Monday, November 20, 2017

Weather Discussion for Monday November 20, 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.

Not a normal late fall weather pattern for the next few days.  High pressure has formed over the southwestern U.S. and is ridging northward over California.  Normally with this pattern we would see sunny skies and above normal temperatures.   The large scale low pressure area in the Gulf of Alaska continues to generate frontal systems and send them across the Pacific Northwest.  Looking at the satellite picture (below) you can see that the low has tapped subtropical moisture and is pulling lots of clouds northeastward toward the west coast.  The map below shows little change in the pattern through early Saturday.

Today a frontal system is moving into the Pacific Northwest and the tail end of it is brushing northern California.  Due to the sub tropical moisture this system will bring moderate precipitation to the northwest corner of the state today with amounts getting lighter the further south and east you go.  Snow levels will be 6000 feet or higher.

Tuesday and Wednesday Northern California will see partly cloudy to cloudy skies with a few showers over the northwest corner of the state.  Thursday another weak frontal will brush the north state and bring a chance of showers to all areas.  Snow levels will continue high.

Friday and early Saturday we will have partly cloudy to cloudy skies with a few showers over the north coast and northern mountains.  Late Saturday the high will weaken and the jetstream will drop southward.  This allow a stronger storm system to move into the area Sunday and Monday with light to moderate rain and sow levels dropping to 4500 to 5000 feet by Monday. 

The Old Forecaster

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