Great Lakes Forecast
Issued by NWS

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200
FZUS63 KMQT 211505
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1005 AM EST TUE FEB 21 2017

.SYNOPSIS...A 29.2 INCH LOW PRESSURE OVER FAR NORTHERN ONTARIO
WILL DRIFT ACROSS SOUTHERN HUDSON BAY THROUGH TONIGHT. AN
ASSOCIATED 29.6 INCH TROUGH EXTENDING SOUTH ACROSS CENTRAL LAKE
SUPERIOR WILL SHIFT EAST OF THE LAKE THIS MORNING. LOW PRESSURE OF
29.6 INCHES EMERGING OVER THE DAKOTAS THIS EVENING WILL CROSS THE
UPPER GREAT LAKES WEDNESDAY THROUGH WEDNESDAY EVENING...THEN
REACH QUEBEC THURSDAY. IN ITS WAKE...A 30.0 INCH HIGH PRESSURE
RIDGE WILL BUILD SOUTHEAST TO THE UPPER GREAT LAKES THURSDAY AS
LOW PRESSURE OF 29.2 INCHES ORGANIZES OVER THE CENTRAL PLAINS.
THIS LOW WILL TRACK NORTHEAST...REACHING GEORGIAN BAY SATURDAY
MORNING AND THEN QUEBEC SATURDAY AFTERNOON. IN ITS WAKE...HIGH
PRESSURE OF 30.2 INCHES WILL BUILD OVER THE PLAINS SATURDAY.

LSZ162-212315-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1005 AM EST TUE FEB 21 2017 /905 AM CST TUE FEB 21 2017/

.REST OF TODAY...SOUTHWEST 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...NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...WEST WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES CALM
TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST
AFTER MIDNIGHT. A CHANCE OF SLEET IN THE EVENING. A CHANCE OF
RAIN AND SNOW SHOWERS. A SLIGHT CHANCE OF FREEZING RAIN AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...NORTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET.
.FRIDAY...NORTHEAST GALES TO 35 KNOTS BECOMING NORTH 20 TO
30 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 10 TO 14 FEET...THEN SUBSIDING TO 6 TO 9 FEET.
.SATURDAY...NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 3 TO 5 FEET...THEN BUILDING TO 4 TO 7 FEET.

$$

LSZ263-212315-
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-
1005 AM EST TUE FEB 21 2017

.REST OF TODAY...WEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS IN THE AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO
CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF RAIN
SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW 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 LIKELY...POSSIBLY MIXED
WITH SLEET IN THE EVENING...THEN A CHANCE OF RAIN SHOWERS...
POSSIBLY MIXED WITH FREEZING RAIN AFTER MIDNIGHT. A CHANCE OF SNOW
SHOWERS. WAVES CALM TO 2 FEET.
.THURSDAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET.
.FRIDAY...NORTHEAST GALES TO 35 KNOTS BACKING NORTH. A CHANCE OF
SNOW SHOWERS. FREEZING SPRAY. WAVES BUILDING TO 10 TO 14 FEET...
THEN SUBSIDING TO 7 TO 10 FEET.
.SATURDAY...NORTHWEST WINDS 20 TO 30 KNOTS. FREEZING SPRAY. A
CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 3 TO 6 FEET...THEN
BUILDING TO 5 TO 8 FEET.

$$

LSZ264-212315-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1005 AM EST TUE FEB 21 2017

.REST OF TODAY...WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST IN
THE AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTH WINDS 5 TO 15 KNOTS VEERING WEST AFTER MIDNIGHT.
A SLIGHT CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
.WEDNESDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY MIXED WITH SNOW
AND SLEET IN THE AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS. RAIN SHOWERS
LIKELY...POSSIBLY MIXED WITH SLEET IN THE EVENING...THE A CHANCE
OF RAIN SHOWERS...POSSIBLY MIXED WITH FREEZING RAIN AFTER
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 1 TO 3
FEET.
.THURSDAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH GALES TO
35 KNOTS. A CHANCE OF SNOW SHOWERS. FREEZING SPRAY. WAVES
BUILDING TO 9 TO 12 FEET.
.SATURDAY...NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 5 TO 8 FEET.

$$

LSZ265-212315-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1005 AM EST TUE FEB 21 2017

.REST OF TODAY...WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST IN
THE AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES CALM
TO 2 FEET.
.WEDNESDAY NIGHT...NORTHWEST WINDS 15 TO 25 KNOTS. RAIN SHOWERS
LIKELY...POSSIBLY MIXED WITH SLEET IN THE EVENING...THEN A CHANCE
OF RAIN SHOWERS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 1 TO 3 FEET.
.THURSDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH GALES TO
35 KNOTS. SNOW SHOWERS LIKELY. FREEZING SPRAY. WAVES BUILDING TO
7 TO 11 FEET.
.SATURDAY...NORTHWEST GALES TO 35 KNOTS. FREEZING SPRAY. A CHANCE
OF SNOW SHOWERS. WAVES SUBSIDING TO 4 TO 7 FEET.

$$

LSZ266-212315-
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-
1005 AM EST TUE FEB 21 2017

.REST OF TODAY...WEST WINDS 10 TO 20 KNOTS. WAVES 2 TO 4 FEET
SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES CALM
TO 2 FEET.
.WEDNESDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS...
POSSIBLY MIXED WITH SNOW AND SLEET. WAVES BUILDING TO 2 TO
4 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 4 TO 7 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTH GALES TO
35 KNOTS. SNOW SHOWERS LIKELY. FREEZING SPRAY. WAVES BUILDING TO
10 TO 14 FEET.
.SATURDAY...NORTHWEST GALES TO 40 KNOTS. FREEZING SPRAY. SNOW
SHOWERS LIKELY. WAVES 11 TO 15 FEET SUBSIDING TO 5 TO 8 FEET.

$$

LSZ267-212315-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1005 AM EST TUE FEB 21 2017

.REST OF TODAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN
THE AFTERNOON. A CHANCE OF RAIN SHOWERS IN THE AFTERNOON. WAVES
CALM TO 2 FEET.
.WEDNESDAY NIGHT...NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A SLIGHT
CHANCE OF SNOW SHOWERS AND SLEET AFTER MIDNIGHT. WAVES BUILDING
TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 3 TO 5 FEET.
.FRIDAY...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS. SNOW SHOWERS LIKELY. FREEZING SPRAY. WAVES BUILDING TO
6 TO 9 FEET...THEN SUBSIDING TO 4 TO 7 FEET.
.SATURDAY...NORTH GALES TO 35 KNOTS BACKING NORTHWEST. FREEZING
SPRAY. SNOW SHOWERS LIKELY. WAVES BUILDING TO 11 TO 15 FEET...
THEN SUBSIDING TO 4 TO 7 FEET.

$$
LSZ261-212315-
MAFOR 2116/
SUPERIOR WEST 11520 11410 11100 11400 12500 12400. WAVES 2 FEET
OR LESS.

SUPERIOR NORTH CENTRAL 11640 11530 11420 11410 11510 11600 12700.
WAVES 1 TO 4 FEET.

SUPERIOR SOUTH CENTRAL 11630 11510 11410 12420 12510 11500. WAVES
2 FEET OR LESS.

SUPERIOR EAST 11630 11620 11410 11320 11420 11520 12510. WAVES
CALM TO 3 FEET.

$$

KEC



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