Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 231517
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1017 AM EST THU FEB 23 2017

.SYNOPSIS...AS A 29.5 INCH LOW PRESSURE CENTERED OVER GEORGIAN BAY
THIS MORNING MOVES TOWARD THE CANADIAN MARITIMES BY LATE
TODAY...A 30.4 INCH HIGH PRESSURE RIDGE WILL BUILD OVER NORTHERN
MANITOBA AND EXTEND A WEAK RIDGE AXIS AVERAGING 30.0 INCHES INTO
THE UPPER GREAT LAKES. MEANWHILE...A 29.2 INCH LOW PRESSURE
DEVELOPING IN THE CENTRAL PLAINS TODAY WILL MOVE NORTHEAST AND
ACROSS LOWER MICHIGAN ON FRIDAY NIGHT AND INTO WESTERN QUEBEC BY
LATE SATURDAY WHILE DEEPENING TO 29.1 INCHES. IN ITS WAKE...EXPECT
A 30.3 INCH HIGH PRESSURE ACROSS THE SOUTHERN PLAINS ON SATURDAY
TO DRIFT INTO THE SOUTHEAST STATES ON SUNDAY...EXTENDING A 29.9
INCH RIDGE AXIS INTO THE UPPER LAKES ON SATURDAY NIGHT. A QUICK
MOVING 29.8 INCH LOW PRESSURE SYSTEM WILL THEN MOVE NEAR LAKE
SUPERIOR ON SUNDAY. A 30.2 INCH HIGH PRESSURE WILL FOLLOW ACROSS
THE GREAT LAKES ON MONDAY.

LSZ162-232330-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1017 AM EST THU FEB 23 2017 /917 AM CST THU FEB 23 2017/

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS IN THE AFTERNOON. WAVES 1 TO 3 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT.
WAVES BUILDING TO 3 TO 6 FEET.
.FRIDAY...NORTHEAST GALES TO 35 KNOTS. FREEZING SPRAY. A CHANCE
OF SNOW. WAVES BUILDING TO 7 TO 10 FEET.
.FRIDAY NIGHT...NORTH GALES TO 35 KNOTS. FREEZING SPRAY. SNOW
LIKELY IN THE EVENING. A CHANCE OF SNOW AFTER MIDNIGHT. WAVES
SUBSIDING TO 4 TO 7 FEET.
.SATURDAY...NORTH WINDS 20 TO 30 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW. WAVES
SUBSIDING TO 3 TO 6 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS BACKING WEST
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
.SUNDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO
2 FEET.
.MONDAY...SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS.
A CHANCE OF SNOW SHOWERS. WAVES CALM TO 2 FEET.

$$

LSZ263-232330-
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-
1017 AM EST THU FEB 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS IN THE AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT.
WAVES BUILDING TO 3 TO 6 FEET.
.FRIDAY...NORTHEAST GALES TO 40 KNOTS. FREEZING SPRAY. A CHANCE
OF SNOW IN THE MORNING. SNOW LIKELY IN THE AFTERNOON. WAVES
BUILDING TO 7 TO 10 FEET.
.FRIDAY NIGHT...NORTH GALES TO 35 KNOTS. FREEZING SPRAY. SNOW.
WAVES SUBSIDING TO 5 TO 8 FEET.
.SATURDAY...NORTH WINDS 20 TO 30 KNOTS WITH A FEW GALE FORCE GUSTS
TO 35 KNOTS EARLY...BACKING NORTHWEST IN THE AFTERNOON. FREEZING
SPRAY. A CHANCE OF SNOW. WAVES BUILDING TO 6 TO 9 FEET...THEN
SUBSIDING TO 4 TO 7 FEET.
.SATURDAY NIGHT...NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST
15 TO 25 KNOTS AFTER MIDNIGHT. FREEZING SPRAY IN THE EVENING. A
CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.MONDAY...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS.
WAVES CALM TO 2 FEET.

$$

LSZ264-232330-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1017 AM EST THU FEB 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY
EVENING...

.REST OF TODAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS IN THE AFTERNOON. WAVES 3 TO 5 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT.
WAVES BUILDING TO 3 TO 5 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
40 KNOTS IN THE AFTERNOON. FREEZING SPRAY. A CHANCE OF SNOW IN
THE MORNING. SNOW LIKELY IN THE AFTERNOON. WAVES BUILDING TO 6 TO
9 FEET.
.FRIDAY NIGHT...NORTHEAST GALES TO 40 KNOTS BECOMING NORTH GALES
TO 35 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. SNOW. WAVES 6 TO
9 FEET.
.SATURDAY...NORTH GALES TO 35 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. FREEZING SPRAY. SNOW LIKELY IN THE MORNING. A CHANCE
OF SNOW IN THE AFTERNOON. WAVES BUILDING TO 6 TO 10 FEET.
.SATURDAY NIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO
20 TO 30 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST. SNOW
SHOWERS LIKELY...THEN A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING
TO CALM TO 2 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO
25 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 1 TO
3 FEET.

$$

LSZ265-232330-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1017 AM EST THU FEB 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY
EVENING...

