Great Lakes Forecast
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000
FZUS63 KMQT 181355
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
955 AM EDT THU MAY 18 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...A 29.5 INCH LOW PRESSURE OVER SOUTHERN UPPER MICHIGAN
THIS MORNING WILL MOVE INTO SOUTHWEST QUEBEC LATE TODAY AHEAD OF
A 30.3 INCH HIGH PRESSURE DRIFTING SLOWLY INTO SOUTHERN MANITOBA.
EXPECT THIS HIGH TO SLIDE ACROSS SOUTHERN ONTARIO ON FRIDAY AND
INTO QUEBEC ON SATURDAY. A 29.7 INCH LOW PRESSURE DEVELOPING IN
THE SOUTH CENTRAL PLAINS LATE TONIGHT WILL THEN DRIFT SLOWLY NORTH
INTO THE UPPER MISSISSIPPI RIVER VALLEY ON SATURDAY, WESTERN
ONTARIO ON SUNDAY AND TO NEAR JAMES BAY ON MONDAY, LEAVING A 29.8
INCH LOW PRESSURE TROUGH OVER THE UPPER GREAT LAKES.

LSZ162-182200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
955 AM EDT THU MAY 18 2017 /855 AM CDT THU MAY 18 2017/

...GALE WARNING IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS
MORNING...

.REST OF TODAY...NORTH GALES TO 35 KNOTS DIMINISHING TO NORTH
WINDS 20 TO 30 KNOTS BY THIS AFTERNOON AND BECOMING SOUTHEAST 10
TO 20 KNOTS LATE. SCATTERED RAIN SHOWERS BY LATE MORNING. WAVES 6
TO 9 FEET OCCASIONALLY TO 11 FEET SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER MIDNIGHT.
WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...NORTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO
1 TO 3 FEET.
.SATURDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY. WAVES BUILDING TO
3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES
SUBSIDING TO 2 TO 4 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ263-182200-
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-
955 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...NORTH GALES TO 40 KNOTS DIMINISHING TO 20 TO
30 KNOTS BY MID AFTERNOON. SCATTERED RAIN SHOWERS BY LATE
MORNING. WAVES 8 TO 11 FEET OCCASIONALLY TO 14 FEET SUBSIDING TO
3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO LESS THAN 10
KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF RAIN
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 1 TO 3 FEET.
.SATURDAY...EAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN SHOWERS
THROUGH EARLY AFTERNOON...THEN RAIN SHOWERS LIKELY BY MID
AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...
THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
2 TO 4 FEET.
.SUNDAY...EAST WINDS 10 TO 20 KNOTS VEERING WEST. A CHANCE OF
RAIN SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO
2 TO 4 FEET.
.MONDAY...WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-182200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
955 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...NORTH GALES TO 40 KNOTS DIMINISHING TO NORTH
WINDS 20 TO 30 KNOTS BY MID AFTERNOON. SCATTERED SNOW SHOWERS BY
LATE MORNING. SCATTERED RAIN SHOWERS. WAVES 9 TO 12 FEET
OCCASIONALLY TO 15 FEET SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8
FEET.
.TONIGHT...NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY BY MID AFTERNOON.
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY. WAVES 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING WEST. A CHANCE
OF RAIN SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ265-182200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
955 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...NORTH GALES TO 40 KNOTS. NUMEROUS RAIN SHOWERS
BY LATE MORNING...THEN SCATTERED RAIN SHOWERS BY MID AFTERNOON.
WAVES 9 TO 12 FEET OCCASIONALLY TO 15 FEET SUBSIDING TO 6 TO
9 FEET OCCASIONALLY TO 11 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY BY MID AFTERNOON.
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...
THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
2 TO 4 FEET.
.SUNDAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO
25 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO
2 TO 4 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ266-182200-
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-
955 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...NORTH GALES TO 40 KNOTS. NUMEROUS RAIN SHOWERS
BY LATE MORNING...THEN SCATTERED RAIN SHOWERS BY MID AFTERNOON.
WAVES 9 TO 12 FEET OCCASIONALLY TO 15 FEET SUBSIDING TO 7 TO
10 FEET OCCASIONALLY TO 13 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
.FRIDAY...NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY BY MID AFTERNOON.
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...
THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
2 TO 4 FEET.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO
25 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET...
THEN SUBSIDING TO CALM TO 2 FEET.

$$

LSZ267-182200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
955 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...NORTHEAST GALES TO 40 KNOTS BACKING NORTH BY MID
AFTERNOON. RAIN SHOWERS. WAVES 6 TO 10 FEET OCCASIONALLY TO
13 FEET.
.TONIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. RAIN SHOWERS LIKELY. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.SUNDAY...SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST 10 TO
20 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET...THEN SUBSIDING TO CALM TO 2 FEET.

$$
LSZ261-182200-
MAFOR 1815/
SUPERIOR WEST...GALE WARNING IN EFFECT...11850 11130 11400 11500
12700 11800 11100. SCATTERED RAIN SHOWERS LATE THIS MORNING.
WAVES 6 TO 10 FEET SUBSIDING TO 5 TO 7 FEET THIS AFTERNOON. WAVES
3 TO 6 FEET SUBSIDING TO 2 TO 3 FEET TONIGHT. WAVES 1 TO 2 FEET
FRIDAY MORNING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11856 11850
11820 12810 12800 11100. SCATTERED RAIN AND SNOW SHOWERS EARLY
THIS AFTERNOON. WAVES 8 TO 12 FEET SUBSIDING TO 7 TO 10 FEET THIS
AFTERNOON. WAVES 3 TO 6 FEET SUBSIDING TO 1 TO 3 FEET TONIGHT.
WAVES AROUND 1 FOOT FRIDAY MORNING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11856 11850
11840 11820 11810 12800 11100. WAVES 9 TO 12 FEET THIS AFTERNOON.
WAVES 7 TO 10 FEET SUBSIDING TO 2 TO 4 FEET TONIGHT. WAVES 1 TO 2
FEET FRIDAY MORNING.

SUPERIOR EAST...GALE WARNING IN EFFECT...11156 11856 11850 11830
11820 13810. SCATTERED RAIN SHOWERS LATE THIS AFTERNOON. WAVES 7
TO 10 FEET THIS AFTERNOON. WAVES 5 TO 8 FEET SUBSIDING TO 1 TO 3
FEET TONIGHT. WAVES 1 TO 2 FEET FRIDAY MORNING.

$$

JLB

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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