Great Lakes Forecast
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000
FZUS63 KMQT 180157
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
957 PM EDT WED MAY 17 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...AS A COLD FRONT STALLS OUT JUST TO THE SOUTH OF LAKE
SUPERIOR OVERNIGHT...A 29.3 INCH LOW PRESSURE OVER NORTHWEST IOWA
WILL LIFT NORTHEAST ALONG THIS BOUNDARY TO NEAR THE STRAITS OF
MACKINAC ON THURSDAY WHILE WEAKENING TO 29.6 INCHES. AFTER THIS
LOW MOVES INTO NEW ENGLAND ON FRIDAY...A 30.3 INCH HIGH PRESSURE
OVER SOUTH CENTRAL CANADA ON THURSDAY WILL DRIFT EAST JUST TO THE
NORTH OF LAKE SUPERIOR AND INTO QUEBEC ON SATURDAY. A 29.9 INCH
LOW PRESSURE OVER THE CENTRAL PLAINS FRIDAY NIGHT WILL THEN MOVE
NORTHEAST INTO THE UPPER GREAT LAKES ON SUNDAY AND TO NEAR JAMES
BAY MONDAY.

LSZ162-181000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
957 PM EDT WED MAY 17 2017 /857 PM CDT WED MAY 17 2017/

...GALE WARNING IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NORTHEAST GALES TO 40 KNOTS. PATCHY FOG.
ISOLATED THUNDERSTORMS WITH HEAVY RAINFALL THROUGH LATE EVENING.
RAIN SHOWERS. WAVES 4 TO 7 FEET OCCASIONALLY TO 9 FEET BUILDING
TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
.THURSDAY...NORTH GALES TO 35 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. SCATTERED RAIN SHOWERS THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY NIGHT...WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS THROUGH EARLY
AFTERNOON...THEN RAIN SHOWERS LIKELY BY MID AFTERNOON. WAVES
BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS. RAIN SHOWERS LIKELY
THROUGH MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO CALM TO 2 FEET.
.SUNDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES CALM TO
2 FEET.

$$

LSZ263-181000-
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-
957 PM EDT WED MAY 17 2017

...GALE WARNING IN EFFECT THROUGH THURSDAY AFTERNOON...

.REST OF TONIGHT...NORTHEAST GALES TO 40 KNOTS. PATCHY FOG.
ISOLATED THUNDERSTORMS WITH HEAVY RAINFALL THROUGH LATE EVENING.
RAIN SHOWERS. WAVES 4 TO 7 FEET OCCASIONALLY TO 9 FEET BUILDING
TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
.THURSDAY...NORTH GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS
BY MID AFTERNOON. SCATTERED RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET...THEN
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS THROUGH EARLY
AFTERNOON...THEN RAIN SHOWERS LIKELY BY MID AFTERNOON. WAVES
BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...
THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO
CALM TO 2 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST. WAVES
BUILDING TO 1 TO 3 FEET...THEN SUBSIDING TO CALM TO 2 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO 15 KNOTS.
WAVES BUILDING TO 1 TO 3 FEET...THEN SUBSIDING TO CALM TO 2 FEET.

$$

LSZ264-181000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
957 PM EDT WED MAY 17 2017

...GALE WARNING IN EFFECT THROUGH THURSDAY AFTERNOON...

.REST OF TONIGHT...NORTHEAST GALES TO 40 KNOTS. PATCHY FOG. RAIN
SHOWERS. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET BUILDING TO
9 TO 12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH GALES TO 40 KNOTS. RAIN SHOWERS THROUGH EARLY
AFTERNOON...POSSIBLY MIXED WITH SNOW. ISOLATED RAIN SHOWERS BY
MID AFTERNOON. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18
FEET...THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
.THURSDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS LESS THAN 10 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY BY MID AFTERNOON.
WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 20 TO 30 KNOTS BECOMING SOUTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SUNDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST. WAVES
SUBSIDING TO CALM TO 2 FEET...THEN 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.

$$

LSZ265-181000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
957 PM EDT WED MAY 17 2017

...GALE WARNING IN EFFECT FROM 4 AM EDT THURSDAY THROUGH THURSDAY
AFTERNOON...

.REST OF TONIGHT...NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. PATCHY FOG. RAIN SHOWERS AND
SCATTERED THUNDERSTORMS. SOME THUNDERSTORMS MAY PRODUCE HEAVY
RAINFALL. WAVES 2 TO 4 FEET BUILDING TO 8 TO 11 FEET OCCASIONALLY
TO 14 FEET.
.THURSDAY...NORTH GALES TO 40 KNOTS. RAIN SHOWERS THROUGH EARLY
AFTERNOON...THEN SCATTERED RAIN SHOWERS BY MID AFTERNOON. WAVES
BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET...THEN
SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.THURSDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY BY MID AFTERNOON.
WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...THEN A
CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET.
.SUNDAY...WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS.
WAVES SUBSIDING TO CALM TO 2 FEET...THEN BUILDING TO 1 TO 3 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO CALM
TO 2 FEET.

$$

LSZ266-181000-
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-
957 PM EDT WED MAY 17 2017

...GALE WARNING IN EFFECT FROM 4 AM EDT THURSDAY THROUGH THURSDAY
AFTERNOON...

