Great Lakes Forecast
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000
FZUS63 KMQT 180749
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
349 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 NORTHEAST WISCONSIN EARLY
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.

LSZ162-181600-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
349 AM EDT THU MAY 18 2017 /249 AM CDT THU MAY 18 2017/

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

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS.
WAVES 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
.TODAY...NORTH GALES TO 35 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. SCATTERED RAIN SHOWERS THROUGH EARLY
AFTERNOON. WAVES 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.

$$

LSZ263-181600-
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-
349 AM EDT THU MAY 18 2017

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

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS.
WAVES 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
.TODAY...NORTH GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS BY
MID AFTERNOON. SCATTERED RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TONIGHT...NORTH WINDS 5 TO 15 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.

$$

LSZ264-181600-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
349 AM EDT THU MAY 18 2017

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

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. RAIN SHOWERS.
WAVES 8 TO 11 FEET OCCASIONALLY TO 14 FEET BUILDING TO 9 TO
12 FEET OCCASIONALLY TO 15 FEET.
.TODAY...NORTH GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS BY
MID AFTERNOON. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS
THROUGH EARLY AFTERNOON...THEN ISOLATED RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18
FEET...THEN 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.

$$

LSZ265-181600-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
349 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...NORTH GALES TO 40 KNOTS. PATCHY FOG. RAIN
SHOWERS. WAVES 7 TO 11 FEET OCCASIONALLY TO 13 FEET.
.TODAY...NORTH GALES TO 40 KNOTS. NUMEROUS RAIN SHOWERS THROUGH
EARLY AFTERNOON...THEN SCATTERED RAIN SHOWERS BY MID AFTERNOON.
WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET...THEN
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.

$$

LSZ266-181600-
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-
349 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...NORTHEAST GALES TO 40 KNOTS. PATCHY FOG.
SCATTERED RAIN SHOWERS. WAVES 7 TO 10 FEET OCCASIONALLY TO
13 FEET BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.TODAY...NORTH GALES TO 40 KNOTS. NUMEROUS RAIN SHOWERS THROUGH
EARLY AFTERNOON...THEN SCATTERED RAIN SHOWERS BY MID AFTERNOON.
WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET...THEN
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.

$$

LSZ267-181600-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
349 AM EDT THU MAY 18 2017

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS
EVENING...

.EARLY THIS MORNING...SOUTHEAST WINDS 15 TO 25 KNOTS. PATCHY FOG.
SCATTERED RAIN SHOWERS AND ISOLATED THUNDERSTORMS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
.TODAY...NORTHEAST GALES TO 40 KNOTS BACKING NORTH BY MID
AFTERNOON. RAIN SHOWERS. WAVES BUILDING TO 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.

$$

LSZ261-181600-
MAFOR 1809/
SUPERIOR WEST...GALE WARNING IN EFFECT...11156 11856 11850 11130
11400 11500 12700. SCATTERED RAIN SHOWERS LATE THIS MORNING.
WAVES 6 TO 10 FEET SUBSIDING TO 5 TO 7 FEET TODAY. WAVES 3 TO 6
FEET SUBSIDING TO 2 TO 3 FEET TONIGHT.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11166 11866
11856 11850 11820 12810 11800. SCATTERED RAIN AND SNOW SHOWERS
EARLY THIS AFTERNOON. WAVES 8 TO 12 FEET SUBSIDING TO 7 TO 10
FEET TODAY. WAVES 3 TO 6 FEET SUBSIDING TO 1 TO 3 FEET TONIGHT.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11156 12856
11850 11840 11820 11810 11800. PATCHY FOG EARLY THIS MORNING.
WAVES 6 TO 9 FEET BUILDING TO 8 TO 12 FEET TODAY. WAVES 7 TO 10
FEET SUBSIDING TO 2 TO 4 FEET TONIGHT.

SUPERIOR EAST...GALE WARNING IN EFFECT...12150 11156 11856 11850
11830 11820 11810. SCATTERED RAIN SHOWERS THIS MORNING. SCATTERED
RAIN SHOWERS LATE TODAY. WAVES 5 TO 9 FEET BUILDING TO 7 TO 10
FEET TODAY. WAVES 5 TO 8 FEET SUBSIDING TO 2 TO 4 FEET TONIGHT.

$$

TITUS

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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