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June 24-? severe weather discussion


Ian

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Pity Meso:

 

 

 

000 
ACUS11 KWNS 271705 
SWOMCD 
SPC MCD 271704 
NYZ000-NJZ000-PAZ000-DEZ000-MDZ000-DCZ000-VAZ000-WVZ000-271900- 

MESOSCALE DISCUSSION 1266 
NWS STORM PREDICTION CENTER NORMAN OK 
1204 PM CDT THU JUN 27 2013 

AREAS AFFECTED...UPPER MID-ATLANTIC...NORTHEAST 

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 271704Z - 271900Z 

PROBABILITY OF WATCH ISSUANCE...60 PERCENT 

SUMMARY...TSTM COVERAGE AND INTENSITY WILL INCREASE IN ASSOCIATION 
WITH AN MCV SHIFTING NEWD FROM NRN VA. STRENGTHENING DEEP-LAYER 
SHEAR ALONG WITH CONTINUED DOWNSTREAM DESTABILIZATION SHOULD BE 
SUFFICIENT FOR AT LEAST ISOLATED SEVERE TSTMS WITH A PRIMARY RISK OF 
DAMAGING WINDS AND SOME HAIL. 

DISCUSSION...16Z SURFACE ANALYSIS PLACED A 1006 MB CYCLONE NEAR THE 
MD PANHANDLE WITH AN MCV EVIDENT IN VISIBLE SATELLITE IMAGERY ACROSS 
NRN VA AHEAD OF THE BROADER MID-LEVEL TROUGH CROSSING THE CNTRL 
APPALACHIANS. SURFACE TEMPERATURES HAVE HEATED WELL INTO THE 80S 
DOWNSTREAM OF THE THICKER CLOUD DECKS ASSOCIATED WITH THE MCV AND 
ALONG THE APPALACHIANS. A NARROW BELT OF MODERATELY STRONG MID-LEVEL 
SWLYS /AROUND 30-35 KT/ WAS SAMPLED IN CCX/BGM VWP DATA AND THIS 
ENHANCEMENT SHOULD SHIFT EWD THROUGH THE AFTERNOON. 
MEANWHILE...STRONGER LOW-LEVEL FLOW SAMPLED IN AKQ VWP DATA SHOULD 
DEVELOP NEWD ALONG THE COASTAL PLAIN. SETUP MAY YIELD SEVERAL 
CLUSTERS WITH DAMAGING WINDS AND MARGINALLY SEVERE HAIL AS THE MAIN 
HAZARDS...WITH PERHAPS A BRIEF TORNADO OR TWO POSSIBLE WITH 
TRANSIENT SUPERCELL STRUCTURES NEAR THE ATLANTIC COAST. 

..GRAMS/KERR.. 06/27/2013 

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... 

ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX...
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Um... okay?

WW 377 TORNADO DC DE MD NJ PA VA CW 271800Z - 280200Z  AXIS..75 STATUTE MILES EAST AND WEST OF LINE..  40NW ABE/ALLENTOWN PA/ - 50S DOV/DOVER DE/  ..AVIATION COORDS.. 65NM E/W /32NNW ETX - 4NE SBY/  HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.  MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24025.  
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BULLETIN - IMMEDIATE BROADCAST REQUESTED
     TORNADO WATCH OUTLINE UPDATE FOR WT 377
     NWS STORM PREDICTION CENTER NORMAN OK
     200 PM EDT THU JUN 27 2013
    
     TORNADO WATCH 377 IS IN EFFECT UNTIL 1000 PM EDT FOR THE
      FOLLOWING LOCATIONS
    
     DCC001-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     DC
     .    DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
    
     DISTRICT OF COLUMBIA
    
    
     DEC001-003-005-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     DE
     .    DELAWARE COUNTIES INCLUDED ARE
    
     KENT                 NEW CASTLE          SUSSEX             
    
    
     MDC003-005-009-011-013-015-017-021-025-027-029-031-033-035-037-
     041-043-510-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     MD
     .    MARYLAND COUNTIES INCLUDED ARE
    
