SVR Thunderstorm Watch: DC/C MD/N-C NC/S-C PA/C&E VA 8 p

[Skywatch_NC]

Severe Thunderstorm Watch

urgent - immediate broadcast requested
Severe Thunderstorm Watch number 200
NWS Storm Prediction Center Norman OK
110 PM EDT Sat Apr 23 2005

The NWS Storm Prediction Center has issued a
Severe Thunderstorm Watch for portions of

District of Columbia
central Maryland
north central North Carolina
south central Pennsylvania
central and eastern Virginia
the extreme eastern West Virginia Panhandle
coastal waters

Effective this Saturday afternoon and evening from 110 PM until
800 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 55
statute miles east and west of a line from 20 miles north
northwest of Harrisburg Pennsylvania to 105 miles south southwest
of Richmond Virginia. For a complete depiction of the watch see
the associated watch outline update (wous64 kwns wou0).

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... thunderstorms are beginning to develop in S central
VA... and this activity should expand in coverage/intensity the next
few hours in conjunction with daytime heating. The combination of
weak instability... strong unidirectional wind profiles... and forcing
along the cold front/Lee trough should support line segments and
perhaps an embedded supercell or two. Damaging winds and large hail
will be the main severe threats through the afternoon.

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 400. Mean storm
motion vector 24035.