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Mt. Holly Severe Threats


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This day is starting up fast already a meso out saying a watch is coming.

http://www.spc.noaa..../md/md1489.html

Excellent: http://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=16#

Count me as sceptical about Friday. Having an MCS persist into the afternoon as depicted would be pretty unusual for this corner of the world.

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mcd1489.gif

MESOSCALE DISCUSSION 1489

NWS STORM PREDICTION CENTER NORMAN OK

0925 AM CDT WED JUL 18 2012

AREAS AFFECTED...MUCH OF PA/NJ TO SOUTHERN NY/SOUTHERN NEW ENGLAND

CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY

VALID 181425Z - 181630Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...WITH INCREASING POTENTIAL FOR DAMAGING WINDS/SEVERE HAIL

THIS AFTERNOON...A SEVERE TSTM WATCH WILL LIKELY BE NEEDED FOR ALL

OR MUCH OF PA/NJ AND SOUTHERN PORTIONS OF NY/NEW ENGLAND BY 15Z-16Z.

DISCUSSION...A FRONTAL BOUNDARY IS ANALYZED THIS MORNING FROM LAKE

ERIE VICINITY EAST-NORTHEASTWARD TO EAST-CENTRAL NY/CENTRAL NEW

ENGLAND. THE AIRMASS TO THE SOUTH OF THIS BOUNDARY IS STEADILY

WARMING AMID RELATIVELY CLOUD-FREE SKIES PER VISIBLE SATELLITE

IMAGERY...WITH DEWPOINTS GENERALLY IN THE UPPER 60S/LOWER 70S F.

INCIPIENT TSTM DEVELOPMENT IS ALREADY OCCURRING ACROSS WEST-CENTRAL

PA AS OF 14Z. ALONG/SOUTH OF THE COLD FRONT...WITH ADDITIONAL AIDE

OF NEAR-COASTAL/PRE-FRONTAL SURFACE TROUGH DEVELOPMENT...IT SEEMS

VERY LIKELY THAT SCATTERED TSTMS WILL CONTINUE TO DEVELOP/INCREASE

INTO EARLY/MID AFTERNOON ACROSS MUCH OF THE REST OF PA/NJ AND

SOUTHERN NY/SOUTHERN NEW ENGLAND.

BASED ON 12Z OBSERVED SOUNDINGS SUCH AS BUF/ALB/OKX...MUCH OF THE

REGION RESIDES ON THE SOUTHERN FRINGE OF MODERATE WESTERLIES ALOFT

/30-50 KT 3-6 KM/ AND COINCIDES WITH A PLUME OF RELATIVELY STEEP MID

LEVEL LAPSE RATES /ESPECIALLY SOUTHEAST NY AND SOUTHERN NEW

ENGLAND/. WITH STEEPENING LOW LEVEL LAPSE RATES AND A LIKELIHOOD OF

2000-3500 J/KG SBCAPE SOUTH OF THE COLD FRONT...STRONG/SEVERE TSTM

DEVELOPMENT AND INTENSIFICATION IS LIKELY THROUGH EARLY/MID

AFTERNOON. SUFFICIENT VERTICAL SHEAR EXISTS FOR ORGANIZED/SUSTAINED

MULTICELLS...AND THIS WILL ESPECIALLY BE THE CASE FOR AREAS SUCH AS

NORTHEAST PA/NORTHERN NJ INTO FAR SOUTHEAST NY/SOUTHERN NEW ENGLAND.

HERE...SOMEWHAT STRONGER VERTICAL SHEAR WILL SUPPORT BOWING

STRUCTURES/SOME SUPERCELLS...WITH DAMAGING WINDS/SEVERE HAIL AND

PERHAPS A TORNADO BEING POSSIBLE.

..GUYER/MEAD.. 07/18/2012

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Watch just issued for NYC and SNE. The probs aren't out yet, but my guess is the WFOs couldn't agree on a consensus of probs (with north wanting higher and south wanting lower) so they decided to split it into two WWs. Ours should be out soon too.

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Just got the txt. Watch issued SE PA

cfac7332-e84d-e0d8.jpg

SEL1

0-

URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 491

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM EDT WED JUL 18 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

DISTRICT OF COLUMBIA

DELAWARE

MARYLAND

NEW JERSEY

SOUTHEAST NEW YORK

CENTRAL AND EASTERN PENNSYLVANIA

NORTHERN VIRGINIA

EASTERN WEST VIRGINIA PANHANDLE

COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

900 PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES EAST OF

STAUNTON VIRGINIA TO 25 MILES EAST NORTHEAST OF WILKESBARRE

PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 490...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON AHEAD OF COLD FRONT AND LEE TROUGH.

AMBIENT WARM SECTOR IS HOT AND HUMID WITH MLCAPE VALUES OF

2000-3000+ J/KG. WHEN COUPLED WITH STEEPENING LOW-LEVEL LAPSE RATES

AND HIGH PW VALUES...SETUP WILL FAVOR THE DEVELOPMENT OF INTENSE WET

MICROBURSTS CAPABLE OF DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 31020.

...MEAD

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With no shear, it's hard to see a sustained squall line/derecho forming, but the front ends of wet microbursts are going to be for real, y'all

After seeing what happened 3 weeks ago, I'm fine with not getting a derecho...a strong thunderstorm is okay with me on a day like this.

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This is my concern watching the radar to our west that they hit the metro area in earnest at drive time...

Yeah i have multiple family members that could be on the road at the time they look to roll through so If i can tell them to delay a bit I want to.

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