A tranquil spring afternoon transformed into a wild winter scene.
Hail and graupel coat Interstate 66 in Arlington on March 22. By Jeff Halverson and Jeff Halverson Bio Jason Samenow Jason Samenow Editor and writer covering weather and climate Email Bio Follow March 25 at 12:28 PM It was Mother Nature’s version of March madness. On Friday afternoon, a fast-moving squall line unleashed high winds, thunder and lightning, rain, hail, graupel and even snow in spots across the Washington region.
Forecasters knew that a line of gusty showers with a bit of hail or graupel was possible as a vigorous disturbance dropped through the region. But the intensity of this squall line exceeded expectations. Wind gusts over 50 mph were clocked in Dulles, Leesburg and Winchester. Reagan National Airport posted a 59 mph gust.
— Elizabeth Trentacost March 22, 2019 So what exactly is graupel? Weathercasters everywhere were using this term on the airwaves and TV to describe the ice falling out of this storm. Shown below is a radar capture of the squall line as it began consolidating, intensifying and bearing down on the Washington region. By mid-March standards, this was quite ominous-looking.
The graphic below shows an analysis of this shortwave. This is a very “busy” analysis diagram , but you can tell that something very “busy” appears over the region of Ohio-West Virginia. The pink-shaded tones show the energy center, over Ohio, around noon. This energy packet was moving rapidly toward the east-southeast and would begin affecting the D.C. region from 3 to 4 p.m.
Meteorologists recognize that fairly intense storms can erupt even when one of the classic ingredients is lacking; in other words, weak and shallow instability will do the trick, only if there is an especially large amount of coincident uplift created by an approaching, dynamic system such as a shortwave.
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