A quick eyeball of "Olga remnants" using a shear scene type readily yields about a T1.5 tonight. Deep convection is blowing back up, fanned by those upper-level winds, making for a very interesting quasi-tropical/winter severe, mix.

SPC has just issued a new Tornado Watch #739 until 6AM.

Related Meso

DISCUSSION...RAPID DEEPENING SURFACE AND ALOFT OF SYSTEM MOVING
ACROSS TN/OH VALLEYS OVERNIGHT WITH VERY STRONG WIND FIELDS ROTATING
ACROSS SERN STATES. WITH UNSEASONABLY MOIST AIR MASS STREAMING NEWD
FROM ERN GULF AHEAD OF REMNANTS OF T.S. OLGA CONDITIONS WILL BECOME
INCREASINGLY FAVORABLE FOR SEVERE THUNDERSTORMS INCLUDING TORNADIC
SUPERCELLS OVERNIGHT AHEAD OF ONGOING SQUALL LINE. CURRENTLY PRIMARY
SEVERE POTENTIAL ASSOCIATED WITH MESO LOW MOVING ENEWD ALONG WARM
FRONT SRN GA INTO SRN SC. SEVERE THREAT WILL INCREASE SWD INTO
NRN/CENTRAL FL AS SHEAR AND MOISTURE BECOME VERY FAVORABLE FOR
ROTATING STORMS ALONG AND AHEAD OF SQUALL LINE THAT CURRENTLY
EXTENDS SSWWD INTO NERN GULF.
http://www.spc.noaa.gov/products/md/md2229.html