ultimo bollettino SPC:

VALID 241200Z - 011200Z

A VIGOROUS UPPER-LEVEL TROUGH AND CLOSED-OFF LOW WILL MOVE EWD INTO
THE PLAINS SATURDAY AND SWING NEWD ACROSS THE UPPER MS VALLEY
SATURDAY NIGHT INTO SUNDAY. DYNAMICS AND VERTICAL SHEAR WITH THIS
SYSTEM WILL BE VERY STRONG WHICH COUPLED WITH ADEQUATE LOW-LEVEL
MOISTURE SHOULD RESULT IN A WIDESPREAD SEVERE WEATHER EVENT SATURDAY
THROUGH SUNDAY FROM THE ERN PLAINS EWD TO THE TN/OH VALLEYS. A
SQUALL-LINE SHOULD BE ONGOING ACROSS THE PLAINS EARLY IN THE DAY 4
PERIOD AND THE LINE WILL LIKELY CONTAIN SUPERCELLS AND/OR BOW
ECHOES. OTHER SEVERE STORMS ARE POSSIBLE AHEAD OF THE LINE AND NEAR
THE UPPER-LOW CENTER ESPECIALLY AS SFC TEMPS WARM LATE SATURDAY
MORNING INTO THE AFTERNOON. ALTHOUGH THE SPECIFIC TIMING OF THE
UPPER-TROUGH AND AMOUNT OF MOISTURE RETURN STILL REMAIN
UNCERTAIN...CONFIDENCE IS INCREASING THAT A SIGNIFICANT SEVERE
WEATHER EPISODE WILL OCCUR ACROSS THE PLAINS AND MS VALLEY SATURDAY
AND SUNDAY.