Great Lakes Forecast
Issued by NWS

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000
FZUS61 KBUF 211445
GLFLO

OPEN LAKE FORECAST FOR LAKE ONTARIO
NATIONAL WEATHER SERVICE BUFFALO NY
1045 AM EDT SUN MAY 21 2017

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON LAKE ONTARIO

WAVES ARE THE SIGNIFICANT WAVE HEIGHT - THE AVERAGE OF THE HIGHEST
1/3 OF THE WAVE SPECTRUM. OCCASIONAL WAVE HEIGHT IS THE AVERAGE OF
THE HIGHEST 1/10 OF THE WAVE SPECTRUM.

.SYNOPSIS...A 29.7 INCH LOW OVER THE UPPER MISSISSIPPI VALLEY
WILL TRACK ACROSS LAKE SUPERIOR BY LATE TONIGHT. THE LOW WILL
DEEPEN TO 29.6 INCHES AS IT TRACKS TO NEAR JAMES BAY BY MONDAY
WHILE PUSHING A COLD FRONT ACROSS LAKE ONTARIO TONIGHT, FOLLOWED
BY WEAK RIDGING ACROSS THE LAKE MONDAY AND TUESDAY. A BROAD 29.5
INCH LOW WILL THEN GRADUALLY MOVE ACROSS THE LOWER GREAT LAKES
ON WEDNESDAY INTO THURSDAY.

LOZ062-212115-
LAKE ONTARIO OPEN WATERS FROM THE NIAGARA RIVER TO HAMLIN BEACH-
1045 AM EDT SUN MAY 21 2017

.REST OF TODAY...EAST WINDS 15 TO 20 KNOTS. SHOWERS WITH A CHANCE
OF THUNDERSTORMS. WAVES 1 TO 3 FEET.
.TONIGHT...SOUTHEAST WINDS 10 TO 15 KNOTS BECOMING SOUTH. SHOWERS
WITH A CHANCE OF THUNDERSTORMS EARLY...THEN SHOWERS FROM LATE
EVENING ON. WAVES 1 TO 3 FEET.
.MONDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. SHOWERS LIKELY IN THE
MORNING. WAVES 1 FOOT OR LESS.
.MONDAY NIGHT...SOUTHWEST WINDS 10 TO 15 KNOTS. WAVES 1 TO
2 FEET.
.TUESDAY...SOUTHWEST WINDS 10 KNOTS OR LESS BECOMING SOUTHEAST.
WAVES 1 FOOT OR LESS.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
DURING THE DAY...THEN SHOWERS LIKELY WEDNESDAY NIGHT. WAVES
1 FOOT OR LESS.
.THURSDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING WEST. SHOWERS
LIKELY. WAVES 2 FEET OR LESS.

WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.

$$

LOZ063>065-212115-
LAKE ONTARIO OPEN WATERS FROM HAMLIN BEACH TO THE SAINT LAWRENCE
RIVER-
1045 AM EDT SUN MAY 21 2017

.REST OF TODAY...SOUTHEAST WINDS 10 TO 15 KNOTS INCREASING TO
15 TO 20 KNOTS. SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS
LATE THIS MORNING...THEN A CHANCE OF SHOWERS AND THUNDERSTORMS
EARLY THIS AFTERNOON. OCCASIONAL SHOWERS WITH A CHANCE OF
THUNDERSTORMS LATE. WAVES 1 TO 3 FEET.
.TONIGHT...SOUTHEAST WINDS 15 TO 25 KNOTS. SHOWERS WITH A CHANCE
OF THUNDERSTORMS EARLY...THEN SHOWERS FROM LATE EVENING ON. WAVES
2 FEET OR LESS BUILDING TO 2 TO 4 FEET.
.MONDAY...SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST AND
DIMINISHING TO 5 TO 15 KNOTS. SHOWERS IN THE MORNING...THEN A
CHANCE OF SHOWERS IN THE AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING
TO 1 FOOT OR LESS.
.MONDAY NIGHT...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH.
WAVES 2 FEET OR LESS.
.TUESDAY...SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST.
WAVES 1 FOOT OR LESS.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
DURING THE DAY...THEN SHOWERS LIKELY WEDNESDAY NIGHT. WAVES
1 FOOT OR LESS.
.THURSDAY...SOUTH WINDS 5 TO 15 KNOTS BECOMING WEST. SHOWERS
LIKELY. WAVES 2 FEET OR LESS.

WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.

$$

LOZ061-212115-
MAFOR 2115/
ONTARIO WEST 1/2 11220 11226 11216 13316 11416 11500. A CHANCE OF
THUNDERSTORMS THIS AFTERNOON AND EVENING. A CHANCE OF SHOWERS
MONDAY MORNING. WAVES 1 TO 3 FEET THIS AFTERNOON AND TONIGHT.
WAVES 2 FEET OR LESS MONDAY MORNING.

ONTARIO EAST 1/2 13320 11316 11326 12336 11420. A CHANCE OF
SHOWERS AND THUNDERSTORMS THIS AFTERNOON. A CHANCE OF
THUNDERSTORMS THIS EVENING. A CHANCE OF SHOWERS MONDAY MORNING.
WAVES 1 TO 3 FEET THIS AFTERNOON. WAVES 2 FEET OR LESS BUILDING
TO 2 TO 4 FEET TONIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3
FEET MONDAY MORNING.

$$



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