Extra-Trop off East Coast - Tornadoes Possible
Posted by JAC on 9/11/2009, 8:41 am









A NON-TROPICAL AREA OF LOW PRESSURE CENTERED JUST OFF THE DELAWARE
COAST IS PRODUCING HEAVY RAIN...GUSTY WINDS...AND MINOR COASTAL
FLOODING ALONG PORTIONS OF THE MID-ATLANTIC COAST.  DEVELOPMENT
INTO A TROPICAL OR SUBTROPICAL CYCLONE IS NOT EXPECTED DUE TO
UNFAVORABLE UPPER-LEVEL WINDS. THERE IS A LOW CHANCE...LESS THAN 30
PERCENT...OF THIS SYSTEM BECOMING A TROPICAL OR SUBTROPICAL CYCLONE
DURING THE NEXT 48 HOURS.  FOR ADDITIONAL INFORMATION...PLEASE
REFER TO PRODUCTS ISSUED BY LOCAL NATIONAL WEATHER SERVICE OFFICES
IN THE REGION AND HIGH SEAS FORECASTS ISSUED BY THE NATIONAL
WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER
FZNT01 KWBC.




URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 739
  NWS STORM PREDICTION CENTER NORMAN OK
  405 AM EDT FRI SEP 11 2009
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         DELAWARE
         SOUTHERN AND CENTRAL NEW JERSEY
         COASTAL WATERS
 
  EFFECTIVE THIS FRIDAY MORNING FROM 405 AM UNTIL NOON EDT.
 
  TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
  GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
  AREAS.
 
  THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 30 STATUTE
  MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF
  LAKEHURST NEW JERSEY TO 35 MILES SOUTH SOUTHEAST OF DOVER
  DELAWARE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
  ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).
 
  REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
  TORNADOES AND 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.
 
  DISCUSSION...SFC LOW NOW APPROX. 75 NM E OF OCEAN CITY MD EXPECTED
  TO CONTINUE SLOWLY N OR POSSIBLY NNW THROUGH LATER THIS MORNING.
  BELT OF MODERATE TO STG ESE 925-700 MB FLOW WILL ADVECT A TONGUE OF
  INCREASINGLY WARM/MOIST AIR WNWWD INTO DELAWARE BAY AND SRN/CNTRL
  NJ.  COUPLED WITH STRONGLY VEERING LOW LVL WIND PROFILES AND
  CONVERGENT LOW LVL FLOW...SETUP MAY YIELD SMALL CLUSTERS OF STORMS
  WITH LOW LVL ROTATION/ISOLD TORNADOES.



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Extra-Trop off East Coast - Tornadoes Possible - JAC, 9/11/2009, 8:41 am
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