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James Bay - southern half

Marine Forecast

Issued 05:00 AM CST 19 December 2025

Today Tonight and Saturday.

Gale warning in effect.

Wind northeast 40 knots backing to north 45 this morning then to northwest 35 this afternoon. Wind diminishing to northwest 25 near midnight and to northwest 15 late overnight. Wind diminishing to light Saturday morning then increasing to east 20 Saturday afternoon.

Snow changing to flurries near noon. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Over open water severe freezing spray ending overnight.

High today minus 6. Low tonight minus 16. High Saturday minus 10.

Waves

Issued 05:00 PM CST 18 December 2025
Tonight and Friday. Over open water seas 2 metres building to 4 near midnight and to 6 early Friday morning. Seas subsiding to 4 Friday evening.

Ice Forecasts

Issued 11:00 AM EST 18 December 2025 Today Tonight and Friday

Ice Edge

Ice edge is outside the forecast region.

Ice Coverage

Ice pressure warning in effect.

9 tenths grey-white ice. Consolidated grey-white ice along parts of
the coasts.
Strong ice pressure in the pack ice in the southwestern section
developing Friday afternoon.

Warnings (In effect)

Gale warning in effect

James Bay - southern half

Issued 05:00 AM 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 05:00 AM 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 18 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 AM EST 19 December 2025 Today Tonight and Saturday At 1200 UTC Friday dissipating low 978 mb located at 64N 68W.

By 0000 UTC Sunday low 950 mb located at 57N 58W.




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