PORTLAND -- After days of quiet October weather, we will see cold temperatures this coming week with possible showers for Halloween. The trace of rain Friday brought by morning fog means PDX will not set any record for dry weather this month.
The streak of days with no moisture ended at 12.
A push of much colder Canadian air, arriving from the north Sunday will kick-off a series of weather changes in the coming days.
The color map above shows air mass temperatures at 5,000 feet in Celsius. The -3 reading expected Monday east of The Dalles means surface temperatures in the 40s.
The -10 reading over Canada means highs near 30 degrees or colder.
For Portland, we may see a trace of Sunday rain, but the bigger story will be the cooler air that will produce east winds Sunday night and Monday.
Remember that east winds in our region, typically advance dry air and low dew points. The result will be freezing temperatures Tuesday morning in calm wind spots.
Winds will calm and kick back to the west mid-week, which will bring clouds for Halloween and a chance of light showers.
Rain looks likely to return next weekend. In fact, as November begins, above-normal rainfall is projected for the first 10 days of the month.
Standard time returns Sunday at 2 a.m. Nov. 3. You will need to push your clocks back one hour. A sunset this week around 6:00 pm will set around the 5:00 hour Sunday afternoon.
--Meteorologist Rod Hill