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8/1/11 Severe Thread


phlwx

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Wind is the biggest threat...not so sure about hail but isolated larger hail can't be ruled out since lapse is pretty steep. Killer will be west winds drying out the lower atmosphere.

IMO, my guess is scattered/broken line or lines...probably more storms north than city/south and probably a better threat in the Poconos than locally. JMO.

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New Day 1 puts the whole area in the slight now.

...NORTHEAST/MID ATLANTIC THIS AFTN AND EARLY EVE...

RESIDUAL EML PLUME BEING DRAWN ESEWD AHEAD OF AMPLIFYING ERN

CANADIAN TROUGH...IN CONJUNCTION WITH SFC HEATING...SUFFICIENTLY

MOIST LOW LVL ENVIRONMENT...AND 30-40 KT NNWLY DEEP SHEAR WILL

SUPPORT WDLY SCTD TO SCTD STORMS POSING A THREAT FOR HAIL AND

LOCALLY DMGG WIND. SOME OF THE STORMS BRIEFLY MAY ASSUME SUPERCELL

CHARACTERISTICS. WHILE WEAK LOW LVL CONVERGENCE SHOULD LIMIT STORM

COVERAGE...PRESENCE OF SUBSTANTIAL DEEP DIRECTIONAL SHEAR WITH

RELATIVELY STEEP LOW TO MID LVL LAPSE RATES SUGGEST THAT SVR

POTENTIAL WILL BE SUFFICIENTLY GREAT TO WARRANT EXTENSION OF SLIGHT

RISK AREA WWD INTO OH AND SWD INTO MD/DE. THE STORMS MAY EVOLVE

INTO SEVERAL SMALL CLUSTERS/BROKEN BANDS AS THEY MOVE/DEVELOP

SEWD...WITH A DIMINISHING THREAT FOR ISOLD SVR WIND AND POSSIBLY

HAIL CONTINUING INTO THIS EVE OVER THE MID ATLANTIC REGION AND PARTS

OF NEW ENGLAND.

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Lee...that would be nice if it actually happens. I have seen that same picture all too often this summer to have nothing even come close to materializing like it. I just want some rain..... 0.50"+ would be nice

cref_t3sfc_f10.png

This should be nice for the New Castle County Crew on this message board.

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mcd1820.gif

MESOSCALE DISCUSSION 1820

NWS STORM PREDICTION CENTER NORMAN OK

0222 PM CDT MON AUG 01 2011

AREAS AFFECTED...SRN/SERN PA...CNTRL/SRN NJ...DE...MD...NRN VA...ERN

WV

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 011922Z - 012045Z

DURING THE REMAINDER OF THE AFTERNOON...CLUSTERS OF STORMS ARE

FORECAST TO MOVE S/SE ACROSS SRN/SERN PA...CNTRL/SRN

NJ...DE...MD...NRN VA AND ERN WV. LARGE HAIL AND DAMAGING WINDS WILL

BE POSSIBLE WITH THIS ACTIVITY. AREA IS BEING MONITORED FOR A

POSSIBLE WW.

STORM CLUSTERS CONTINUE TO DEVELOP FROM OH E ACROSS PA/SERN NY

WITHIN A PLUME OF LARGE-SCALE ASCENT SPREADING SEWD WITH UPPER

TROUGH MOVING ACROSS QUEBEC/ONTARIO AND LWR GREAT LAKES REGION.

LATEST 16Z HRRR INDICATES THIS ACTIVITY WILL BE MAINTAINED THROUGH

THE REMAINDER OF THE AFTERNOON INTO THE EVENING AS IT SPREADS SEWD

THROUGH THE MID ATLANTIC REGION/DELMARVA. MEANWHILE...19Z SURFACE

OBSERVATIONS SHOW TEMPERATURES ARE IN THE 90S WITH DEWPOINTS IN THE

LOW TO MID 60S...AIDING IN THE DEVELOPMENT OF A MODERATELY UNSTABLE

AIRMASS. IN ADDITION...OBJECTIVE ANALYSIS GUIDANCE AND RUC FORECAST

SOUNDINGS INDICATE THE PRESENCE OF STEEP LOW-LEVEL LAPSE RATES AND

LARGE BOUNDARY LAYER TEMPERATURE/DEWPOINT SPREADS...FAVORABLE FOR

STRONG/SVR WIND GUSTS...IN ADDITION TO LARGE HAIL. THOUGH VERTICAL

WIND SHEAR IS NOT PARTICULARLY STRONG /I.E. EFFECTIVE BULK SHEAR

VALUES AOB 25 KT/...SVR WEATHER COVERAGE MAY BECOME WIDESPREAD

ENOUGH TO SUPPORT WW ISSUANCE. AREA WILL CONTINUE TO BE MONITORED.

