SWOMCD
SPC MCD 310656
PAZ000-WVZ000-OHZ000-310830-
MESOSCALE DISCUSSION 1108
NWS STORM PREDICTION CENTER NORMAN OK
0156 AM CDT SAT MAY 31 2008
AREAS AFFECTED...PORTIONS OH...NERN PA...NRN PANHANDLE OF WV.
CONCERNING...TORNADO WATCH 398...
VALID 310656Z - 310830Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 398 CONTINUES.
SVR POTENTIAL IS EXPECTED TO SPREAD/SHIFT EWD ACROSS OH DURING
REMAINDER PRE-DAWN HOURS...PERHAPS REACHING PORTIONS WRN PA AND
ADJACENT PANHANDLE OF WV. ADDITIONAL WW MAY BE REQUIRED WITHIN AN
HOUR.
RUC FCST SOUNDINGS INDICATE GENERALLY INCREASING INSTABILITY AND
DECREASING CINH WITH SWD EXTENT ACROSS THIS REGION...MLCAPES RANGING
FROM LESS THAN 250 J/KG OVER NERN OH/NWRN PA TO 1000-1200 J/KG
S-CENTRAL/SERN OH WHERE LOW LEVEL MOISTURE IS GREATEST. RELATIVELY
RICH THETAE ESPECIALLY CENTRAL/SRN AND SERN OH HELPS TO OFFSET
RELATIVELY WEAK LAPSE RATES ALOFT AND SHOULD MAINTAIN PRESENCE OF
EFFECTIVE LIFTED PARCELS AT OR VERY NEAR SFC. 45-55 KT LLJ WILL
CONTINUE TO ELONGATE SLIGHTLY CURVED LOW LEVEL
HODOGRAPHS...RESULTING IN 200-300 J/KG 0-1 KM SRH FOR ANY
RIGHTWARD-DEVIANT/EWD-MOVING STORMS. DEEP-LAYER SHEAR PROFILES
SUPPORT POTENTIAL FOR ADDITIONAL MESOCYCLONIC SPINUPS AND ASSOCIATED
RISK OF TORNADOES WITHIN STRONGER CELLS...BOTH EMBEDDED WITHIN
BROADER PRECIP PLUME OVER CENTRAL/NRN OH AND WITH TRAILING TSTMS
MOVING ACROSS NRN PORTIONS WW 298.
..EDWARDS.. 05/31/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...ILN...IWX...
39178476 40578468 41188260 41708030 41168015 40058049
38788226
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