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2016 Severe Weather Thread


downeastnc

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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RALEIGH NC
727 AM EDT FRI JUL 8 2016

NCZ007>011-021>028-038>043-073>077-083-084-091130-
PERSON-GRANVILLE-VANCE-WARREN-HALIFAX-FORSYTH-GUILFORD-ALAMANCE-
ORANGE-DURHAM-FRANKLIN-NASH-EDGECOMBE-DAVIDSON-RANDOLPH-CHATHAM-WAKE-
JOHNSTON-WILSON-STANLY-MONTGOMERY-MOORE-LEE-HARNETT-ANSON-RICHMOND-
727 AM EDT FRI JUL 8 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

ISOLATED THUNDERSTORMS WILL DEVELOP OVER OR TRACK INTO THE
WESTERN PIEDMONT THIS AFTERNOON...THEN PROGRESS EAST ACROSS THE
TRIANGLE AND NORTHERN PIEDMONT BY LATE AFTERNOON AND EARLY
EVENING. A FEW STORMS COULD BECOME SEVERE...WITH A PRIMARY THREAT
OF DAMAGING WINDS AND QUARTER SIZE HAIL. DESTRUCTIVE WINDS AS HIGH
AS 70 MPH WILL BE POSSIBLE IF THUNDERSTORMS ORGANIZE INTO A SQUALL
LINE...PRIMARILY ALONG AND EAST OF HIGHWAY 1.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING.

 

------------------------------------------------------------------------------------------------------------

 

Wording goes well with the 30% props in the grids.

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Portion of the AFD from RAH:

 

Steep mid-level lapse rates (6.5-7.5 c/km), strong insolation and
seasonable moisture will yield moderate to strong diurnal
destabilization (1500-2500 J/kg) this afternoon, while steep low
level lapse rates /inverted-V profiles/ beneath steep mid-level
lapse rates /dry air aloft/ attendant the EML foster borderline
extreme DCAPE (1500-2000 J/kg), especially along/east of Highway 1.
With central NC positioned on the southern fringe of the westerlies,
deep-layer shear will fall somewhere in the 20-30 kt range. Though
shear of this magnitude is generally too weak to support updraft
rotation, steep mid-level lapse rates and moderate/strong
instability could compensate and allow at least transient mid-level
rotation /supercellular characteristics/ with an attendant threat
for damaging winds and severe hail. Whether convection develops over
or propagates downstream into central NC (assuming one or the other
occurs), the greatest severe weather concern will be a conditional
potential for widespread destructive winds given a kinematic
environment supportive of convective organization, consolidation,
and upscale growth along outflow in the presence of an atypically
robust thermodynamic environment capable of generating/sustaining
strong cold pools and enhanced downbursts via downward momentum
transport of speedy mid-level flow (30-35 kt at H7). -Vincent

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And from SPC (Central NC in a slight risk):

 

...LOWER OH RIVER AND KY/TN TO SOUTHERN APPALACHIANS/CAROLINAS...
AN MCV RELATED TO A DECAYING MCS IS LOCATED OVER THE LOWER OH RIVER
EARLY THIS MORNING INCLUDING PARTS OF WESTERN KY AND FAR SOUTHEAST
IL/SOUTHERN INDIANA. FORCING FOR ASCENT AND AN ENHANCED BELT OF
WESTERLY WINDS /OBSERVED BY REGIONAL WSR-88D VWP/ SHOULD CONTRIBUTE
TO AN INTENSIFICATION OF THUNDERSTORMS BY AFTERNOON ACROSS
KY/ADJACENT TN EAST-SOUTHEASTWARD TO THE SOUTHERN APPALACHIANS AND
EVENTUALLY ADDITIONAL PORTIONS OF THE CAROLINAS. THE 12Z OBSERVED
SOUNDING FROM NASHVILLE SAMPLED VERY STEEP MID-LEVEL LAPSE
RATES...WHICH WILL CONTINUE TO ADVECT EASTWARD AND CONTRIBUTE TO
MODERATE TO STRONG DESTABILIZATION ACROSS THE REGION. MODERATE
SHEAR...PARTICULARLY IN PROXIMITY TO THE AFOREMENTIONED MCV...WILL
SUPPORT PERSISTENT/ORGANIZED EAST/SOUTHEASTWARD-SPREADING LINEAR
CLUSTERS WITH WIND DAMAGE AS THE MOST COMMON SEVERE RISK THIS
AFTERNOON AND EVENING.

