Great Lakes Forecast
Issued by NWS

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FZUS63 KMQT 212003
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
403 PM EDT WED SEP 21 2016

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A HIGH PRESSURE RIDGE AVERAGING 30.2 INCHES AND
STRETCHING FROM THE NORTHEAST STATES INTO SOUTH CENTRAL CANADA WILL
WEAKEN OVER THE LOWER GREAT LAKES TONIGHT AS A LOW PRESSURE TROUGH
AVERAGING 30.0 INCHES EXTENDS FROM NEBRASKA TO NORTHERN LAKE
MICHIGAN. AS A 30.4 INCH HIGH PRESSURE BUILDS OVER SOUTH CENTRAL
CANADA ON THURSDAY...THIS TROUGH WILL MIGRATES SLOWLY SOUTH INTO THE
LOWER GREAT LAKES BY FRIDAY. EXPECT THE CANADIAN HIGH PRESSURE TO
DRIFT SLOWLY EAST THROUGH NORTHWEST ONTARIO ON SATURDAY AND TOWARD
FAR WESTERN QUEBEC ON SUNDAY WHILE A 29.7 INCH LOW PRESSURE IN THE
NORTHERN PLAINS LIFTS NORTHEAST TO NEAR LAKE WINNIPEG AND WEAKENS TO
29.9 INCHES. AN ASSOCIATED 29.8 TROUGH MOVES INTO WESTERN LAKE
SUPERIOR ON SUNDAY.

LSZ162-220415-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
403 PM EDT WED SEP 21 2016 /303 PM CDT WED SEP 21 2016/

.LATE THIS AFTERNOON...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST AFTER
MIDNIGHT. A CHANCE OF SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS
AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...EAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO
5 FEET.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO 1 TO 3 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES 1 TO 3 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS VEERING SOUTH. SHOWERS
LIKELY...THEN A CHANCE OF SHOWERS. WAVES 1 TO 3 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ263-220415-
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 PM EDT WED SEP 21 2016

.LATE THIS AFTERNOON...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. A
SLIGHT CHANCE OF THUNDERSTORMS AFTER MIDNIGHT. WAVES BUILDING TO
2 TO 4 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
BY MID AFTERNOON. WAVES 2 TO 4 FEET.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.SATURDAY...SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST BY MID
AFTERNOON. A CHANCE OF SHOWERS. WAVES 1 TO 3 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF
SHOWERS. WAVES 1 TO 3 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS VEERING SOUTH. A CHANCE
OF SHOWERS...THEN SHOWERS LIKELY. WAVES BUILDING TO 3 TO 5 FEET...
THEN SUBSIDING TO 2 TO 4 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-220415-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
403 PM EDT WED SEP 21 2016

.LATE THIS AFTERNOON...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS. WAVES CALM
TO 2 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS THROUGH EARLY AFTERNOON. WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
1 TO 3 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING
TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SHOWERS...THEN SHOWERS LIKELY. WAVES
BUILDING TO 3 TO 5 FEET.
.MONDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO
20 KNOTS. SHOWERS LIKELY...THEN A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ265-220415-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
403 PM EDT WED SEP 21 2016

.LATE THIS AFTERNOON...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO
2 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY...EAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 2 TO
4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING
TO 1 TO 3 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SHOWERS...THEN SHOWERS LIKELY. WAVES
BUILDING TO 3 TO 5 FEET.
.MONDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ266-220415-
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 PM EDT WED SEP 21 2016

.LATE THIS AFTERNOON...NORTHEAST WINDS 5 TO 15 KNOTS. A SLIGHT
CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
.TONIGHT...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO
2 FEET.
.THURSDAY...NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 15 TO 25 KNOTS VEERING EAST
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
BY MID AFTERNOON. WAVES 1 TO 3 FEET.
.FRIDAY NIGHT...EAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.SATURDAY...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING
TO 1 TO 3 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET.
.MONDAY...SOUTHEAST WINDS 15 TO 25 KNOTS VEERING SOUTH. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ267-220415-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
403 PM EDT WED SEP 21 2016

.LATE THIS AFTERNOON...NORTH WINDS 10 TO 20 KNOTS. A SLIGHT
CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
.THURSDAY...EAST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM TO
2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY...EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.
.MONDAY...SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH 15 TO
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET...
THEN SUBSIDING TO CALM TO 2 FEET.

$$

LSZ261-220415-
MAFOR 2121/
SUPERIOR WEST 11210 14220 13120. CHANCE OF SHOWERS FROM LATE
EVENING ON TONIGHT. WAVES 1 TO 4 FEET.

SUPERIOR NORTH CENTRAL 11100 11200 11100 11110 11210 11120 12110.
CHANCE OF SHOWERS LATE TONIGHT. WAVES 2 FEET OR LESS.

SUPERIOR SOUTH CENTRAL 11100 12200 14110 11110. CHANCE OF SHOWERS
FROM LATE EVENING ON TONIGHT. CHANCE OF SHOWERS THROUGH EARLY
AFTERNOON THURSDAY. WAVES 1 TO 2 FEET.

SUPERIOR EAST 12800 12100 11110 11210 12110. CHANCE OF SHOWERS
LATE TONIGHT. CHANCE OF SHOWERS THURSDAY MORNING. WAVES 1 TO 2
FEET.

$$

JS



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