MESOSCALE DISCUSSION 0171
NWS STORM PREDICTION CENTER NORMAN OK
0939 PM CST TUE FEB 05 2008
AREAS AFFECTED…MIDDLE TENNESSEE
CONCERNING…TORNADO WATCH 40…
VALID 060339Z - 060515Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 40 CONTINUES.
AN ADDITIONAL WW PROBABLY WILL BE NEEDED SOUTH OF CURRENT WW SOON.
FORCING SUPPORTING ONGOING CLUSTER OF TORNADIC SUPERCELLS…NEAR/
NORTHWEST OF NASHVILLE…IS EXPECTED TO DEVELOP NORTHEAST OF MIDDLE
TENNESSEE BY 04-05Z. BUT…SEVERE THREAT WILL PERSIST UNTIL
UPSTREAM SQUALL LINE ADVANCES THROUGH THE INTERSTATE 65 CORRIDOR
DURING THE 06-08Z TIME FRAME. THE RISK FOR DAMAGING WINDS MAY BE
THE PRIMARY SEVERE THREAT WITH THE SQUALL LINE…BUT LOW-LEVEL SHEAR
WILL REMAIN VERY STRONG AND SUPPORTIVE OF CONTINUING TORNADO
POTENTIAL…AS THE BOUNDARY LAYER REMAINS RELATIVELY WARM/ MOIST AND
POTENTIALLY BUOYANT.
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