Cold and snowy week as Siberian air flows into North America by the weekend

Sunday, February 2, 2014

After a beautiful day today, a couple of complex storm systems will affect our area this workweek and this weekend. Another very cold wave rotating around the Hudson Bay vortex will force the low currently just off the northern California coast to drop southeastward along the coast today and then westward along the Old Mexico border Monday. We may see some snow showers during the day tomorrow as the upper level flow backs to the southwest, moving moisture and warmer temperatures into our area.

I don’t expect much accumulations from this until the very cold wave mentioned above approaches our area early Tuesday. Temperatures should fall through the day and snow increase as the very light winds turn to our favored northwest direction. Even though wind speeds will be low, I expect signficant accumulations by Wednesday morning as the snow will be of very low density - maybe as much as 6-12”.

Current forecasts have this Hudson bay wave mixing with some newly arrived Siberian air and briefly cutting off from the main flow over the Washington / Oregon area by Thursday. The end result is the bitterly cold temperatures on Wednesday will moderate a bit as the flow once again backs to the west and warms. But snows are unlikely to take more than a brief break as bits of energy ejecting from this spinning low to our northest will keep showers going.

Models then have Pacific energy phasing with this spinning storm creating a powerful storm that is currently forecast to move over our area late in the workweek or early in the weekend. Very substantial accumulations are expected before current iterations of the models then indicate a hemispheric pattern change to warmer and more zonal (east-west oriented) flow.

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