Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 120920
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
420 AM EST THU JAN 12 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A 29.8 INCH TROUGH WILL MOVE EASTWARD TODAY JUST NORTH OF THE LAKE
AND WILL BE FOLLOWED BY A 30.8 INCH RIDGE INTO FRIDAY. THE 30.8 INCH
RIDGE WILL MOVE OVER THE LAKE DURING THE DAY ON FRIDAY...FOLLOWED BY
A WEAK TROUGH OF 30.4 INCHES FRIDAY NIGHT INTO SATURDAY. A 30.5 INCH
RIDGE WILL THEN BUILD ACROSS THE UPPER MISSISSIPPI RIVER VALLEY
SATURDAY INTO SUNDAY. THIS RIDGE WILL MOVE ACROSS THE GREAT LAKES
DURING THE DAY ON SUNDAY.

LSZ162-121730-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
420 AM EST THU JAN 12 2017 /320 AM CST THU JAN 12 2017/

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 11 AM EST /10 AM
CST/ THIS MORNING THROUGH THIS EVENING...
...GALE WARNING IN EFFECT FROM NOON EST /11 AM CST/ TODAY THROUGH
THIS EVENING...

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

$$

LSZ263-121730-
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-
420 AM EST THU JAN 12 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 11 AM EST THIS
MORNING THROUGH FRIDAY MORNING...
...GALE WARNING IN EFFECT FROM NOON EST TODAY THROUGH THIS
EVENING...

.EARLY THIS MORNING...WEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SNOW SHOWERS. WAVES CALM TO 2 FEET.
.TODAY...SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST GALES TO
45 KNOTS IN THE AFTERNOON. HEAVY FREEZING SPRAY. A CHANCE OF SNOW
SHOWERS. WAVES BUILDING TO 11 TO 15 FEET.
.TONIGHT...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. HEAVY FREEZING SPRAY. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. FREEZING SPRAY AFTER MIDNIGHT. A
CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO
7 FEET.
.SATURDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS IN THE AFTERNOON. FREEZING SPRAY IN THE MORNING. WAVES
SUBSIDING TO 2 TO 4 FEET.
.SATURDAY NIGHT...WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BACKING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-121730-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
420 AM EST THU JAN 12 2017

...GALE WARNING IN EFFECT FROM NOON EST TODAY THROUGH THIS
EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 1 PM EST THIS
AFTERNOON THROUGH FRIDAY MORNING...

.EARLY THIS MORNING...NORTHWEST WINDS 10 TO 20 KNOTS. A SLIGHT
CHANCE OF SNOW SHOWERS. WAVES CALM TO 2 FEET.
.TODAY...SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST GALES TO
45 KNOTS IN THE AFTERNOON. A FEW STORM FORCE GUSTS TO 50 KNOTS. A
CHANCE OF SNOW SHOWERS. HEAVY FREEZING SPRAY IN THE AFTERNOON. WAVES
BUILDING TO 11 TO 15 FEET.
.TONIGHT...NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. HEAVY FREEZING SPRAY. SNOW SHOWERS
LIKELY IN THE EVENING. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO 4 TO 7 FEET.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST IN THE
AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO
20 TO 30 KNOTS AFTER MIDNIGHT. FREEZING SPRAY AFTER MIDNIGHT. A
CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO
7 FEET.
.SATURDAY...WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS IN THE AFTERNOON. FREEZING SPRAY. A CHANCE OF SNOW
SHOWERS. WAVES TO 4 TO 8 FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.SATURDAY NIGHT...WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. WAVES BUILDING TO 3 TO 5 FEET...THEN SUBSIDING TO 2 TO
4 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ265-121730-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
420 AM EST THU JAN 12 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 3 PM EST THIS
AFTERNOON THROUGH FRIDAY MORNING...
...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH LATE
TONIGHT...

.EARLY THIS MORNING...NORTHWEST WINDS 10 TO 20 KNOTS. A SLIGHT
CHANCE OF SNOW SHOWERS. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO
2 FEET.
.TODAY...WEST WINDS 10 TO 20 KNOTS INCREASING TO GALES TO
35 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. HEAVY FREEZING
SPRAY IN THE AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET.
.TONIGHT...NORTHWEST GALES TO 45 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. HEAVY FREEZING SPRAY. SNOW SHOWERS. WAVES
BUILDING TO 7 TO 10 FEET...THEN SUBSIDING TO 3 TO 6 FEET.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
.SATURDAY...WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET.
.SATURDAY NIGHT...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS. WAVES CALM TO 2 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BACKING EAST. WAVES CALM
TO 2 FEET.

$$

LSZ266-121730-
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-
420 AM EST THU JAN 12 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 3 PM EST THIS
AFTERNOON THROUGH FRIDAY MORNING...
...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH LATE
TONIGHT...

