Great Lakes Forecast
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910
FZUS61 KBUF 211736
GLFLO

Open Lake Forecast for Lake Ontario
National Weather Service Buffalo NY
136 PM EDT Mon Aug 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 30.1 inch high will move off the mid-Atlantic coast
through Tuesday. A strong cold front, averaging 29.6 inches, will
then cross Lake Ontario Tuesday night. On Wednesday a 30.1 inch
high will ridge from the Upper Plains to western Ontario province,
and then expand into the Great Lakes region on Thursday.

LOZ062-212115-
Lake Ontario open waters from the Niagara River to Hamlin Beach-
136 PM EDT Mon Aug 21 2017

.THIS AFTERNOON...Southwest winds less than 10 knots becoming
west. Waves 1 foot or less.
.TONIGHT...Southwest winds 5 to 10 knots becoming south. A chance
of showers and thunderstorms late. Waves 1 foot or less.
.TUESDAY...Southwest winds 15 to 25 knots. A chance of showers
and thunderstorms in the morning...then showers and thunderstorms
likely in the afternoon. Some thunderstorms may be severe with
strong winds in the afternoon. Waves 1 to 3 feet building to 3 to
5 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots. A chance of showers
in the evening. Waves 3 to 6 feet.
.WEDNESDAY...West winds 15 to 20 knots becoming north. A chance
of waterspouts during the day. A chance of showers. Waves 3 to
5 feet.
.THURSDAY...North winds 10 to 15 knots. A chance of showers
during the day. Waves 2 to 3 feet.
.FRIDAY...North winds 10 knots or less. 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-
136 PM EDT Mon Aug 21 2017

.THIS AFTERNOON...West winds 5 to 10 knots becoming south. Waves
2 feet or less.
.TONIGHT...South winds 5 to 15 knots. Waves 2 feet or less.
.TUESDAY...South winds 15 to 25 knots becoming southwest. A
chance of showers and thunderstorms in the morning...then showers
and thunderstorms in the afternoon. Some thunderstorms may be
severe with strong winds in the afternoon. Waves 1 to 3 feet
building to 3 to 5 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming west.
Showers and thunderstorms in the evening. Some thunderstorms may
be severe with strong winds. Waves 4 to 7 feet. Waves
occasionally around 9 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest. A
chance of waterspouts during the day. A chance of showers. Waves
4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around
9 feet.
.THURSDAY...North winds 10 to 15 knots. A chance of showers
during the day. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.FRIDAY...North winds 5 to 10 knots becoming northwest. Waves
2 feet or less.

Winds and waves higher in and near thunderstorms.

$$

LOZ061-212115-
MAFOR 2115/
ONTARIO WEST 1/2 11500 11600 11500 13400 11410 11520. A chance of
showers and thunderstorms Tuesday morning. Waves 1 foot or less
this afternoon and tonight. Waves 1 to 3 feet Tuesday morning.

ONTARIO EAST 1/2 11510 11400 11300 12400 12410 11420. A chance of
showers and thunderstorms Tuesday morning. Waves 2 feet or less
this afternoon and tonight. Waves 1 to 3 feet Tuesday morning.

$$



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