Great Lakes Forecast
Issued by NWS

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FZUS63 KMQT 310120
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
920 PM EDT MON MAR 30 2015

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A WEAK 30.0 INCH HIGH PRESSURE RIDGE FROM WESTERN ONTARIO
TO SOUTHERN LOWER MICHIGAN WILL SLIDE EASTWARD OVERNIGHT. A 29.8
INCH LOW PRESSURE OVER WISCONSIN WILL REACH THE LOWER GREAT LAKES ON
TUESDAY. EXPECT A 30.0 INCH HIGH PRESSURE RIDGE TO BUILD OVER THE
WESTERN GREAT LAKES LATER ON TUESDAY. A 29.4 INCH LOW PRESSURE OVER
SOUTH CENTRAL CANADA ON WEDNESDAY MORNING WILL MOVE ACROSS NORTHWEST
ONTARIO AND REACH FAR NORTHWEST QUEBEC BY THURSDAY EVENING...
DRAGGING A LOW PRESSURE TROUGH ACROSS THE UPPER GREAT LAKES EARLY ON
THURSDAY AND A COLD FRONT OVER THE SAME AREA ON THURSDAY NIGHT. A
30.4 INCH HIGH PRESSURE WILL MOVE INTO THE NORTHERN PLAINS ON FRIDAY
AND EXTEND A RIDGE INTO THE UPPER GREAT LAKES. A WEAK 30.0 INCH
TROUGH WILL MOVE EAST ACROSS THE UPPER GREAT LAKES ON SATURDAY.

LSZ162-310930-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST
LESS THAN 10 KNOTS AFTER MIDNIGHT. ISOLATED RAIN AND SNOW SHOWERS
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.TUESDAY...WEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST BY MID
AFTERNOON. SCATTERED SNOW SHOWERS...POSSIBLY MIXED WITH RAIN.
WAVES CALM TO 2 FEET.
.TUESDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.WEDNESDAY...EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF FREEZING RAIN AND
SNOW SHOWERS THROUGH EARLY AFTERNOON. A CHANCE OF RAIN SHOWERS.
PATCHY FOG BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.WEDNESDAY NIGHT...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST
AFTER MIDNIGHT. PATCHY FOG THROUGH MIDNIGHT. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES CALM
TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST.
WAVES CALM TO 2 FEET.

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

$$

LSZ263-310930-
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-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS. ISOLATED SNOW
SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.TUESDAY...EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. ISOLATED RAIN SHOWERS THROUGH EARLY AFTERNOON.
SCATTERED SNOW SHOWERS. 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 INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF FREEZING RAIN
THROUGH EARLY AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW. PATCHY FOG BY MID AFTERNOON. WAVES BUILDING TO
1 TO 3 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 15 TO 25 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. PATCHY FOG. A CHANCE OF RAIN SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO
25 KNOTS BY MID AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON.
WAVES BUILDING TO 2 TO 4 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTH AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

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

$$

LSZ264-310930-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...SOUTHEAST WINDS LESS THAN 10 KNOTS INCREASING
TO 5 TO 15 KNOTS AFTER MIDNIGHT. ISOLATED SNOW SHOWERS AFTER
MIDNIGHT.
.TUESDAY...EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. SCATTERED SNOW SHOWERS.
.TUESDAY NIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT.
.WEDNESDAY...SOUTHEAST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF FREEZING RAIN
THROUGH EARLY AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW.
.WEDNESDAY NIGHT...SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. PATCHY FOG. RAIN SHOWERS LIKELY THROUGH MIDNIGHT.
A SLIGHT CHANCE OF RAIN SHOWERS AFTER MIDNIGHT.
.THURSDAY...WEST WINDS 10 TO 20 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTH AFTER
MIDNIGHT.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS.
.SATURDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS.

NOTE...WAVES OMITTED FOR MOSTLY ICE COVERED AREAS.

$$

LSZ265-310930-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. ISOLATED SNOW SHOWERS AFTER MIDNIGHT. WAVES CALM
TO 2 FEET.
.TUESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO
20 KNOTS BY MID AFTERNOON. ISOLATED SNOW SHOWERS. WAVES CALM TO
2 FEET.
.TUESDAY NIGHT...EAST WINDS LESS THAN 10 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.WEDNESDAY NIGHT...SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH
MIDNIGHT...THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES
SUBSIDING TO CALM TO 2 FEET.
.THURSDAY...WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET...THEN SUBSIDING TO
CALM TO 2 FEET.
.FRIDAY...NORTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 15 TO 25 KNOTS BECOMING EAST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

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

$$

LSZ266-310930-
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-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...NORTH WINDS LESS THAN 10 KNOTS BECOMING EAST
5 TO 15 KNOTS AFTER MIDNIGHT.
.TUESDAY...EAST WINDS 5 TO 15 KNOTS. ISOLATED SNOW SHOWERS.
.TUESDAY NIGHT...NORTHEAST WINDS LESS THAN 10 KNOTS VEERING
SOUTHEAST AFTER MIDNIGHT.
.WEDNESDAY...SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 20 TO
30 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS...POSSIBLY
MIXED WITH SNOW BY MID AFTERNOON.
.WEDNESDAY NIGHT...SOUTH GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. RAIN SHOWERS LIKELY THROUGH MIDNIGHT...
THEN A CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. PATCHY FOG AFTER
MIDNIGHT.
.THURSDAY...WEST WINDS 10 TO 20 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON.
.THURSDAY NIGHT...WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST
20 TO 30 KNOTS AFTER MIDNIGHT.
.FRIDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS.
.SATURDAY...NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTH 5 TO
15 KNOTS.

NOTE...WAVES OMITTED FOR MOSTLY ICE COVERED AREAS.

$$

LSZ267-310930-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
920 PM EDT MON MAR 30 2015

.REST OF TONIGHT...NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH
AFTER MIDNIGHT.
.TUESDAY...EAST WINDS 5 TO 15 KNOTS. ISOLATED SNOW SHOWERS.
.TUESDAY NIGHT...NORTH WINDS LESS THAN 10 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A CHANCE OF SNOW SHOWERS...POSSIBLY
MIXED WITH RAIN BY MID AFTERNOON.
.WEDNESDAY NIGHT...SOUTH WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF
SNOW SHOWERS THROUGH MIDNIGHT. RAIN SHOWERS. PATCHY FOG AFTER
MIDNIGHT.
.THURSDAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST BY MID
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. A CHANCE OF RAIN
SHOWERS THROUGH EARLY AFTERNOON.
.THURSDAY NIGHT...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT.
.FRIDAY...NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS.
.SATURDAY...NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO
15 KNOTS. A CHANCE OF SNOW SHOWERS.

NOTE...WAVES OMITTED FOR MOSTLY ICE COVERED AREAS.

$$

LSZ261-310930-
MAFOR 3103/
SUPERIOR WEST 12300 12400 11700 11810 11110 11210. SCATTERED SNOW
SHOWERS TUESDAY MORNING. WAVES 1 FOOT OR LESS.

SUPERIOR NORTH CENTRAL 13300 11310 12210 11110 11200. SCATTERED
SNOW SHOWERS EARLY TUESDAY AFTERNOON. WAVES OMITTED FOR MOSTLY
ICE COVERED AREAS.

SUPERIOR SOUTH CENTRAL 12200 13300 12200 11100. WAVES 1 FOOT OR
LESS.

SUPERIOR EAST 12800 11100 13200 11100 11800. WAVES OMITTED FOR
MOSTLY ICE COVERED AREAS.

$$

PETRO


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