Wednesday, February 5, 2020

Weather Discussion for Wednesday Feb. 5, 2020

Normal high/ low temperatures for Feb 3-Feb 10 (high/low) Redding 60/37, Chico 59/38, Quincy 50/26, Chester 48/23, Susanville 45/22, Grass Valley 55/34, Weaverville 53/29, Mt. Shasta 48/27, Yreka 49/26, Alturas 46/19
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

The mostly dry weather pattern will continue for at least the next week.  The high pressure ridge remains off the coast with the jetstream (storm track)  arching over the top of it and then dropping southward into western Canada. 

Today through midday Saturday Northern California will mostly sunny with some high cloudiness from the storms moving by to our north and east.  Temperatures will be 5 to 10 degrees above normal through Friday and then cool a little on Saturday.  Winds will be light until Saturday afternoon when southwest to northwest winds will increase. 

Late Saturday and Sunday a low pressure area will drop  southward along the California/Nevada border and end up over Southern California (see map below).  We will see a few clouds from this system with isolated light showers over the higher elevations.  Temperatures will drop back to below normal Sunday.  Gusty north to northeast winds expected Sunday.

Monday will be sunny with below normal temperatures.  Gusty north to northeast winds will continue.  Tuesday afternoon and Wednesday another low pressure area will drop southward across the north state.  This system will also bring a few showers to the  higher elevations.  Temperatures will cool and gusty north winds are expected.

The Old Forecaster

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  1. Hello, thanks for answering my previous posts. I guess you can call me a weather geek as I have always been interested in meteorology.
    Which leads me to a question I have always wanted to ask: Taking our current weather conditions with these high pressure ridges blocking our storms, I have always wondered what makes these ridges park themselves like they do? The troughs come and go, but the ridges get stuck. Does it have anything to do with the coastal mountain range acting like barrier? With high barometric pressure and the air sinking, is it due to too much resistance for them to keep moving and therefore get stuck. I’m sure that water temperatures as well as where the jet stream is has a lot to do with it. But just wanted to better understand the reason we get these long drawn out dry weather patterns.
    Thank you again for your helpful information.

  2. In the atmosphere there are semi permanent large scale pressure features....such as the Pacific high, Aleutian low, Hudson bay low, Bermuda high. The jetstream or storm track snakes around the northern hemisphere over the highs and around the bottom of the lows. Low pressure troughs and frontal systems ride along and to the north of the jetstream. These large scale features change in strength during the season and shift east and west. Example the high pressure ridge off the coast is now near the coast and strong. The jetstream goes over the top and drops into the western U.S. This brings relatively cold and dry systems into the western U.S. If the high moves back a little to the west the jetstream would drop from Alaska off the coast and across Northern California. This would be a cool but wetter pattern. If the high weakens the jetstream runs across the Pacific...over the high and into the west coast...a wet but not as cold pattern. Hope this explains some of you question.

    1. Thank you for explaining this. I have heard about the Pacific high, Aleutian low, etc. So basically they are always there, but strengthen and weaken depending on the season.