Cool, Possibly Showery Pattern Returns This Weekend

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We’ve been on quite the roller coaster ride pattern wise across California the last couple weeks. The last couple days, temperatures in the valley have not made it into the 80s, with freezing temperatures recorded in some mountain locations.

We’ll climb a little bit temperature wise through Saturday, with 80s in the valley returning, however a stronger, deeper trough/upper low will dive out of the Gulf of Alaska on Sunday. This trough/ULL will be supported by a fairly strong upper level jet, 100 – 130kts at 300mb.

00z GFS plot for Wednesday afternoon with the fill being 300mb winds, and the lines being 500mb heights. Reds = 100kts+

00z GFS plot for Wednesday afternoon with the fill being 300mb winds, and the lines being 500mb heights. Reds = 100kts+

The jet streak picks up a stronger shortwave come Monday, with a warm air advection precipitation band working across northern California, with some showers… mainly from Sacramento northward. The northwest flow may continue into Tuesday, keeping things cloudier along with the threat of showers going. Temperatures will range from the mid 70s to the low 80s Sunday – Tuesday, with upper 70s to mid 80s by Wednesday, then across the board 80s by later next week.

Graphic depicting the troughy/cool pattern.

Graphic depicting the troughy/cool pattern.

At the moment, no significant precipitation amounts are expected early next week. Locally a few hundredths to a tenth or two is possible, possibly a quarter to half an inch locally in extreme northeast Butte/northern Plumas/southwest Lassen counties.

I’ll post another update this weekend if models trend wetter, or a convective threat makes itself known.

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