SWOMCD
SPC MCD 282037
OHZ000-MIZ000-INZ000-282200-
MESOSCALE DISCUSSION 1489
NWS STORM PREDICTION CENTER NORMAN OK
0337 PM CDT WED JUL 28 2010
AREAS AFFECTED...NRN INDIANA...NRN OH...EXTREME SERN LOWER MI...WRN
LAKE ERIE
CONCERNING...SEVERE THUNDERSTORM WATCH 545...
VALID 282037Z - 282200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 545
CONTINUES.
A LINE OF STRONG/SEVERE THUNDERSTORMS EXTENDS FROM EXTREME NRN PARTS
OF INDIANA AND NWRN OH TO THE NRN SHORE OF LAKE ERIE. RADAR SHOWS A
NUMBER OF EMBEDDED LEWPS/SMALL BOW ECHO SEGMENTS WHICH LIKELY
CONTAIN LOCALIZED DOWNBURST WINDS...AND THIS HAS BEEN SUBSTANTIATED
BY RECENT STORM REPORTS.
THE THUNDERSTORMS CONTINUE TO MOVE THROUGH A VERY WARM AND UNSTABLE
AIR MASS WITH MLCAPE RANGING FROM 1500 J/KG OVER NERN OH TO 2500
J/KG OVER NRN INDIANA. WESTERLY UNIDIRECTIONAL FLOW WITH 30-40 KT
MID-LEVEL WINDS WILL MAINTAIN A KINEMATIC ENVIRONMENT SUPPORTIVE OF
BOW ECHO STRUCTURES WITHIN THE THUNDERSTORM LINE. WITH TIME...THE
STORMS WILL GRADUALLY BE MOVING INTO A LESS FAVORABLE WIND
ENVIRONMENT NEAR THE SRN EDGE OF THE WW WHERE WEAKER WINDS ALOFT
EXIST...AND IT IS UNCLEAR IF A NEW WW WILL BE NEEDED SOUTH OF WW
545.
..WEISS.. 07/28/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CLE...DTX...IWX...LOT...
LAT...LON 41768688 42018417 42178304 41748249 41978182 42198112
42278060 41158052 40858382 40918694 41768688
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