ACUS3 KMKC 081741
SWOMCD
SPC MESOSCALE DISCUSSION
FOR CNTRL AND SRN AR..EXTRM SWRN TN AND NWRN MS
CONCERNING...SEVERE THUNDERSTORM POTENTIAL...
VERY WELL DEFINED MVC IS MOVG ESEWD ARCS MO WITH LEADING EDGE OF
ASSOC ACTVTY BDRY XTNDG FM NERN AR INTO E CNTRL OK. ACTVTY ALG
THIS BDRY IS INCRG OVR AR AS DIURNAL HEATING CONTS. SFC BASED LI
VALUES OF 3500 TO 4500 J/KG ARE CURRENTLY PRESENT OVER CNTRL AND
SRN AR AND NWRN MS. VAD WINDS AT SGF AND LIT INDICATE MVC HAS
DISTORTED WIND FIELDS LOCALLY SUCH THAT ORGANIZED SVR DVLPMT IS
PSBL WITH E/W BAND OF TSTMS AS IT MOVS SLOWLY SWD INTO VERY UNSTBL
AIR. PRINT DY1 OUTLOOK WILL BE UPGRADED TO SLGT RISK ON 19Z
OUTLOOK AND WE ARE MONITORING CONDITIONS CLOSELY FOR PSBL WW.
..JOHNS.. 07/08/97
WWUS9 KMKC 081759
SEL2
ARZ000-090000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 582
STORM PREDICTION CENTER NORMAN OK
1259 PM CDT TUE JUL 8 1997
THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
ARKANSAS
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 700
PM CDT.
HAIL TO 1 3/4 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH OF FORT SMITH
ARKANSAS TO 35 MILES SOUTHEAST OF JONESBORO ARKANSAS.
DISCUSSION...CONVECTION ASSOCIATED WITH MESOSCALE VORTICITY CENTER
(MVC) IS INCREASING OVER PORTIONS OF NW/N CENTRAL AR. AIR MASS S OF
ACTIVITY BOUNDARY IS VERY UNSTABLE WITH CAPES EXCEEDING 4000 J/KG.
LATEST PROFILER/VAD WIND DATA SHOWS ENHANCED FLOW ASSOCIATED WITH
MVC...SUGGESTING A THREAT FOR ORGANIZED STRONG/SEVERE
THUNDERSTORMS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 3/4 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 29025.
...VESCIO