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Latest Great Lakes Marine Forecast by KBUF
Issued 5/7/2026 4:03 PM America/New_York.
Valid through 5/7/2026 11:00 PM America/New_York.
fzus61 kbuf 072003
glfsl
expires:202605080300;;180747
forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu may 7 2026
slz022-024-080300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu may 7 2026
.tonight...southwest winds 10 knots or less becoming west. partly
to mostly cloudy.
.friday...west winds 10 knots or less becoming southwest 10 to
15 knots. mostly sunny.
.friday night...southwest winds 10 knots or less becoming south.
mainly clear.
.saturday...south winds 5 to 10 knots. mostly sunny.
.saturday night...south winds 5 to 15 knots becoming southwest.
showers likely.
.sunday...southwest winds 5 to 15 knots becoming west less than
10 knots. a chance of rain showers during the day.
.monday...west winds 10 knots or less becoming northwest. a
chance of rain showers.
.tuesday...northwest winds less than 10 knots. partly cloudy.
$$
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Latest Great Lakes Marine Forecast by KBUF
Issued 5/7/2026 4:02 PM America/New_York.
Valid through 5/7/2026 11:00 PM America/New_York.
fzus61 kbuf 072002
glflo
expires:202605080300;;180730
open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu may 7 2026
for waters beyond five nautical miles of shore on lake ontario
waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.
.synopsis...a broad area of high pressure averaging 29.8 inches will
build from the ohio valley tonight to off the mid atlantic coast by
friday night. a 29.5 inch low will then move from the upper great
lakes saturday to central quebec sunday before weakening over
northern quebec monday. a 30.3 inch high is then forecast to build
from northwest ontario province monday to the central great lakes
tuesday.
loz063>065-080300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu may 7 2026
.tonight...west winds 5 to 15 knots. a chance of showers. waves
2 feet or less.
.friday...west winds 5 to 15 knots becoming southwest. waves
2 feet or less.
.friday night...south winds 5 to 10 knots. waves 2 feet or less.
.saturday...south winds 5 to 15 knots becoming southeast. a
chance of showers in the afternoon. waves 2 feet or less.
.saturday night...south winds 10 to 15 knots becoming west 15 to
20 knots. showers likely. waves 1 to 3 feet building to 2 to
4 feet.
.sunday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 foot or less.
.monday...northwest winds 5 to 15 knots. waves 1 to 3 feet.
.tuesday...northwest winds 5 to 15 knots becoming south. waves
2 feet or less.
$$
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