Great Lakes Forecast
Issued by NWS

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122
FZUS63 KMQT 221959
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
359 PM EDT SAT APR 22 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...AS HIGH PRESSURE OF 30.2 INCHES OVER THE UPPER GREAT
LAKES REACHES THE LOWER GREAT LAKES BY SUNDAY MORNING...A 30.0
INCH TROUGH FROM JAMES BAY TO NORTHERN MINNESOTA WILL MOVE ACROSS
THE UPPER LAKES. ON SUNDAY...EXPECT THIS TROUGH TO LINGER OVER
NORTHERN LAKE HURON AND NORTHERN LAKE MICHIGAN ON THE SOUTHERN
FLANK OF A 30.4 INCH HIGH PRESSURE RIDGE THAT WILL BUILD OVER FAR
NORTHERN ONTARIO BY LATE SUNDAY AFTERNOON. AS THIS RIDGE DRIFTS TO
THE EAST AND THROUGH THE CANADIAN MARITIMES...A 29.5 INCH LOW
PRESSURE SYSTEM OVER THE NORTHERN PLAINS ON MONDAY WILL TRACK
ACROSS WESTERN LAKE SUPERIOR ON TUESDAY AND EXIT INTO QUEBEC ON
TUESDAY NIGHT WHILE ANOTHER LOW PRESSURE SYSTEM OF 29.4 INCHES
MOVES FROM THE CENTRAL PLAINS TO THE UPPER GREAT LAKES. THE LOW IS
EXPECTED TO MOVE ACROSS THE UPPER GREAT LAKES AT 29.3 INCHES ON
WEDNESDAY.

LSZ162-230400-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
359 PM EDT SAT APR 22 2017 /259 PM CDT SAT APR 22 2017/

.LATE THIS AFTERNOON...SOUTHWEST WINDS 15 TO 25 KNOTS. A SLIGHT
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FEET.
.TONIGHT...WEST WINDS 10 TO 20 KNOTS VEERING NORTH AFTER
MIDNIGHT...THEN VEERING NORTHEAST LATE. A CHANCE OF RAIN THROUGH
MIDNIGHT...THEN RAIN...POSSIBLY MIXED WITH SNOW AFTER MIDNIGHT.
WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST IN THE
AFTERNOON. A CHANCE OF RAIN AND SNOW. WAVES BUILDING TO 1 TO
3 FEET.
.SUNDAY NIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO
30 KNOTS. SCATTERED SNOW SHOWERS THROUGH MIDNIGHT. A CHANCE OF
RAIN SHOWERS. NUMEROUS SNOW SHOWERS...POSSIBLY MIXED WITH
FREEZING RAIN AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. ISOLATED SNOW SHOWERS THROUGH EARLY AFTERNOON.
A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...EAST WINDS 20 TO 30 KNOTS BECOMING SOUTH 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY. WAVES SUBSIDING TO
2 TO 4 FEET.
.TUESDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...NORTHEAST WINDS 15 TO 25 KNOTS. SCATTERED SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.WEDNESDAY...NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH.
SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES BUILDING
TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET...THEN SUBSIDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET.
.THURSDAY...NORTH WINDS 10 TO 20 KNOTS VEERING EAST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ263-230400-
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-
359 PM EDT SAT APR 22 2017

.LATE THIS AFTERNOON...SOUTHWEST WINDS 15 TO 25 KNOTS. A SLIGHT
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. A CHANCE OF RAIN THROUGH MIDNIGHT...THEN RAIN...
POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 2 TO 4 FEET.
.SUNDAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED WITH
RAIN. WAVES SUBSIDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. SCATTERED SNOW
SHOWERS THROUGH MIDNIGHT. NUMEROUS SNOW SHOWERS...POSSIBLY MIXED
WITH FREEZING RAIN AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS THROUGH EARLY AFTERNOON.
A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...EAST WINDS 20 TO 30 KNOTS BECOMING SOUTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...WEST WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO 20 KNOTS
BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO
1 TO 3 FEET...THEN BUILDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST
20 TO 30 KNOTS AFTER MIDNIGHT. SCATTERED SNOW SHOWERS. WAVES
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH.
NUMEROUS SNOW SHOWERS...THEN SCATTERED SNOW SHOWERS...POSSIBLY
MIXED WITH RAIN. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO
14 FEET...THEN SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO 1 TO 3 FEET.

$$

LSZ264-230400-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
359 PM EDT SAT APR 22 2017

