Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 211321
GLFLS

OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
921 AM EDT THU JUL 21 2016

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR

.SYNOPSIS...A 30.3 INCH HIGH PRESSURE ACROSS THE MID ATLANTIC STATES
WILL MOVE TO THE SOUTHEAST UNITED STATES THROUGH FRIDAY. A LOW
PRESSURE TROUGH OF 29.7 INCHES FROM NORTHERN MANITOBA TO THE NORTHERN
HIGH PLAINS WILL DRIFT EASTWARD...CROSSING THE UPPER GREAT LAKES THIS
EVENING AND QUEBEC AND NEW ENGLAND ON FRIDAY. A WEAK 30.0 INCH RIDGE
WILL THEN BUILD OVER THE UPPER GREAT LAKES ON FRIDAY AND THEN SLIDE
ACROSS THE LOWER GREAT LAKES ON SATURDAY AS A 29.7 INCH TROUGH OF LOW
PRESSURE MOVES IN FROM THE DAKOTAS SATURDAY NIGHT INTO SUNDAY. THIS
TROUGH WILL CROSS THE UPPER GREAT LAKES ON MONDAY AS A HIGH PRESSURE
RIDGE OF 30.0 INCHES MOVES FROM THE NORTHERN PLAINS TO THE UPPER
MISSISSIPPI RIVER VALLEY.

LSZ162-212130-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
921 AM EDT THU JUL 21 2016 /821 AM CDT THU JUL 21 2016/

.REST OF TODAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST BY
MID AFTERNOON. ISOLATED SHOWERS AND THUNDERSTORMS THROUGH LATE
MORNING. WIDESPREAD FOG LATE THIS MORNING...THEN AREAS OF FOG BY MID
AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG. WAVES SUBSIDING
TO CALM TO 2 FEET.
.FRIDAY...SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST BY MID
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES CALM TO
2 FEET.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS
THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS
BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
AND THUNDERSTORMS THROUGH MIDNIGHT...THEN SHOWERS AND
THUNDERSTORMS LIKELY AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT.
WAVES CALM TO 2 FEET.
.SUNDAY...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS.
PATCHY FOG. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO
2 FEET.
.MONDAY...WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ263-212130-
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-
921 AM EDT THU JUL 21 2016

.REST OF TODAY...SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST BY
MID AFTERNOON. WIDESPREAD FOG LATE THIS MORNING. AREAS OF FOG BY MID
AFTERNOON. ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET
BUILDING TO 2 TO 4 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS. AREAS OF FOG. WAVES
SUBSIDING TO CALM TO 2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
BY MID AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES
BUILDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST LESS
THAN 10 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH
MIDNIGHT...THEN SHOWERS AND THUNDERSTORMS LIKELY AFTER MIDNIGHT.
PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET...THEN
SUBSIDING TO CALM TO 2 FEET.
.MONDAY...WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ264-212130-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
921 AM EDT THU JUL 21 2016

.REST OF TODAY...SOUTHWEST WINDS 10 TO 20 KNOTS. WIDESPREAD FOG.
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET BUILDING
TO 2 TO 4 FEET.
.TONIGHT...WEST WINDS 10 TO 20 KNOTS. PATCHY FOG. WAVES SUBSIDING
TO CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
.SATURDAY...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. PATCHY FOG
AFTER MIDNIGHT. SHOWERS AND THUNDERSTORMS LIKELY AFTER MIDNIGHT.
WAVES CALM TO 2 FEET.
.SUNDAY...SOUTHEAST WINDS 5 TO 15 KNOTS VEERING WEST. PATCHY FOG.
A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ265-212130-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
921 AM EDT THU JUL 21 2016

.REST OF TODAY...SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST
5 TO 15 KNOTS BY MID AFTERNOON. PATCHY FOG. SCATTERED SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
AFTER MIDNIGHT. PATCHY FOG. WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. WAVES CALM TO 2 FEET.
.FRIDAY NIGHT...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 10 TO 20 KNOTS. SHOWERS AND
THUNDERSTORMS LIKELY AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING WEST. A CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.

$$

LSZ266-212130-
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-
921 AM EDT THU JUL 21 2016

...SEVERE THUNDERSTORM WATCH 404 IN EFFECT UNTIL NOON EDT TODAY...

.REST OF TODAY...SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
5 TO 15 KNOTS BY MID AFTERNOON. PATCHY FOG LATE THIS MORNING.
WIDESPREAD FOG BY MID AFTERNOON. NUMEROUS SHOWERS AND THUNDERSTORMS
LATE THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS THIS AFTERNOON.
SOME THUNDERSTORMS MAY BE SEVERE WITH WIND GUSTS OVER 35 KNOTS AND
LARGE HAIL THROUGH LATE MORNING. WAVES 1 TO 3 FEET BUILDING TO 2 TO
4 FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
THROUGH MIDNIGHT. AREAS OF FOG. WAVES SUBSIDING TO CALM TO
2 FEET.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
.FRIDAY NIGHT...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
.SATURDAY...NORTH WINDS LESS THAN 10 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND
THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING WEST. PATCHY
FOG. SHOWERS AND THUNDERSTORMS LIKELY. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ267-212130-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
921 AM EDT THU JUL 21 2016

...SEVERE THUNDERSTORM WATCH 404 IN EFFECT UNTIL NOON EDT TODAY...

.REST OF TODAY...SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST BY
MID AFTERNOON. AREAS OF FOG INTO EARLY AFTERNOON. WIDESPREAD FOG BY
MID AFTERNOON. NUMEROUS SHOWERS AND THUNDERSTORMS LATE THIS MORNING.
SCATTERED SHOWERS AND THUNDERSTORMS THIS AFTERNOON. SOME
THUNDERSTORMS MAY BE SEVERE WITH WIND GUSTS OVER 35 KNOTS AND LARGE
HAIL THROUGH LATE MORNING. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO 2
FEET.
.TONIGHT...WEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS THROUGH MIDNIGHT. WIDESPREAD FOG THROUGH
MIDNIGHT...THEN PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
.FRIDAY...WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES CALM
TO 2 FEET.
.FRIDAY NIGHT...WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SATURDAY...NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
.SATURDAY NIGHT...EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
.SUNDAY...SOUTHEAST WINDS 10 TO 20 KNOTS VEERING WEST. PATCHY
FOG. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES BUILDING TO
1 TO 3 FEET.
.MONDAY...WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES
SUBSIDING TO CALM TO 2 FEET.

$$

LSZ261-212130-
MAFOR 2115/
SUPERIOR WEST 12513 12613 11603 12600 11500. PATCHY FOG OVERNIGHT
AND FRIDAY MORNING. WAVES 1 TO 3 FEET.

SUPERIOR NORTH CENTRAL 11513 11523 11623 11620 14610. PATCHY FOG
FROM LATE EVENING ON TONIGHT. PATCHY FOG FRIDAY MORNING. WAVES 1
TO 4 FEET.

SUPERIOR SOUTH CENTRAL...SEVERE THUNDERSTORM WATCH IN EFFECT...
11510 19519 11510 12610 11600 13610. PATCHY FOG TONIGHT AND FRIDAY
MORNING. WAVES 1 TO 2 FEET.

SUPERIOR EAST...SEVERE THUNDERSTORM WATCH IN EFFECT...12513 19519
11513 11613 11603 11600 12610. SCATTERED SHOWERS AND THUNDERSTORMS
THIS AFTERNOON THROUGH EARLY EVENING TONIGHT. PATCHY FOG OVERNIGHT.
PATCHY FOG FRIDAY MORNING. WAVES 1 TO 3 FEET.

$$

KC



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