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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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Maybe this dreadful heat this week will come with something of a payoff down the road. From the Sterling AFD:

Thursday and Friday should bring a gradual shift in the pattern. As
noted in global ensembles, the culprit is a longwave trough pushing
through the Great Lakes. A lot of details need to be resolved before
more accurately portraying any convective threats. However, coming
off a lengthy period of hot and humid weather often yields an
unsettled pattern given notable forcing mechanisms. For now, will
keep shower and thunderstorm chances to close out the work week.
While conditions remain on the hot side, temperatures do fall by
around 4 to 8 degrees compared to earlier in the week.

&&
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4 hours ago, Eskimo Joe said:

^big heat does not go quietly into the night. September can be interesting because we get strong cold fronts with some more pronounced upper level support. What we really need though is a solid 2" - 4" of rain over a day or so.

GL trough sounds like a continuance of the same pattern of the summer.  The usual areas will get storms, and the usual areas will miss.

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48 minutes ago, Stormchaserchuck1 said:

This low pressure looks amped for severe wx chances tomorrow 

 

     Yes, but it's progged to split and then shear out a lot tomorrow as it comes east.    Instability will be good, and there may be just enough shear for a few organized cells with some wind potential, but it sure doesn't look like a big day.    Hell, I'm thrilled just to have a threat of convection again.

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18 minutes ago, high risk said:

     Yes, but it's progged to split and then shear out a lot tomorrow as it comes east.    Instability will be good, and there may be just enough shear for a few organized cells with some wind potential, but it sure doesn't look like a big day.    Hell, I'm thrilled just to have a threat of convection again.

  And of course SPC issues a SLGT right after I type that.....

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12 hours ago, high risk said:

Seems to be some pretty good agreement among the CAMs that the best chance of storms early tomorrow evening is over north and north-central MD.

MBY is sitting on the southern edge of the SLGT, which always gives me some pause. Better than being on the SW edge though!

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I’m quite shocked how unstable it is outside already.  May have the highest cape values this early compared to any other time this summer that I can remember.  Even mid-level lapse rates aren’t too shabby.  Shear could be better of course but definitely decent parameters in place.  I haven’t really been following this event too closely outside of chance of storms/rain over several days.  

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3 minutes ago, AmericanWxFreak said:

HRRR has barely had anything except a couple cells scraping through the northern tier for several runs in a row now. The 3k NAM continues to be much more bullish for most of the area. 

It's also completely whiffed on the current line, whereas the 3k at least has something at 16z.

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9 minutes ago, AmericanWxFreak said:

HRRR has barely had anything except a couple cells scraping through the northern tier for several runs in a row now. The 3k NAM continues to be much more bullish for most of the area. 

I started looking at models and was ready to say we were out of luck again.. but radar was not in sync with it! Then I saw the SPC as well. Seems we have some triggers.. can it happen? I hope so! 

 

 

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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
108 PM EDT Thu Sep 7 2023

VAC069-WVC003-065-071730-
/O.CON.KLWX.SV.W.0303.000000T0000Z-230907T1730Z/
Frederick VA-Morgan WV-Berkeley WV-
108 PM EDT Thu Sep 7 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR NORTH CENTRAL FREDERICK COUNTY IN NORTHWESTERN VIRGINIA...CENTRAL
MORGAN AND NORTHERN BERKELEY COUNTIES IN THE PANHANDLE OF WEST
VIRGINIA...

At 108 PM EDT, a severe thunderstorm was located near Greenwood,
moving northeast at 25 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and power lines. Hail is large
         enough to dent and damage vehicles. Some hail damage to
         roofs, siding, and windows is possible.

Locations impacted include...
Martinsburg, Greenwood, Berkeley, Hedgesville, Johnsons Mill, Cherry
Run, Tomahawk, Glengary, Johnsontown, Omps, Shanghai, Spohrs
Crossroads, Oakland, Spruce Pine Hollow, Stotlers Crossroads,
Highland Ridge, Jones Springs, Valley High, Unger, and New Hope.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 3968 7810 3963 7803 3960 7801 3960 7799
      3952 7788 3935 7822 3946 7833
TIME...MOT...LOC 1708Z 227DEG 22KT 3950 7819

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$
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