Great Lakes Forecast
Issued by NWS

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858
FZUS61 KBUF 212037
GLFLO

GLFLO

OPEN LAKE FORECAST FOR LAKE ONTARIO
NATIONAL WEATHER SERVICE BUFFALO NY
430 PM 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.

LOZ062-220300-
LAKE ONTARIO OPEN WATERS FROM THE NIAGARA RIVER TO HAMLIN BEACH-
430 PM EDT SUN MAY 21 2017

.TONIGHT...SOUTH WINDS 15 TO 20 KNOTS DIMINISHING TO 5 TO
10 KNOTS. SHOWERS WITH A CHANCE OF THUNDERSTORMS. WAVES 1 TO
3 FEET.
.MONDAY...SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
EARLY. 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.
.TUESDAY NIGHT...EAST WINDS 5 TO 10 KNOTS. WAVES 1 FOOT OR LESS.
.WEDNESDAY...EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST. A
CHANCE OF SHOWERS DURING THE DAY...THEN SHOWERS LIKELY WEDNESDAY
NIGHT. WAVES 2 FEET OR LESS.
.THURSDAY...SOUTH WINDS 5 TO 10 KNOTS BECOMING WEST. SHOWERS
LIKELY. WAVES 1 FOOT OR LESS.
.FRIDAY...WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST. A CHANCE
OF SHOWERS DURING THE DAY. WAVES 2 FEET OR LESS.

WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.

$$

LOZ063>065-220300-
LAKE ONTARIO OPEN WATERS FROM HAMLIN BEACH TO THE SAINT LAWRENCE
RIVER-
430 PM EDT SUN MAY 21 2017

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

WINDS AND WAVES HIGHER IN AND NEAR THUNDERSTORMS.

$$

LOZ061-220200-
MAFOR 2121/
ONTARIO WEST 1/2 12426 11316 11406 12500 11600 11610. A CHANCE OF
THUNDERSTORMS TONIGHT. A CHANCE OF SHOWERS MONDAY MORNING. WAVES
1 TO 3 FEET TONIGHT. WAVES 1 FOOT OR LESS MONDAY.

ONTARIO EAST 1/2 14426 11416 11410 11400 11510. A CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY THIS EVENING...THEN A CHANCE OF
THUNDERSTORMS TONIGHT. A CHANCE OF THUNDERSTORMS IN THE MORNING...
THEN A CHANCE OF SHOWERS MONDAY AFTERNOON. WAVES 1 TO 3 FEET.

$$



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