Great Lakes Forecast
Issued by NWS

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197
FZUS63 KMQT 201352
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
952 AM EDT MON MAR 20 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A 29.9 INCH TROUGH WILL CROSS THE LOWER GREAT LAKES
TODAY AS A 30.3 INCH HIGH PRESSURE RIDGE MOVES INTO THE NORTHERN
PLAINS. ANOTHER 29.9 INCH TROUGH WILL MOVE ACROSS THE UPPER GREAT
LAKES TONIGHT. A 30.7 INCH HIGH PRESSURE WEST OF LAKE WINNIPEG
TUESDAY MORNING WILL DRIFT ACROSS THE UPPER GREAT LAKES ON
WEDNESDAY BEFORE REACHING THE EAST COAST ON THURSDAY AS A 29.4
INCH LOW PRESSURE ORGANIZES OVER THE WESTERN PLAINS. BY FRIDAY
AFTERNOON...THIS LOW WILL MOVE INTO THE CENTRAL PLAINS AND WEAKEN
TO 29.5 INCHES AS 30.5 INCH HIGH PRESSURE IS ACROSS NORTHERN
ONTARIO.

LSZ162-202200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
952 AM EDT MON MAR 20 2017 /852 AM CDT MON MAR 20 2017/

.REST OF TODAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST
BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
5 TO 15 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS
THROUGH MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET...THEN SUBSIDING
TO CALM TO 2 FEET.
.WEDNESDAY...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.THURSDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. RAIN SHOWERS LIKELY. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO
25 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO 3
TO 6 FEET.

$$

LSZ263-202200-
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-
952 AM EDT MON MAR 20 2017

.REST OF TODAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST BY
MID AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET.
.TUESDAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 3 TO 6 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF
SNOW SHOWERS. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO
1 TO 3 FEET.
.WEDNESDAY...NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST BY
MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO
3 TO 6 FEET.

$$

LSZ264-202200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
952 AM EDT MON MAR 20 2017

.REST OF TODAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST BY
MID AFTERNOON. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET.
.TUESDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. FREEZING SPRAY. A SLIGHT CHANCE OF
SNOW SHOWERS. WAVES BUILDING TO 5 TO 8 FEET...THEN SUBSIDING TO
3 TO 6 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS. FREEZING SPRAY
THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO
1 TO 3 FEET.
.WEDNESDAY...NORTH WINDS 5 TO 15 KNOTS BACKING WEST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW.
WAVES BUILDING TO 3 TO 5 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO 4
TO 7 FEET.

$$

LSZ265-202200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
952 AM EDT MON MAR 20 2017

.REST OF TODAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST
5 TO 15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS TO
35 KNOTS IN THE MORNING. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS.
WAVES BUILDING TO 4 TO 7 FEET...THEN SUBSIDING TO 3 TO 6 FEET.
.TUESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS. FREEZING SPRAY
THROUGH MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO
2 TO 4 FEET.
.WEDNESDAY...NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.THURSDAY...SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS...THEN
A CHANCE OF SNOW SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES
BUILDING TO 4 TO 7 FEET.

$$

LSZ266-202200-
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-
952 AM EDT MON MAR 20 2017

.REST OF TODAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO
5 TO 15 KNOTS BY MID AFTERNOON. WAVES 1 TO 3 FEET.
.TONIGHT...WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS TO
35 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES BUILDING
TO 4 TO 8 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS.
WAVES SUBSIDING TO 3 TO 5 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY...SOUTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. RAIN SHOWERS AND SNOW SHOWERS LIKELY. WAVES BUILDING TO
3 TO 6 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.FRIDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW SHOWERS...THEN
A CHANCE OF SNOW SHOWERS...POSSIBLY MIXED WITH RAIN. WAVES
BUILDING TO 4 TO 7 FEET.

$$

LSZ267-202200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
952 AM EDT MON MAR 20 2017

.REST OF TODAY...NORTHWEST WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET.
.TUESDAY...NORTH WINDS 20 TO 30 KNOTS. A FEW GALE FORCE GUSTS TO
35 KNOTS. FREEZING SPRAY. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 4 TO 8 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET.
.WEDNESDAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
.THURSDAY...SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN AND SNOW
SHOWERS. WAVES BUILDING TO 3 TO 5 FEET...THEN SUBSIDING TO 1 TO
3 FEET.
.FRIDAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS. SNOW SHOWERS...POSSIBLY MIXED WITH RAIN SHOWERS. WAVES
BUILDING TO 3 TO 6 FEET.

$$
LSZ261-202200-
MAFOR 2015/
SUPERIOR WEST 11710 11610 12510 11530 12740 11830. WAVES 1 TO 5
FEET.

SUPERIOR NORTH CENTRAL 11720 11610 12520 11530 11640 11740 11850.
WAVES 1 TO 3 FEET THIS AFTERNOON. WAVES 1 TO 5 FEET BUILDING TO 5
TO 8 FEET TUESDAY MORNING.

SUPERIOR SOUTH CENTRAL 11720 11710 12610 11520 11630 11740 11751.
WAVES 1 TO 4 FEET BUILDING TO 4 TO 7 FEET.

SUPERIOR EAST 13720 11610 11520 11630 11740 11751. WAVES 2 TO 7
FEET.

$$

PETRO



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