Dec 5, 2009 1:40 PM by Dave Hovde
Our weather is changing quickly. Yesterday coastal highs were near 70 (or slightly above) and today high temps will struggle to near 60.
A trough in the upper atmosphere is carving out a path from the east to the west, this will allow low pressure to spin up over the course of the weekend. At first partly cloudy skies will develop Saturday with onshore winds, moderately strong winds westerly at 15-25mph. Clouds will increase on Sunday. Much of the daytime Sunday should be rain free but Sunday night into Monday rain will develop. Up to a half inch is possible with this first system.
The first system is also a cold one, snow may develop on the I-5 Grapevine and potentially places like the Cuyama Valley...the further east and up you go the better the potential for snow.
Tuesday should be a short break before a warmer but stronger system movies in for Wednesday and Thursday. Several inches of rain is possible with this system. Models have reached some consensus on this and have been somewhat consistent with the timing for the last few days. We'll adjust the forecast as the event nears but our confidence in it is relatively high.
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