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www.spc.noaa.gov...
...THERE IS A MDT RISK OF SVR TSTMS ACROSS MUCH OF MS...NRN AL...TN...NERN LA...
...THERE IS A SLGT RISK OF SVR TSTMS FROM IA AND IL SWD ACROSS THE OH...TN...THE MID/LOWER MS VALLEY EWD TO THE WRN CAROLINAS...
...SUMMARY...
WIDESPREAD SEVERE STORMS INCLUDING STRONG TORNADOES...DAMAGING WINDS AND VERY LARGE HAIL APPEAR LIKELY MONDAY AND MONDAY NIGHT ACROSS MUCH OF MISSISSIPPI...NORTHERN ALABAMA...TENNESSEE...SOUTHERN KENTUCKY...AND NORTHEASTERN LOUISIANA.
...SYNOPSIS...
LOW-PRESSURE WILL BECOME VERTICALLY STACKED OVER ERN NEB AND IA DURING THE DAY WITH LEADING JET MAX DEVELOPING NEWD FROM THE ARKLATEX INTO THE LOWER OH VALLEY. AN OCCLUDED FRONT WILL EXTEND EWD FROM THE LOW ACROSS IA AND NRN IL...WITH WARM FRONT LIFTING NWD ACROSS INDIANA AND OHIO. A COLD FRONT WILL EXTEND SWD FROM THE LOW...ARCING RAPIDLY NEWD ACROSS THE MID MO RIVER VALLEY DURING THE DAY AND BECOMING STATIONARY ACROSS THE LOWER MS RIVER VALLEY BY LATE AFTERNOON. AN UNSTABLE AND MOIST ENVIRONMENT WILL EXIST AHEAD OF THE COLD FRONT WITH SHEAR PROFILES FAVORABLE FOR SEVERE THUNDERSTORMS ACROSS A LARGE AREA FROM IA TO THE CNTRL GULF COAST.
TO THE E...A FRONT WILL GRADUALLY RETREAT NWD ACROSS NC...ALLOWING FOR DESTABILIZATION AND A THREAT OF ISOLATED SEVERE STORMS THERE.
...LOWER MS VALLEY EWD INTO NRN AL AND MIDDLE TN...
WHILE THE PREVIOUS DAYS CONVECTION WILL LIKELY PLAY A ROLE IN DELINEATING THE PRECISE THREAT CORRIDOR...A SW-NE ORIENTED ZONE OF TRAINING SEVERE THUNDERSTORMS IS LIKELY FROM NERN LA ACROSS MS AND INTO NRN AL AND MIDDLE TN. THE STORMS WILL EITHER BE TIED TO THE COLD FRONT...OR AN OUTFLOW BOUNDARY WHICH COULD SPREAD OUT AHEAD OF THE MAIN SLOW MOVING FRONT. REGARDLESS...A VERY MOIST AND UNSTABLE AIR MASS WILL RESIDE AHEAD OF THE COLD FRONT...WITH SHEAR PROFILES QUITE FAVORABLE FOR SUPERCELLS AND TORNADOES. A LONG UPDRAFT RESIDENCE TIME IN THE UNSTABLE AND HIGHLY SHEARED ENVIRONMENT...AS WELL AS RELATIVELY STEEP MIDLEVEL LAPSE RATES SUGGEST STRONG TORNADOES WILL BE POSSIBLE. VERY LARGE HAIL WILL ALSO OCCUR AS WELL AS POTENTIAL FLOODING. THE MOST SIGNIFICANT TORNADO THREAT IS EXPECTED ACROSS MS.
...CNTRL AND NRN IL...FAR ERN IA AND NWRN IND...
STRONG HEIGHT FALLS AND COOLING ALOFT WITH THE LEFT-EXIT REGION OF THE MIDLEVEL JET WILL OVERSPREAD THE WARM SECTOR...RESULTING IN RAPID DESTABILIZATION. WITH LITTLE CAPPING...A BROKEN ARC OF STORMS IS EXPECTED TO FORM BY EARLY AFTERNOON ALONG THE COLD FRONT. LARGE HAIL WILL BE LIKELY ALONG WITH A FEW TORNADOES.
...NRN SC INTO WRN AND CNTRL NC...
AN E-W ORIENTED BOUNDARY WILL GRADUALLY MOVE NWD ACROSS NC...WITH MID 60S DEWPOINTS TO THE S. DAYTIME HEATING WILL ALLOW FOR DESTABILIZATION WITH AROUND 1000-1500 MLCAPE DEVELOPING BY AFTERNOON. WHILE SHORTWAVE RIDGING WILL EXIST MUCH OF THE DAY...COOLING ALOFT AND INCREASING SHEAR PROFILES WILL SPREAD INTO FAR WRN NC AND SC LATE IN THE DAY...RESULTING IN A FAVORABLE SUPERCELL ENVIRONMENT. HAIL WILL BE A DISTINCT THREAT WITH THE STRONGER CORES...BUT A TORNADO OR TWO WILL BE POSSIBLE AS LOW-LEVEL SHEAR INCREASES LATE IN THE DAY.