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2017 General Severe Weather thread


downeastnc

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Doesn't really feel like a stormy day outside, but the models seem to want to show some severe storms around here tonight into tomorrow. Seems we have to have some incredible dynamics to get any kind of storm around here now. 90% of the time the past few years if there is talk of severe storms or we are under a watch it ends up not having any storms at all around the Triangle. Forecasting severe weather here seems just as hard as forecasting snow now.

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4 minutes ago, mackerel_sky said:

This big slug of moderate / light rain moving through the Carolinas , should kill any severe chances, if you were wanting that kind of thing.

[bt] It'll actually make it more humid and give the storms more instability to work with! [/bt]

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1 minute ago, Cold Rain said:

[bt] It'll actually make it more humid and give the storms more instability to work with! [/bt]

It could if it happened this morning and then the sun came out afterwards. But too late for that now. Soundings have been showing several rounds of storms here overnight, though, and favorable for tornadoes. Guess we can't let our guard down yet.

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18 minutes ago, Brick Tamland said:

It could if it happened this morning and then the sun came out afterwards. But too late for that now. Soundings have been showing several rounds of storms here overnight, though, and favorable for tornadoes. Guess we can't let our guard down yet.

The latest HRRRRR^RRRRRR*RRRRRR gives us a robust amount of rain.  I didn't look at soundings, but the storms didn't look very vigorous on the future radar.

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Rainfall amounts are gonna be pretty varied some will get 2-3" others hardly anything thats the nature of these events this time of year. Timing is still the big issue I think, the soundings on NAM and HRRR are still rather bad overnight but the overall setup lacks instability, so thats why we dont have anythng more than a marginal threat with this type of setup which has a windfield supporting rotation but apparently the storm mode will prevent the taking advantage of it. We could get a upgrade if they see signs of more instability but really these just dont tend to work out.

 

From SPC....

..South Atlantic Coast States...
   12Z observed soundings sampled poor mid-level lapse rates and
   minimal buoyancy north of FL. While destabilization is ongoing
   downstream of an extensive (yet weakening) QLCS over the Gulf and
   eastern FL Panhandle, parallel stratiform across a large part of GA
   should confine weak surface-based buoyancy to the coastal plains
   this afternoon before possibly developing towards the Piedmont
   tonight. Localized damaging winds and a brief tornado will remain
   possible with the remnant northern portion of the QLCS, which may
   progress across parts of north FL to south SC this afternoon.

   A shortwave impulse currently over the Lower MS Valley should eject
   through the base of the upper trough towards the Carolinas. This
   will yield strengthening meridional flow overspreading the modifying
   warm sector in the eastern Carolinas/southeast Virginia tonight.
   Although instability should remain limited, enlarging low-level
   hodographs will support risks of a brief tornado and locally
   damaging winds. Should greater instability become observationally
   evident, parts of the region may be upgraded to Slight Risk in later
   outlooks.
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Another TOR Warning, this one issued by CAE WFO


BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
826 PM EDT THU MAY 4 2017

The National Weather Service in Columbia has issued a

* Tornado Warning for...
  Northwestern Clarendon County in central South Carolina...
  South central Sumter County in central South Carolina...

* Until 900 PM EDT

* At 826 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Summerton, or 10 miles west of Manning, moving
  north at 35 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without
           shelter. Mobile homes will be damaged or destroyed.
           Damage to roofs, windows, and vehicles will occur.  Tree
           damage is likely.

* This dangerous storm will be near...
  Sumter around 855 PM EDT.
  South Sumter and Millwood around 900 PM EDT.

Other locations impacted by this tornadic thunderstorm include Cane
Savannah, Paxville, Lakewood, Privateer and Pinewood.
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19 minutes ago, Hvward said:

Looks like it just crossed I-95 TDS still intact. Hopefully those traveling saw it and took shelter. Daniel Shaw looks to be there so he will cover any damage.7dae1d5a32e3afda624eeb2cd3b683cc.png

Nasty hope this isn't a sign of how the night is going to go......still several couplets in SC.....that southern one looks especially nasty

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Tornadic cell in SC is pretty nasty and sustaining a couplet, or two. Storm is open to the south so it should hold it together for a while as well. Eastern couplet looks to be trying to take over or maybe a satellite tornado to the larger broad rotation. Either way this is a very dangerous storm.

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New tornado warning headed for Marion SC....

 

Tornado Warning

Tornado Warning
SCC041-067-050315-
/O.NEW.KILM.TO.W.0006.170505T0236Z-170505T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wilmington NC
1036 PM EDT THU MAY 4 2017

The National Weather Service in Wilmington has issued a

* Tornado Warning for...
  Southeastern Florence County in northeastern South Carolina...
  Marion County in northeastern South Carolina...

* Until 1115 PM EDT

* At 1036 PM EDT, a severe thunderstorm capable of producing a
  tornado was located over Kingsburg, or 14 miles east of Lake City,
  moving north at 30 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Expect damage to mobile homes, roofs, and vehicles.

* Locations impacted include...
  Marion, Mullins, Johnsonville, Zion, Hannah, Gapway, Poston, Rains,
  Gresham, Smithboro, Kingsburg, Brittons Neck and Carolinas Hospital
  System - Marion.
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SPC Day 1 Convective Outlook:

590c173f83838_day1otlk_1200(1).gif.8cafa946395d2eeec0dd42f35669c550.gif

...Mid-Atlantic Vicinity...

   Bands of pre-frontal convection will continue to lift northeast
   across the region this morning, eventually moving offshore during
   the afternoon. These storms, mainly across eastern NC/VA will pose a
   threat for strong, locally damaging wind gusts and perhaps a tornado
   as strong southerly deep layer shear continues to stream across the
   region and rich boundary layer moisture hugs the coastal plain.  As
   midlevel height falls occur and somewhat steeper lapse rates
   overspread the area as the upper trough becomes increasingly
   negatively tilted, additional storms may develop across the Piedmont
   of NC/VA. However, given the amount of morning/early afternoon
   convection, it is unclear how much airmass recovery/destabilization
   may occur. Additionally, hi-res CAMs vary in coverage and intensity
   of afternoon convection. Should storms form, a severe threat could
   accompany them, but confidence is too low for introduction of any
   higher probability risk at this time. 

   Further north toward PA thunderstorms will develop during the
   afternoon as modest destabilization occurs. Steep lapse rates with
   cold temperatures aloft in the vicinity of the northeastward
   advancing surface low and upper trough will lead to a marginal hail
   threat and perhaps some gusty winds given strong deep-layer shear
   and fast storm motions. While unlikely, a weak/brief tornado can not
   be ruled out in the presence of backing low-level winds ahead of the
   surface low. However, modest boundary layer moisture and weak
   instability should limit the overall threat.
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