James Bay - northern half Marine Forecast, Warnings and Alerts

Canada

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Current Conditions

Canada 7 Day High and Low Temperatures Forecast

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James Bay - northern half

Marine Forecast

Issued 05:00 PM CST 20 December 2025

Tonight and Sunday.

Wind light increasing to northeast 15 knots this evening and to northwest 25 late overnight. Wind backing to west 15 to 20 Sunday afternoon.

Scattered flurries. Fog patches forming Sunday morning.

Freezing spray warning in effect.

Over open water freezing spray beginning this evening.

Temperatures minus 16 falling to minus 21 Sunday evening.

Winds

Issued 05:00 PM CST 20 December 2025

Tonight and Sunday. Wind light increasing to northeast 15 knots this evening and to northwest 25 late overnight. Wind backing to west 15 to 20 Sunday afternoon.

Waves

Issued 05:00 AM CST 20 December 2025

Today Tonight and Sunday. Over open water seas 2 metres subsiding to 1 or less this morning then building to 2 Sunday morning.

Weather & Visibility

Issued 05:00 PM CST 20 December 2025

Tonight and Sunday. Scattered flurries. Fog patches forming Sunday morning.

Air temperature

Issued 05:00 PM CST 20 December 2025

Tonight and Sunday. Temperatures minus 16 falling to minus 21 Sunday evening.

Freezing Spray

Issued 05:00 PM CST 20 December 2025

Tonight and Sunday. Freezing spray warning in effect. Over open water freezing spray beginning this evening.

Ice Forecasts

Issued 11:00 AM EST 20 December 2025 Today Tonight and Sunday

Ice Edge

Ice edge is outside the forecast region.

Ice Coverage

7 tenths grey-white ice except 9 tenths grey-white ice in the
western section. Consolidated grey-white ice along parts of the
coasts.

Warnings (In effect)

Freezing spray warning in effect

James Bay - northern half

Issued 5:00 PM CST 20 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.

Technical Marine Synopsis

Issued 4:45 PM EST 20 December 2025 Tonight and Sunday At 0000 UTC Sunday quasi-stationary low 983 mb located at 68N 77W.

At 0000 UTC Sunday low 947 mb located at 59N 57W.
By 0000 UTC Monday low 969 mb located at 71N 62W.

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