     ANNE ARUNDEL         BALTIMORE           CALVERT            
     CAROLINE             CARROLL             CECIL              
     CHARLES              FREDERICK           HARFORD            
     HOWARD               KENT                MONTGOMERY         
     PRINCE GEORGES       QUEEN ANNE'S        ST. MARYS          
     TALBOT               WASHINGTON         
    
    
     MARYLAND INDEPENDENT CITIES INCLUDED ARE
    
     BALTIMORE CITY      
    
    
     NJC001-005-007-009-011-015-019-021-023-025-027-029-033-035-037-
     041-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     NJ
     .    NEW JERSEY COUNTIES INCLUDED ARE
    
     ATLANTIC             BURLINGTON          CAMDEN             
     CAPE MAY             CUMBERLAND          GLOUCESTER         
     HUNTERDON            MERCER              MIDDLESEX          
     MONMOUTH             MORRIS              OCEAN              
     SALEM                SOMERSET            SUSSEX             
     WARREN              
    
    
     PAC001-011-017-025-029-037-041-043-045-055-057-061-067-071-075-
     077-087-089-091-093-095-097-099-101-107-109-119-133-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     PA
     .    PENNSYLVANIA COUNTIES INCLUDED ARE
    
     ADAMS                BERKS               BUCKS              
     CARBON               CHESTER             COLUMBIA           
     CUMBERLAND           DAUPHIN             DELAWARE           
     FRANKLIN             FULTON              HUNTINGDON         
     JUNIATA              LANCASTER           LEBANON            
     LEHIGH               MIFFLIN             MONROE             
     MONTGOMERY           MONTOUR             NORTHAMPTON        
     NORTHUMBERLAND       PERRY               PHILADELPHIA       
     SCHUYLKILL           SNYDER              UNION              
     YORK                
    
    
     VAC013-059-107-600-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     VA
     .    VIRGINIA COUNTIES INCLUDED ARE
    
     ARLINGTON            FAIRFAX             LOUDOUN            
    
    
     VIRGINIA INDEPENDENT CITIES INCLUDED ARE
    
     FAIRFAX             
    
    
     ANZ430-431-530-531-532-533-534-535-536-537-538-539-540-541-542-
     280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     CW
    
     .    ADJACENT COASTAL WATERS INCLUDED ARE
    
     DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE
    
     DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE
    
     CHESAPEAKE BAY NORTH OF POOLES ISLAND MD
    
     CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD
    
     CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
    
     CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
    
     CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
    
     TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
    
     TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
    
     TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
    
     PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
    
     CHESTER RIVER TO QUEENSTOWN MD
    
     EASTERN BAY
    
     CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
    
     PATUXENT RIVER TO BROOMES ISLAND MD
    
     ATTN...WFO...LWX...PHI...CTP...
     
     
    
 

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DISCUSSION...STRONG/SEVERE STORM DEVELOPMENT IS NOW UNDERWAY ALONG

AND TO THE EAST OF THE NORTH CENTRAL APPALACHIANS. ACTIVITY IS

EXPECTED TO CONTINUE TO INCREASE AND INTENSIFY...AHEAD OF THE

MID-LEVEL TROUGH SHIFTING TOWARD NORTHERN MID ATLANTIC COASTAL

AREAS. DEEP LAYER FLOW AND SHEAR ARE SOMEWHAT MODEST...BUT HIGH

BOUNDARY LAYER MOISTURE CONTENT AND HUMIDITY...COUPLED WITH AMBIENT

VERTICAL VORTICITY...MAY CONTRIBUTE TO THE RISK FOR A FEW...AT LEAST

WEAK...TORNADOES IN DISCRETE STORMS. PRECIPITATION LOADING WITHIN

CONSOLIDATING CONVECTION WILL ALSO CONTRIBUTE TO THE RISK FOR

POTENTIALLY DAMAGING WIND GUSTS.

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