Dec 4, 2009 11:53 AM by Dave Hovde
A complicated forecast ahead to be sure. First thing first, the short term. The battle this morning will be between a weak offshore wind vs. some coastal clouds. The offshore should win, but it'll be another cool start for certain in the valleys with freezing conditions likely.
As for most of Friday, enjoy it. It'll be the warmest day for awhile. Temperatures will jump back up to roughly the mid 60s for most. Winds should be generally light. Changes start as early as Saturday with onshore flow returning dominantly. Cool air returns for the weekend with highs only in the lower 60s. By Sunday night and Monday an area of low pressure spins up in the Central Sierra and draws in available Pacific moisture for a good chance of rain on Monday.
Then the pattern continues to evolve. A more west to east flow in the upper atmosphere allows a series of impulses to work directly over the area Wednesday and Thursday for more rain.
So how much rain are we talking about here:
Wednesday - Thursday: .40-1.5"
The following weekend could also feature rain in a pattern which looks much more El Nino-like.
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