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New England Convective Discussion


weatherwiz
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32 minutes ago, USCAPEWEATHERAF said:

Area of showers and storms to my southwest, look to impact the Cape and Islands by midday, could become severe ass dew points are in the 70s here already.  We have mostly sunny skies.

severe ass indeed

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The HRRR continues to be all over. 

Anyways some notes...

The 12z OKX sounding was pretty damn impressive looking IMO. Looking at BUF/PIT soundings there are the hints of the strengthening mlvl flow too. 

Satellite/radar is a little on the concerning side with a line of activity developing across PA/SE NY. 

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1 minute ago, Damage In Tolland said:

Watch the Cape pull another Tor this morning with that stuff moving onshore shortly 

This water temperature pocket in the region is allowing the energy needed to sustain and create this extreme weather event.  If we don't get a tropical cyclone to properly cool the water, we will have a slow winter to start on the Cape.  Again we don't big winters anyways.  However, if the energy remains big nor'easters will dump heavy snow on RI to Worcester and points west to Hartford and Springfield, but the I95 corridor south and east will see mostly rain.

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27 minutes ago, USCAPEWEATHERAF said:

The amazingly warm water temperatures near the region will allow another hurricane or severe weather event to occur before the fall arrives.  It is not a good thing to have this high of a reservoir of warmth and incredible energy present.

Cough cough *upwelling* cough.

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27 minutes ago, weatherwiz said:

The HRRR continues to be all over. 

Anyways some notes...

The 12z OKX sounding was pretty damn impressive looking IMO. Looking at BUF/PIT soundings there are the hints of the strengthening mlvl flow too. 

Satellite/radar is a little on the concerning side with a line of activity developing across PA/SE NY. 

Gonna be tough to realize high instability with all these low clouds hanging around. 

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6 minutes ago, Hoth said:

Gonna be tough to realize high instability with all these low clouds hanging around. 

Yeah it is. the OKX sounding forecasts right around 2000 J MLCAPE later on...which would be pretty significant. SPC mentions 1000-1500...I think if it became apparent 2000 was going to realize over a large area we would see an enhanced risk (for damaging wind...maybe hail) 

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63/62  light rain .13"

Maybe someone can explain how NNE is in a slight risk today?  Warm front still south of me.  Bit of clearing in VT before that convective line comes through.  No real clearing behind it.  I don't see any real warming/clearing so everything looks to be south of around Manchester NH today.  Am I missing something?

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2 minutes ago, wxeyeNH said:

63/62  light rain .13"

Maybe someone can explain how NNE is in a slight risk today?  Warm front still south of me.  Bit of clearing in VT before that convective line comes through.  No real clearing behind it.  I don't see any real warming/clearing so everything looks to be south of around Manchester NH today.  Am I missing something?

Warm front is crawling north. 72/68 at MHT now but 62/61 and 0.14” rain here. Here northward may be screwed though. You always have to be pessimistic about wet warm fropas up here. The wedges hold strong. 

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1 hour ago, dryslot said:

68/63, Not exactly swampy, Going to need some heating if we want to make things interesting.

That first bunch seems to be weakening as it hits the Maine mank.  It stays south of me but might wet the ground in LEW.  2nd area now in ENY looks more promising, though it wouldn't surprise me to see its southerly "tail" disappear so the rest slides by to the north - kinda like Monday.  We do fine with stratiform, generally terrible with convective.

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3 minutes ago, dendrite said:

Warm front is crawling north. 72/68 at MHT now but 62/61 and 0.14” rain here. Here northward may be screwed though. You always have to be pessimistic about wet warm fropas up here. The wedges hold strong. 

Seems like winter when the warm air gets to about the famous Canterbury rest area and stalls. Will be interesting to see if it can punch through.  Congrats SNE although unlike a 12" snow storm,  severe thunderstorms cause real damage.   

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STWatches coming in a few hours 

https://www.spc.noaa.gov/products/md/md1825.html

Mesoscale Discussion 1825
   NWS Storm Prediction Center Norman OK
   1031 AM CDT Wed Aug 21 2019

   Areas affected...Northern Mid Atlantic Coast region through southern
   New England

   Concerning...Severe potential...Watch possible 

   Valid 211531Z - 211730Z

   Probability of Watch Issuance...60 percent

   SUMMARY...Intensifying thunderstorms posing a risk for potentially
   damaging wind gusts and, perhaps, an isolated tornado or two, appear
   increasingly possible by 2-4 PM EDT.  This could require the
   issuance of one or two severe weather watches.

   DISCUSSION...Convective development appears to be undergoing at
   least some gradual intensification, within a narrow band now
   overspreading the Champlain and Hudson Valleys, and as far south as
   northern New Jersey.  This appears to be occurring on the leading
   edge of mid-level forcing for ascent associated with a remnant
   convectively generated or enhanced perturbation, which is forecast
   to progress into and through western and northern New England by mid
   to late afternoon.  This may be trailed to the southwest by another
   area of mid-level forcing for ascent spreading northeastward across
   the northern Mid Atlantic Coast region into southern New England.

   Based on latest observational data, seasonably moist boundary layer
   air may mostly remain confined to the south of a weak surface front,
   reinforced by rain-cooled air associated with weakening convection
   preceding the main ongoing band.  This extends roughly from the
   leading edge of the convective band across northern Massachusetts,
   though this boundary could shift northward some into and through the
   afternoon.

   To the south of the front, insolation during the next few hours is
   expected to contribute to moderate mixed-layer CAPE of 1000-2000
   J/kg, coincident with strengthening of west-southwesterly flow in
   the 700-500 mb layer.  This may contribute to an environment
   increasingly conducive to organized convection by 18-20Z, which
   could include further intensification of the ongoing line and
   perhaps additional discrete storms, with supercell structures
   possible.  Although low-level hodographs may be somewhat modest in
   size, a tornado or two might not be out of the question, mainly near
   the surface boundary across southern New England.  Otherwise,
   strongest storms probably will pose a risk for potentially damaging
   wind gusts.

   ..Kerr/Guyer.. 08/21/2019

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...GYX...BOX...BTV...OKX...ALY...PHI...BGM...CTP...
   LWX...
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