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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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Per the LWX AFD, looks like the MCS in Tennessee has killed off any chance of an EML:

Quote
.NEAR TERM /THROUGH TONIGHT/...

945 AM UPDATE: VISIBLE SATELLITE SHOWS CLEARING EAST OF THE BLUE
RIDGE WITH A LINE OF CUMULUS CLOUDS FURTHER WEST MOVING EAST 
BUT BEGINNING TO SHOW SIGNS OF DISSIPATION. LATEST HRRR RUNS 
SUGGEST TD'S DROPPING INTO THE 50S OVER THE NEXT SEVERAL HOURS 
BUT THE INCLINATION IS THAT THEY MAY MORESO BE IN THE 60S AND 
70S BY THE EARLY AFTERNOON WHICH MAY SUPPORT CONVECTIVE 
INITIATION. GUIDANCE CONTINUES TO AGREE ON A SURFACE TROUGH 
CONVECTIVE INITIATION ELEMENT ALONG THE I-81 CORRIDOR BY EARLY 
THIS AFTERNOON AND MOVE FURTHER EAST THROUGHOUT THE DAY. A 
DECAYING MCV ACROSS THE TENNESSEE VALLEY THIS MORNING MAY LIMIT 
LAPSE RATES FURTHER NORTH INTO THE LWX AREA (SLIGHTLY WEAKENED 
HAIL SIGNAL) WHILE MAINTAINING STRONGER VALUES FURTHER SOUTH 
INTO AKQ/RAH'S TERRITORIES. A SCHEDULED 18Z SPECI RAOB LAUNCH 
WILL LIKELY ASSIST IN EVALUATING SEVERE POTENTIAL ACROSS THE 
METROPOLITAN AREAS LATER THIS EVENING. OTHERWISE, PREVIOUS 
DISCUSSION CONTINUES TO RUN PARALLEL WITH THE CURRENT FORECAST.

Latest SPC meso analysis seems to confirm this. 

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2 hours ago, mappy said:

So on the flip side, if they didn't make those comments and it did end up being a really bad severe day, media would never hear the end of the complaints.

Forecasters really can't win...like literally there will be complaints either way, lol Been like that for years, haha For some reason some can't seem to grasp the inherent unpredictability of weather!

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Cirrus clouds are back. I understand why some are having doubts on today. 

Really tough situation for forecasters. If they portray this as just another summer day with a chance of tstorms and they overperform, they're going to get hell for underplaying it. OTOH they talk up the severe and it underperforms, they'll be seen as the boy who cried wolf... and lives might get lost the next time a severe event actually verifies.

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7 minutes ago, Terpeast said:

Cirrus clouds are back. I understand why some are having doubts on today. 

Really tough situation for forecasters. If they portray this as just another summer day with a chance of tstorms and they overperform, they're going to get hell for underplaying it. OTOH they talk up the severe and it underperforms, they'll be seen as the boy who cried wolf... and lives might get lost the next time a severe event actually verifies.

Really a no-win situation 

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1 hour ago, Kmlwx said:

HRRR is still pretty meh

   The way that the HRRR mixes out the low-level moisture this afternoon makes it impossible for that model to generate any substantial convection.    What alarms me now is that most of the other CAMs made a big jump this morning to mix a lot more strongly.   They're overall not to HRRR levels, but it's significant, and their simulated reflectivities look really discouraging.

    The 12Z IAD raob has a LOT of dry air just above the boundary layer, way more than progged in recent days.  So the idea of mixing leading to low-level drying may very well be legitimate.    Let's watch the evolution of surface dew points over the next few hours and wait for the 18Z raob. 

 

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@high risk - definitely a wait and see kind of thing but I have noticed a really big change in the sim reflectivity maps for much of the modeling for the greater DC area. It almost looks like the better chance of storms is tomorrow on the NAM nest for some of us. :lol: 

Oddly enough - there was some indicating in CIPS guidance that tomorrow would be a stronger event. Would be funny if that happened. 

Horribly boring stretch we are in if these few days fail - other than smoke we have had barely a thing to track. 

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14 minutes ago, vastateofmind said:

Cloudy again, but currently 85/70 at Ft. Belvoir. Feels pretty gross out there.

Feels like a steam shower out there even with the clouds rolled in. 

One thing I knew was certain - this thread would be full of complaints before the line of storms even formed. :P

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5 minutes ago, nj2va said:

Feels like a steam shower out there even with the clouds rolled in. 

One thing I knew was certain - this thread would be full of complaints before the line of storms even formed. :P

Just wait until Owings Mills and Baltimore city get a 2” deluge and I get skipped.  :lol:
 

Cloudy now after some sun this morning.

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3 minutes ago, yoda said:

ENH risk nudged westward a tad on 1630z OTLK towards i81 corridor 

Pretty abysmal hail risk in our region now on the probs, however. Enhanced for wind still, of course. The SPC discussion is a little meh worthy honestly. 

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1 minute ago, Kmlwx said:

Bold probs!

yeah, but its such a large area under the MD, it's hard to say how great it will be for us. SPC discussion on it isn't super great for us.

 

Current expectations are for thunderstorms to continue developing
   across the higher terrain of the Appalachians, and perhaps the
   surface lee trough, as weak ascent associated with an upper
   trough/low centered over the Great Lakes overspreads the
   Mid-Atlantic. Convection is already ongoing across parts of PA and
   western/southern NY, with a measured severe gust recently recorded
   at KDKK in far western NY. Weaker forcing across the Carolinas casts
   some uncertainty regarding overall thunderstorm coverage with
   southward extent. Better mid-level flow around the base of the upper
   trough/low should tend to remain over the Carolinas through the day.
   30-40 kt of deep-layer shear across NC/SC will support some threat
   for supercells and large hail with initial development.

   Across the Mid-Atlantic, effective bulk shear should be somewhat
   weaker, generally in the 20-30 kt range. Mainly multicells/clusters
   should be the dominant mode across this region, with perhaps
   isolated/marginal supercells possible. Wherever enough clearing can
   occur to promote steep low-level lapse rates, a threat for damaging
   downdraft winds will exist. Multiple corridors of potentially
   greater coverage of scattered to numerous damaging gusts are evident
   based on observational and short-term guidance trends. One such
   possible corridor is across eastern PA into NJ. Multiple Severe
   Thunderstorm Watches will likely be needed this afternoon across the
   Mid-Atlantic and Carolinas to address the increasing threat for
   damaging winds and severe hail.
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