Monday, December 4, 2017

Weather Discussion for Monday December 4, 2017

Normal high and low temperatures for Dec 4-Dec 11  (high/low)...Redding 56/38, Chico 58/37, Quincy 47/26, Chester 43/22, Susanville 44/24, Grass Valley 54/32, Weaverville 48/29, Mt. Shasta 46/27, Yreka 46/26, Alturas 44/18

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.

A large high pressure ridge is developing along and over the west coast and will hold there for at least the next week (see map below) and probably 10 to 14 days.  The north state will have mostly clear skies and above normal daytime temperatures.  There will be periods of gusty north winds.

This weather pattern is a classic "Omega Block" and that is why it will be so persistent.  The longer range models still indicate a wetter pattern the last half of December.

The Old Forecaster

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  1. How do you see the longer range wetter pattern setting up? Undercutting of the high pressure from the south or the high pressure moving elsewhere?

  2. A little bit of both. Nothing will happen until the large trough over the eastern U.S. begins to weaken. It looks like this will happen the last 10 to 15 days of Dec. This will allow the west coast ridge to weaken and split with the jetstream running across Northern Calif and southern Oregon.