Saturday, November 25, 2017

Weather Discussion for Saturday November 25, 2017

Normal high and low temperatures for Nov 20-Nov 27  (high/low)...Redding 59/38, Chico 61/38, Quincy 52/27, Chester 47/25, Susanville 48/26, Grass Valley 57/34, Weaverville 54/31, Mt. Shasta 48/28, Yreka 51/27, Alturas 49/21

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.

Looking the satellite picture below you can see that the high pressure ridge is still over the southwestern U.S. with a low pressure area in the Gulf of Alaska.  The most impressive feature is the continued strong flow of subtropical air northward and over the top of the ridge.  This moist airmass is now over Northern California and is causing a few light showers along the coast, over the coastal and northern mountains and in the valley north of Red Bluff.  Later today the high will begin to weaken and move eastward as the low pressure area in the Gulf moves southeastward.  Rain will spread over the area tonight with moderate to locally heavy precipitation over Northern California Sunday.   Snow levels will start out high but drop to 4500 to 5500 feet by Sunday evening.  Monday the low will be moving east.  There will be some morning showers over the Sierra Cascades but they will end by mid afternoon.  

Tuesday evening a weak low pressure trough will brush the north end of the state (see map below).  This system will bring a few clouds to the north state with a few light showers over Siskiyou, Modoc,and Lassen counties.  Wednesday through midday Friday look mostly sunny and mild with gusty north winds.   

Clouds increase Friday afternoon with showers Saturday as another low pressure trough moves through the area.

The Old Forecaster

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1 comment:

  1. any idea what is causing the Hp over the southwest?Is it something usual for this time of the yaer? thank u