From the ABC 7 Weather team

Alberta Clippers to have collision course with D.C. this week

January 13, 2014 - 08:27 AM
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Alberta Clippers heading to D.C. bring chances of snow and colder temperatures.

Polar Vortex is so last week.

This week we’ll be talking all about the Alberta Clipper, or the “Clipper” for short. Chances are pretty good you’ve heard of this one before.

This week we will have at least two clippers move across our area, bringing chances of precipitation and shots of chilly air to follow them.

Computer Model Forecast of Clippers

So, what is an Alberta Clipper and how will it impact our weather?

Alberta Clipper

An Alberta Clipper is a fast moving winter storm that develops from the Canadian province of Alberta. This area of low pressure tracks along with the jet stream from Albert to the Upper Midwest, through the Great lakes and usually moves off the coast in the Mid-Atlantic.
Since these systems move pretty quickly - they're named clipper after sailing ships - the snowfall they bring with them tends to only amount to a few inches at most. But, they can usher in frigid temperatures on the back side along with gusty winds.
The first clipper arrives Wednesday afternoon and will bring some rain and snow to the D.C. area. Our ABC7 Futurecast model shows the chance of both late in the day.

Wednesday Rain/Snow on Futurecast

Right now, we expect little to no accumulation, but temperatures will drop about 10 degrees. The second clipper arrives late Friday and this one packs more of a punch. Temperatures will be much colder after it’s passage on Saturday.
Here's the European model solution for Saturday afternoon temperatures.

WeatherBell ECMWF Model

However, we don’t expect to squeeze out much moisture on Friday, just a few flurries. It's still early in the week, so the timing and precipitation expectations could change between now and then.  The ABC7 Stormwatch Team will keep you up to date.
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