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James Bay - southern half

Marine Forecast

Issued 05:00 PM CST 19 December 2025

Tonight and Saturday.

Gale warning in effect.

Wind northwest 35 knots diminishing to northwest 25 near midnight and to west 15 late overnight. Wind diminishing to light early Saturday morning then becoming southeast 15 near noon Saturday.

Scattered flurries changing to snow Saturday evening.

Freezing spray warning in effect.

Over open water severe freezing spray becoming moderate overnight and ending Saturday morning. Moderate freezing spray beginning Saturday evening.

Low tonight minus 16. High Saturday minus 10.

Waves

Issued 05:00 PM CST 19 December 2025
Tonight and Saturday. Over open water seas 4 metres subsiding to 2 late overnight and to 1 or less early Saturday morning.

Ice Forecasts

Issued 11:00 AM EST 19 December 2025 Today Tonight and Saturday

Ice Edge

Ice edge is outside the forecast region.

Ice Coverage

Ice pressure warning in effect.

8 tenths grey-white ice. Consolidated grey-white ice along parts of
the coasts.
Strong ice pressure in the pack ice developing this afternoon and
easing overnight.

Warnings (In effect)

Gale warning in effect

James Bay - southern half

Issued 5:00 PM CST 19 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Freezing spray warning in effect

James Bay - southern half

Issued 5:00 PM CST 19 December 2025

Moderate or severe freezing spray is occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Ice pressure warning in effect

James Bay

Issued 11:00 AM EST 19 December 2025

Navigators in this marine area should be on the lookout for hazardous ice conditions and take necessary safety precautions. Please refer to the latest ice forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio stations.


Technical Marine Synopsis

Issued 4:45 PM EST 19 December 2025 Tonight and Saturday At 0000 UTC Saturday dissipating low 987 mb located at 65N 68W.

At 0000 UTC Sunday approaching low 948 mb located at 57N 57W.




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