Breaking: Squall Line of Showers Rapidly Approaching DC Area with Damaging Winds in Excess of 60mph

 Breaking: Incoming Squall Line

A line of showers and thunderstorms (image below courtesy pivotal weather) is currently racing southeast out of the Alleghenies mountains.

This squall line is the secondary cold front getting ready to race across the DC area between 4 and 6PM (height of rush hour) with the potential for widespread wind gusts in excess of 60 mph!

If you haven’t left for home yet, you might want to consider as these showers could cause tree branches to fall as well as power lines … snarling the afternoon rush hour especially in wooded residential areas.

High Resolution HRRR model shows damaging winds with line of showers….

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Travel Nearly Impossible Thursday as High-Impact Winter Storm Blasts DC Area

Latest Snow and Sleet Accumulation Potential Map

This will be a high-impact winter storm with a crippling sleet and/or freezing rain event along and east of Interstate 95.  For those of you in the 6 to 10″ area of my map below — this is mainly a snow event .  Elsewhere, precipitation will begin as a period of accumulating snow before changing to sleet  and/or freezing rain.

The million dollar question remains whether we see mostly sleet (ice pellets) or freezing rain (liquid that falls and freezes on everything).

Ice Accumulations from Freezing Rain could be Crippling along Interstate 95

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Latest Guidance Significantly Increasing Ice Amounts in DC Metro

The latest trend in this evening’s forecast model guidance from both the American and European models have increased the amount of ice accumulation across the DC Metro Area Saturday afternoon through the overnight.  If these trends hold, the Winter Weather Advisories currently in place across parts of the DC Metropolitan Area may be upgraded to Ice Storm Warnings!

Ice Storm Warnings are issued when ice accretion (accumulation) from freezing rain is at least a quarter-inch which is capable of causing tree damage and scattered to widespread power outages.

Winter Weather Advisories are issued when ice accretion from freezing rain is expected to remain under a quarter-inch.

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