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Spring/ Summer 2014 Convection Discussion


weatherwiz

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   MESOSCALE DISCUSSION 1254   NWS STORM PREDICTION CENTER NORMAN OK   1145 AM CDT WED JUL 02 2014   AREAS AFFECTED...SERN PA/NJ/SERN NY INCLUDING PARTS OF LONG   ISLAND/CT/RI/MA AND SRN NH   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY    VALID 021645Z - 021745Z   PROBABILITY OF WATCH ISSUANCE...95 PERCENT   SUMMARY...TSTMS ARE EXPECTED TO DEVELOP AND/OR MOVE INTO THE   MID-ATLANTIC TO THE NEW ENGLAND STATES THIS AFTERNOON...WITH STORMS   BECOMING STRONG TO SEVERE PRODUCING DAMAGING WINDS AND HAIL.  WW   ISSUANCE IS LIKELY FROM PARTS OF NEW ENGLAND SWD TO NJ...SERN PA AND   PERHAPS PORTIONS OF THE DELMARVA.   DISCUSSION...STRONG SURFACE HEATING HAS RESULTED IN TEMPERATURES   ALREADY AT ABOVE NORMAL READINGS AROUND NOON IN THE UPPER 80S TO   LOWER 90S FROM SERN PA AND NJ NWD TO NH.  THIS HEATING OCCURRING   WITHIN THE PRESENCE OF A MOISTURE RICH ENVIRONMENT /PW VALUES OF 1.7   TO NEAR 2 INCHES/ HAS RESULTED IN MODERATE TO STRONG INSTABILITY   ACROSS MUCH OF THE MID-ATLANTIC REGION TO NEW ENGLAND.  EFFECTIVE   BULK SHEAR IS EXPECTED TO STRENGTHEN FROM WEST TO EAST AND BECOME   SUFFICIENT FOR MULTICELLS AND PERHAPS A FEW SUPERCELLS.  THESE   FACTORS WILL SUPPORT DAMAGING WINDS AND HAIL AS THE PRIMARY THREATS   THROUGH THE AFTERNOON TO EARLY EVENING.   ..PETERS/CORFIDI.. 07/02/2014
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Its on

 

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WWUS40 KWNS 021727WWP6SEVERE THUNDERSTORM WATCH PROBABILITIES FOR WS 0386NWS STORM PREDICTION CENTER NORMAN OK1221 PM CDT WED JUL 02 2014WS 0386PROBABILITY TABLE:PROB OF 2 OR MORE TORNADOES                        :  20%PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES         : <02%PROB OF 10 OR MORE SEVERE WIND EVENTS              :  70%PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS          :  10%PROB OF 10 OR MORE SEVERE HAIL EVENTS              :  40%PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES          : <05%PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : >95%&&ATTRIBUTE TABLE:MAX HAIL /INCHES/                            : 1.0MAX WIND GUSTS SURFACE /KNOTS/               : 60MAX TOPS /X 100 FEET/                        : 550MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 24030PARTICULARLY DANGEROUS SITUATION             : NO&&FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH ANDWATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU6.
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meh east of the ct river valley .. very little shear despite modest CAPE and ok mid-lvl lapse rates. factor in storm motion and the fact storms will approach the ct river valley by ~ 22z - 0z combined with loss of diurnal instability = meh

hudson valley / berkshires on the other hand look to rock with decent shear + closer to a forcing mechanism

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