.EARLY THIS MORNING...NORTHWEST WINDS 10 TO 20 KNOTS. A CHANCE OF
SNOW SHOWERS. WAVES 1 TO 3 FEET.
.TODAY...WEST WINDS 10 TO 20 KNOTS INCREASING TO GALES TO
35 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. HEAVY
FREEZING SPRAY IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 11 TO 15 FEET.
.TONIGHT...NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS
AFTER MIDNIGHT. HEAVY FREEZING SPRAY. SNOW SHOWERS LIKELY. WAVES
BUILDING TO 12 TO 17 FEET...THEN SUBSIDING TO 6 TO 9 FEET.
.FRIDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS IN THE AFTERNOON. HEAVY FREEZING SPRAY IN THE MORNING. A
CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING
TO 3 TO 6 FEET.
.SATURDAY...WEST WINDS 15 TO 25 KNOTS. FREEZING SPRAY. A CHANCE
OF SNOW SHOWERS. WAVES BUILDING TO 5 TO 8 FEET...THEN SUBSIDING
TO 3 TO 6 FEET.
.SATURDAY NIGHT...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 3 TO
5 FEET...THEN SUBSIDING TO 2 TO 4 FEET.
.MONDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ267-121730-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
420 AM EST THU JAN 12 2017

...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH LATE
TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THIS EVENING
THROUGH FRIDAY MORNING...

.EARLY THIS MORNING...NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF
SNOW SHOWERS. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.
.TODAY...NORTHEAST WINDS 5 TO 15 KNOTS BECOMING WEST 20 TO
30 KNOTS IN THE AFTERNOON. SNOW SHOWERS. FREEZING SPRAY IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 7 TO
10 FEET.
.TONIGHT...WEST GALES TO 45 KNOTS BECOMING NORTHWEST GALES TO
35 KNOTS AFTER MIDNIGHT. HEAVY FREEZING SPRAY. SNOW SHOWERS.
WAVES BUILDING TO 15 TO 20 FEET...THEN SUBSIDING TO 7 TO 10 FEET.
.FRIDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO
20 KNOTS IN THE AFTERNOON. FREEZING SPRAY IN THE MORNING. A
CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS.
WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 3 TO 5 FEET.
.SATURDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST IN THE
AFTERNOON. FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW
SHOWERS. WAVES BUILDING TO 4 TO 7 FEET...THEN SUBSIDING TO 3 TO
6 FEET.
.SATURDAY NIGHT...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO
3 FEET.
.MONDAY...SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ261-121730-
MAFOR 1210/
SUPERIOR WEST...GALE WARNING AND HEAVY FREEZING SPRAY WARNING IN
EFFECT...11620 11540 11552 11662 11652 11752 11742 11722. HEAVY
FREEZING SPRAY LATE THIS MORNING THROUGH THE EARLY OVERNIGHT. CHANCE
OF SNOW SHOWERS TONIGHT. WAVES 1 TO 3 FEET BUILDING TO 7 TO 11 FEET
TODAY. WAVES 8 TO 11 FEET SUBSIDING TO 3 TO 5 FEET TONIGHT.

SUPERIOR NORTH CENTRAL...GALE WARNING AND HEAVY FREEZING SPRAY
WARNING IN EFFECT...11600 11520 11550 12662 19672 11752 11757 11747.
HEAVY FREEZING SPRAY EARLY THIS AFTERNOON THROUGH FRIDAY MORNING.
CHANCE OF SNOW SHOWERS. WAVES 1 TO 2 FEET BUILDING TO 11 TO 15 FEET
TODAY. WAVES 10 TO 15 FEET SUBSIDING TO 6 TO 9 FEET TONIGHT.

SUPERIOR SOUTH CENTRAL...GALE WARNING AND HEAVY FREEZING SPRAY
WARNING IN EFFECT...11710 11610 11630 11652 11662 11667 11757 11747.
HEAVY FREEZING SPRAY THIS AFTERNOON THROUGH LATE FRIDAY MORNING.
CHANCE OF SNOW SHOWERS LATE TONIGHT. WAVES 1 TO 3 FEET BUILDING TO 5
TO 8 FEET TODAY. WAVES 9 TO 13 FEET SUBSIDING TO 6 TO 9 FEET TONIGHT.

SUPERIOR EAST...GALE WARNING AND HEAVY FREEZING SPRAY WARNING IN
EFFECT...11810 11100 11520 11540 12667 11757 11747. HEAVY FREEZING
SPRAY TONIGHT THROUGH FRIDAY MORNING. CHANCE OF SNOW SHOWERS. WAVES 2
TO 3 FEET BUILDING TO 6 TO 9 FEET TODAY. WAVES 12 TO 16 FEET BUILDING
TO 14 TO 18 FEET...THEN SUBSIDING TO 10 TO 13 FEET TONIGHT.

$$

RITZMAN



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