.REST OF TODAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS IN THE AFTERNOON. WAVES 3 TO 5 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT.
WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SNOW IN THE
MORNING...THEN SNOW IN THE AFTERNOON. FREEZING SPRAY IN THE
AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET.
.FRIDAY NIGHT...NORTHEAST GALES TO 35 KNOTS BACKING NORTH AFTER
MIDNIGHT. SNOW. FREEZING SPRAY AFTER MIDNIGHT. WAVES BUILDING TO
6 TO 9 FEET.
.SATURDAY...NORTH GALES TO 40 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. FREEZING SPRAY. SNOW. WAVES BUILDING TO 6 TO 10 FEET.
.SATURDAY NIGHT...NORTHWEST GALES TO 35 KNOTS BECOMING WEST 20 TO
30 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. SNOW SHOWERS LIKELY IN
THE EVENING. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES
SUBSIDING TO 3 TO 5 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST. SNOW
SHOWERS LIKELY. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING
TO 1 TO 3 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO
25 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 1 TO
3 FEET.

$$

LSZ266-232330-
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-
1017 AM EST THU FEB 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY
EVENING...

.REST OF TODAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN
THE AFTERNOON. WAVES 3 TO 6 FEET SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...NORTH WINDS 15 TO 25 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
40 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW IN THE MORNING...THEN
SNOW LIKELY IN THE AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET.
.FRIDAY NIGHT...NORTHEAST GALES TO 35 KNOTS BACKING NORTH AFTER
MIDNIGHT. SNOW...POSSIBLY MIXED WITH FREEZING RAIN. FREEZING
SPRAY AFTER MIDNIGHT. WAVES 6 TO 9 FEET.
.SATURDAY...NORTH GALES TO 40 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. FREEZING SPRAY. SNOW. WAVES BUILDING TO 9 TO 12 FEET.
.SATURDAY NIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO
20 TO 30 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. SNOW SHOWERS
LIKELY IN THE EVENING. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO 4 TO 7 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST. SNOW
SHOWERS LIKELY. WAVES SUBSIDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BACKING SOUTH. A CHANCE OF
SNOW SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING
TO 2 TO 4 FEET.

$$

LSZ267-232330-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1017 AM EST THU FEB 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY
EVENING...

.REST OF TODAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN
THE AFTERNOON. WAVES 3 TO 5 FEET SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO
25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT.
WAVES BUILDING TO 2 TO 4 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW IN THE MORNING...THEN
SNOW...POSSIBLY MIXED WITH FREEZING RAIN IN THE AFTERNOON. WAVES
BUILDING TO 4 TO 7 FEET.
.FRIDAY NIGHT...NORTHEAST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. SNOW...POSSIBLY MIXED WITH FREEZING
RAIN. WAVES SUBSIDING TO 3 TO 6 FEET.
.SATURDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST GALES
TO 35 KNOTS IN THE AFTERNOON. FREEZING SPRAY. SNOW. WAVES
BUILDING TO 8 TO 11 FEET.
.SATURDAY NIGHT...NORTHWEST GALES TO 40 KNOTS DIMINISHING TO
20 TO 30 KNOTS AFTER MIDNIGHT. FREEZING SPRAY. SNOW SHOWERS
LIKELY. WAVES SUBSIDING TO 4 TO 7 FEET.
.SUNDAY...SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS. SNOW SHOWERS LIKELY. WAVES SUBSIDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BACKING SOUTH. A CHANCE OF
SNOW SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING
TO 1 TO 3 FEET.

$$
LSZ261-232330-
MAFOR 2316/
SUPERIOR WEST...GALE WARNING IN EFFECT...11710 11700 11710 11820
11130 12140 11150. FREEZING SPRAY LATE TONIGHT THROUGH LATE FRIDAY
NIGHT. CHANCE OF SNOW LATE FRIDAY MORNING. WAVES 1 TO 6 FEET
BUILDING TO 5 TO 8 FEET FRIDAY MORNING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11720 12710
12830 11130 12140. FREEZING SPRAY LATE. CHANCE OF SNOW LATE FRIDAY
MORNING. WAVES 1 TO 6 FEET.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...12720 11710
11720 11820 12130 11140. WAVES 1 TO 5 FEET.

SUPERIOR EAST...GALE WARNING IN EFFECT...11830 13720 12820 12140.
CHANCE OF SNOW LATE FRIDAY MORNING. WAVES 2 TO 6 FEET.

$$

JSS



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