Great Lakes Forecast
Issued by NWS

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FZUS63 KMQT 032004
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
404 PM EDT SUN MAY 3 2015

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A 29.3 INCH LOW PRESSURE OVER SOUTHERN HUDSON BAY WILL
MOVE INTO FAR NORTHERN QUEBEC TONIGHT AND DRAG A TROUGH AVERAGING
29.8 INCHES OVER LAKE SUPERIOR. IN THE WAKE OF THIS TROUGH...30.2
INCH HIGH PRESSURE WILL BUILD OVER THE UPPER LAKES ON MONDAY. EXPECT
THIS HIGH TO DRIFT INTO SOUTHEAST ONTARIO LATER TUESDAY INTO
WEDNESDAY...AS ANOTHER 30.4 INCH AREA OF HIGH PRESSURE MOVES INTO
NORTHWEST ONTARIO AND A 29.6 INCH LOW PRESSURE TROUGH TAKES SHAPE
OVER THE PLAINS. A 29.5 INCH LOW PRESSURE CENTER EMERGING FROM THIS
TROUGH WILL MOVE THROUGH THE NORTHERN PLAINS ON THURSDAY WHILE THE
ONTARIO HIGH DRIFTS ACROSS HUDSON BAY INTO QUEBEC. THE LOW WILL DRAG
A TROUGH AVERAGING 29.8 INCHES ACROSS THE UPPER GREAT LAKES REGION
THURSDAY NIGHT THROUGH FRIDAY.

LSZ162-040415-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG.
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.MONDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.MONDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS
THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.TUESDAY...EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...EAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN SHOWERS.
WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...EAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST
5 TO 15 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES
CALM TO 2 FEET.
.THURSDAY...SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. SHOWERS
LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. WAVES CALM TO
2 FEET.

$$

LSZ263-040415-
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-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG.
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT. PATCHY FOG THROUGH MIDNIGHT. ISOLATED
SHOWERS AND THUNDERSTORMS THROUGH MIDNIGHT. WAVES BUILDING TO
1 TO 3 FEET.
.MONDAY...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TUESDAY...SOUTH WINDS LESS THAN 10 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.WEDNESDAY...EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH
5 TO 15 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES
CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN SHOWERS.
A CHANCE OF THUNDERSTORMS. RAIN SHOWERS LIKELY. WAVES CALM TO
2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO 15 KNOTS.
A CHANCE OF THUNDERSTORMS. A CHANCE OF RAIN SHOWERS. WAVES CALM
TO 2 FEET.

$$

LSZ264-040415-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...SOUTHWEST WINDS 5 TO 15 KNOTS. PATCHY FOG.
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
AFTER MIDNIGHT. ISOLATED SHOWERS AND THUNDERSTORMS THROUGH
MIDNIGHT. PATCHY FOG. WAVES BUILDING TO 1 TO 3 FEET.
.MONDAY...WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
.MONDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TUESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF
RAIN SHOWERS. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN SHOWERS.
RAIN SHOWERS LIKELY. WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTH. A CHANCE OF
THUNDERSTORMS. A CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.

$$

LSZ265-040415-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...SOUTH WINDS 5 TO 15 KNOTS. SCATTERED
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO
20 KNOTS AFTER MIDNIGHT. SCATTERED SHOWERS AND THUNDERSTORMS
THROUGH MIDNIGHT. PATCHY FOG. WAVES BUILDING TO 1 TO 3 FEET.
.MONDAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
.MONDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN SHOWERS.
WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. A CHANCE OF THUNDERSTORMS. A CHANCE OF RAIN SHOWERS.
WAVES CALM TO 2 FEET.

$$

LSZ266-040415-
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-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...SOUTH WINDS 5 TO 15 KNOTS. SCATTERED
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO
20 KNOTS AFTER MIDNIGHT. SCATTERED SHOWERS AND THUNDERSTORMS
THROUGH MIDNIGHT. AREAS OF FOG. WAVES BUILDING TO 1 TO 3 FEET.
.MONDAY...NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. PATCHY FOG. WAVES BUILDING TO 2 TO
4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.MONDAY NIGHT...WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY...SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN SHOWERS.
WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING
TO CALM TO 2 FEET.

$$

LSZ267-040415-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
404 PM EDT SUN MAY 3 2015

.LATE THIS AFTERNOON...SOUTH WINDS 10 TO 20 KNOTS. AREAS OF FOG.
SCATTERED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO
20 KNOTS AFTER MIDNIGHT. AREAS OF FOG. SCATTERED SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.
.MONDAY...NORTHWEST WINDS 10 TO 20 KNOTS. AREAS OF FOG. WAVES
BUILDING TO 2 TO 4 FEET...THEN SUBSIDING TO 1 TO 3 FEET.
.MONDAY NIGHT...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG THROUGH
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.TUESDAY...SOUTHEAST WINDS LESS THAN 10 KNOTS BACKING EAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.WEDNESDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
.THURSDAY...SOUTH WINDS 10 TO 20 KNOTS. RAIN SHOWERS LIKELY.
WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING
TO CALM TO 2 FEET.

NOTE...WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.

$$

LSZ261-040415-
MAFOR 0321/

SUPERIOR WEST 11600 11610 14710 11610 11510. ISOLATED SHOWERS AND
THUNDERSTORMS EARLY. WAVES 1 TO 3 FEET.

SUPERIOR NORTH CENTRAL 11510 11503 12610 11620 11710 12610. SCATTERED
EVENING SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FEET.

SUPERIOR SOUTH CENTRAL 11319 11500 11510 13610 12710. SCATTERED RAIN
SHOWERS AND THUNDERSTORMS THIS EVENING. WAVES 1 TO 3 FEET.

SUPERIOR EAST 11410 11419 11503 11610 12710 12720. SCATTERED RAIN
SHOWERS AND THUNDERSTORMS THROUGH TONIGHT. WAVES 1 TO 4 FEET.

$$

JS



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