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Mesoscale Discussion 330 |
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MESOSCALE DISCUSSION 0330
NWS STORM PREDICTION CENTER NORMAN OK
0453 PM CDT SUN MAR 29 2009
AREAS AFFECTED...EXTREME ERN PA...WRN NJ...NRN DE AND EXTREME NERN
MD
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 292153Z - 292330Z
SVR THREAT WILL EXIST ACROSS EXTREME ERN PA...NJ...NRN DE AND NERN
MD FOR A FEW MORE HOURS. DMGG WIND GUSTS AND LARGE HAIL ARE
LIKELY...BUT A TORNADO RISK CANNOT BE RULED OUT SOUTH OF A LINE FROM
KPTW-KDYL SWD TO INCLUDE ALL OF THE PHL METRO AREA.
BKN LINE OF TSTMS...INCLUDING SUPERCELLS...CONTINUES TO ORGANIZE
FROM AVOCA SWD TO BALTIMORE. INTENSE CELL THAT PRODUCED SVR WIND
GUSTS IN READING HAS MOVED N OF THE WRMFNT BUT WILL AFFECT KABE-KUKT
REGION NEWD INTO NRN NJ AND PERHAPS WRN LONG ISLAND WITH A LARGE
HAIL THREAT FOR A FEW MORE HOURS.
FARTHER S...THERE SEEMS TO BE AN INCREASING THREAT FOR SUPERCELLS
AND TORNADOES INVOF THE WRMFNT/SFC LOW ACROSS THE PHL METRO AREA
WHERE 2-HRLY PRESSURE FALLS WERE IN EXCESS OF 3 MB. HERE...STORMS
DEVELOPING OVER CHESTER COUNTY SWD INTO NERN MD WILL LIKELY MOVE ENE
WITHIN THE CAPE AXIS TOWARD PHL. THESE STORMS WILL HAVE
AVAILABILITY TO THE STRONGEST STORM RELATIVE HELICITY AND POTENTIAL
FOR TORNADOES AS THEY CROSS THE WRMFNT.
AFTER COORDINATION WITH THE MOUNT HOLLY OFFICE...A SVR WEATHER WATCH
WILL NOT BE ISSUED. HOWEVER...THERE WILL NEED TO BE A HEIGHTENED
AWARENESS FOR THE POTENTIAL FOR SVR WEATHER...INCLUDING TORNADOES IN
THE PHL METRO AREA FROM 2230-00Z. AT LEAST ISOLD LARGE HAIL/DMGG
WIND THREATS WILL EXTEND ENE INTO MUCH OF NJ THROUGH MID-EVENING.
..RACY.. 03/29/2009
ATTN...WFO...OKX...PHI...
LAT...LON 40477562 40877551 41057527 41097479 40577434 40277437
40037453 39827479 39697519 39607544 39577587 39717592
40477562
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