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2017 Severe Thread


mappy

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Just now, pazzo83 said:

Take pretty pictures for us coastal folk.  Our dews are still in the mid 50s (#NotGonnaHappen)

You're in the wrong subforum. Central PA, out towards State College is where you should go. We will see a few gusty showers, maybe. 

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4 minutes ago, mappy said:

You're in the wrong subforum. Central PA, out towards State College is where you should go. We will see a few gusty showers, maybe. 

More action in here, and in our sub all we have is Yanksfan salivating about more rain.

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3 minutes ago, Kmlwx said:

Another little bubble of clearing to the W of Culpeper it seems. Nothing substantial though - still a lot of clouds around the area. Wish we had that pocket of clearing that Harrisburg has...

Then you have us in Charlottesville.... Basically looks like CAD out there except with a southerly wind. Talk about saturated lower levels to get that orographic lift + strong low-level wind to do that. 

Who ever gets to the 82-87 degree range has a shot... Otherwise, I'm pretty "meh" on this around here in Central VA. 

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Hate that the storm motion is strongly SW-NE. Would have been much more apt to work with a more westerly trajectory with these storms. 

17z HRRR and other short-range guidance takes that severe line out in western PA and sends it into the land of Tim Hortons after passing through western NY. 

Rest of the convection is supposedly coming from WV/VA later in the afternoon. 

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LWX seems really gung ho in their afternoon AFD:

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
310 PM EDT Mon May 1 2017

.SYNOPSIS...
A strong cold front will pass through the region tonight. High
pressure will bring cooler and drier weather during the middle
of the week. Low pressure will move into the area late in the
week.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Hazardous weather expected across the Mid-Atlantic region
late this afternoon and evening. Strong to severe thunderstorms
are likely. Interested parties should stay tuned into the
changing weather through tonight.

A strong cold front will continue to approach from the west. A
strong pressure gradient between the cold front and high
pressure over the Atlantic has allowed for gusty southerly
winds. Frequent gusts around 30 to 35 mph will continue through
early this evening. The southerly flow has ushered in warm and
humid conditions. Dewpoints will remain well into the 60s and
max temps will be in the lower 80s across most locations.

The warm and humid airmass has lead to some instability. Latest
mesoanalysis shows around 500-1000 j/kg of mlcape which should
last into this evening. Shear profiles will be quite impressive
due to a strengthening jet associated with the cold front. The
combination of forcing from the cold front...the instability and
the strong shear profiles enhances the threat for severe
thunderstorms late this afternoon and evening. Damaging winds
will be the primary threat...but isolated tornadoes and large
hail are also possible in thunderstorms that develop during this
time.

The first round of convection is likely to propagate in from the
southwest well ahead of the cold front during the mid to late
afternoon hours. Severe thunderstorms are possible during this
time...but confidence is low since the strongest forcing from
the mid and upper-level jet as well as the cold front should
remain well off to the west. Those features will move into the
area from the west by early this evening. This is when
confidence for severe thunderstorms is highest. The highest
instability...shear and forcing should be for locations near
and west of the Blue Ridge and Catoctin Mountains early this
evening...best chance between 21 and 02z. Farther
east...confidence is a bit lower for severe weather since peak
heating will have passed and the outflow may outrun some of the
stronger storms since the storm motion will be southwest to
northeast. Having that been said...the wind fields will remain
quite strong through this evening and there will still be some
instability due to the unusually warm and humid airmass in
place. Therefore...severe thunderstorms are still possible near
and east of Interstate 95 this evening...best chance between 00z
and 04z.

The wind field should begin to dissipate after 04z...but the
cold front will not pass through the entire area until late
tonight. Therefore...additional convection is possible overnight
mainly east of the Blue Ridge Mountains. Noticeably drier
conditions are expected behind the front toward morning.
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