS...
POSSIBLY MIXED WITH FREEZING RAIN. WAVES 8 TO 11 FEET
OCCASIONALLY TO 14 FEET BUILDING TO 10 TO 14 FEET OCCASIONALLY TO
18 FEET.
.TODAY...NORTHEAST GALES TO 45 KNOTS. RAIN...FREEZING RAIN AND
SLEET. WAVES BUILDING TO 12 TO 17 FEET OCCASIONALLY TO 21
FEET...THEN SUBSIDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.
.TONIGHT...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN...FREEZING RAIN...SLEET AND SNOW.
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS BY MID AFTERNOON. RAIN...FREEZING RAIN...SLEET AND SNOW
IN THE MORNING. A CHANCE OF RAIN AND SNOW SHOWERS IN THE AFTERNOON.
WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES
1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS. A
CHANCE OF RAIN SHOWERS BY MID AFTERNOON. WAVES SUBSIDING TO CALM
TO 2 FEET.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.SATURDAY...NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES
BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS. A CHANCE OF RAIN SHOWERS...THEN RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO
11 FEET.

$$

LSZ264-261615-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
412 AM EDT WED APR 26 2017

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. FREEZING
RAIN...POSSIBLY MIXED WITH RAIN SHOWERS. WAVES 9 TO 12 FEET
OCCASIONALLY TO 15 FEET.
.TODAY...NORTHEAST GALES TO 45 KNOTS. RAIN AND FREEZING RAIN
THROUGH EARLY AFTERNOON...THEN RAIN SHOWERS WITH A SLIGHT CHANCE
OF FREEZING RAIN. WAVES BUILDING TO 12 TO 17 FEET OCCASIONALLY TO
21 FEET...THEN SUBSIDING TO 10 TO 14 FEET OCCASIONALLY TO 18
FEET.
.TONIGHT...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH 20 TO
30 KNOTS AFTER MIDNIGHT. RAIN AND FREEZING RAIN LIKELY. WAVES
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. RAIN...FREEZING RAIN...SLEET AND SNOW IN THE MORNING.
A CHANCE OF RAIN AND SNOW SHOWERS IN THE AFTERNOON. WAVES SUBSIDING
TO 2 TO 4 FEET.
.THURSDAY NIGHT...WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES
SUBSIDING TO 1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
BY MID AFTERNOON. A CHANCE OF SNOW SHOWERS. A CHANCE OF RAIN
SHOWERS BY MID AFTERNOON. WAVES 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 5 TO 15 KNOTS VEERING EAST. WAVES
BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.

$$

LSZ265-261615-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
412 AM EDT WED APR 26 2017

.EARLY THIS MORNING...NORTHEAST WINDS 20 TO 30 KNOTS. RAIN SHOWERS.
WAVES 4 TO 8 FEET OCCASIONALLY TO 10 FEET.
.TODAY...NORTHEAST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS. WAVES BUILDING TO 9 TO
12 FEET OCCASIONALLY TO 15 FEET...THEN SUBSIDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.TONIGHT...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST AFTER
MIDNIGHT. RAIN SHOWERS LIKELY. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY THROUGH EARLY
AFTERNOON WITH A CHANCE OF FREEZING RAIN...THEN A CHANCE OF
RAIN...SLEET AND AND SNOW. WAVES SUBSIDING TO 2 TO 4 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES SUBSIDING TO 1 TO 3
FEET.
.FRIDAY...WEST WINDS 15 TO 25 KNOTS. WAVES 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS...THEN RAIN SHOWERS...
POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.

$$

LSZ266-261615-
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-
412 AM EDT WED APR 26 2017

.EARLY THIS MORNING...NORTHEAST GALES TO 35 KNOTS. RAIN SHOWERS.
WAVES 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
.TODAY...EAST GALES TO 40 KNOTS. RAIN SHOWERS. WAVES BUILDING TO
10 TO 14 FEET OCCASIONALLY TO 18 FEET...THEN SUBSIDING TO 9 TO
12 FEET OCCASIONALLY TO 15 FEET.
.TONIGHT...EAST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS. WAVES SUBSIDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY...THEN A CHANCE OF
FREEZING RAIN AND SNOW BY MID AFTERNOON. WAVES SUBSIDING TO 2 TO
4 FEET.
.THURSDAY NIGHT...WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7
FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.FRIDAY...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN AND SNOW
SHOWERS. WAVES 2 TO 4 FEET.
.FRIDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING EAST. WAVES
BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW...
THEN RAIN SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.

$$

LSZ267-261615-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
412 AM EDT WED APR 26 2017

.EARLY THIS MORNING...EAST WINDS 20 TO 30 KNOTS. RAIN SHOWERS.
WAVES 2 TO 4 FEET BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TODAY...EAST WINDS 20 TO 30 KNOTS BECOMING SOUTHEAST BY MID
AFTERNOON. GALE FORCE GUSTS TO 35 KNOTS. A CHANCE OF RAIN SHOWERS
THROUGH EARLY AFTERNOON...THEN RAIN SHOWERS LIKELY BY MID
AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11
FEET...THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TONIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS. RAIN SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
20 TO 30 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY. WAVES
BUILDING TO 2 TO 4 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A SLIGHT
CHANCE OF SNOW AFTER MIDNIGHT. WAVES 2 TO 4 FEET.
.FRIDAY...SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN THROUGH EARLY AFTERNOON.
WAVES SUBSIDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING EAST 10 TO
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS.
A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW...THEN RAIN
SHOWERS...POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.

$$

LSZ261-261615-
MAFOR 2609/
SUPERIOR WEST...GALE WARNING IN EFFECT...14166 13150 11830.
CHANCE OF FREEZING RAIN. WAVES 8 TO 11 FEET BUILDING TO 12 TO 16
FEET TODAY. WAVES 10 TO 13 FEET SUBSIDING TO 5 TO 9 FEET TONIGHT.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11156 13166
13156 11846. CHANCE OF FREEZING RAIN. WAVES 9 TO 13 FEET BUILDING
TO 11 TO 15 FEET TODAY. WAVES 10 TO 14 FEET SUBSIDING TO 6 TO 10
FEET TONIGHT.

SUPERIOR SOUTH CENTRAL 11146 11156 11256 11246 11826 13726.
WAVES 3 TO 6 FEET BUILDING TO 8 TO 12 FEET TODAY. WAVES 5 TO 9
FEET SUBSIDING TO 4 TO 6 FEET TONIGHT.

SUPERIOR EAST 12156 11266 11256 11246 12336 11326. WAVES 3 TO 5
FEET BUILDING TO 7 TO 11 FEET TODAY. WAVES 5 TO 8 FEET SUBSIDING
TO 2 TO 4 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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