Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 201500
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1000 AM EST MON FEB 20 2017

.SYNOPSIS...A 30.2 INCH HIGH PRESSURE RIDGE EXTENDING FROM JAMES
BAY TO THE OHIO VALLEY WILL SHIFT EAST...REACHING THE EAST COAST
TONIGHT. MEANWHILE...A 29.5 INCH LOW PRESSURE OVER THE DAKOTAS
WILL DEEPEN TO 29.1 INCHES AS IT LIFTS TO FAR NORTHERN ONTARIO BY
TUESDAY MORNING...THEN TO JAMES BAY TUESDAY NIGHT. THIS LOW WILL
DRIVE A 29.6 INCH TROUGH ACROSS LAKE SUPERIOR TONIGHT. ANOTHER LOW
PRESSURE OF 29.6 INCHES TRACKING EAST ACROSS THE DAKOTAS TUESDAY
NIGHT WILL CROSS THE UPPER GREAT LAKES ON WEDNESDAY AND REACH
QUEBEC THURSDAY. IN ITS WAKE...A 30.0 INCH HIGH PRESSURE RIDGE
WILL BUILD SOUTHEAST INTO THE UPPER GREAT LAKES THURSDAY AS LOW
PRESSURE OF 29.2 INCHES ORGANIZES OVER THE CENTRAL PLAINS. THIS
LOW WILL TRACK NORTHEAST...REACHING LAKE MICHIGAN FRIDAY EVENING.

LSZ162-202300-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1000 AM EST MON FEB 20 2017 /900 AM CST MON FEB 20 2017/

.REST OF TODAY...EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST IN
THE AFTERNOON. A CHANCE OF RAIN SHOWERS THROUGH NOON...THEN RAIN
SHOWERS IN THE AFTERNOON. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5
FEET.
.TONIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY IN THE EVENING.
WAVES 3 TO 5 FEET.
.TUESDAY...SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE
MORNING...THEN RAIN SHOWERS LIKELY IN THE AFTERNOON. WAVES CALM
TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN
AND SNOW SHOWERS. WAVES CALM TO 2 FEET.
.THURSDAY...NORTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH. A CHANCE
OF SNOW SHOWERS. FREEZING SPRAY. WAVES BUILDING TO 6 TO 9 FEET...
THEN SUBSIDING TO 4 TO 7 FEET.

$$

LSZ263-202300-
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-
1000 AM EST MON FEB 20 2017

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE
OF RAIN SHOWERS THROUGH NOON...THEN RAIN SHOWERS IN THE
AFTERNOON. WAVES 3 TO 6 FEET BUILDING TO 7 TO 10 FEET.
.TONIGHT...SOUTH WINDS 20 TO 30 KNOTS BECOMING WEST 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS IN THE EVENING...THEN A
SLIGHT CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
3 TO 6 FEET.
.TUESDAY...WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST IN THE
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
.TUESDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE
MORNING. A CHANCE OF SNOW SHOWERS. RAIN SHOWERS...POSSIBLY MIXED
WITH SLEET IN THE AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS AND SNOW SHOWERS LIKELY...
POSSIBLY MIXED WITH SLEET IN THE EVENING...THEN A CHANCE OF SNOW
SHOWERS...POSSIBLY MIXED WITH RAIN AFTER MIDNIGHT. WAVES BUILDING
TO 1 TO 3 FEET.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST.
WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW
SHOWERS...THEN SNOW SHOWERS LIKELY. FREEZING SPRAY. WAVES
BUILDING TO 5 TO 9 FEET.

$$

LSZ264-202300-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1000 AM EST MON FEB 20 2017

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.REST OF TODAY...SOUTHEAST GALES TO 40 KNOTS. A CHANCE OF RAIN
SHOWERS IN THE AFTERNOON. WAVES 4 TO 7 FEET BUILDING TO 8 TO
11 FEET.
.TONIGHT...SOUTH GALES TO 40 KNOTS BECOMING WEST 20 TO 30 KNOTS
AFTER MIDNIGHT. RAIN SHOWERS. WAVES SUBSIDING TO 4 TO 7 FEET.
.TUESDAY...WEST WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST
5 TO 15 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS IN
THE EVENING. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
AND SLEET. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS. RAIN SHOWERS AND
SNOW SHOWERS LIKELY IN THE EVENING...THEN A CHANCE OF SNOW
SHOWERS...POSSIBLY MIXED WITH RAIN AFTER MIDNIGHT. WAVES BUILDING
TO 2 TO 4 FEET.
.THURSDAY...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS...THEN SNOW SHOWERS LIKELY.
FREEZING SPRAY. WAVES BUILDING TO 6 TO 9 FEET.

