CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 152122Z - 152245Z
ADDITIONAL WWS ARE LIKELY TO BE ISSUED SHORTLY EAST OF ONGOING
CONVECTIVE LINE ACROSS THE MISSISSIPPI VALLEY.
SQUALL LINE EXTENDING FROM THE MISSOURI OZARKS INTO THE ARKLATEX IS
STILL FLUCTUATING IN STRENGTH...AND INSTABILITY AHEAD OF IT DOES NOT
APPEAR PARTICULARLY STRONG. HOWEVER...IT DOES APPEAR TO BE
SUPPORTED BY SUBSTANTIVE MID/UPPER FORCING FOR UPWARD VERTICAL
MOTION...DOWNSTREAM OF THE LARGE-SCALE TROUGH SLOWLY SHIFTING INTO
THE PLAINS. EMBEDDED WITHIN 50-60+ KT SOUTHWESTERLY DEEP LAYER MEAN
FLOW...POTENTIAL FOR DAMAGING WIND GUSTS...PERHAPS LOCALLY ENHANCED
BY EMBEDDED MESOCYCLONES/ISOLATED TORNADOES... STILL APPEARS LIKELY
TO INCREASE LATE THIS AFTERNOON AND EVENING. A STRENGTHENING
SOUTHERLY 850 MB JET CORE MAY ACCOMPANY THE LINE...AND CONTRIBUTE TO
NORTHEASTWARD ACCELERATION OF THE LINE ACROSS PARTS OF EAST CENTRAL
AND SOUTHEAST MISSOURI INTO CENTRAL AND SOUTHERN ILLINOIS BETWEEN
NOW AND 00-02Z.
..KERR.. 04/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...LOT...ILX...MEG...JAN...LSX...DVN...LZK...
SGF...SHV...
LAT...LON 38839170 40339090 40878984 40768866 39738836 38578878
36648991 34219082 33329174 33059237 33369334 34389279
35779210 37109194 38219169 38839170
