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Western Washington forecast

Temperatures surge with warm humid air and rain keeping Sunday very wet and mild. Drier weather develops mid-week after a stormy Tuesday.
Credit: KING

PUGET SOUND:

Rain becomes heavy at times, amounts .25" to 1". Rain will be off and on through the afternoon, gradually decreasing to showers by evening. Highs in the upper 60s to lower 70s, wind southeast to southerly 5-10 mph. 

DISCUSSION:

An atmospheric river coupled with a frontal system will keep rain going at times today.

The amount of moisture packed into the incoming air mass is near record territory for this time of year and will lead to higher humidity and near-record rainfall for some parts of western Washington.  

The highest amount of rain is expected to fall on the south facing slopes of the Olympic mountains, coast, southwest Washington and the southern Cascades. Approximately one to two inches of rain are anticipated in these areas.

During the day on Sunday, we will feel humid air flowing up from the south for a muggy feeling outside as temperatures warm into the low 70s. There will be a chance of a thunderstorm late on Sunday.  

The humid feeling will last into Monday.  Monday will have off and on showers but they will gradually decrease during the day. 

Another wave of rain Tuesday will be locally heavy, changing to showers, heavy at times and a risk of thunderstorms which will bring higher rainfall, lightning, and small hail in the afternoon. Temperatures should cool into mid to upper 60s. Drier and sunnier weather should develop for Wednesday and Thursday.