475
FZUS63 KMQT 211503
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1003 AM EST TUE JAN 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
A 30.8 INCH HIGH PRESSURE OVER THE SOUTHERN PLAINS
WILL WEAKEN TO 30.7 INCHES AS IT MOVES EAST, REACHING THE LOWER
OHIO RIVER VALLEY THIS EVENING AND THE MID-ATLANTIC STATES DURING
WEDNESDAY. MEANWHILE, A 29.7 INCH LOW PRESSURE OVER SOUTHERN
MANITOBA THIS EVENING WILL TRACK EAST-SOUTHEAST, WEAKENING TO 29.9
INCHES AS IT CROSSES LAKE SUPERIOR DURING WEDNESDAY AFTERNOON AND
WEDNESDAY NIGHT. THE LOW WILL THEN TRANSITION TO A 30.0 INCH
TROUGH BY THE TIME IT REACHES THE LOWER GREAT LAKES BY LATE
THURSDAY. IN ITS WAKE, A 30.6 INCH HIGH PRESSURE RIDGE MOVING OUT
OVER THE PLAINS ON THURSDAY WILL WEAKEN TO 30.4 INCHES AS IT MOVES
TO THE MISSISSIPPI RIVER VALLEY DURING THURSDAY NIGHT AND THEN TO
THE SOUTHEAST U.S. ON SATURDAY. MEANWHILE, A 29.2 INCH LOW
PRESSURE TRACKING EAST TO HUDSON BAY WILL SWING A 29.8 INCH TROUGH
ACROSS THE DAKOTAS ON FRIDAY AND TO LAKE SUPERIOR ON SATURDAY.
LSZ162-212315-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1003 AM EST TUE JAN 21 2025 /903 AM CST TUE JAN 21 2025/
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST TO
30 KNOTS WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE BY MID
AFTERNOON. HEAVY FREEZING SPRAY. SCATTERED SNOW SHOWERS. WAVES
3 TO 6 FEET OCCASIONALLY TO 8 FEET BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS LATE.
HEAVY FREEZING SPRAY. A CHANCE OF SNOW. WAVES BUILDING TO 7 TO
10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
WEDNESDAY
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST BY
LATE MORNING, THEN VEERING NORTH BY MID AFTERNOON. A CHANCE OF
SNOW SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
WEDNESDAY NIGHT
NORTH WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF
SNOW SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
THURSDAY
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
1 TO 3 FEET.
THURSDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW
SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY
WEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
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-
1003 AM EST TUE JAN 21 2025
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE BY LATE MORNING,
THEN BACKING SOUTHWEST BY MID AFTERNOON. HEAVY FREEZING SPRAY.
NUMEROUS SNOW SHOWERS LATE IN THE MORNING. SCATTERED SNOW SHOWERS
IN THE AFTERNOON. WAVES 5 TO 8 FEET OCCASIONALLY TO 10 FEET
BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS LATE.
HEAVY FREEZING SPRAY. A CHANCE OF SNOW IN THE EVENING. SNOW
LIKELY AFTER MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET, THEN SUBSIDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
WEDNESDAY
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH BY MID
AFTERNOON. FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
WEDNESDAY NIGHT
NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
THURSDAY
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
THURSDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW
SHOWERS. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
WEST WINDS 20 TO 30 KNOTS. FREEZING SPRAY. WAVES
SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ264-212315-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1003 AM EST TUE JAN 21 2025
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS 15 TO 25 KNOTS INCREASING TO 30 KNOTS
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE. HEAVY FREEZING
SPRAY. SNOW SHOWERS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET
BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS BY
MIDNIGHT. HEAVY FREEZING SPRAY. A CHANCE OF SNOW IN THE EVENING.
SNOW LIKELY AFTER MIDNIGHT. WAVES SUBSIDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
WEDNESDAY
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH BY MID
AFTERNOON. FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
WEDNESDAY NIGHT
NORTH WINDS 20 TO 30 KNOTS. FREEZING SPRAY. A
CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 4 TO 8 FEET
OCCASIONALLY TO 10 FEET.
THURSDAY
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
THURSDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST
AFTER MIDNIGHT. WAVES 2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 20 TO 30 KNOTS. FREEZING SPRAY. A
CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 5 TO 9 FEET
OCCASIONALLY TO 11 FEET.
SATURDAY
WEST WINDS 20 TO 30 KNOTS VEERING NORTHWEST. A CHANCE
OF SNOW SHOWERS. FREEZING SPRAY. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET, THEN SUBSIDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ265-212315-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1003 AM EST TUE JAN 21 2025
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE BECOMING SOUTHWEST 20 TO 30 KNOTS BY
MID AFTERNOON. HEAVY FREEZING SPRAY. SCATTERED SNOW SHOWERS.
