Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 280138
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
938 PM EDT MON JUL 27 2015

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...30.0 INCH HIGH PRESSURE OVER LOWER MICHIGAN WILL KEEP A
RIDGE AVERAGING 29.9 INCHES ACROSS LAKE SUPERIOR THROUGH EARLY
TUESDAY. A 29.4 INCH LOW OVER SOUTHERN SASKATCHEWAN TUESDAY MORNING
WILL RACE ACROSS MANITOBA TUESDAY NIGHT...AND ACROSS ONTARIO TO
HUDSON BAY WHILE DEEPENING TO 29.2 INCHES BY WEDNESDAY NIGHT. LOOK
FOR THIS AREA OF LOW PRESSURE TO REMAIN ACROSS HUDSON BAY THROUGH AT
LEAST SATURDAY. THE RESULT WILL BE A TROUGH EXTENDING DOWN THROUGH
LAKE SUPERIOR AVERAGING 29.7 INCHES TUESDAY NIGHT AND WEDNESDAY. THE
TROUGH WILL SHIFT TO THE NEW ENGLAND STATES THURSDAY...ALLOWING A
29.9 INCH RIDGE TO BUILD INTO THE UPPER GREAT LAKES THURSDAY. IT WILL
QUICKLY BE REPLACED BY A WEAK 29.8 INCH TROUGH ROTATING AROUND THE
HUDSON BAY LOW THURSDAY NIGHT INTO FRIDAY. A BRIEF 29.8 INCH RIDGE
BUILDS IN ON SATURDAY WHILE A 29.7 INCH TROUGH DEVELOPS OVER THE
NORTHERN PLAINS.

LSZ162-280945-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TUESDAY...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST BY MID
AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO
2 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND
THUNDERSTORMS THROUGH MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.WEDNESDAY...SOUTHWEST WINDS 20 TO 30 KNOTS VEERING WEST BY MID
AFTERNOON. A FEW GALE FORCE GUSTS TO 35 KNOTS BY MID AFTERNOON.
WAVES BUILDING TO 3 TO 6 FEET.
.WEDNESDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO
1 TO 3 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS.
WAVES CALM TO 2 FEET.
.SATURDAY...WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$

LSZ263-280945-
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-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.TUESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET.
.WEDNESDAY...SOUTHWEST WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS
TO 35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET.
.WEDNESDAY NIGHT...WEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING TO
2 TO 4 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS.
WAVES CALM TO 2 FEET.
.SATURDAY...WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$

LSZ264-280945-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS. PATCHY FOG.
WAVES CALM TO 2 FEET.
.TUESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS
AND THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET.
.WEDNESDAY...SOUTHWEST WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS
TO 35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET.
.WEDNESDAY NIGHT...WEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING TO
2 TO 4 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ265-280945-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
LESS THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.TUESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS
AND THUNDERSTORMS THROUGH MIDNIGHT...THEN SHOWERS AND
THUNDERSTORMS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO 2 TO
4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.WEDNESDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY MID
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH
EARLY AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 1 TO 3 FEET.
.WEDNESDAY NIGHT...WEST WINDS 20 TO 30 KNOTS. WAVES 1 TO 3 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. A CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$

LSZ266-280945-
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-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
AFTER MIDNIGHT. PATCHY FOG. WAVES CALM TO 2 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...SOUTH WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS...THEN SHOWERS AND THUNDERSTORMS LIKELY
AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.WEDNESDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY MID
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH
EARLY AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING
TO 3 TO 6 FEET.
.WEDNESDAY NIGHT...WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO
3 TO 5 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. A CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$

LSZ267-280945-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
938 PM EDT MON JUL 27 2015

.REST OF TONIGHT...SOUTHEAST WINDS LESS THAN 10 KNOTS INCREASING
TO 5 TO 15 KNOTS AFTER MIDNIGHT. PATCHY FOG. WAVES CALM TO
2 FEET.
.TUESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS
AND THUNDERSTORMS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.WEDNESDAY...SOUTH WINDS 10 TO 20 KNOTS VEERING WEST BY MID
AFTERNOON. SHOWERS AND THUNDERSTORMS LIKELY THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...WEST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. A CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.

$$
LSZ261-280945-
MAFOR 2803/
SUPERIOR WEST 12200 11300 14310 11420. CHANCE OF SHOWERS AND
THUNDERSTORMS TUESDAY MORNING THROUGH LATE TUESDAY EVENING. WAVES 2
FEET OR LESS.

SUPERIOR NORTH CENTRAL 13300 13310 12320. PATCHY FOG OVERNIGHT
THROUGH LATE TUESDAY MORNING. CHANCE OF SHOWERS AND THUNDERSTORMS
LATE TUESDAY EVENING. WAVES 1 TO 3 FEET.

SUPERIOR SOUTH CENTRAL 11300 12400 11300 11310 12320 11420.
CHANCE OF SHOWERS AND THUNDERSTORMS LATE TUESDAY EVENING. WAVES 1
TO 3 FEET.

SUPERIOR EAST 14300 11300 11310 12320. PATCHY FOG OVERNIGHT THROUGH
LATE TUESDAY MORNING. WAVES 2 FEET OR LESS.

$$

JS



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