Great Lakes Forecast
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000
FZUS63 KMQT 301418
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1018 AM EDT SUN APR 30 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...HIGH PRESSURE OF 30.4 INCHES CENTERED NEAR JAMES BAY
WILL MOVE OVER QUEBEC THIS AFTERNOON AND TONIGHT. MEANWHILE...LOW
PRESSURE OF 29.6 INCHES OVER THE SOUTHERN PLAINS WILL DEEPEN TO
29.2 INCHES AS IT LIFTS NORTHEAST...REACHING CENTRAL UPPER
MICHIGAN MONDAY EVENING AND QUEBEC TUESDAY AFTERNOON. IN ITS
WAKE...A HIGH PRESSURE RIDGE OF 29.9 INCHES DEVELOPING OVER THE
UPPER MISSISSIPPI VALLEY TUESDAY AFTERNOON WILL BUILD TO 30.1
INCHES OVER THE GREAT LAKES REGION ON WEDNESDAY. THE RIDGE WILL
THEN WEAKEN ON THURSDAY AS A LOW PRESSURE TROUGH OF 29.9 INCHES
APPROACHES FROM THE NORTHWEST.

LSZ162-302230-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1018 AM EDT SUN APR 30 2017 /918 AM CDT SUN APR 30 2017/

...GALE WARNING IN EFFECT FROM 8 PM EDT /7 PM CDT/ THIS EVENING
THROUGH MONDAY AFTERNOON...

.REST OF TODAY...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
20 TO 30 KNOTS BY MID AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
40 KNOTS AFTER MIDNIGHT. SCATTERED RAIN SHOWERS THROUGH
MIDNIGHT...THEN RAIN SHOWERS. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. SCATTERED SNOW SHOWERS
THROUGH EARLY AFTERNOON...THEN SNOW SHOWERS. RAIN SHOWERS.
WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET...THEN
SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY
THROUGH MIDNIGHT...THEN SCATTERED 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. SCATTERED SNOW SHOWERS THROUGH EARLY
AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST 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
CALM TO 2 FEET.

$$

LSZ263-302230-
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-
1018 AM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
EVENING...

.REST OF TODAY...NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS BY MID AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
40 KNOTS AFTER MIDNIGHT. SCATTERED RAIN SHOWERS THROUGH
MIDNIGHT...THEN RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
3 TO 6 FEET OCCASIONALLY TO 8 FEET...THEN BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. ISOLATED SNOW SHOWERS
THROUGH EARLY AFTERNOON...THEN SNOW SHOWERS. RAIN SHOWERS.
WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET...THEN
SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH
AFTER MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY. WAVES
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. SCATTERED SNOW SHOWERS THROUGH EARLY
AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH
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
CALM TO 2 FEET.

$$

LSZ264-302230-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1018 AM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
EVENING...

.REST OF TODAY...EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST BY
MID AFTERNOON. WAVES 1 TO 3 FEET.
.TONIGHT...NORTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST GALES TO
35 KNOTS AFTER MIDNIGHT. ISOLATED RAIN SHOWERS THROUGH MIDNIGHT...
THEN RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. SCATTERED SNOW SHOWERS
THROUGH EARLY AFTERNOON...THEN SNOW SHOWERS. RAIN SHOWERS. A
SLIGHT CHANCE OF THUNDERSTORMS THROUGH EARLY AFTERNOON. WAVES
BUILDING TO 6 TO 10 FEET OCCASIONALLY TO 13 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH
AFTER MIDNIGHT. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS.
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. SCATTERED RAIN AND SNOW SHOWERS. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 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...WEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES CALM TO
2 FEET.

$$

LSZ265-302230-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1018 AM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
AFTERNOON...

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

$$

LSZ266-302230-
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-
1018 AM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH MONDAY
AFTERNOON...

.REST OF TODAY...EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS BY MID AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO
2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO GALES TO
35 KNOTS AFTER MIDNIGHT. ISOLATED RAIN SHOWERS THROUGH MIDNIGHT...
THEN RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.MONDAY...EAST GALES TO 35 KNOTS DIMINISHING TO 20 TO 30 KNOTS BY
MID AFTERNOON. A SLIGHT CHANCE OF THUNDERSTORMS THROUGH EARLY
AFTERNOON. RAIN SHOWERS. 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. NUMEROUS SNOW SHOWERS AFTER
MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 20 TO
30 KNOTS BY MID AFTERNOON. SCATTERED RAIN AND SNOW SHOWERS. WAVES
BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET...THEN SUBSIDING
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
CALM TO 2 FEET.

$$

LSZ267-302230-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1018 AM EDT SUN APR 30 2017

.REST OF TODAY...EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST BY
MID AFTERNOON. ISOLATED RAIN SHOWERS BY MID AFTERNOON. WAVES CALM
TO 2 FEET.
.TONIGHT...EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT. SCATTERED RAIN SHOWERS THROUGH
MIDNIGHT...THEN RAIN SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS
AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS WITH A FEW GALE FORCE GUSTS
TO 35 KNOTS BECOMING SOUTHEAST 15 TO 25 KNOTS BY MID AFTERNOON. A
SLIGHT CHANCE OF THUNDERSTORMS THROUGH EARLY AFTERNOON. RAIN
SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH
5 TO 15 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY. WAVES
SUBSIDING TO CALM TO 2 FEET.
.TUESDAY...NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. SCATTERED RAIN AND SNOW SHOWERS. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS BACKING EAST. WAVES CALM
TO 2 FEET.

$$
LSZ261-302230-
MAFOR 3015/
SUPERIOR WEST...GALE WARNING IN EFFECT...12130 13140 13156.
SCATTERED RAIN SHOWERS AFTER MIDNIGHT TONIGHT. SCATTERED SNOW
SHOWERS MONDAY MORNING. WAVES 2 TO 7 FEET THIS AFTERNOON AND
TONIGHT. WAVES 6 TO 9 FEET BUILDING TO 8 TO 11 FEET MONDAY
MORNING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11220 13120
11230 11140 12156. SCATTERED RAIN SHOWERS AFTER MIDNIGHT TONIGHT.
WAVES 2 TO 6 FEET THIS AFTERNOON AND TONIGHT BUILDING TO 5 TO 9
FEET MONDAY MORNING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...12220 11120
11220 11230 11246 12256. SCATTERED RAIN SHOWERS AFTER MIDNIGHT
TONIGHT. WAVES 2 TO 6 FEET THIS AFTERNOON AND TONIGHT BUILDING TO
5 TO 9 FEET MONDAY MORNING.

SUPERIOR EAST...GALE WARNING IN EFFECT...11120 11110 12120 11230
11146 11156 11256. WAVES 1 TO 5 FEET THIS AFTERNOON AND TONIGHT
BUILDING TO 4 TO 7 FEET MONDAY MORNING.

$$

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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