Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 230803
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
403 AM EDT SUN AUG 23 2015

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...AS A 30.2 INCH HIGH PRESSURE SYSTEM CENTERED OVER THE
SAINT LAWRENCE VALLEY MOVES INTO THE CANADIAN MARITIMES TODAY...A
29.4 INCH LOW PRESSURE TO THE NORTH OF THE LAKE OF THE WOODS
WILL BEGIN TO SLOWLY MOVE EAST ACROSS NORTHERN ONTARIO. THIS
WILL ALLOW A COLD FRONT TO SWEEP ACROSS LAKE SUPERIOR TODAY. EXPECT
THIS LOW TO CONTINUE IS SLOW TRIP EAST TO JAMES BAY BY TUESDAY
AFTERNOON WHILE WEAKENING TO 29.8 INCHES. AS THAT OCCURS...IT WILL
SWEEP ANOTHER TROUGH OF 29.6 INCHES ACROSS LAKE SUPERIOR LATE
TONIGHT THROUGH MONDAY NIGHT. A HIGH PRESSURE RIDGE OF 30.1 INCHES
WILL BUILD ACROSS THE PLAINS TUESDAY INTO WEDNESDAY...AND ACROSS THE
GREAT LAKES ON THURSDAY AS THE LOW EXITS TO QUEBEC.

LSZ162-231615-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
403 AM EDT SUN AUG 23 2015 /303 AM CDT SUN AUG 23 2015/

...GALE WARNING IN EFFECT FROM 2 PM EDT /1 PM CDT/ THIS AFTERNOON
THROUGH MONDAY EVENING...

.EARLY THIS MORNING...SOUTHWEST WINDS 15 TO 25 KNOTS. SCATTERED
SHOWERS AND ISOLATED THUNDERSTORMS. WAVES 3 TO 5 FEET.
.TODAY...SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO
35 KNOTS BY MID AFTERNOON. ISOLATED SHOWERS. WAVES BUILDING TO
5 TO 8 FEET.
.TONIGHT...WEST GALES TO 35 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 4 TO 7 FEET.
.MONDAY...NORTHWEST GALES TO 35 KNOTS. A CHANCE OF SHOWERS. WAVES
4 TO 7 FEET.
.MONDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.WEDNESDAY...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ263-231615-
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-
403 AM EDT SUN AUG 23 2015

...GALE WARNING IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
MONDAY EVENING...

.EARLY THIS MORNING...SOUTH WINDS 15 TO 25 KNOTS. NUMEROUS
SHOWERS AND ISOLATED THUNDERSTORMS. WAVES 3 TO 5 FEET.
.TODAY...SOUTHWEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS BY MID AFTERNOON. ISOLATED THUNDERSTORMS THROUGH EARLY
AFTERNOON. SCATTERED SHOWERS. WAVES BUILDING TO 6 TO 9 FEET.
.TONIGHT...WEST GALES TO 35 KNOTS. A CHANCE OF SHOWERS. WAVES
BUILDING TO 6 TO 10 FEET.
.MONDAY...WEST GALES TO 35 KNOTS VEERING NORTHWEST BY MID
AFTERNOON. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 5 TO 8 FEET.
.MONDAY NIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
3 TO 5 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING
TO CALM TO 2 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.

$$

LSZ264-231615-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
403 AM EDT SUN AUG 23 2015

...GALE WARNING IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH
MONDAY EVENING...

.EARLY THIS MORNING...SOUTH WINDS 20 TO 30 KNOTS. SCATTERED
SHOWERS AND ISOLATED THUNDERSTORMS. WAVES 3 TO 6 FEET BUILDING TO
4 TO 7 FEET.
.TODAY...SOUTH WINDS 15 TO 25 KNOTS VEERING SOUTHWEST BY MID
AFTERNOON. NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS THROUGH
EARLY AFTERNOON...THEN ISOLATED SHOWERS BY MID AFTERNOON. WAVES
SUBSIDING TO 3 TO 5 FEET...THEN BUILDING TO 5 TO 8 FEET.
.TONIGHT...WEST GALES TO 35 KNOTS DIMINISHING TO 20 TO 30 KNOTS
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES BUILDING TO 7 TO
10 FEET...THEN SUBSIDING TO 5 TO 8 FEET.
.MONDAY...WEST GALES TO 35 KNOTS BECOMING NORTHWEST 20 TO
30 KNOTS BY MID AFTERNOON. SHOWERS LIKELY THROUGH EARLY
AFTERNOON...THEN A CHANCE OF SHOWERS BY MID AFTERNOON. WAVES
SUBSIDING TO 3 TO 6 FEET.
.MONDAY NIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES BUILDING TO
4 TO 7 FEET...THEN SUBSIDING TO 3 TO 6 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.

$$

LSZ265-231615-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
403 AM EDT SUN AUG 23 2015

