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Severe Thunderstorm Watch 592
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WW0592 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 592
   NWS STORM PREDICTION CENTER NORMAN OK
   1030 AM EDT FRI JUL 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          DISTRICT OF COLUMBIA
          EASTERN MARYLAND
          NORTH CENTRAL NORTH CAROLINA
          CENTRAL AND PARTS OF EASTERN VIRGINIA
          FAR EASTERN WEST VIRGINIA
          COASTAL WATERS
   
   EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL
   500 PM EDT.
   
   HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH
   NORTHWEST OF BALTIMORE MARYLAND TO 35 MILES EAST SOUTHEAST OF
   GREENSBORO NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH
   SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   DISCUSSION...TSTMS DEVELOPING OVER THE BLUE RIDGE SHOULD INCREASE IN
   COVERAGE AND INTENSITY TODAY WHILE PROGRESSING EWD INTO THE PIEDMONT
   AND EVENTUALLY COASTAL PLAINS.  INFLOW AIR MASS IS MOIST...AND WHEN
   COUPLED WITH MODEST DIABATIC HEATING AND STEEP MIDLEVEL LAPSE
   RATES...ENVIRONMENT WILL BECOME MODERATELY UNSTABLE BY AFTERNOON
   WITH MLCAPE OF AT LEAST 1000-1500 J/KG.  REGIONAL VWPS INDICATE A
   NOTABLE INCREASE IN MID/HIGH-LEVEL FLOW IN CONJUNCTION WITH SHORT
   WAVE TROUGH CURRENTLY MOVING THROUGH THE CUMBERLAND PLATEAU.  THIS
   STRENGTHENING VERTICAL SHEAR IN CONCERT WITH THE MODERATE
   INSTABILITY SHOULD FOSTER ORGANIZED LINE SEGMENTS AND PERHAPS
   SUPERCELL STRUCTURES WITH THE PRIMARY SEVERE THREATS BEING DAMAGING
   WINDS AND HAIL.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 27035.
   
   
   ...MEAD/IMY
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