Monday, December 18, 2017

Weather Discussion for Monday December 18, 2017

Normal high and low temperatures for Dec 18-Dec 25  (high/low)...Redding 55/35, Chico 56/35, Quincy 44/24, Chester 42/20, Susanville 40/22, Grass Valley 54/31, Weaverville 46/29, Mt. Shasta 43/23, Yreka 43/24, Alturas 42/16

This blog will be issued every Monday, Wednesday, and Saturday morning and updated if the weather is changing or critical or interesting weather events are occurring.

High pressure still holding.  Today should be a repeat of yesterday.  Clouds will begin increasing Tuesday afternoon as a low pressure area slides southward along the Canadian coast and them moves across Northern California Tuesday and early Wednesday.   Unfortunately there is not a lot of moisture with this system.  The foothills and mountains will see light rain or snow Tuesday night through Wednesday afternoon.  The valley north of Biggs will see a few light showers.  Snow levels will be 3000 to 3500 feet.

High pressure is back along the coast by Thursday and will hold there at least through the weekend (see map below).  The north state will have mostly clear skies with mild temperatures and periods of gusty north winds. 

The extended models indicate that the jetstream will try and split toward the end of the month with the southern branch headed our way.  The problem is they all show the southern branch as very weak.

The Old Forecaster

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