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News / Clark County News

Weather Eye: Dry air, low humidity bring rapid drop in overnight temperatures

By Patrick Timm
Published: September 13, 2014, 5:00pm

Quite a swing in temperatures from day and night around the region the past couple of days. The very dry air mass with low humidity and dew points supported a rapid drop in overnight temperatures, especially outside of the windy and the main urban areas. Lows were in the 40- to 45-degree range, enough to see your breath by sunrise. Brrr.

With afternoon highs at 90 degrees, that made for a 45- to 50-temperature-degree spread. Impressive, I think.

At least that strong east wind has subsided, allowing the thermal trough of low pressure or heat low to develop along the coastal and western interior valleys. Hot weather was the rule even for the ocean beaches. Whenever it gets into the 80s at the beach, that is hot. Try and walk barefoot on the sand!

One more hot day at the beach today, and then a cooling trend there as the heat low moves inland and eventually east of the mountains. East side, it was mainly in the 70s for high temperatures, with a couple of 80-degree highs Saturday. The warmest high temperature I could find Saturday in the Evergreen State was right here in Vancouver. We’ll take the honors, don’t you think?

I mentioned here a few days ago about some forecast models showing an increase in moisture about midweek. They are still playing that tune, but realistically, at this point, I don’t see any wetting rains coming in. Maybe some drizzle and showers along the coast and spotty inland moisture. So, I will just say a chance of moisture Tuesday night through Friday. Back to sunny weather next weekend.

With the dry air and clear skies, did you see the Northern Lights the last night or two? I was too much of a sleepy head to stay up, but experts say the conditions were good for a sighting. Of course, being away from the bright city lights was a must.

Enjoy your week!

Patrick Timm is a local weather specialist. His column appears Tuesdays, Thursdays and Sundays. Reach him at http://patricktimm.com.

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