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2026 Mid-Atlantic Severe Storm General Discussion


Kmlwx
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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
213 PM EDT Thu Jul 9 2026

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Southwestern Carroll County in north central Maryland...
  Northwestern Howard County in central Maryland...
  Central Montgomery County in central Maryland...
  Southeastern Frederick County in north central Maryland...
  Central Loudoun County in northern Virginia...
  Northern Fairfax County in northern Virginia...

* Until 245 PM EDT.

* At 213 PM EDT, severe thunderstorms were located along a line
  extending from near Linganore-Bartonsville to near Point Of Rocks
  to 6 miles north of Poolesville to near Leesburg to Purcellville,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  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.

* Locations impacted include...
  Germantown, Rockville, Gaithersburg, Leesburg, Olney, Damascus,
  Lansdowne, Lowes Island, Poolesville, Ashburn, Montgomery Village,
  North Potomac, Redland, Countryside, Purcellville, Round Hill,
  Boyds, Green Valley, Clarksburg, and Darnestown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail, damaging wind, and continuous cloud to ground lightning
are occurring with these storms. Move indoors immediately. Lightning
is one of nature`s leading killers. Remember, if you can hear
thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
 
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https://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=AFD&format=CI&version=1&glossary=1&highlight=off

 

While probability
outlooks could still change significantly being 7 days out, early ML
& AI outlooks have currently identified a 15%-30% probability for
severe weather occurrence associated with this system. As
details on this system become more defined, will have to
continue to monitor synoptic fluctuations in model guidance to help
identify any hazards associated with this system in the coming
days.
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https://www.spc.noaa.gov/products/exper/day4-8/

... Friday/Day 7 and Beyond -- Upper Great Lakes into the
   Mid-Atlantic ...

   Strong northwest flow will be established between the previously
   described western US ridge and eastern Canadian trough. Rich
   boundary layer moisture is expected to be present to the south of a
   residual cold front that will be draped somewhere from the Great
   Lakes southeast into the Mid-Atlantic/Southern New England. Strong
   diurnal heating each afternoon will support scattered thunderstorm
   development capable of producing damaging outflows. Severe
   probabilities were introduced for Day 7 with this outlook given
   increasing confidence in thunderstorms developing within surface
   troughing east of the Appalachians. The exact location of these
   highlights will likely be refined with subsequent outlooks.

   Additionally, the overall large-scale pattern seems conducive for
   one or more shortwave troughs to move through the broader
   northwesterly flow across this region. Given the (seasonably)
   strongly unstable and sheared environment, one or more southeastward
   moving MCSs may be possible during the Day 7 - Day 10 period.
   Ensemble guidance varies significantly as to the timing and location
   of these potential short-wave troughs, but the overall pattern would
   suggest additional severe weather potential at the end of the
   forecast period and in the days that follow.

   ..Marsh.. 07/11/2026
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6 hours ago, high risk said:

The rare Day 7 SPC outlook for our area!

Yes, esp. this time of year when large-scale dynamic forcing and strong low pressure areas are less, yet enough of a signal in the probs for SPC to outlook an area.

NW flow aloft can lead to some of the best tornado events due to excellent directional shear.  We have good speed shear very often, but strong directional shear is much less common. NW flow promotes lee troughing which can back the low-level winds, so you can over 90 deg turning sfc to 500 mb.

And you tend to get solid EMLs for more CAPE overall.

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6 minutes ago, frd said:

Interesting boundary from the storms in South Jersey is moving SW through Northern DE into NE MD,  causing storms to fire. I just missed one to my South.  

Yeah I mentioned that outflow boundary in the other thread.

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