Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 230158
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
958 PM EDT SAT AUG 22 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 TONIGHT INTO
SUNDAY...A 29.4 INCH LOW PRESSURE NEAR THE BOUNDARY WATERS OF
MINNESOTA WILL MOVE TO FAR NORTHWEST ONTARIO...ALLOWING A COLD FRONT
TO SWEEP ACROSS LAKE SUPERIOR LATE ON SUNDAY. EXPECT THIS LOW TO
SLOWLY MOVE TO JAMES BAY BY TUESDAY AFTERNOON WHILE WEAKENING TO 29.8
INCHES. 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.

LSZ162-231000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
958 PM EDT SAT AUG 22 2015 /858 PM CDT SAT AUG 22 2015/

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

.REST OF TONIGHT...SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FEET BUILDING TO 3 TO
5 FEET.
.SUNDAY...SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO
35 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF THUNDERSTORMS
THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET...THEN BUILDING TO 5 TO 8 FEET.
.SUNDAY NIGHT...WEST GALES TO 35 KNOTS. A CHANCE OF SHOWERS.
WAVES 4 TO 7 FEET.
.MONDAY...WEST GALES TO 35 KNOTS VEERING NORTHWEST BY MID
AFTERNOON. A CHANCE OF SHOWERS. WAVES 4 TO 8 FEET.
.MONDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO 3 TO 5 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 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES
CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. A
CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$

LSZ263-231000-
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-
958 PM EDT SAT AUG 22 2015

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

.REST OF TONIGHT...SOUTH WINDS 20 TO 30 KNOTS. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FEET BUILDING TO 3 TO
6 FEET.
.SUNDAY...SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO
35 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF THUNDERSTORMS
THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF SHOWERS. WAVES
3 TO 5 FEET...THEN BUILDING TO 7 TO 10 FEET.
.SUNDAY NIGHT...WEST GALES TO 35 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO 6 TO 9 FEET.
.MONDAY...WEST GALES TO 35 KNOTS. 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 6 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 15 TO 25 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 INCREASING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS. A CHANCE OF THUNDERSTORMS. WAVES
BUILDING TO 1 TO 3 FEET.

$$

LSZ264-231000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
958 PM EDT SAT AUG 22 2015

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

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

$$

LSZ265-231000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
958 PM EDT SAT AUG 22 2015

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

$$

LSZ266-231000-
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-
958 PM EDT SAT AUG 22 2015

.REST OF TONIGHT...SOUTH WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES 3 TO 6 FEET
BUILDING TO 4 TO 7 FEET.
.SUNDAY...SOUTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. SHOWERS LIKELY THROUGH EARLY
AFTERNOON. A CHANCE OF THUNDERSTORMS. A CHANCE OF SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET...THEN SUBSIDING TO 3 TO
5 FEET.
.SUNDAY NIGHT...WEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS.
WAVES BUILDING TO 4 TO 8 FEET.
.MONDAY...WEST GALES TO 35 KNOTS DIMINISHING TO 20 TO 30 KNOTS BY
MID AFTERNOON. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON...THEN
SHOWERS LIKELY BY MID AFTERNOON. WAVES 4 TO 7 FEET.
.MONDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF
SHOWERS. WAVES 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 20 TO 30 KNOTS. WAVES 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...SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES BUILDING
TO 1 TO 3 FEET.

$$

LSZ267-231000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
958 PM EDT SAT AUG 22 2015

.REST OF TONIGHT...SOUTH WINDS 15 TO 25 KNOTS BACKING SOUTHEAST
AFTER MIDNIGHT. WAVES 2 TO 4 FEET.
.SUNDAY...SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH 15 TO
25 KNOTS BY MID AFTERNOON. SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS. WAVES BUILDING TO 3 TO 5 FEET...THEN SUBSIDING TO
2 TO 4 FEET.
.SUNDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 3 TO 5 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO 25 KNOTS
BY MID AFTERNOON. SHOWERS LIKELY. WAVES BUILDING TO 4 TO 7 FEET...
THEN SUBSIDING TO 3 TO 6 FEET.
.MONDAY NIGHT...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST
20 TO 30 KNOTS AFTER MIDNIGHT. SHOWERS LIKELY. WAVES 3 TO 5 FEET.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KNOTS. SHOWERS LIKELY. WAVES
SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF
SHOWERS. WAVES 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
CALM TO 2 FEET.

$$
LSZ261-231000-
MAFOR 2303/
SUPERIOR WEST...GALE WARNING IN EFFECT...11430 11436 12530 11540
11550 12650. CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT
THROUGH LATE SUNDAY MORNING. WAVES 3 TO 5 FEET OVERNIGHT BUILDING
TO 6 TO 9 FEET SUNDAY AND SUNDAY EVENING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...12440 11340
11446 11430 11530 11540 11650. CHANCE OF SHOWERS AND THUNDERSTORMS
LATE IN THE MORNING THROUGH LATE SUNDAY EVENING. WAVES 3 TO 8 FEET
OVERNIGHT AND SUNDAY. WAVES BUILDING TO 7 TO 10 FEET SUNDAY EVENING.

SUPERIOR SOUTH CENTRAL 13440 11446 11430 11420 12640. CHANCE OF
SHOWERS AND THUNDERSTORMS LATE IN THE MORNING THROUGH LATE SUNDAY
EVENING. WAVES 2 TO 6 FEET.

SUPERIOR EAST 12430 12330 11336 11436 11426 11620. CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY IN THE AFTERNOON THROUGH LATE SUNDAY
EVENING. WAVES 2 TO 6 FEET.

$$

JS


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