Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 171349
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
949 AM EDT FRI MAR 17 2017

.SYNOPSIS...A 29.6 INCH LOW PRESSURE SYSTEM OVER SOUTHERN
MANITOBA WILL TRACK EAST...REACHING NORTHERN ONTARIO THIS
AFTERNOON. AS THIS LOW SLIDES SOUTHEAST ACROSS THE GREAT LAKES
REGION TONIGHT AND SATURDAY MORNING AND THEN OFF THE EAST COAST
LATE SATURDAY...A 30.4 INCH HIGH PRESSURE WILL BUILD INTO NORTHERN
ONTARIO AND WILL EXTEND A RIDGE TO THE MID MISSISSIPPI RIVER
VALLEY. EXPECT THIS RIDGE TO SLIDE TO THE EAST AND STRETCH FROM
QUEBEC TO THE GULF COAST BY LATE SUNDAY. A 29.0 INCH LOW PRESSURE
OVER NORTHERN MANITOBA SUNDAY MORNING WILL THEN TRACK
EAST...CROSSING HUDSON BAY SUNDAY NIGHT AND MONDAY WHILE DRAGGING
A COLD FRONT ACROSS THE UPPER GREAT LAKES ON SUNDAY NIGHT. IN ITS
WAKE...HIGH PRESSURE OF 30.5 INCHES BUILDING SOUTHEAST INTO
SASKATCHEWAN ON MONDAY WILL MOVE TO MANITOBA ON TUESDAY WITH A
RIDGE EXTENDING INTO THE UPPER MISSISSIPPI VALLEY.

LSZ162-172200-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
949 AM EDT FRI MAR 17 2017 /849 AM CDT FRI MAR 17 2017/

.REST OF TODAY...SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST BY
MID AFTERNOON. RAIN...POSSIBLY MIXED WITH SNOW THROUGH LATE
MORNING...THEN A CHANCE OF RAIN...POSSIBLY MIXED WITH SNOW. WAVES
1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW AND AREAS OF DRIZZLE.
WAVES BUILDING TO 2 TO 4 FEET.
.SATURDAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.SUNDAY...SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.SUNDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST. WAVES
BUILDING TO 2 TO 4 FEET.
.TUESDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.

$$

LSZ263-172200-
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-
949 AM EDT FRI MAR 17 2017

.REST OF TODAY...SOUTH WINDS 5 TO 15 KNOTS. RAIN...POSSIBLY MIXED
WITH SNOW. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW AND AREAS OF DRIZZLE.
WAVES 2 TO 4 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF DRIZZLE...FREEZING
DRIZZLE AND SNOW THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO CALM
TO 2 FEET.
.SATURDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.SUNDAY...SOUTH WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
.SUNDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER
MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES 1 TO 3 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
BUILDING TO 3 TO 5 FEET.
.TUESDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-172200-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
949 AM EDT FRI MAR 17 2017

.REST OF TODAY...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN AND
SNOW BY LATE MORNING...THEN RAIN AND SNOW BY MID AFTERNOON. WAVES
3 TO 6 FEET BUILDING TO 4 TO 7 FEET.
.TONIGHT...SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH AFTER
MIDNIGHT. SNOW LIKELY AND AREAS OF DRIZZLE THROUGH MIDNIGHT...
THEN A CHANCE OF SNOW AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO
3 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF DRIZZLE AND SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF FREEZING DRIZZLE. WAVES BUILDING TO
2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET.
.SUNDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF
SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. A CHANCE
OF SNOW SHOWERS. WAVES BUILDING TO 3 TO 6 FEET.
.TUESDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. A CHANCE
OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.

$$

LSZ265-172200-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
949 AM EDT FRI MAR 17 2017

