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Mid-June severe threats


Ian

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   MESOSCALE DISCUSSION 1060   NWS STORM PREDICTION CENTER NORMAN OK   0128 PM CDT THU JUN 18 2015   AREAS AFFECTED...NERN KY...SRN OH...WV...NRN VA   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE    VALID 181828Z - 182030Z   PROBABILITY OF WATCH ISSUANCE...40 PERCENT   SUMMARY...STORMS SHOULD CONTINUE TO INCREASE IN COVERAGE AND   INTENSITY THIS AFTERNOON AS THEY TRAVEL EWD FROM SRN OH/NERN KY   ACROSS WV AND INTO NRN VA.   DISCUSSION...STRONG HEATING HAS LED TO AN ERUPTION OF CELLS OVER NRN   KY WHICH WILL SOON MOVE INTO SRN OH AND INTO WV. THIS IS OCCURRING   BENEATH MODEST WLY FLOW ALOFT...AND WITH RELATIVELY STEEP LOW TO   MIDLEVEL LAPSE RATES IN PLACE. OVERALL HODOGRAPHS LENGTH IS ONLY   MARGINALLY SUPPORTIVE OF LONG-LIVED CELLS...BUT THE FAVORABLE TIME   OF DAY AS WELL AS GENERALLY INCREASING FLOW WITH HEIGHT SUPPORT THE   IDEA OF A FEW CELLS CAPABLE OF HAIL AS WELL AS SMALL BOWING   STRUCTURES WITH WIND POTENTIAL.    IF OVERALL TRENDS CONTINUE UP...A WATCH MAY NEED TO BE CONSIDERED   FOR POINTS DOWNSTREAM OF THIS CONVECTION.   ..JEWELL/KERR.. 06/18/2015   ATTN...WFO...AKQ...LWX...RNK...PBZ...RLX...JKL...ILN...LMK...
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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
256 PM EDT THU JUN 18 2015

.NEAR TERM /TONIGHT/...

A WARM FRONT IS LOCATED ACROSS PA/NJ TO THE DELMAVA PENNISULA
WHILE A COLD FRONT MOVES SOUTH THROUGH THE OHIO VALLEY THIS
AFTERNOON. THIS PUTS THE MID-ATLANTIC IN THE WARM SECTOR IN A VERY
MOIST ENVIONMENT.

THE REGION IS UNSTABLE AT THIS TIME WITH 1-2K J/KG OF SBCAPE WITH
UPWARDS OF 3.5K J/KG IN CENTRAL VA NEAR THE PIEDMONT AND TIDEWATER.
EFFECTIVE SHEAR OF 35-45 KTS IS ALSO ACROSS THE REGION WITH PWATS
NEAR 1.7 INCHES. THIS LEADS TO A SET-UP FOR STRONG TO SEVERE STORMS
ACROSS THE REGION. HOWEVER...SYNOPTIC FORCING IS LIMITED WITH A SFC
TROUGH EAST OF THE BAY AT THIS TIME. STORMS HAVE FORMED ON THE
HIGHER TERRAIN ACROSS THE APPALACHAINS WITH ISO-SCT STORMS ACROSS
THE HIGHER TERRAIN INCLUDING THE BLUE RIDGE. THIS AREA IS PRIME FOR
UPDRAFTS TO MAINTAIN THEMSELVES AND MOVE EASTWARD INTO THE UNSTABLE
ENVIRONMENT. AT THIS TIME...THE REGION IS IN A SLGT RISK OF SEVERE
WEATHER WITH DMG WINDS AND LARGE HAIL BEING THE MAIN THREATS AT THIS
TIME. ANY STORMS THAT NEAR THE SFC TROUGH MAY INGEST LOW LEVEL
VORTICITY AND FOR THAT ISOLATED TORS AND WATERSPOUTS ARE
POSSIBLE...MAINLY NEAR S MD/PIEDMONT AND SURRONDING WATERS.


THE COLD FRONT WILL MOVE INTO THE APPALACHIAN REGION TONIGHT. A
MOIST ATMOSPHERE WILL CONTINUE ACROSS THE REGION AND SHOWERS AND
THUNDERSTORMS FROM THE NORTH AND WEST MAY ENTER THE REGION INTO THE
EVENING HOURS AFTER THE LOSS OF DAYTIME HEATING. AN APPROACHING
DISTURBANCE MAY ALSO INTIATE SOME STORMS MAINLY ACROSS WV. MODELS
ARE KEEPING QPF WEST OF APPALACHIANS BUT WITH WESTERLY FLOW ALOFT
AND DEWPTS STILL HIGH KEPT CHANCE OF SHOWERS THIS EVENING.

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Might get some hail out of the cell over the wash/fdk county line. VIL pushing 65

ETA:

tops too low still. Have to see if the cell intensifies.

General trend seems to be slow intensification. Quite slow in fact. Nothing on the explosive side today. 

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