863 
ACUS11 KWNS 080657
SWOMCD
SPC MCD 080657 
OKZ000-TXZ000-080900-

MESOSCALE DISCUSSION 0839
NWS STORM PREDICTION CENTER NORMAN OK
0157 AM CDT THU MAY 08 2003

AREAS AFFECTED...SRN OK...PORTIONS N-CENTRAL TX

CONCERNING...TORNADO WATCH 293...

VALID 080657Z - 080900Z

PAIR OF POTENTIALLY TORNADIC SUPERCELLS CONTINUES MOVING EWD ACROSS
S-CENTRAL OK...EXPECTED TO MOVE ACROSS PORTIONS GARVIN/MURRAY/CARTER
COUNTIES THEN HEADED FOR PORTIONS
PONTOTOC/JOHNSTON/MARSHALL/BRYAN/COAL COUNTIES NEXT FEW HOURS.
ADDITIONAL WW MAY BE REQUIRED ACROSS PORTIONS S-CENTRAL/SERN OK NEAR
EXPIRATION TIME OF WW 293 IF CONVECTIVE TRENDS WARRANT.

BECAUSE OF THEIR SIZE...PROFUSE PRECIP PRODUCTION AND CLOSE
PROXIMITY -- 20-25 NM SEPARATION BETWEEN CIRCULATIONS -- NRN STORM
MAY INGEST OUTFLOW OR PRECIP FROM SRN STORM AND WEAKEN...HOWEVER IN
INTERIM WILL MAINTAIN THREAT OF DESTRUCTIVE HAIL AND TORNADOES.

MUCAPE 2500-4000 J/KG INDICATED IN MODIFIED RUC SOUNDINGS OVER
AREA...ALONG WITH 0-3 KM SRH 300-500 J/KG RANGE.  LATTER IS CLOSELY
CORROBORATED BY OBSERVED FWD VWP HODOGRAPH...WHICH SHOWS 50-60 KT
LLJ IMPINGING UPON THIS ACTIVITY.  ALTHOUGH LOW LEVEL AIR MASS
REMAINS VERY MOIST AND SUPPORTIVE OF SEVERE TSTMS...AND DRYLINE
REMAINS W OF REGION...INCREASING CINH OVERNIGHT ACROSS AREA SUGGESTS
PROBABILITIES FOR ADDITIONAL DEVELOPMENT ARE DIMINISHING FROM SW-NE.
 ACCORDINGLY...WW MAY BE CLEARED FROM SW-NE OR W-E AS TRENDS
INDICATE LITTLE POTENTIAL FOR STORM GENESIS.

..EDWARDS.. 05/08/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...OUN...

34549998 35379995 34669602 33239604 33419708