Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FZUS63 KMQT 230752
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
352 AM EDT SUN APR 23 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.

.SYNOPSIS...A 30.0 INCH TROUGH OVER LAKE SUPERIOR EARLY THIS
MORNING WILL MOVE SOUTHWARD TODAY ON THE SOUTHERN FLANK OF A 30.4
INCH RIDGE BUILDING OVER NORTHERN ONTARIO THAT REMAINS THROUGH
THURSDAY. AS THIS RIDGE DRIFTS TO QUEBEC ON MONDAY...A 29.5 INCH
LOW PRESSURE WILL ORGANIZE OVER THE CENTRAL PLAINS AND WILL PUSH A
29.7 INCH TROUGH ACROSS THE UPPER GREAT LAKES ON TUESDAY AND
TUESDAY NIGHT. A 29.4 INCH LOW PRESSURE SYSTEM WILL ORGANIZE
WEDNESDAY MORNING OVER SOUTHWEST WISCONSIN AND DEEPEN TO 29.2
INCHES OVER LAKE MICHIGAN THURSDAY MORNING AND MOVES NORTH TO LAKE
SUPERIOR THURSDAY AFTERNOON.

LSZ162-231600-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
352 AM EDT SUN APR 23 2017 /252 AM CDT SUN APR 23 2017/

.EARLY THIS MORNING...NORTHEAST WINDS 10 TO 20 KNOTS. RAIN...
POSSIBLY MIXED WITH SNOW. WAVES CALM TO 2 FEET BUILDING TO 1 TO
3 FEET.
.TODAY...EAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN AND SNOW.
WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF SNOW
THROUGH EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 5 TO
8 FEET OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO 2 TO
4 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTHEAST WINDS 20 TO 30 KNOTS. RAIN LIKELY.
FREEZING RAIN AND SNOW LIKELY...POSSIBLY MIXED WITH SLEET AFTER
MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. A CHANCE OF SNOW. A CHANCE OF RAIN. WAVES BUILDING TO
7 TO 11 FEET OCCASIONALLY TO 14 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO 1 TO
3 FEET.

$$

LSZ263-231600-
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-
352 AM EDT SUN APR 23 2017

.EARLY THIS MORNING...NORTHEAST WINDS 15 TO 25 KNOTS. SNOW...
POSSIBLY MIXED WITH RAIN. WAVES 2 TO 4 FEET BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
.TODAY...NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED WITH
RAIN. WAVES SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO 25 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES BUILDING TO 2 TO 4 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. RAIN LIKELY. WAVES SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF FREEZING RAIN THROUGH MIDNIGHT. RAIN
LIKELY. FREEZING RAIN LIKELY AFTER MIDNIGHT. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. SNOW...POSSIBLY
MIXED WITH FREEZING RAIN AND SLEET LIKELY...THEN A CHANCE OF
SNOW...POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN. WAVES
SUBSIDING TO 1 TO 3 FEET.

$$

LSZ264-231600-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
352 AM EDT SUN APR 23 2017

.EARLY THIS MORNING...NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF
SNOW...POSSIBLY MIXED WITH RAIN. WAVES 2 TO 4 FEET BUILDING TO
3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TODAY...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. A SLIGHT CHANCE OF SNOW THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW. A CHANCE OF RAIN AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...EAST WINDS 20 TO 30 KNOTS. A CHANCE OF SNOW THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH
MIDNIGHT...THEN RAIN LIKELY AFTER MIDNIGHT. WAVES SUBSIDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
2 TO 4 FEET.
.TUESDAY NIGHT...NORTH WINDS 20 TO 30 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. RAIN AND FREEZING RAIN LIKELY. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST GALES TO 35 KNOTS. SNOW...POSSIBLY MIXED
WITH FREEZING RAIN AND SLEET LIKELY...THEN A CHANCE OF SNOW.
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN. WAVES
SUBSIDING TO 2 TO 4 FEET.

$$

LSZ265-231600-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
352 AM EDT SUN APR 23 2017

.EARLY THIS MORNING...NORTH WINDS 15 TO 25 KNOTS. RAIN AND SNOW
LIKELY. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN
THROUGH EARLY AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SNOW.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF RAIN AND
SNOW THROUGH EARLY AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN.
WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
20 TO 30 KNOTS AFTER MIDNIGHT. RAIN. WAVES SUBSIDING TO CALM TO
2 FEET...THEN BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. SLEET LIKELY. SNOW...
POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 9 TO 12 FEET
OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST. RAIN
AND SNOW LIKELY...THEN A CHANCE OF RAIN. WAVES SUBSIDING TO 2 TO
4 FEET.

