Severe thunderstorm watch for western NJ

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  District of Columbia
  northern Delaware
  much of Maryland
  New Jersey
  eastern Pennsylvania
  northern Virginia
  coastal waters

* effective this Tuesday afternoon and evening from 320 PM until
  1100 PM EDT.

* Primary threats include...
  isolated damaging wind gusts to 70 mph possible
  isolated large hail events to 1.5 inches in diameter possible

Summary...north-south squall line is gradually intensifying over
central Pennsylvania into western Maryland.  Damaging winds can be
expected with this line of convection as it spreads toward New
Jersey.

The Severe Thunderstorm Watch area is approximately along and 70
statute miles east and west of a line from 25 miles south
southwest of Baltimore Maryland to 40 miles north of Allentown
Pennsylvania.  For a complete depiction of the watch see the
associated watch outline update (wous64 kwns wou7).

Precautionary/preparedness actions...

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.


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 25030.