SVR T-STRM WARNING FOR. S. CHESTER COUNTY IN S.E. PENNSYLVANIA UNTIL 845 PM : AT 808 PM. NWS RADAR INDICATED A SVR T-STRM CAPABLE OF PRODUCING NICKEL SIZE HAIL. AND DAMAGING WINDS IN EXCESS OF 60. THIS STORM WAS LOCATED NR PARKESBURG. OR ABOUT 18 MILES N. OF NEWARK. AND MOVING S.E. AT 30.