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
AND SNOW BY LATE MORNING...THEN RAIN AND SNOW BY MID AFTERNOON.
WAVES 3 TO 6 FEET.
.TONIGHT...SOUTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW. WAVES SUBSIDING TO
CALM TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 10 TO 20 KNOTS. A CHANCE OF DRIZZLE
THROUGH EARLY AFTERNOON. A CHANCE OF FREEZING DRIZZLE. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET.
.SUNDAY NIGHT...SOUTH WINDS 15 TO 25 KNOTS VEERING WEST AFTER
MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 3 TO
6 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 3 TO 6 FEET.

$$

LSZ266-172200-
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-
949 AM EDT FRI MAR 17 2017

.REST OF TODAY...SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHEAST
15 TO 25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN AND SNOW BY
LATE MORNING...THEN RAIN AND SNOW LIKELY BY MID AFTERNOON. WAVES
4 TO 7 FEET SUBSIDING TO 3 TO 6 FEET.
.TONIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. SNOW LIKELY THROUGH MIDNIGHT...THEN A
CHANCE OF SNOW AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF DRIZZLE. A SLIGHT CHANCE OF FREEZING
DRIZZLE BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET...
THEN BUILDING TO 2 TO 4 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET.
.SUNDAY NIGHT...SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES
SUBSIDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS VEERING NORTHWEST. FREEZING
SPRAY. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 4 TO 7 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS. FREEZING SPRAY. A
CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 5 TO 8 FEET...THEN
SUBSIDING TO 3 TO 5 FEET.

$$

LSZ267-172200-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
949 AM EDT FRI MAR 17 2017

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
AND SNOW BY MID AFTERNOON. WAVES 2 TO 4 FEET BUILDING TO 3 TO
5 FEET.
.TONIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. SNOW. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS BACKING NORTH BY MID
AFTERNOON. A SLIGHT CHANCE OF FREEZING DRIZZLE THROUGH EARLY
AFTERNOON. A CHANCE OF SNOW AND DRIZZLE. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST
AFTER MIDNIGHT. A SLIGHT CHANCE OF FREEZING RAIN THROUGH
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET...THEN SUBSIDING TO CALM
TO 2 FEET.
.SUNDAY...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 15 TO 25 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SUNDAY NIGHT...SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 3 TO 5 FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS. FREEZING SPRAY. WAVES
SUBSIDING TO 1 TO 3 FEET...THEN BUILDING TO 4 TO 7 FEET.
.TUESDAY...NORTHWEST WINDS 20 TO 30 KNOTS VEERING NORTH. FREEZING
SPRAY. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET.

$$
LSZ261-172200-
MAFOR 1715/
SUPERIOR WEST 11426 11410 11510 11625 11620 13730. CHANCE OF RAIN
LATE THIS AFTERNOON. CHANCE OF RAIN AND SNOW THROUGH EARLY
EVENING...THEN CHANCE OF SNOW LATE THIS EVENING. WAVES 1 TO 4
FEET.

SUPERIOR NORTH CENTRAL 11440 11347 11337 11427 11410 11600 11820
11830. CHANCE OF RAIN AND SNOW LATE THIS MORNING. CHANCE OF SNOW
OVERNIGHT. CHANCE OF SNOW THROUGH MID MORNING SATURDAY...THEN
CHANCE OF LIGHT FREEZING DRIZZLE AND SNOW LATE SATURDAY MORNING.
WAVES 2 TO 6 FEET.

SUPERIOR SOUTH CENTRAL 11330 12337 11320 11410 11500 11710 11720.
CHANCE OF RAIN AND SNOW LATE THIS MORNING. CHANCE OF SNOW FROM
LATE EVENING ON TONIGHT. CHANCE OF SNOW THROUGH MID MORNING
SATURDAY...THEN CHANCE OF DRIZZLE AND LIGHT FREEZING DRIZZLE LATE
SATURDAY MORNING. WAVES 1 TO 5 FEET.

SUPERIOR EAST 12330 13337 11327 11310 11200. CHANCE OF RAIN AND
SNOW LATE THIS AFTERNOON. CHANCE OF SNOW LATE TONIGHT AND
SATURDAY MORNING. WAVES 1 TO 5 FEET.

$$

PETRO



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