Anyone who has walked outside today can feel the cold front that came thru last night. Normally these inside slider storms are dry & what does cause snow is the cold unstable air being lifted by the mountains. As the cold front came thru last night a thin band of precip formed right around Truckee and then grew as it moved Southward. Snow levels were still high & the ground warm as it started in North Lake so you most likely awoke to frozen rain drops outside. In South Lake it was cold enough to put a coating of snow on top of the mountains. It will remain cold & unstable today so a snowshower is not out of the question. It will stay cold thru Thursday.
Ok, enough about dustings, when is the next or should I say First big dump coming. The Northern jet stream is definitely strengthening and storms will begin taking aim at the West coast this weekend. The ridge off the coast of CA was thought earlier this week to retrograde back westward in the Pacific allowing storms to dive down the coast into CA starting this weekend. It now appears that the ridge will stay where it is and will be able to keep the moisture from the storms just to the North or barely touching Tahoe. We may be in for one more week of nice weather starting Friday. Wouldn’t matter anyway because in that position any precip here would be rain.
I believe that the retrogression or “destruction” of the ridge off the CA coast is inevitable & is only being slightly delayed. Maybe because of some prayers or wishes by some that were caught off guard by the report of a possible big snowstorm this weekend & you have been procrastinating getting ready for winter. I think a few of you were in front of me in line for tires yesterday. For you this is your gift of an extra week to get ready.
I believe that there will be a retrogression of the ridge, possibly by the weekend of the 6th, opening the storm door. This is not only supported by unreliable fantasy charts on the models, but by the more reliable teleconnection forecasts that show the PNA & AO teleconnections heading negative for the month of Nov. This would help support a cold wet pattern for the West Coast. Only thing missing is some help from the MJO that is off on the other side of the globe, but forecasted to head East towards the Pacific the next couple of weeks. The negative SOI should be helping to get convective activity going in the tropical Pacific to help feed the jet stream as well.
The NWS 3 month outlook that shows us above average precip is based more on the months of Dec. & Jan., but I think we can get going a little early. BA
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