..GARNER.. 08/01/2011

ATTN...WFO...PHI...BGM...AKQ...CTP...LWX...PBZ...RLX...

LAT...LON 40907716 40907507 40307398 38107592 37907833 38577950

40087917 40907716

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mcd1820.gif

MESOSCALE DISCUSSION 1820

NWS STORM PREDICTION CENTER NORMAN OK

0222 PM CDT MON AUG 01 2011

AREAS AFFECTED...SRN/SERN PA...CNTRL/SRN NJ...DE...MD...NRN VA...ERN

WV

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 011922Z - 012045Z

DURING THE REMAINDER OF THE AFTERNOON...CLUSTERS OF STORMS ARE

FORECAST TO MOVE S/SE ACROSS SRN/SERN PA...CNTRL/SRN

NJ...DE...MD...NRN VA AND ERN WV. LARGE HAIL AND DAMAGING WINDS WILL

BE POSSIBLE WITH THIS ACTIVITY. AREA IS BEING MONITORED FOR A

POSSIBLE WW.

STORM CLUSTERS CONTINUE TO DEVELOP FROM OH E ACROSS PA/SERN NY

WITHIN A PLUME OF LARGE-SCALE ASCENT SPREADING SEWD WITH UPPER

TROUGH MOVING ACROSS QUEBEC/ONTARIO AND LWR GREAT LAKES REGION.

LATEST 16Z HRRR INDICATES THIS ACTIVITY WILL BE MAINTAINED THROUGH

THE REMAINDER OF THE AFTERNOON INTO THE EVENING AS IT SPREADS SEWD

THROUGH THE MID ATLANTIC REGION/DELMARVA. MEANWHILE...19Z SURFACE

OBSERVATIONS SHOW TEMPERATURES ARE IN THE 90S WITH DEWPOINTS IN THE

LOW TO MID 60S...AIDING IN THE DEVELOPMENT OF A MODERATELY UNSTABLE

AIRMASS. IN ADDITION...OBJECTIVE ANALYSIS GUIDANCE AND RUC FORECAST

SOUNDINGS INDICATE THE PRESENCE OF STEEP LOW-LEVEL LAPSE RATES AND

LARGE BOUNDARY LAYER TEMPERATURE/DEWPOINT SPREADS...FAVORABLE FOR

STRONG/SVR WIND GUSTS...IN ADDITION TO LARGE HAIL. THOUGH VERTICAL

WIND SHEAR IS NOT PARTICULARLY STRONG /I.E. EFFECTIVE BULK SHEAR

VALUES AOB 25 KT/...SVR WEATHER COVERAGE MAY BECOME WIDESPREAD

ENOUGH TO SUPPORT WW ISSUANCE. AREA WILL CONTINUE TO BE MONITORED.

..GARNER.. 08/01/2011

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Nice. This should be interesting.

I'm sitting underneath round 1 of a couple (I think)...this cell has just rained on me for about 20 minutes...thundering a good bit but little/no wind. Not complaining one bit...just want the rain!

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I'm sitting underneath round 1 of a couple (I think)...this cell has just rained on me for about 20 minutes...thundering a good bit but little/no wind. Not complaining one bit...just want the rain!

I'll take the rain but no wind please, we lost 5-6 trees at the golf course and lots of debris came down from friday's storm. Will still be cleaning up well into mid-week.

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Had winds gusts to around approximately 40 MPH and hail that measured between 0.25-0.50 inches in King of Prussia at 5:25 PM.

Wow. My wife works just west of Rt 422 and said it was pouring with a little hail mixed in. Totally different story a few miles east of 422 with plenty of thunder/lightning here, but just light rain.

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Well, all heck broke loose over here in Voorhees, NJ at about 5:20 today. I'm down here at the shore and got a call from home.. Large hail up to golf ball size hail.. The hail was coming down for at least 5 minutes. No damaging winds reported.. Power is out at this hour.

Radar was showing VIL getting up to 80 and still is at this hour.

Just an active day today in the immediate Philadelphia area..

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