.REST OF TONIGHT...NORTHEAST GALES TO 40 KNOTS. AREAS OF FOG.
RAIN SHOWERS AND SCATTERED THUNDERSTORMS. SOME THUNDERSTORMS MAY
PRODUCE HEAVY RAINFALL. WAVES 2 TO 4 FEET BUILDING TO 9 TO
12 FEET OCCASIONALLY TO 15 FEET.
.THURSDAY...NORTH GALES TO 40 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. NUMEROUS RAIN SHOWERS THROUGH EARLY AFTERNOON...THEN
SCATTERED RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 10 TO
14 FEET OCCASIONALLY TO 18 FEET...THEN SUBSIDING TO 7 TO 10 FEET
OCCASIONALLY TO 13 FEET.
.THURSDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...NORTH WINDS 5 TO 15 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...THEN A
CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO
4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.SUNDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST. WAVES
BUILDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET...
THEN SUBSIDING TO 1 TO 3 FEET.

$$

LSZ267-181000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
957 PM EDT WED MAY 17 2017

...GALE WARNING IN EFFECT FROM 8 AM EDT THURSDAY THROUGH THURSDAY
EVENING...

.REST OF TONIGHT...EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS AFTER MIDNIGHT. AREAS OF FOG. RAIN SHOWERS AND SCATTERED
THUNDERSTORMS. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL.
WAVES CALM TO 2 FEET BUILDING TO 5 TO 8 FEET OCCASIONALLY TO
10 FEET.
.THURSDAY...NORTHEAST GALES TO 40 KNOTS BACKING NORTH BY MID
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. NUMEROUS RAIN
SHOWERS THROUGH EARLY AFTERNOON...THEN SCATTERED RAIN SHOWERS BY
MID AFTERNOON. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO
14 FEET...THEN SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
.THURSDAY NIGHT...NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 20 TO 30 KNOTS. RAIN SHOWERS
LIKELY THROUGH MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER
MIDNIGHT. WAVES 1 TO 3 FEET.
.SUNDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST. A CHANCE
OF RAIN SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET...THEN
BUILDING TO 2 TO 4 FEET.
.MONDAY...WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.

$$
LSZ261-181000-
MAFOR 1803/
SUPERIOR WEST...GALE WARNING IN EFFECT...14156 11850 11130 11400
11500. PATCHY FOG OVERNIGHT. SCATTERED RAIN SHOWERS LATE THURSDAY
MORNING. WAVES 5 TO 8 FEET BUILDING TO 7 TO 10 FEET OVERNIGHT.
WAVES 6 TO 10 FEET THURSDAY. WAVES 3 TO 6 FEET THURSDAY EVENING.

SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11150 11156
12166 11860 11850 11830 11810. PATCHY FOG THROUGH EARLY THURSDAY
MORNING. SCATTERED RAIN SHOWERS LATE THIS EVENING AND EARLY
THURSDAY AFTERNOON. WAVES 4 TO 6 FEET BUILDING TO 8 TO 11 FEET
OVERNIGHT. WAVES 9 TO 13 FEET SUBSIDING TO 8 TO 11 FEET THURSDAY.
WAVES 2 TO 6 FEET THURSDAY EVENING.

SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11136 11146
11156 12856 12850 11830. PATCHY FOG THROUGH THURSDAY MORNING.
SCATTERED THUNDERSTORMS LATE THIS EVENING. WAVES 2 TO 4 FEET
BUILDING TO 6 TO 9 FEET OVERNIGHT. WAVES 8 TO 11 FEET BUILDING TO
10 TO 13 FEET THURSDAY. WAVES 7 TO 10 FEET SUBSIDING TO 4 TO 6
FEET THURSDAY EVENING.

SUPERIOR EAST...GALE WARNING IN EFFECT...11146 11246 13156 12850
11840. PATCHY FOG THROUGH THURSDAY MORNING. SCATTERED
THUNDERSTORMS OVERNIGHT. SCATTERED RAIN SHOWERS LATE THURSDAY.
WAVES 1 TO 3 FEET BUILDING TO 5 TO 8 FEET OVERNIGHT. WAVES 7 TO 11
FEET THURSDAY. WAVES 6 TO 9 FEET SUBSIDING TO 3 TO 6 FEET
THURSDAY EVENING.

$$

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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