WAVES 4 TO 8 FEET OCCASIONALLY TO 10 FEET, THEN SUBSIDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
TONIGHT
SOUTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW AFTER
MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
WEDNESDAY
SOUTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY LATE MORNING, THEN BECOMING WEST 10 TO 20 KNOTS BY
MID AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO CALM
TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
WEDNESDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTH
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
THURSDAY
NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF SNOW
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
THURSDAY NIGHT
WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO
1 TO 3 FEET.
FRIDAY
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.
SATURDAY
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW SHOWERS.
WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
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-
1003 AM EST TUE JAN 21 2025
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST TO
30 KNOTS WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE BY MID
AFTERNOON. HEAVY FREEZING SPRAY. SNOW SHOWERS LATE IN THE
MORNING. SCATTERED SNOW SHOWERS IN THE AFTERNOON. WAVES 5 TO
8 FEET OCCASIONALLY TO 10 FEET BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET.
TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS BY
MIDNIGHT. HEAVY FREEZING SPRAY. A CHANCE OF SNOW. WAVES SUBSIDING
TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
WEDNESDAY
SOUTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY LATE MORNING, THEN VEERING WEST BY MID AFTERNOON.
FREEZING SPRAY IN THE MORNING. A CHANCE OF SNOW SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
WEDNESDAY NIGHT
WEST WINDS 20 TO 30 KNOTS VEERING NORTH AFTER
MIDNIGHT. A CHANCE OF SNOW SHOWERS. FREEZING SPRAY AFTER
MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
THURSDAY
NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS IN THE AFTERNOON. FREEZING SPRAY IN THE MORNING. A
CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
THURSDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
WEST WINDS 20 TO 30 KNOTS VEERING NORTHWEST. A CHANCE
OF SNOW SHOWERS. FREEZING SPRAY. WAVES BUILDING TO 7 TO 11 FEET
OCCASIONALLY TO 14 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ267-212315-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1003 AM EST TUE JAN 21 2025
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...
REST OF TODAY
WEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE BY LATE MORNING,
THEN BACKING SOUTHWEST BY MID AFTERNOON. HEAVY FREEZING SPRAY.
SNOW SHOWERS. WAVES 5 TO 9 FEET OCCASIONALLY TO 11 FEET, THEN
SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
TONIGHT
SOUTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS BY
MIDNIGHT. HEAVY FREEZING SPRAY. A CHANCE OF SNOW. WAVES 5 TO
8 FEET OCCASIONALLY TO 10 FEET.
WEDNESDAY
SOUTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. FREEZING SPRAY IN THE MORNING. SNOW
SHOWERS LIKELY IN THE MORNING, THEN A CHANCE OF SNOW SHOWERS IN
THE AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
WEDNESDAY NIGHT
WEST WINDS 15 TO 25 KNOTS VEERING NORTH AFTER
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET, THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
THURSDAY
NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
THURSDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS BACKING WEST
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
FRIDAY
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES
BUILDING TO 4 TO 8 FEET OCCASIONALLY TO 10 FEET.
SATURDAY
SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST
GALES TO 35 KNOTS. A CHANCE OF SNOW SHOWERS. FREEZING SPRAY.
WAVES BUILDING TO 7 TO 11 FEET OCCASIONALLY TO 14 FEET.
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.
LSZ261-212315-
MAFOR 2116/
SUPERIOR WEST...HEAVY FREEZING SPRAY WARNING IN EFFECT...11642
19657 14542 19557 12547 11530. WAVES 5 TO 9 FEET THIS AFTERNOON
AND TONIGHT SUBSIDING TO 3 TO 6 FEET WEDNESDAY MORNING.
SUPERIOR NORTH CENTRAL...HEAVY FREEZING SPRAY WARNING IN EFFECT...
11647 11647 19652 12547 19552 13540 11530. WAVES 3 TO 6 FEET
BUILDING TO 8 TO 11 FEET THIS AFTERNOON. WAVES 7 TO 11 FEET
SUBSIDING TO 6 TO 9 FEET TONIGHT AND TO 4 TO 7 FEET WEDNESDAY
MORNING.
SUPERIOR SOUTH CENTRAL...HEAVY FREEZING SPRAY WARNING IN EFFECT...
11642 19657 11542 13530 12540 11530. A CHANCE OF SNOW OVERNIGHT.
WAVES 5 TO 8 FEET THIS AFTERNOON. WAVES 3 TO 6 FEET TONIGHT AND
WEDNESDAY MORNING.
SUPERIOR EAST...HEAVY FREEZING SPRAY WARNING IN EFFECT...12647
11547 13542 12547. A CHANCE OF SNOW OVERNIGHT. WAVES 6 TO 9 FEET.
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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