137
FZUS63 KMQT 211452
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
952 AM EST FRI FEB 21 2025
FOR WATERS BEYOND 5 NAUTICAL MILES OF SHORE ON LAKE SUPERIOR.
WAVES ARE THE SIGNIFICANT WAVE HEIGHT - THE AVERAGE OF THE
HIGHEST 1/3 OF THE WAVE SPECTRUM. OCCASIONAL WAVE HEIGHT IS THE
AVERAGE OF THE HIGHEST 1/10 OF THE WAVE SPECTRUM.
SYNOPSIS
HIGH PRESSURE OF 30.8 INCHES SPRAWLED OUT OVER THE
PLAINS IS CURRENTLY EXTENDING A 30.5 INCH RIDGE INTO THE WESTERN
GREAT LAKES. THE HIGH AND RIDGE WILL SHIFT EAST THIS AFTERNOON AND
TONIGHT, AND BY SATURDAY MORNING, THE HIGH WILL BE LOCATED OVER THE
SOUTHEAST U.S. AT A PRESSURE OF 30.6 INCHES. MEANWHILE, A 29.8 INCH
LOW PRESSURE TROUGH WILL SWEEP EAST, REACHING NORTHERN ONTARIO
TONIGHT AND SATURDAY. AT A PRESSURE OF 30.0 INCHES, THE TAIL END OF
THIS TROUGH WILL DRIFT SOUTH OVER LAKE SUPERIOR DURING SATURDAY
NIGHT. THE TROUGH WILL THEN QUICKLY LIFT NORTH ON SUNDAY AS 29.2
INCH LOW PRESSURE MOVES OUT OVER THE PRAIRIE PROVINCES. THE LOW WILL
THEN TRACK EAST, REACHING NORTHERN ONTARIO BY MONDAY MORNING AND
NORTHERN QUEBEC DURING MONDAY NIGHT. ONE ASSOCIATED TROUGH AT 29.4
INCHES WILL CROSS LAKE SUPERIOR EARLY MONDAY FOLLOWED BY A SECOND AT
29.6 INCHES EARLY ON TUESDAY. IN ITS WAKE, A WEAK 29.9 INCH HIGH
PRESSURE RIDGE WILL REACH LAKE SUPERIOR TUESDAY EVENING.
LSZ162-212300-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
952 AM EST FRI FEB 21 2025 /852 AM CST FRI FEB 21 2025/
REST OF TODAY
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
20 TO 30 KNOTS. FREEZING SPRAY IN THE AFTERNOON. WAVES CALM TO
2 FEET BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
TONIGHT
SOUTHWEST WINDS 20 TO 30 KNOTS VEERING WEST BY
MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE. FREEZING SPRAY
IN THE EVENING. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO
11 FEET, THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY
SOUTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW IN THE
MORNING. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 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 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW. WAVES
BUILDING TO 1 TO 3 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET.
TUESDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES
CALM TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ263-212300-
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-
952 AM EST FRI FEB 21 2025
...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH LATE
TONIGHT...
REST OF TODAY
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO
20 TO 30 KNOTS. WAVES 1 TO 3 FEET BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
TONIGHT
SOUTHWEST GALES TO 35 KNOTS VEERING WEST BY MIDNIGHT,
THEN DIMINISHING TO 20 TO 30 KNOTS LATE. FREEZING SPRAY. WAVES
BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING
TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF SNOW.
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN THE
AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN, POSSIBLY MIXED
WITH SNOW. WAVES BUILDING TO 1 TO 3 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM
TO 2 FEET.
TUESDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM
TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ264-212300-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
952 AM EST FRI FEB 21 2025
...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH LATE
TONIGHT...
REST OF TODAY
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS BY LATE MORNING, THEN INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
TONIGHT
SOUTHWEST GALES TO 35 KNOTS VEERING WEST BY MIDNIGHT,
THEN DIMINISHING TO 20 TO 30 KNOTS LATE. FREEZING SPRAY. WAVES
BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET, THEN SUBSIDING
TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF SNOW.
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF SNOW. WAVES SUBSIDING TO CALM TO
2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW. WAVES
BUILDING TO 1 TO 3 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM
TO 2 FEET.
TUESDAY
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES
CALM TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ265-212300-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
952 AM EST FRI FEB 21 2025
REST OF TODAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS. WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS. A SLIGHT CHANCE OF SNOW. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST
AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT. WAVES
CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF SNOW. A CHANCE OF RAIN AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES CALM
TO 2 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST. WAVES
CALM TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ266-212300-
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-
952 AM EST FRI FEB 21 2025
REST OF TODAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST BY
LATE MORNING, THEN INCREASING TO 15 TO 25 KNOTS BY MID AFTERNOON.
WAVES 1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO
3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TONIGHT
SOUTHWEST WINDS 20 TO 30 KNOTS VEERING WEST BY
MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE. FREEZING SPRAY
AFTER MIDNIGHT. WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO
13 FEET, THEN SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A SLIGHT CHANCE OF SNOW. WAVES SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW. WAVES SUBSIDING
TO CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW. A CHANCE OF RAIN
AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST. WAVES
CALM TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ267-212300-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
952 AM EST FRI FEB 21 2025
REST OF TODAY
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO
15 TO 25 KNOTS. WAVES CALM TO 2 FEET BUILDING TO 2 TO 4 FEET.
TONIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MIDNIGHT, THEN BECOMING WEST 15 TO 25 KNOTS LATE.
FREEZING SPRAY. WAVES BUILDING TO 4 TO 8 FEET OCCASIONALLY TO
10 FEET.
SATURDAY
SOUTHWEST WINDS 15 TO 25 KNOTS. FREEZING SPRAY IN THE
MORNING. A CHANCE OF SNOW. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW. WAVES SUBSIDING
TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
IN THE AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW.
WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
MONDAY
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. A CHANCE
OF SNOW. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM TO
2 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ261-212300-
MAFOR 2116/
SUPERIOR WEST...GALE WARNING IN EFFECT...11530 11540 13551 11640
11630 11530. WAVES 2 TO 6 FEET THIS AFTERNOON. WAVES 5 TO 9 FEET
SUBSIDING TO 4 TO 7 FEET TONIGHT. WAVES 3 TO 6 FEET SATURDAY
MORNING.
SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11530 12540
11550 11651 11641 11631 11630. WAVES 2 FEET OR LESS BUILDING TO 5
TO 8 FEET THIS AFTERNOON. WAVES 6 TO 10 FEET BUILDING TO 7 TO 11
FEET TONIGHT. WAVES 5 TO 8 FEET SATURDAY MORNING.
SUPERIOR SOUTH CENTRAL 11510 11520 11430 12530 13630. WAVES 1 TO
4 FEET. WAVE HEIGHTS ARE FOR ICE FREE AREAS.
SUPERIOR EAST 12520 11530 12541 11631 11630 11631. WAVES 1 TO 3
FEET THIS AFTERNOON BUILDING TO 5 TO 8 FEET TONIGHT. WAVES 5 TO 7
FEET SATURDAY MORNING.
ROLFSON
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/MQT/GLFTABLE
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
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