Great Lakes Forecast
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398
FZUS63 KMQT 010205
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1005 PM 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...LOW PRESSURE OF 29.4 INCHES OVER THE MID MISSISSIPPI
VALLEY WILL CONTINUE TO MOVE NORTHEAST...REACHING UPPER MICHIGAN BY
MONDAY AFTERNOON WHILE DEEPENING TO 29.2 INCHES. THE LOW WILL
CONTINUE TO TREK NORTHEAST INTO SOUTHERN QUEBEC BY TUESDAY AFTERNOON
WHILE FILLING TO 29.3 INCHES. A HIGH PRESSURE RIDGE OF 29.9 INCHES
DEVELOPING OVER THE UPPER MISSISSIPPI VALLEY TUESDAY AFTERNOON WILL
BUILD TO 30.2 INCHES OVER THE GREAT LAKES REGION ON WEDNESDAY
AFTERNOON. THIS RIDGE WILL THEN WEAKEN ON THURSDAY MORNING AS A LOW
PRESSURE TROUGH OF 29.9 INCHES APPROACHES FROM THE NORTHWEST. A 30.1
INCH RIDGE FOLLOWS ON THURSDAY AFTERNOON AND WEAKENS TO 30.0 INCHES
OVER THE UPPER GREAT LAKES ON FRIDAY.

LSZ162-011015-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1005 PM EDT SUN APR 30 2017 /905 PM CDT SUN APR 30 2017/

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

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

$$

LSZ263-011015-
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-
1005 PM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM 2 AM EDT MONDAY THROUGH MONDAY
EVENING...

.REST OF TONIGHT...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
GALES TO 40 KNOTS AFTER MIDNIGHT. SCATTERED RAIN SHOWERS. WAVES 3
TO 6 FEET OCCASIONALLY TO 8 FEET...THEN BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. ISOLATED THUNDERSTORMS
THROUGH EARLY AFTERNOON. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
SHOWERS. WAVES BUILDING TO 7 TO 11 FEET OCCASIONALLY TO 14 FEET.
.MONDAY NIGHT...NORTH GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. RAIN AND SNOW SHOWERS LIKELY THROUGH
MIDNIGHT...THEN RAIN SHOWERS LIKELY WITH A CHANCE OF SNOW SHOWERS
AFTER MIDNIGHT. WAVES SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10
FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...WITH A
CHANCE OF SNOW SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING
TO 2 TO 4 FEET.
.TUESDAY NIGHT...WEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS
THAN 10 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...WITH A CHANCE OF SNOW
SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES
BUILDING TO 1 TO 3 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-011015-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1005 PM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM 2 AM EDT MONDAY THROUGH MONDAY
EVENING...

.REST OF TONIGHT...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. SCATTERED RAIN SHOWERS AFTER
MIDNIGHT. WAVES 1 TO 3 FEET BUILDING TO 4 TO 7 FEET OCCASIONALLY
TO 9 FEET.
.MONDAY...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS AND ISOLATED
THUNDERSTORMS THROUGH EARLY AFTERNOON. RAIN SHOWERS MIXING WITH
SNOW SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 7 TO 11 FEET
OCCASIONALLY TO 14 FEET.
.MONDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH
AFTER MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY. WAVES
SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...WITH A
CHANCE OF SNOW SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING
TO 3 TO 5 FEET OCCASIONALLY TO 7 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 LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH
SNOW AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. A CHANCE
OF RAIN SHOWERS...WITH A CHANCE OF SNOW SHOWERS EARLY. WAVES
BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ265-011015-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1005 PM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM 2 AM EDT MONDAY THROUGH MONDAY
AFTERNOON...

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

$$

LSZ266-011015-
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-
1005 PM EDT SUN APR 30 2017

...GALE WARNING IN EFFECT FROM 2 AM EDT MONDAY THROUGH MONDAY
AFTERNOON...

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

$$

LSZ267-011015-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1005 PM EDT SUN APR 30 2017

.REST OF TONIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. ISOLATED RAIN SHOWERS BY LATE EVENING...
THEN RAIN SHOWERS AND ISOLATED THUNDERSTORMS AFTER MIDNIGHT.
WAVES 1 TO 3 FEET 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. A FEW GALE FORCE GUSTS TO 35 KNOTS
POSSIBLE IN THE MORNING. RAIN SHOWERS AND ISOLATED THUNDERSTORMS
THROUGH EARLY AFTERNOON...THEN SCATTERED RAIN SHOWERS BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH
5 TO 15 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
.TUESDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...WITH A
CHANCE OF SNOW SHOWERS THROUGH EARLY AFTERNOON. WAVES BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 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...NORTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.

$$
LSZ261-011015-
MAFOR 0103/
SUPERIOR WEST...GALE WARNING IN EFFECT...11130 12156 11167 12156
11157 11857. SCATTERED RAIN SHOWERS AFTER MIDNIGHT. SCATTERED
SNOW SHOWERS LATE MONDAY MORNING. WAVES 4 TO 7 FEET OVERNIGHT.
WAVES 6 TO 11 FEET MONDAY. WAVES 6 TO 10 FEET MONDAY EVENING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11130 11140
14156 12157. SCATTERED RAIN SHOWERS LATE OVERNIGHT. WAVES 2 TO 5
FEET OVERNIGHT. WAVES 5 TO 9 FEET BUILDING TO 7 TO 10 FEET MONDAY.
WAVES 6 TO 10 FEET MONDAY EVENING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11230 11240
13256 11236 11226 11216. SCATTERED RAIN SHOWERS AFTER MIDNIGHT.
WAVES 2 TO 5 FEET OVERNIGHT BUILDING TO 5 TO 9 FEET MONDAY. WAVES
3 TO 6 FEET MONDAY EVENING.

SUPERIOR EAST...GALE WARNING IN EFFECT...11130 11140 11156 12256
12230 11320. SCATTERED RAIN SHOWERS LATE OVERNIGHT AND MONDAY
EARLY EVENING. WAVES 2 TO 5 FEET OVERNIGHT. WAVES 4 TO 7 FEET
SUBSIDING TO 3 TO 6 FEET MONDAY. WAVES 3 TO 5 FEET SUBSIDING TO 2
TO 4 FEET MONDAY EVENING.

$$

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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