930
FZUS63 KMQT 220234
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
934 PM 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 30.6 INCHES SPRAWLED OUT OVER THE
MISSISSIPPI RIVER VALLEY IS CURRENTLY EXTENDING A 30.4 INCH RIDGE
INTO THE GREAT LAKES. THE HIGH AND RIDGE WILL SHIFT EAST 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.
LSZ162-221045-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
934 PM EST FRI FEB 21 2025 /834 PM CST FRI FEB 21 2025/
REST OF TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE
FORCE GUSTS TO 35 KNOTS POSSIBLE BECOMING WEST 20 TO 30 KNOTS BY
MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE. FREEZING
SPRAY. WAVES 6 TO 9 FEET OCCASIONALLY TO 11 FEET SUBSIDING TO
3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS BY LATE MORNING, THEN DIMINISHING TO 10 TO 20 KNOTS BY
MID AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS IN THE MORNING.
WAVES SUBSIDING TO 2 TO 4 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MIDNIGHT, THEN BACKING SOUTHWEST LATE. WAVES
SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS,
POSSIBLY MIXED WITH RAIN AND FREEZING RAIN 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 SHOWERS, POSSIBLY
MIXED WITH SNOW. WAVES BUILDING TO 1 TO 3 FEET.
MONDAY
WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
MONDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
TUESDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES
CALM TO 2 FEET.
WEDNESDAY
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ263-221045-
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-
934 PM EST FRI FEB 21 2025
..GALE WARNING IN EFFECT UNTIL 1 AM EST SATURDAY
REST OF TONIGHT
SOUTHWEST GALES TO 35 KNOTS VEERING WEST BY
MIDNIGHT, THEN DIMINISHING TO 20 TO 30 KNOTS LATE. FREEZING
SPRAY. WAVES 7 TO 11 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 BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST
LATE. A SLIGHT CHANCE OF SNOW SHOWERS IN THE EVENING. WAVES
SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SNOW
SHOWERS 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 SHOWERS, POSSIBLY
MIXED WITH SNOW. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
MONDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
IN THE AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
MONDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES
CALM TO 2 FEET.
WEDNESDAY
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ264-221045-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
934 PM EST FRI FEB 21 2025
..GALE WARNING IN EFFECT UNTIL 1 AM EST SATURDAY
REST OF TONIGHT
SOUTHWEST GALES TO 35 KNOTS VEERING WEST BY
MIDNIGHT, THEN DIMINISHING TO 20 TO 30 KNOTS LATE. FREEZING
SPRAY. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES 6 TO 9 FEET
OCCASIONALLY TO 11 FEET 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 DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTH BY
MIDNIGHT, THEN VEERING NORTHEAST LATE. A SLIGHT CHANCE OF SNOW
SHOWERS IN THE EVENING. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS.
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
IN THE AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
MONDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
NORTH WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES
CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ265-221045-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
934 PM EST FRI FEB 21 2025
REST OF TONIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS. WAVES 1 TO
3 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST BY
MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS IN THE EVENING. WAVES
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 10 TO 20 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF FREEZING RAIN IN THE
EVENING. A CHANCE OF SNOW SHOWERS. A CHANCE OF RAIN SHOWERS AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
WEST WINDS 15 TO 25 KNOTS. WAVES CALM TO 2 FEET.
MONDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ266-221045-
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-
934 PM EST FRI FEB 21 2025
REST OF TONIGHT
SOUTHWEST WINDS 20 TO 30 KNOTS VEERING WEST BY
MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE. FREEZING
SPRAY. A SLIGHT CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES 4 TO
7 FEET OCCASIONALLY TO 9 FEET 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. FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SNOW
SHOWERS. 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 VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS IN THE EVENING, THEN
SNOW SHOWERS, POSSIBLY MIXED WITH RAIN AFTER MIDNIGHT. WAVES
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO
2 TO 4 FEET.
MONDAY
WEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN SHOWERS,
POSSIBLY MIXED WITH SNOW IN THE MORNING. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
MONDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST.
WAVES CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES
BUILDING TO 1 TO 3 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ267-221045-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
934 PM EST FRI FEB 21 2025
REST OF TONIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS. FREEZING SPRAY
AFTER MIDNIGHT. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET BUILDING
TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET, THEN SUBSIDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY LATE
MORNING, THEN DIMINISHING TO 10 TO 20 KNOTS BY MID AFTERNOON.
FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH
5 TO 15 KNOTS LATE. A CHANCE OF SNOW SHOWERS. 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
SHOWERS IN THE EVENING, THEN SNOW SHOWERS, POSSIBLY MIXED WITH
RAIN AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY
TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
MONDAY
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST IN THE
AFTERNOON. A CHANCE OF SNOW SHOWERS IN THE MORNING. A CHANCE OF
RAIN SHOWERS. WAVES 2 TO 4 FEET.
MONDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST.
WAVES CALM TO 2 FEET.
WEDNESDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING NORTH. A CHANCE
OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 1 TO
3 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ261-221045-
MAFOR 2204/
SUPERIOR WEST...GALE WARNING IN EFFECT...11651 11641 11640 11630
12520 12620. WAVES 6 TO 9 FEET SUBSIDING TO 4 TO 7 FEET
OVERNIGHT. WAVES 3 TO 6 FEET SATURDAY. WAVES 2 TO 4 FEET SATURDAY
EVENING.
SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11651 12641
13630 11620 11610. A CHANCE OF SNOW SHOWERS SATURDAY. WAVES 7 TO
11 FEET OVERNIGHT. WAVES 5 TO 8 FEET SUBSIDING TO 3 TO 6 FEET
SATURDAY. WAVES 2 TO 4 FEET SATURDAY EVENING.
SUPERIOR SOUTH CENTRAL 11530 14630 11620 11510 11500. A CHANCE OF
SNOW SHOWERS SATURDAY AFTERNOON. WAVES 3 TO 5 FEET SUBSIDING TO 2
TO 4 FEET OVERNIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
SATURDAY. WAVES 2 FEET OR LESS SATURDAY EVENING. WAVE HEIGHTS ARE
FOR ICE FREE AREAS.
SUPERIOR EAST 11541 11631 11630 12631 11630 12620. A CHANCE OF
SNOW SHOWERS SATURDAY AND SATURDAY EVENING. WAVES 5 TO 8 FEET
OVERNIGHT. WAVES 4 TO 7 FEET SUBSIDING TO 3 TO 6 FEET SATURDAY.
WAVES 3 TO 5 FEET SUBSIDING TO 2 TO 4 FEET SATURDAY EVENING.
BW
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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