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Gotta watch for that leeside trough to fire off a line in a bit and there looks to be some kind of boundry forming SE of RDU and maybe just east of Fayetteville....pops up in the last few frames of the vis loop, not sure what it is, shouldnt be a marine layer with the west flow and its not a seabreeze front either.

 

http://www.ssd.noaa.gov/goes/east/wfo/rah/mflash-vis.html

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Looks like a greater threat for more severe storms than we saw yesterday. This was the noon briefing from RAH. They are expecting scattered severe storms now, not isolated, in the Triad between 3 and 6, and the Triangle eastward between 6 and 10. And this was done before the SPC put western NC in the enhanced risk.

 

http://www.weather.gov/media/rah/briefing/NWSRaleighLatestBriefing.pdf?platform=hootsuite

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Yes, HRRR has not been too consistently produced today; maybe it will come back before later afternoon.

 

It is a complex configuration with many interacting features, some that appear less than active but it does seem closer to being very active overall.

 

wv-animated.gif

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mcd1208.gif

MESOSCALE DISCUSSION 1208 NWS STORM PREDICTION CENTER NORMAN OK 0232 PM CDT FRI JUL 08 2016 AREAS AFFECTED...PORTIONS OF SOUTHERN WV...WESTERN VA AND NORTHWEST NC CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 081932Z - 082100Z PROBABILITY OF WATCH ISSUANCE...60 PERCENT SUMMARY...A DAMAGING WIND AND HAIL THREAT WILL SPREAD SOUTHEAST ACROSS PARTS OF WESTERN VA/NC INTO THE EVENING. A WATCH MAY BE NEEDED IN THE NEXT COUPLE OF HOURS. DISCUSSION...A LINE OF CONVECTION ACROSS SRN WV HAS SHOWN SIGNS OF MAINTAINING FORWARD PROPAGATION AND SEVERE WIND THREAT LATE THIS AFTERNOON. THIS CLUSTER OF STORMS WILL CONTINUE TRACKING E/SE INTO PARTS OF WRN VA/NC WHERE A STRONGLY UNSTABLE AIRMASS RESIDES WITH DEWPOINTS IN THE 70S. WHILE EFFECTIVE SHEAR IS MODEST...DEGREE OF INSTABILITY AND STEEP MID AND LOW LEVEL LAPSE RATES SHOULD CONTINUE TO SUPPORT A DAMAGING WIND AND HAIL THREAT INTO THE EVENING HOURS. IN PARTICULAR...THE DAMAGING WIND THREAT MAY INCREASE JUST TO THE EAST OF THE MOUNTAINS WHERE TEMPERATURES WERE IN THE 90S AND LOW LEVEL LAPSE RATES/DCAPE INCREASE SUBSTANTIALLY. AS SUCH...A WATCH MAY BE NEEDED DOWNSTREAM OF WW 357 IN THE NEXT 1-2 HOURS. ..LEITMAN/THOMPSON.. 07/08/2016

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Watch coming for the Triangle area by 630pm

 

Should be interesting, gotta watch for these pop up storms in the really unstable air mass they will go nuts fast....one NW of Rocky Mount for example if that fires off a segment then it will tap into some really unstable air, if we wait on that line back in VA instability will be dropping so it might not be as bad by then...

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Watch is out until midnight.

Watch county notification for watch 363

National Weather Service Raleigh NC

620 PM EDT Fri Jul 8 2016

The National Weather Service has issued Severe Thunderstorm Watch 363 in effect until Midnight EDT tonight for the following areas

In North Carolina this watch includes 31 counties

In Central North Carolina

Alamance Anson Chatham Cumberland Davidson Durham Edgecombe Forsyth Franklin Granville Guilford Halifax Harnett Hoke Johnston Lee Montgomery Moore Nash Orange person Randolph Richmond Sampson Scotland stanly Vance Wake Warren Wayne

Wilson

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