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2015 Severe Weather Thread


Hvward

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I know we got a few posters in Siler City, I hope they are paying attention cause they are about to get hammered, must be a nice low wall cloud with that rotation and its gonna pass right over Siler City it looks like.....still no warning of any kind on that cell though...

 

its got maybe 10-15 more mins to produce before that cell to the south runs into it ......

 

new couplet with the Sandford storm as well forming way back near where the other one was

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The National Weather Service in Raleigh has issued a

* Severe Thunderstorm Warning for...

  southeastern Chatham County in central North Carolina...

  southwestern Wake County in central North Carolina...

  northern Harnett County in central North Carolina...

  Lee County in central North Carolina...

* until 700 PM EDT

* at 613 PM EDT...Doppler radar indicated a severe thunderstorm

  capable of producing quarter size hail and damaging winds in excess

  of 58 mph. This storm was located 8 miles northeast of Sanford...

  and moving east at 30 mph.

* Locations impacted include...

  Cary...Sanford...Lillington...Fuquay-Varina...Angier...apex...Holly

  Springs...Broadway...Seminole and Cumnock.

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Mesoscale Discussion 1215

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mcd1215.gif


MESOSCALE DISCUSSION 1215

NWS STORM PREDICTION CENTER NORMAN OK

0523 PM CDT SAT JUN 27 2015

AREAS AFFECTED...CAROLINA AND VIRGINIA PIEDMONT INTO COASTAL AREAS

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 272223Z - 280030Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...AT LEAST SCATTERED THUNDERSTORM DEVELOPMENT IS EXPECTED TO

CONTINUE TO DEVELOP ACROSS MUCH OF THE REGION THROUGH MID TO LATE

EVENING. DAMAGING WIND GUSTS APPEAR THE PRIMARY THREAT IN STRONGER

STORMS. THE POTENTIAL FOR UPSCALE CONVECTIVE GROWTH INTO AN

EVOLVING MESOSCALE CONVECTIVE SYSTEM REMAINS UNCLEAR...BUT SEEMS LOW

AT THIS POINT. UNLESS THIS OCCURS...THE SEVERE WIND POTENTIAL MAY

REMAIN SOMEWHAT SPOTTY IN NATURE.

DISCUSSION...DUE TO GENERALLY WEAK LOWER/MID TROPOSPHERIC LAPSE

RATES AND LIMITED SURFACE HEATING...MIXED LAYER CAPE ACROSS MUCH OF

THE REGION IS RATHER MODEST...TO THE SOUTH OF A CONVECTIVELY

REINFORCED FRONTAL ZONE ACROSS THE EASTERN VIRGINIA PANHANDLE AND

NORTHERN VIRGINIA INTO THE DELMARVA PENINSULA. ASIDE FROM A

CORRIDOR OF STRONGER HEATING TO AROUND 90F ACROSS THE SOUTH CAROLINA

PIEDMONT...WHERE CAPE MAY BE IN EXCESS OF 2000 J/KG... VALUES APPEAR

GENERALLY ON THE ORDER OF 1000-1500 J/KG ELSEWHERE.

IN THE WAKE OF THE CONVECTIVE BAND NOW SPREADING INTO/THROUGH THE

DELMARVA PENINSULA...SOUTHERLY 850 MB FLOW /AND LOW-LEVEL SHEAR/ IS

FAIRLY WEAK. BUT SOUTHWESTERLY MID-LEVEL FLOW IS AT LEAST MODEST IN

STRENGTH /30-40 KT AROUND 500 MB/....AHEAD OF A SIGNIFICANT SHORT

WAVE TROUGH GRADUALLY PIVOTING THROUGH THE OHIO VALLEY. AS THIS

IMPULSE APPROACHES THE CENTRAL APPALACHIANS LATER THIS

EVENING...MODELS SUGGEST THAT IT WILL TAKE ON AN INCREASINGLY

NEUTRAL TO NEGATIVE TILT. FORCING ASSOCIATED WITH THIS

FEATURE...COUPLED WITH SEASONABLY STRONG DEEP LAYER SHEAR... WILL

CONTINUE TO PROVIDE AT LEAST SOME POTENTIAL FOR STRONG/SEVERE STORM

DEVELOPMENT...INCLUDING ISOLATED SUPERCELLS.

GIVEN THE MOIST NATURE OF THE BOUNDARY LAYER...AND PERHAPS SOME

DRYING IN MID-LEVELS...HEAVY PRECIPITATION LOADING AND EVAPORATIVE

COOLING NEAR DOWNDRAFTS MAY CONTRIBUTE TO THE RISK FOR STRONG

SURFACE GUSTS.

..KERR/WEISS.. 06/27/2015

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