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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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1 hour ago, Kmlwx said:

HRRR looks semi decent for at least storms today - severity to be determined. 

      Yeah, chances of more widespread storms today seem much higher.    But the overall environment is far less favorable for severe:   less CAPE, weaker lapse rates, and weaker shear.     The one "sneaky factor" we have is a fair amount of downdraft CAPE, so perhaps if the storms organize and form a cold pool, we could get some decent gusts.

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21 minutes ago, high risk said:

      Yeah, chances of more widespread storms today seem much higher.    But the overall environment is far less favorable for severe:   less CAPE, weaker lapse rates, and weaker shear.     The one "sneaky factor" we have is a fair amount of downdraft CAPE, so perhaps if the storms organize and form a cold pool, we could get some decent gusts.

DCAPE is seemingly always a factor that performs for us even in potentially marginal events. 

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5 minutes ago, Terpeast said:

LWX seems a little late with their morning update. Gun shy about this afternoon?

Just came out

Quote
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1027 AM EDT TUE JUN 27 2023

.SYNOPSIS...
AN UPPER TROUGH CENTERED TO OUR NORTH WILL SLOWLY PROGRESS
EASTWARD TOWARD NEW ENGLAND THROUGH THURSDAY. HIGH PRESSURE WILL
BUILD IN AT THE SURFACE FOR THURSDAY AND FRIDAY. AN AREA OF LOW
PRESSURE WILL TRACK INTO THE GREAT LAKES THIS WEEKEND.

&&

.NEAR TERM /THROUGH TONIGHT/...
A COLD FRONT WILL PROGRESS THROUGH THE AREA THIS AFTERNOON. 
SKIES ARE CURRENTLY PARTLY TO MOSTLY SUNNY ALONG AND EAST OF
I-81, WHILE THEY ARE MOSTLY CLOUDY TO CLOUDY TO THE WEST OF
I-81. SOME EARLY MORNING SHOWER ACTIVITY THAT WORKED ITS WAY
THROUGH AND NEAR BALTIMORE AND NORTHEAST MARYLAND ARE EXITING
INTO NORTHERN DELAWARE. ADDITIONAL LIGHT SHOWERS ARE MOVING
ACROSS PENDLETON AND SOUTHERN HARDY COUNTIES. WITH PLENTY OF
SUNSHINE EAST OF I-81 AND A MARGINAL SEVERE THUNDERSTORM RISK
FOR THIS AREA AND AN APPROACHING COLD FRONT, ADDITIONAL HEAVIER
SHOWERS AND A COUPLE OF STRONGER TO SEVERE THUNDERSTORMS WILL
DEVELOP. SHOWERS AND A FEW EMBEDDED THUNDERSTORMS SHOULD BEGIN
TO DEVELOP ALONG I-81 BETWEEN 11 AM AND 1 PM. THESE SHOWERS AND
THUNDERSTORMS WILL THEN STEADILY PROGRESS EASTWARD ACROSS THE 
AREA THIS AFTERNOON ALONG WITH THE SYSTEM'S COLD FRONT. THIS
ACTIVITY IS STILL EXPECTED TO CLEAR THE AREA BY AROUND 7 OR 8 
PM, WITH DRY CONDITIONS EXPECTED OVERNIGHT. THE BEST CHANCE FOR 
SHOWERS AND STORMS IN THE DC/BALTIMORE METROS WILL BE BETWEEN 
2 PM AND 6 PM.

PREVIOUS DISCUSSION...
THUNDERSTORMS LATE THIS MORNING AND INTO THIS AFTERNOON WILL
HAVE AROUND 1000 J/KG OF MLCAPE TO WORK WITH, ALONG WITH 
RELATIVELY WEAK WINDS THROUGH THE DEPTH OF THE TROPOSPHERE (25 
KNOTS OR LESS UP TO THE EQUILIBRIUM LEVEL). THERMODYNAMICALLY 
SPEAKING, MODEL SOUNDINGS SHOW A WELL- MIXED SUB-CLOUD LAYER, 
WITH RELATIVELY STEEP LOW- LEVEL LAPSE RATES, BUT THEN DEEP 
SATURATION ABOVE THE LCL. THIS DEEP SATURATION WILL LIMIT DCAPE 
AND RESULTANT EVAPORATIVELY DRIVEN DOWNBURST POTENTIAL. HOWEVER,
SOME GUSTY WINDS CAN'T BE RULED OUT IN ASSOCIATION WITH THE 
STRONGEST STORMS. FLOODING POTENTIAL ALSO LOOKS TO BE VERY LOW 
TO NEAR ZERO, AS STORMS WILL BE RATHER PROGRESSIVE, AND MOVE ON 
TOWARD THE EAST AT A DECENT CLIP.

&&

 

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yesterday.gif

Meh, mostly a bust for our area. Cells struggled as they came off high terrain over N Va and most of MD. Needed a bit more BL moisture to avoid it being partially mixed out in the PM hours. Where that was available, they did pretty well.

Ironically, we'll probably get better storm coverage today with higher quality BL moisture and direct forcing from the upper trough. Shear is light, so shorter-lived multicells only.

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14 minutes ago, csnavywx said:

yesterday.gif

Meh, mostly a bust for our area. Cells struggled as they came off high terrain over N Va and most of MD. Needed a bit more BL moisture to avoid it being partially mixed out in the PM hours. Where that was available, they did pretty well.

Ironically, we'll probably get better storm coverage today with higher quality BL moisture and direct forcing from the upper trough. Shear is light, so shorter-lived multicells only.

It is interesting that there were several "gaps".  It wasn't only DC, but the VA/NC border, the NC/SC border, and NE PA.  These are things that are just simply unpredictable at this point.

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5 minutes ago, MN Transplant said:

It is interesting that there were several "gaps".  It wasn't only DC, but the VA/NC border, the NC/SC border, and NE PA.  These are things that are just simply unpredictable at this point.

Feels like the days of linear storms along a boundary are gone.  The proliferation of taco bells is the problem

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Despite the terminal radars, not having the KLWX radar has been a major detriment. Nonetheless - looking at the KDOX radar seems to show a decent (albeit messy) cluster of storms forming. Seems many areas that missed out yesterday should at least pickup some thunder and rainfall if sub-severe.

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4 minutes ago, Kmlwx said:

Despite the terminal radars, not having the KLWX radar has been a major detriment. Nonetheless - looking at the KDOX radar seems to show a decent (albeit messy) cluster of storms forming. Seems many areas that missed out yesterday should at least pickup some thunder and rainfall if sub-severe.

That cell that just went through Gainesville looks healthy...seems to be aiming directly at central/north FfxCo.

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36 minutes ago, Kmlwx said:

Despite the terminal radars, not having the KLWX radar has been a major detriment. Nonetheless - looking at the KDOX radar seems to show a decent (albeit messy) cluster of storms forming. Seems many areas that missed out yesterday should at least pickup some thunder and rainfall if sub-severe.

We are so very fortunate to have a dense network of environmental observations systems in this part of the country. Radar, satellite, stream gages, volunteer weather spotters/observers, trained meteorologists, a Delmarva mesonet, and soon a mesonet in Maryland. This multi-layered approach mitigates risk when one system is unavailable.

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Just now, Eskimo Joe said:

We are so very fortunate to have a dense network of environmental observations systems in this part of the country. Radar, satellite, stream gages, volunteer weather spotters/observers, trained meteorologists, a Delmarva mesonet, and soon a mesonet in Maryland. This multi-layered approach mitigates risk when one system is unavailable.

100% agreed. Despite the other radars being obviously worse than LWX for many areas - it is great having so many failovers. 

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