.LATE THIS AFTERNOON...SOUTHWEST WINDS 15 TO 25 KNOTS. A SLIGHT
CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FEET.
.TONIGHT...WEST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH MIDNIGHT...THEN
RAIN LIKELY...POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 2 TO 4
FEET.
.SUNDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS IN THE AFTERNOON...THEN VEERING EAST LATE. A SLIGHT
CHANCE OF SNOW THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO CALM
TO 2 FEET.
.SUNDAY NIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS LATE. SCATTERED SNOW SHOWERS. WAVES CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS THROUGH EARLY AFTERNOON.
A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT...THEN RAIN SHOWERS LIKELY AFTER
MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. SCATTERED SNOW SHOWERS. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH.
NUMEROUS SNOW SHOWERS...THEN SCATTERED SNOW SHOWERS. WAVES
BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET...THEN SUBSIDING
TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO 1 TO 3 FEET.

$$

LSZ265-230400-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
359 PM EDT SAT APR 22 2017

.LATE THIS AFTERNOON...SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM
TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT...THEN VEERING NORTH LATE. A CHANCE OF RAIN. A CHANCE OF
SNOW AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN THROUGH EARLY
AFTERNOON. A CHANCE OF SNOW. WAVES BUILDING TO 2 TO 4 FEET...THEN
SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. SCATTERED SNOW SHOWERS. WAVES CALM TO
2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH
RAIN THROUGH EARLY AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT...THEN RAIN SHOWERS LIKELY AFTER
MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS
THROUGH MIDNIGHT...THEN NUMEROUS SNOW SHOWERS...POSSIBLY MIXED
WITH RAIN. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTH WINDS 20 TO 30 KNOTS. NUMEROUS SNOW SHOWERS.
WAVES BUILDING TO 8 TO 12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS. SCATTERED SNOW SHOWERS...
POSSIBLY MIXED WITH RAIN. WAVES SUBSIDING TO 1 TO 3 FEET.

$$

LSZ266-230400-
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-
359 PM EDT SAT APR 22 2017

.LATE THIS AFTERNOON...SOUTH WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT...THEN VEERING NORTH LATE. A CHANCE OF RAIN. A CHANCE OF
SNOW AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 2 TO 4 FEET.
.SUNDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS. A CHANCE OF RAIN AND SNOW THROUGH EARLY AFTERNOON.
WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS AFTER MIDNIGHT...THEN VEERING EAST LATE. SCATTERED
SNOW SHOWERS. WAVES CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS THROUGH EARLY AFTERNOON.
A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN
SHOWERS. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTH WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS THROUGH
MIDNIGHT...THEN NUMEROUS SNOW SHOWERS...POSSIBLY MIXED WITH RAIN.
WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH.
NUMEROUS SNOW SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES BUILDING
TO 8 TO 12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO 2 TO 4 FEET.

$$

LSZ267-230400-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
359 PM EDT SAT APR 22 2017

.LATE THIS AFTERNOON...SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TONIGHT...SOUTH WINDS 10 TO 20 KNOTS VEERING WEST AFTER
MIDNIGHT...THEN VEERING NORTH LATE. A CHANCE OF RAIN...POSSIBLY
MIXED WITH SNOW AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST LATE. A
CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST LATE.
SCATTERED SNOW SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH
RAIN THROUGH EARLY AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING
TO 2 TO 4 FEET...THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
.TUESDAY...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT...THEN
RAIN SHOWERS LIKELY WITH A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. NUMEROUS RAIN AND
SNOW SHOWERS. WAVES BUILDING TO 6 TO 10 FEET OCCASIONALLY TO 13
FEET.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH.
SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES
SUBSIDING TO 2 TO 4 FEET.

$$

LSZ261-230400-
MAFOR 2221/
SUPERIOR WEST 11530 11630 11810 11116 11117 11120 11220 11210.
CHANCE OF RAIN AND SNOW LATE SUNDAY MORNING AND SUNDAY AFTERNOON.
WAVES 1 TO 3 FEET.

SUPERIOR NORTH CENTRAL 11530 11630 11820 11827 11826 11820 11120
11110. CHANCE OF RAIN AND SNOW OVERNIGHT. WAVES 1 TO 4 FEET.

SUPERIOR SOUTH CENTRAL 12520 11610 11810 13820 11110. CHANCE OF
RAIN LATE TONIGHT. CHANCE OF RAIN AND SNOW SUNDAY MORNING. WAVES
1 TO 4 FEET.

SUPERIOR EAST 12420 11610 11710 13820 11810. CHANCE OF RAIN AND
SNOW LATE TONIGHT AND SUNDAY MORNING. WAVES 1 TO 4 FEET.

$$

KLUBER

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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