Weather Geek’s Blog

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The backside of the “comma”

Posted by wxgeek on February 21, 2009

The models are now in much more agreement that the backside of the “comma” shape from the coastal low will produce much more in the way of snowfall than the warm air advection ahead of the storm.

As the storm strengthens during the late evening it will wrap and pull colder air in from the northwest and the snowfall will be heavy at times, even at the coast, as the storm rides northeastward.

Essentially we are looking at almost 2 events from one storm. The first will be the precipitation out ahead of the low as it is forming. The second will be the moisture being pulled in on the backside as the cyclonic flow wraps in the snow from the northwest.

It is possible that 6 inches of snow could fall for parts of the southern coast, and more likely the mid coast as the storm pulls away.

Remember, this will be “after” a significant several hours of rain. So things are going to change in a hurry with this storm.The storm will not technically be “over” until midday Monday for northern locations. Consequently, the mountains will see snow into monday as upslope snow showers persist. 2 feet of snow is likely in those localized areas.

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