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

.EARLY THIS MORNING...SOUTH WINDS 20 TO 30 KNOTS. ISOLATED
SHOWERS AND THUNDERSTORMS. WAVES 3 TO 5 FEET.
.TODAY...SOUTH WINDS 15 TO 25 KNOTS VEERING WEST BY MID
AFTERNOON. NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS THROUGH
EARLY AFTERNOON...THEN ISOLATED SHOWERS BY MID AFTERNOON. WAVES
SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 2 TO 4 FEET.
.TONIGHT...WEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT...
THEN SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO 3 TO
6 FEET.
.MONDAY...WEST GALES TO 35 KNOTS. SHOWERS LIKELY. WAVES BUILDING
TO 4 TO 7 FEET...THEN SUBSIDING TO 3 TO 6 FEET.
.MONDAY NIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
3 TO 5 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST.
WAVES CALM TO 2 FEET.

$$

LSZ266-231615-
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-
403 AM EDT SUN AUG 23 2015

.EARLY THIS MORNING...SOUTH WINDS 15 TO 25 KNOTS. WAVES 3 TO
6 FEET BUILDING TO 4 TO 7 FEET.
.TODAY...SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
BY MID AFTERNOON. NUMEROUS SHOWERS THROUGH EARLY AFTERNOON.
ISOLATED THUNDERSTORMS. SCATTERED SHOWERS BY MID AFTERNOON. WAVES
SUBSIDING TO 2 TO 4 FEET...THEN BUILDING TO 3 TO 5 FEET.
.TONIGHT...WEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS. WAVES
BUILDING TO 4 TO 8 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS TO
35 KNOTS. SHOWERS LIKELY. WAVES SUBSIDING TO 3 TO 6 FEET.
.MONDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH
MIDNIGHT...THEN SHOWERS LIKELY AFTER MIDNIGHT. WAVES 3 TO 6 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS. SHOWERS LIKELY THROUGH
EARLY AFTERNOON...THEN A CHANCE OF SHOWERS BY MID AFTERNOON.
WAVES SUBSIDING TO 3 TO 5 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
.WEDNESDAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES
BUILDING TO 1 TO 3 FEET.

$$

LSZ267-231615-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
403 AM EDT SUN AUG 23 2015

.EARLY THIS MORNING...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES 2 TO
4 FEET.
.TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS VEERING SOUTH BY MID
AFTERNOON. SCATTERED SHOWERS THROUGH EARLY AFTERNOON. ISOLATED
THUNDERSTORMS. NUMEROUS SHOWERS BY MID AFTERNOON. WAVES SUBSIDING
TO 1 TO 3 FEET.
.TONIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 3 TO 5 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS. SHOWERS LIKELY. WAVES
BUILDING TO 3 TO 6 FEET.
.MONDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS. WAVES BUILDING TO
3 TO 5 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
.WEDNESDAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST.
WAVES CALM TO 2 FEET.

$$

LSZ261-231615-
MAFOR 2309/
SUPERIOR WEST...GALE WARNING IN EFFECT...12530 11540 11550 14650.
SCATTERED SHOWERS WITH ISOLATED THUNDERSTORMS THROUGH MID MORNING.
CHANCE OF SHOWERS LATE TONIGHT. WAVES 3 TO 6 FEET BUILDING TO 5 TO
9 FEET LATE TODAY AND TONIGHT.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11430 11436
11526 11530 11540 11550 11650 11640. SCATTERED SHOWERS WITH
ISOLATED THUNDERSTORMS THROUGH MID MORNING. NUMEROUS SHOWERS WITH
ISOLATED THUNDERSTORMS LATE THIS MORNING...THEN SCATTERED SHOWERS
WITH ISOLATED THUNDERSTORMS EARLY THIS AFTERNOON. CHANCE OF SHOWERS
LATE TONIGHT. WAVES 3 TO 7 FEET TODAY. WAVES BUILDING TO 5 TO 9 FEET
TONIGHT.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11430 12436
11520 14640. SCATTERED SHOWERS WITH ISOLATED THUNDERSTORMS
THROUGH MID MORNING. NUMEROUS SHOWERS WITH ISOLATED THUNDERSTORMS
LATE THIS MORNING...THEN SCATTERED SHOWERS WITH ISOLATED
THUNDERSTORMS EARLY THIS AFTERNOON. CHANCE OF SHOWERS AFTER MIDNIGHT
TONIGHT. WAVES 1 TO 5 FEET TODAY. WAVES BUILDING TO 3 TO 6 FEET
TONIGHT.

SUPERIOR EAST 12320 11336 11436 11420 12620 11630. NUMEROUS SHOWERS
WITH ISOLATED THUNDERSTORMS EARLY THIS AFTERNOON. SCATTERED SHOWERS
WITH ISOLATED THUNDERSTORMS LATE THIS AFTERNOON AND EVENING. CHANCE
OF SHOWERS AFTER MIDNIGHT TONIGHT. WAVES 2 TO 5 FEET.

$$

KC


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