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September 2019
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Colder Than Normal

Posted: September 30th, 2019
@NWSSeattle

 

Morning low temperatures dropped below 40ºF throughout the region this morning. It hasn’t been that cold around here since April 28. SeaTac didn’t break its record, though, which remains 36ºF in 1950.

 

Probable urban heat island effects aside, SeaTac hasn’t measured a low in the 30s this early since September 29, 1983 (NOAA NOWData).

 

It was also the fourth-straight morning with colder-than-normal low temperatures. We haven’t had four of those in a row since the first two weeks of March (and after all that February snow).

 

Seasonal outlooks called for a warmer-than-normal October (NOAA CPC). The latest long-range ensemble forecasts, however, suggest a bit of wild ride ahead: a long shot at 70ºF about a week from now, followed by another run at near-freezing temperatures a week after that (NAEFS).

 

For those of us watching The Blob, it’s still there. We’ll see if this flow pattern disrupts NE Pacific sea surface temperatures, but for the record, we did have two significant cold snaps in November 2014.

 

JRH