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2014 Severe Storm season


downeastnc

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I will be watching Meso Analysis today, could be an interesting day for the central/eastern parts of NC.  Have a nice southerly flow colliding with an east moving boundary and jet max during the prime heat of the day.  Could have a tornadic cell or two even though this is pretty unseasonable for that area.  Should be interesting to watch unfold though currently there isn't much support from the HRRR.  We shall see.  Also looks like tomorrow will be active.

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Matthew East had this to say on facebook:

 

1:21pm: Showers/ a couple of stormd developing in Wilkes & Surry county. A few severe storms possible later this PM.

 

1:26pm: Lots of showers/ storms developing in SC and GA. Will impact parts of NC this PM.

 

 

Storms on radar in SC looked to be in clusters and lines.

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mcd1327.gif

 

MESOSCALE DISCUSSION 1327
NWS STORM PREDICTION CENTER NORMAN OK
1251 PM CDT WED JUL 09 2014

AREAS AFFECTED...NE GA...SC...WRN NC...SRN VA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 091751Z - 091915Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...AN ISOLATED SEVERE THREAT MAY DEVELOP ACROSS PARTS OF ERN
GA...THE WRN CAROLINAS AND SRN VA. MARGINALLY SEVERE WIND GUSTS
WOULD BE THE PRIMARY THREAT. WW ISSUANCE APPEARS UNLIKELY.

DISCUSSION...THE LATEST SFC ANALYSIS SHOWS A COLD FRONT MOVING EWD
ACROSS THE OH VALLEY WITH SOUTH TO SOUTHWESTERLY FLOW LOCATED ACROSS
MUCH OF THE SRN AND CNTRL APPALACHIAN MTNS. SFC DEWPOINTS ARE IN THE
MID TO UPPER 60S F ACROSS THE MCD AREA WITH MODERATE INSTABILITY
DEVELOPING ALONG A CORRIDOR FROM ERN GA NNEWD ACROSS THE WRN
CAROLINAS INTO VA. MLCAPE IS ESTIMATED AROUND 1500 J/KG ALONG MUCH
OF THIS CORRIDOR BY RAP-V2 DATA. IN ADDITION...THE WSR-88D VWP AT
RAONOKE VA SHOWS A UNIDIRECTIONAL WIND PROFILE WITH 30 TO 40 KT OF
FLOW ABOVE 2 KM AGL. THIS ALONG WITH STEEPENING LOW-LEVEL LAPSE
RATES THIS AFTERNOON...SHOULD BE ENOUGH FOR A MARGINAL WIND-DAMAGE
THREAT WITH CELL MERGERS AND SHORT-LINE SEGMENTS.

..BROYLES/EDWARDS.. 07/09/2014

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Currently the best looking cell on radar right now is southwest of Chatham, VA and moving east.  Just intersected a boundary so it should show some rotation on radar.  Also some decent discrete cells popping up around RDU and SW.  Lots of lightning on the cell near Sanford.

 

Edit: Also cell near Clayton just blew up and was so close to the radar I didn't see it.  Very impressive.

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Interesting to see what happens if this line gets east, per the mesoanalysis ENC is pretty unstable.

 

MHX.gif

 

Yeah, noon hodograph for KMHX looks to have pretty stout parcel growth with decent lapse rates in the low to mid levels.  Would really improve if surface winds could pick up.  LLJ will kick in as the sun goes down so we shall see. 

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Edit: Also cell near Clayton just blew up and was so close to the radar I didn't see it.  Very impressive.

That's the problem I have living so close to the radar site. Sometimes it doesn't get a good capture of what's going on overhead IMBY. That Clayton cell that grazed us sent out one clap of thunder that sounded like a  cannon on the back porch!

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That's the problem I have living so close to the radar site. Sometimes it doesn't get a good capture of what's going on overhead IMBY. That Clayton cell that grazed us sent out one clap of thunder that sounded like a  cannon on the back porch!

 

Yeah living in the mountains we have our radar blocks but I bet its pretty rough watching a storm for 45 or so minutes, only to lose it on radar as it get to your backyard.

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Cell SE of Murfreesboro, NC looks ominous.  Has broad rotation and 45k+ tops with a good bit of lightning showing up.  Could potentially see a tor warning at some point in time.  Cells on VA/NC line in eastern NC are getting into a better environment with better EHI so structure should start to improve.

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The problem lately is every time the forecasters mention there is a good chance of storms, especially the local ones, it never seems to happen. Now I saw them say the coverage should be wider tomorrow. We'll see. They have said that before.

It happened. It just didn't happen to you.

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No, it's mor elike the local mets saying things on facebook like there are storms popping up and moving our way, and then they never happen here.

 

False....again with they hyperbole.  Pop-up showers and storms are erratic in both their development and movement.  This isn't a shock.  It does suck when you're not the one getting the rain (but you don't like showers/storms anyway...you like sunny and hot).

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False....again with they hyperbole.  Pop-up showers and storms are erratic in both their development and movement.  This isn't a shock.  It does suck when you're not the one getting the rain (but you don't like showers/storms anyway...you like sunny and hot).