$$

LSZ266-231600-
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-
352 AM EDT SUN APR 23 2017

.EARLY THIS MORNING...NORTH WINDS 15 TO 25 KNOTS. RAIN...POSSIBLY
MIXED WITH SNOW. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO 20 KNOTS
BY MID AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN
THROUGH EARLY AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...NORTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO 20 KNOTS
AFTER MIDNIGHT. A CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. A CHANCE OF RAIN...POSSIBLY MIXED WITH SNOW
THROUGH EARLY AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET
OCCASIONALLY TO 11 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN. WAVES SUBSIDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
.TUESDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING
NORTHEAST 20 TO 30 KNOTS AFTER MIDNIGHT. RAIN. WAVES BUILDING TO
6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.WEDNESDAY...NORTHEAST GALES TO 35 KNOTS. FREEZING RAIN AND SLEET
LIKELY. RAIN AND SNOW LIKELY. WAVES BUILDING TO 9 TO 12 FEET
OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST
15 TO 25 KNOTS. A CHANCE OF RAIN AND SNOW. WAVES SUBSIDING TO 2
TO 4 FEET.

$$

LSZ267-231600-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
352 AM EDT SUN APR 23 2017

.EARLY THIS MORNING...NORTHWEST WINDS 10 TO 20 KNOTS. RAIN
LIKELY...POSSIBLY MIXED WITH SNOW. WAVES 1 TO 3 FEET BUILDING TO
2 TO 4 FEET.
.TODAY...NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW...POSSIBLY MIXED WITH
RAIN THROUGH EARLY AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.TONIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. A SLIGHT CHANCE OF SNOW...POSSIBLY MIXED WITH RAIN.
WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY...EAST WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN...POSSIBLY MIXED WITH
SNOW THROUGH EARLY AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
.MONDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE
OF RAIN. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.TUESDAY...SOUTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES SUBSIDING TO
1 TO 3 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST
AFTER MIDNIGHT. A CHANCE OF RAIN THROUGH MIDNIGHT...THEN RAIN
LIKELY AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 1 TO 3 FEET.
.WEDNESDAY...NORTHEAST WINDS 20 TO 30 KNOTS. RAIN. SNOW LIKELY.
WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.THURSDAY...NORTHEAST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST
15 TO 25 KNOTS. RAIN...POSSIBLY MIXED WITH SNOW...THEN A CHANCE
OF SNOW...POSSIBLY MIXED WITH RAIN. WAVES SUBSIDING TO 2 TO
4 FEET.

$$

LSZ261-231600-
MAFOR 2309/
SUPERIOR WEST 12127 12220 11210 12220 11230. A CHANCE OF RAIN AND
SNOW LATE THIS MORNING AND EARLY THIS AFTERNOON. A CHANCE OF SNOW
AND RAIN IN THE EVENING...THEN CHANCE OF SNOW OVERNIGHT. WAVES 1
TO 3 FEET BUILDING TO 2 TO 4 FEET TODAY. WAVES 2 TO 4 FEET
TONIGHT.

SUPERIOR NORTH CENTRAL 11836 11830 11820 11810 11100 12300 11200.
A CHANCE OF SNOW AND RAIN EARLY THIS MORNING...THEN A CHANCE OF
SNOW THROUGH MID MORNING. A CHANCE OF SNOW AND RAIN AFTER
MIDNIGHT. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET...THEN
SUBSIDING TO 1 TO 3 FEET TODAY. WAVES 2 FEET OR LESS TONIGHT.

SUPERIOR SOUTH CENTRAL 12837 11830 12810 11100 12200. A CHANCE OF
SNOW LATE THIS MORNING. WAVES 2 TO 4 FEET BUILDING TO 3 TO 6
FEET...THEN SUBSIDING TO 2 TO 4 FEET TODAY. WAVES 1 TO 3 FEET
TONIGHT.

SUPERIOR EAST 11836 12830 11820 12710 11800 11110. A CHANCE OF
RAIN EARLY THIS MORNING...THEN A CHANCE OF SNOW THIS MORNING.
A CHANCE OF SNOW AND RAIN LATE TONIGHT. WAVES 2 TO 3 FEET
BUILDING TO 3 TO 6 FEET...THEN SUBSIDING TO 2 TO 4 FEET TODAY.
WAVES 1 TO 3 FEET TONIGHT.

$$

07

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/MQT/GLFTABLE

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.