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April Discobs 2021


George BM
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We've had better winds without even an advisory (Christmas Eve) here.

Sure they're been some gusts here and there and the 43mph peak (not even 3 second standard) is pretty weak.  Not that I'm complaining! LOL

But it looks like the warning is staying for us because some stronger winds are inbound.

Too bad it's not 18 degrees and snowing with thunder.  I don't care what kind of weather nut you are, that's just about as good as it gets.  And nobody loses their house in the process. ;)

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Just now, midatlanticweather said:

That line of showers brought some of the best severe winds of the Spring! WOW!

 

It's always the sneaky events! 

Tree down at the bottom of the street doing all kinds of creaking. If it falls it's taking the pole at the dead end out with it. 

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(snip)
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
439 PM EDT Fri Apr 30 2021

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  The District of Columbia...
  South central Howard County in central Maryland...
  Southern Montgomery County in central Maryland...
  Prince Georges County in central Maryland...
  West central Anne Arundel County in central Maryland...
  Northwestern Charles County in southern Maryland...
  Southeastern Loudoun County in northern Virginia...
  The City of Falls Church in northern Virginia...
  Fairfax County in northern Virginia...
  East central Fauquier County in northern Virginia...
  The City of Manassas Park in northern Virginia...
  Prince William County in northern Virginia...
  The City of Manassas in northern Virginia...
  The City of Fairfax in northern Virginia...
  Arlington County in northern Virginia...
  The City of Alexandria in northern Virginia...

* Until 515 PM EDT.

* At 438 PM EDT, severe thunderstorms were located along a line
  extending from Montgomery Village to near Chantilly to Warrenton,
  moving east at 65 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

(snip)

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Hearing some thunder. This should be the leading edge of the stronger winds.

Latest from Mount Holly-

A strong perturbation, now evident on moisture- channel imagery over the Great Lakes region, was sampled at 500 mb in the Upper Midwest with an attendant 90+ kt jet streak surging southeastward. The 500-mb temperatures were quite cold for this time of year near the center of the low, with readings near or below -30C in northern Michigan into central Ontario. Intense 850-mb cold advection was occurring in the Great Lakes region and is racing southeastward into the Appalachians this afternoon.

A band of showers in advance of the aforementioned perturbation had developed in the central Appalachians and will likely move through portions of the area late this afternoon and early this evening, especially for the southern half of the CWA. Nudged PoPs upward just a little bit more, based on upstream radar trends. With 40-50 kt winds at the top of the mixed layer, would expect strong to locally damaging wind gusts in proximity to these showers. Synoptic-scale winds will then surge for a time after the stronger cold advection sweeps across the area this evening, collocated with intense surface- pressure rises behind the reinforcing front late this afternoon. Models have trended slightly lower with gusts this afternoon/evening, but they also have verified on the low side so far today. As a result, continued to forecast winds higher than guidance, with the peak timing generally 21z to 03z with a diminishing trend thereafter as the surface pressure rises gradually lessen. All of this said, the high wind warning was unchanged with this update, with numerous impacts expected across the region.

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It's high-based shower activity sitting on the top of an inverted-V thermal profile. Much more typical of the West, but in this case, with high gradient winds and a low tropopause. Most of the precip evaporates before hitting the surface, but strong evaporational cooling into a dry-adiabatic sub-cloud layer is able to efficiently mix down winds from aloft.

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9 minutes ago, vastateofmind said:

Yep, just got the wx radio alert. Hardly anything on radar though??

So the lead line getting ready to hit DC is the gust front from the larger line behind it. Winds picked up so much in it they issued a severe warning for it. 

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