 

I wasn't talking about pop-up showers. Yesterday it was supposedly a line of storms heading east.

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I wasn't talking about pop-up showers. Yesterday it was supposedly a line of storms heading east.

 

Really?  I didn't hear that one.  I can't get facebook at work though.  I thought it was supposed to be general showers and storms developing, waxing and waning as they moved along.  I usually just read the NWS discussion to gain an understanding of what features will be responsible for initiating, maintaining, and propagating convection and then follow radar trends.

 

Yesterday, we had a stalled/slow moving cold front to the west of the state and a differntial heating boundary through the center of the area.  With decent instability and high moisture content, the environment seemed favorable for general, non-organized convection (read low severe threat and random evolution and dissipation of storms).  And that's what we got.

 

Today, we have the same cold front moving farther east.  We have general instability and high moisture content.  There are probably some outflow boundaries around too.  There are enough mechanisms present to warrant a high chance of rain.  But if you're expecting an organized line of storms that moves through the whole area and soaks everyone with rain, then I would reset that expectation.  Showers and storms are likely to pop up (and maybe even in a linear shape!) and provide greater coverage than yesterday, but not everyone will get wet...yet again.

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Severe thunderstorm watch until 9:00 pm.

 

 136 PM EDT Thu Jul 10 2014


The National Weather Service has issued Severe Thunderstorm Watch
410 in effect until 9 PM EDT this evening for the following areas

In North Carolina this watch includes 14 counties

In central North Carolina

Cumberland            Edgecombe             Franklin            
Halifax               Harnett               Hoke                
Johnston              Nash                  Sampson             
Scotland              wake                  Warren              
Wayne                 Wilson               

This includes the cities of...Angier...Benson...Cary...Clayton...
Clinton...Dunn...Erwin...Fayetteville...Franklinton...Goldsboro...
Laurinburg...Lillington...Louisburg...Nashville...Norlina...
Raeford...Raleigh...Red Oak...Roanoke Rapids...Rockfish...
Rocky Mount...Selma...Sharpsburg...Silver City...Smithfield...
Spring Hope...Warrenton and Wilson.


 
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Severe thunderstorm watch until 9:00 pm.

 

 136 PM EDT Thu Jul 10 2014

The National Weather Service has issued Severe Thunderstorm Watch

410 in effect until 9 PM EDT this evening for the following areas

In North Carolina this watch includes 14 counties

In central North Carolina

Cumberland            Edgecombe             Franklin            

Halifax               Harnett               Hoke                

Johnston              Nash                  Sampson             

Scotland              wake                  Warren              

Wayne                 Wilson               

This includes the cities of...Angier...Benson...Cary...Clayton...

Clinton...Dunn...Erwin...Fayetteville...Franklinton...Goldsboro...

Laurinburg...Lillington...Louisburg...Nashville...Norlina...

Raeford...Raleigh...Red Oak...Roanoke Rapids...Rockfish...

Rocky Mount...Selma...Sharpsburg...Silver City...Smithfield...

Spring Hope...Warrenton and Wilson.

 

 

 

 

Yep, it looks like the western edge of the watch depicts very well the initiation point of the storms.

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mcd1338.gif

 MESOSCALE DISCUSSION 1338
   NWS STORM PREDICTION CENTER NORMAN OK
   0315 PM CDT THU JUL 10 2014

   AREAS AFFECTED...SERN VA...ERN NC...ERN SC

   CONCERNING...SEVERE THUNDERSTORM WATCH 410...

   VALID 102015Z - 102115Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 410
   CONTINUES.

   SUMMARY...SCT-NUMEROUS THUNDERSTORMS WILL PERSIST ACROSS THE REGION
   FOR THE NEXT FEW HOURS.  DAMAGING WINDS REMAIN POSSIBLE WITH THE
   STRONGEST ACTIVITY.

   DISCUSSION...SUBSTANTIAL CONVECTIVE OVERTURNING WILL GRADUALLY
   STABILIZE MUCH OF THE AIR MASS ACROSS WW410.  CONVECTIVELY AIDED SEA
   BREEZE HAS SURGED INLAND AND APPEARS TO BE PARTLY RESPONSIBLE FOR
   SW-NE ORIENTED BAND OF STRONG STORMS THROUGH THE MIDDLE OF THE
   CURRENT WATCH.  WHILE NEW STORMS SHOULD CONTINUE TO DEVELOP ALONG
   STRONGER OUTFLOW BOUNDARIES...IT APPEARS MORE ROBUST CONVECTION MAY
   CONCENTRATE ACROSS ERN SC WHERE STEEPER LAPSE RATES HAVE YET TO BE
   OVERTURNED.  STRONG WINDS AND MARGINALLY SEVERE HAIL REMAIN THE
   PRIMARY THREATS.

   ..DARROW.. 07/10/2014
 

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Strong line heading out of Greenville with a few areas of rotation but nothing getting its act together.  Washington current has surface helicity values of 100+ so it will be interesting to see what happens with these cells.  Lots of lightning on the cell near Beargrass.

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