Three to Four Major Storm Systems Expected To Slam California This Month; December 2014

On November 7th we released a forecast for end month to early December of a storm system to come in … it did.  Now we are releasing yet another long range forecast and our long range numbers suggests the jet stream is going to become very active and slam California with three to four strong to major storm systems during this month, two hitting in the next 7 to 14 days and all of them having snow at the mountain resorts finally so get those boards and skis ready!  Read on.

We declared El Nino official in the beginning of November and it hasn’t been disappointing thus far.  Meteorological Winter started on December 1st and this first storm of the meteorological winter season hit on time, starting the likelihood that we are on track for an above average rainfall season across  California.  December is going to be well above the average and we do believe that three or four strong to major storm systems are on track to slam the region, most of them snow producers in our local mountains.

The first two will hit before the middle part of the month.  These have dynamics trough features that will bring heavy rain, mountain snow, thunderstorms, and gusty winds into the region.  One of these we will start monitoring on Monday as of right now it is in the Northern Pacific and will originate from the Gulf of Alaska.

Toward the end of December is when the jet stream really starts getting interesting.  The stubborn Pacific Ridge finally gets replaced in long term with a wide trough and a very fast jet from Japan to Southern California will provide a number of storm systems into the region.  Because this wide trough exists, snow levels will remain low with each storm passing through.  This is an interesting thing popping up on our calculations.

All and all December is expected to provide California with above average precipitation and we will be plenty busy here at the forecast office.

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