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2013 Mt. Holly CWA Convection Thread


SouthernNJ

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I really thought that line that was in York and Lancaster counties was going to make it to Delco in full strength, did these outrun the best forcing or did some sort of shear blow off the tops I know we did have a lot of the parameters to support the cells moving towards our section.

Your first mistake was thinking that line from York was going to make it.

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  • 2 weeks later...

Would be interested to see a plot of legit severe weather reports from the jun-August timeframe from the mt.holly warning area.. Anyone?

:lmao: - total LOL svr wx season for Bucks, can go back to 1996 on the ncdc link but hard to imagine a more abysmal season for Bucks County

 

note - added MAY to the equation since it's historically a good severe weather month

 

http://www.ncdc.noaa.gov/stormevents/

 

post-1715-0-33416700-1380302333_thumb.jp

 

 

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  • 2 weeks later...

mcd1950.gif


MESOSCALE DISCUSSION 1950

NWS STORM PREDICTION CENTER NORMAN OK

0710 AM CDT MON OCT 07 2013

AREAS AFFECTED...ERN VIRGINIA...CNTRL AND ERN MARYLAND...ERN

PENNSYLVANIA...SRN NEW YORK STATE

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 071210Z - 071415Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...SEVERE THUNDERSTORM POTENTIAL MAY INCREASE SUFFICIENTLY TO

REQUIRE ONE OR MORE WATCHES...PERHAPS AS EARLY AS THE 13-14Z TIME

FRAME.

DISCUSSION...A NARROW ENHANCED CONVECTIVE BAND APPEARS TO GRADUALLY

BE IN THE PROCESS OF EVOLVING ALONG A SIGNIFICANT SURFACE FRONT NOW

CROSSING THE LOWER GREAT LAKES/UPPER OHIO VALLEY AND CENTRAL

APPALACHIANS REGION. FURTHER DEVELOPMENT AND INTENSIFICATION

APPEARS LIKELY WHILE ACTIVITY SLOWLY PROGRESSES EASTWARD THROUGH THE

REMAINDER OF THE MORNING...AS FRONTOGENETIC FORCING CONTINUES TO

STRENGTHEN WITH THE APPROACH OF THE VIGOROUS UPSTREAM SHORT WAVE

TROUGH. THIS IS ALSO EXPECTED TO COINCIDE WITH SUBSTANTIVE

STRENGTHENING OF SOUTHERLY PRE-FRONTAL LOW-LEVEL FLOW...WITH THE

HIGH RESOLUTION RAPID REFRESH INDICATING 850 MB WINDS IN EXCESS OF

50 KT IN A CORRIDOR ACROSS NORTH CENTRAL VIRGINIA THROUGH

CENTRAL/EASTERN PENNSYLVANIA AND THE SOUTHERN TIER OF NEW YORK STATE

BY THE 15-17Z TIME FRAME.

INSTABILITY APPEARS THE PRIMARY LIMITING FACTOR CONCERNING THE

SEVERE WEATHER POTENTIAL. WITH CONSIDERABLE CLOUD COVER LIKELY TO

INHIBIT SURFACE HEATING...AND COLDER AIR ALOFT CONTINUING TO LAG THE

SURFACE FRONT...LOWER/MID TROPOSPHERIC LAPSE RATES WILL REMAIN WEAK.

BUT MOISTURE CONTENT IS SEASONABLY HIGH...AND CONTRIBUTING TO

SUFFICIENT CAPE THROUGH FAVORABLY COLD MID-LAYERS TO SUPPORT ONGOING

THUNDERSTORM ACTIVITY ALONG AND TO THE LEE OF THE BLUE RIDGE

MOUNTAINS. THIS LIKELY WILL CONTINUE DEVELOPING NORTHWARD WHILE

GRADUALLY SHIFTING EASTWARD DURING THE NEXT FEW HOURS. IT MAY NOT

TAKE MUCH CONVECTIVE INTENSIFICATION TO SUPPORT TO SUPPORT AT LEAST

LOW PROBABILITIES FOR SEVERE WIND GUSTS ASSOCIATED WITH DOWNWARD

MOMENTUM TRANSFER. AS PRECIPITATION LOADING INCREASES...THE

POTENTIAL FOR SEVERE WIND GUSTS PROBABLY WILL INCREASE THROUGH MID

TO LATE MORNING.

GIVEN THE HIGH BOUNDARY LAYER MOISTURE CONTENT...AND THE ANTICIPATED

EVOLUTION OF RATHER LARGE CLOCKWISE CURVED LOW-LEVEL HODOGRAPHS IN

THE PRE-FRONTAL ENVIRONMENT...THE RISK FOR TORNADOES MAY NOT BE

COMPLETELY NEGLIGIBLE. HOWEVER...THIS THREAT SEEMS LIMITED BY THE

LOW POTENTIAL FOR VIGOROUS DISCRETE STORM DEVELOPMENT.

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