$$

LSZ265-202300-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1000 AM EST MON FEB 20 2017

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...SOUTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS IN THE AFTERNOON. RAIN SHOWERS LIKELY IN THE
AFTERNOON. WAVES 3 TO 6 FEET BUILDING TO 5 TO 8 FEET.
.TONIGHT...SOUTH GALES TO 35 KNOTS BECOMING WEST 15 TO 25 KNOTS
AFTER MIDNIGHT. RAIN SHOWERS. WAVES BUILDING TO 6 TO 9 FEET...THEN
SUBSIDING TO 3 TO 5 FEET.
.TUESDAY...WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS VEERING WEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...WEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST IN THE
AFTERNOON. RAIN SHOWERS LIKELY IN THE AFTERNOON. WAVES CALM TO
2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
SHOWERS AND SLEET IN THE EVENING...THEN A CHANCE OF RAIN AND SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST
10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING
TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS...THEN SNOW SHOWERS. FREEZING
SPRAY. WAVES BUILDING TO 7 TO 10 FEET.

$$

LSZ266-202300-
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-
1000 AM EST MON FEB 20 2017

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...SOUTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS IN
THE AFTERNOON. WAVES 4 TO 7 FEET BUILDING TO 8 TO 11 FEET.
.TONIGHT...SOUTH GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS
AFTER MIDNIGHT. RAIN SHOWERS. WAVES SUBSIDING TO 4 TO 7 FEET.
.TUESDAY...WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST IN THE
AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS EARLY IN THE MORNING.
WAVES SUBSIDING TO 2 TO 4 FEET.
.TUESDAY NIGHT...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
SHOWERS AND SLEET IN THE EVENING...THEN A CHANCE OF RAIN AND SNOW
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO
2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS...THEN SNOW SHOWERS. FREEZING
SPRAY. WAVES BUILDING TO 7 TO 10 FEET.

$$

LSZ267-202300-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1000 AM EST MON FEB 20 2017

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO
GALES TO 35 KNOTS IN THE AFTERNOON. WAVES 3 TO 5 FEET BUILDING TO
5 TO 8 FEET.
.TONIGHT...SOUTHEAST GALES TO 40 KNOTS BECOMING SOUTH GALES TO
35 KNOTS AFTER MIDNIGHT. RAIN SHOWERS. WAVES BUILDING TO 6 TO
9 FEET...THEN SUBSIDING TO 3 TO 5 FEET.
.TUESDAY...WEST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF RAIN
SHOWERS EARLY IN THE MORNING. WAVES SUBSIDING TO 2 TO 4
FEET...THEN BUILDING TO 3 TO 5 FEET.
.TUESDAY NIGHT...SOUTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE
AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY IN THE
EVENING...THEN A CHANCE OF RAIN AND SNOW SHOWERS...POSSIBLY MIXED
WITH SLEET AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO
1 TO 3 FEET.
.FRIDAY...EAST WINDS 20 TO 30 KNOTS BACKING NORTHEAST. A CHANCE
OF SNOW SHOWERS...THEN SNOW SHOWERS. WAVES BUILDING TO 4 TO
7 FEET.

$$
LSZ261-202300-
MAFOR 2016/
SUPERIOR WEST 11220 12226 11426 11530 13630. CHANCE OF RAIN
SHOWERS EARLY THIS AFTERNOON AND AFTER MIDNIGHT TONIGHT. WAVES 2
TO 5 FEET.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...12350 12356
11456 11540 12630. CHANCE OF RAIN SHOWERS LATE THIS AFTERNOON AND
TONIGHT. WAVES 6 TO 10 FEET BUILDING TO 8 TO 11 FEET THIS
AFTERNOON. WAVES 7 TO 11 FEET SUBSIDING TO 5 TO 8 FEET TONIGHT.
WAVES 4 TO 7 FEET TUESDAY MORNING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...12340 11356
12456 11546 12630. CHANCE OF RAIN SHOWERS LATE THIS AFTERNOON AND
TONIGHT. WAVES 2 TO 7 FEET.

SUPERIOR EAST...GALE WARNING IN EFFECT...12340 11350 12356 11456
11530 11630. CHANCE OF RAIN SHOWERS THROUGH EARLY EVENING
TONIGHT. WAVES 5 TO 8 FEET THIS AFTERNOON. WAVES 6 TO 10 FEET
SUBSIDING TO 3 TO 7 FEET TONIGHT AND TUESDAY MORNING.

$$

PETRO



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