Great Lakes Forecast
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000
FZUS63 KMQT 291958
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
358 PM EDT SAT APR 29 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 OVER THE UPPER GREAT LAKES TONIGHT
WILL MOVE OVER EASTERN ONTARIO AND WESTERN QUEBEC ON SUNDAY AND
STRENGTHEN TO 30.5 INCHES AS A 29.4 INCH LOW DEVELOPS IN THE
CENTRAL PLAINS. ON MONDAY...THIS LOW WILL DEEPEN TO 29.1 INCHES AS
IT LIFTS NORTHEAST ACROSS WISCONSIN AND INTO CENTRAL UPPER
MICHIGAN. THE LOW WILL WEAKEN TO AROUND 29.2 INCHES AS IT
CONTINUES TO LIFT NORTHEAST INTO QUEBEC ON TUESDAY...LEAVING A
TROUGH AVERAGING 29.5 INCHES OVER THE UPPER GREAT LAKES. THE
PRESSURE GRADIENT WILL THEN RELAX ACROSS THE UPPER GREAT LAKES AS
A WEAK HIGH PRESSURE OF 30.2 INCHES MOVES IN. THIS HIGH BUILDS TO
30.3 INCHES ON THURSDAY...WHILE A LOW OF 29.6 INCHES LIFTS ACROSS
THE LOWER MISSISSIPPI RIVER VALLEY INTO THE TENNESSEE VALLEY.

LSZ162-300400-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
358 PM EDT SAT APR 29 2017 /258 PM CDT SAT APR 29 2017/

...GALE WARNING IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
AFTERNOON...

.LATE THIS AFTERNOON...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. SCATTERED RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.SUNDAY NIGHT...NORTHEAST GALES TO 40 KNOTS. SNOW LIKELY THROUGH
MIDNIGHT. RAIN. A CHANCE OF SNOW AFTER MIDNIGHT. WAVES BUILDING
TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS DIMINISHING TO 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS...POSSIBLY MIXED WITH
SNOW SHOWERS. WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO
13 FEET...THEN SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.MONDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS. RAIN SHOWERS AND SNOW
SHOWERS LIKELY THROUGH MIDNIGHT...THEN A CHANCE OF RAIN AND SNOW
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. A CHANCE OF SNOW SHOWERS THROUGH EARLY AFTERNOON. A
CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY NIGHT...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
CALM TO 2 FEET.

$$

LSZ263-300400-
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-
358 PM EDT SAT APR 29 2017

...GALE WARNING IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
EVENING...

.LATE THIS AFTERNOON...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. SCATTERED RAIN SHOWERS BY MID AFTERNOON. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.SUNDAY NIGHT...NORTHEAST GALES TO 40 KNOTS. A CHANCE OF RAIN
THROUGH MIDNIGHT. A CHANCE OF SNOW. RAIN AFTER MIDNIGHT. WAVES
BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 7 TO 10 FEET
OCCASIONALLY TO 13 FEET...THEN SUBSIDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS...POSSIBLY MIXED WITH
SNOW SHOWERS THROUGH MIDNIGHT...THEN A CHANCE OF RAIN AND SNOW
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN AND SNOW SHOWERS.
WAVES SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES
CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST.
WAVES CALM TO 2 FEET.

$$

LSZ264-300400-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
358 PM EDT SAT APR 29 2017

...GALE WARNING IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
EVENING...

.LATE THIS AFTERNOON...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. ISOLATED RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING
TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...NORTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH
MIDNIGHT. A CHANCE OF SNOW. RAIN AFTER MIDNIGHT. WAVES BUILDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.MONDAY...NORTHEAST GALES TO 35 KNOTS. RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 7 TO 10 FEET
OCCASIONALLY TO 13 FEET...THEN SUBSIDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS
LIKELY. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN AND SNOW
SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.

$$

LSZ265-300400-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
358 PM EDT SAT APR 29 2017

...GALE WARNING IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
AFTERNOON...

.LATE THIS AFTERNOON...NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. SCATTERED RAIN SHOWERS BY MID AFTERNOON. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO GALES TO
35 KNOTS AFTER MIDNIGHT. RAIN SHOWERS...WITH A CHANCE OF SNOW
THROUGH MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10
FEET.
.MONDAY...EAST GALES TO 35 KNOTS DIMINISHING TO 15 TO 25 KNOTS BY
MID AFTERNOON. RAIN SHOWERS LIKELY. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET...THEN SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.MONDAY NIGHT...EAST WINDS 10 TO 20 KNOTS BACKING NORTH AFTER
MIDNIGHT. RAIN SHOWERS LIKELY. A CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 2 TO
4 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN AND SNOW SHOWERS.
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET...THEN
SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING
TO CALM TO 2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
CALM TO 2 FEET.

$$

LSZ266-300400-
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-
358 PM EDT SAT APR 29 2017

...GALE WARNING IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY
AFTERNOON...

.LATE THIS AFTERNOON...NORTH WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO 20 KNOTS
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY...EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. SCATTERED RAIN SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.
.SUNDAY NIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO GALES TO
35 KNOTS AFTER MIDNIGHT. RAIN SHOWERS...WITH A CHANCE OF SNOW
THROUGH MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.MONDAY...EAST GALES TO 35 KNOTS BECOMING SOUTHEAST 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET...THEN SUBSIDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH
AFTER MIDNIGHT. RAIN SHOWERS LIKELY EARLY...THEN SNOW SHOWERS
LIKELY AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY
TO 7 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN AND SNOW SHOWERS.
WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS BACKING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.

$$

LSZ267-300400-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
358 PM EDT SAT APR 29 2017

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

$$

LSZ261-300400-
MAFOR 2921/
SUPERIOR WEST 12200 12110 12120 11130 11140. WAVES 2 FEET OR LESS
TONIGHT BUILDING TO 3 TO 5 FEET SUNDAY.

SUPERIOR NORTH CENTRAL 11710 11800 11100 11110 13220 11120. WAVES
3 FEET OR LESS.

SUPERIOR SOUTH CENTRAL 12810 12110 13220 11120. WAVES 1 TO 4 FEET.

SUPERIOR EAST 11710 11810 11120 13220 12120. WAVES 1 TO 4 FEET.

$$

RJT

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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