MESOSCALE DISCUSSION 0758

NWS STORM PREDICTION CENTER NORMAN OK

0837 AM CDT FRI MAY 08 2009

AREAS AFFECTED...SERN MO...CNTRL AND NERN AR..WRN TN...NRN MS...NRN AL AND SWRN KY

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 081337Z - 081430Z

DAMAGING BOW ECHO EXPECTED TO CONTINUE ESEWD INTO THE TN VALLEY REGION. WW WILL BE ISSUED SOON DOWNSTREAM FROM WW 266. WELL ORGANIZED DAMAGING COMMA HEAD/BOW ECHO SYSTEM WITH A HISTORY OF PRODUCING GUSTS UP TO 80 KT EXTENDS FROM SWRN MO...NWRN AR INTO NERN OK AND IS MOVING ESEWD AT AROUND 60 KT. AS BOUNDARY LAYER CONTINUES TO DESTABILIZE...THIS ACTIVITY IS EXPECTED TO DEVELOP ESEWD THROUGH AXIS OF MODERATE INSTABILITY ALONG NERN EDGE OF STRONGER CAP. DAMAGING WIND AND LARGE HAIL ARE EXPECTED TO REMAIN THE PRIMARY THREATS. HOWEVER...ISOLATED TORNADOES CANNOT BE RULED OUT...ESPECIALLY ALONG NRN AND SRN ENDS OF THE LINE.

..DIAL.. 05/08/2009