SWOMCD
SPC MCD 202220
PAZ000-NYZ000-WVZ000-OHZ000-202315-
MESOSCALE DISCUSSION 1940
NWS STORM PREDICTION CENTER NORMAN OK
0520 PM CDT THU AUG 20 2009
AREAS AFFECTED...MUCH OF ERN OH / NWRN WV / WRN PA / WRN NY
CONCERNING...SEVERE THUNDERSTORM WATCH 721...
VALID 202220Z - 202315Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 721
CONTINUES.
STRONG TO SEVERE STORMS WILL CONTINUE TO POSE A LARGE HAIL/DMGG WIND
THREAT ACROSS THE DISCUSSION AREA FOR THE NEXT SEVERAL HOURS. A
LOCALIZED TORNADO THREAT APPEARS POSSIBLE IN THE NEAR TERM ACROSS
PORTIONS OF EXTREME SERN OH AND PERHAPS FAR NWRN WV.
RECENT RADAR MOSAIC SHOWS A STRONG/SEVERE TSTM BAND ELONGATED FROM
PORTIONS OF SWRN ONTARIO INTO NERN OH WITH A BROKEN CLUSTER OF
STORMS MOVING NEWD OVER SERN OH AT 30 KTS. AHEAD OF THE SERN OH
CLUSTER...RELATIVELY BACKED LOW LEVEL FLOW EVIDENT AT PKB THE PAST
FEW HOURS SUGGESTS LOCALIZED ENHANCED LOW LEVEL SHEAR EXISTS
IMMEDIATELY AHEAD OF THE ONGOING CONVECTION. SINGLE SITE RADAR
IMAGERY SHOWS A SUPERCELL WITH PERSISTENT LOW LEVEL ROTATION
STRADDLING THE WASHINGTON/MORGAN COUNTY LINE. WITH AN UNDISTURBED
MOIST/UNSTABLE AIRMASS IN PLACE...IT SEEMS PLAUSIBLE THIS SUPERCELL
WILL CONTINUE TO TRACK ENEWD FOR THE NEXT HOUR OR SO PERHAPS POSING
AN ISOLD TORNADO RISK. FURTHER N...STORMS HAVE DEVELOPED ACROSS
NWRN PA ON THE ERN EXTENT OF THE ONGOING WW WITH RECENT MEASURED
GUSTS UP TO 42 KTS IN THE CLEVELAND METRO WITH ORGANIZING QLCS.
CONVECTIVE TRENDS WILL NEED TO BE MONITORED FOR A POSSIBLE LOCALIZED
WW EXTENSION-IN-AREA OR A NEW WW ISSUANCE IF TSTM INTENSITY IS
MAINTAINED AS NERN OH TSTM BAND ENCROACHES UPON THE PA BORDER.
..SMITH.. 08/20/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BUF...CTP...PBZ...RLX...CLE...
LAT...LON 38938251 39738192 40678198 42218102 42657923 42247853
41157848 40357888 39667981 39178083 38898170 38938251
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