OHNS. SEV CAT FCST BTN 330 AND 380. SEV CAT REPD BY C550 AT 350 AT 1408Z. LN MOVG NWD 15 KT. LTL CHG EXPD. END/GFA34/CMAC-E/SF/BVW AIRMETS ----> KROS SIERRA (IFR) <---- AIRMET SIERRA UPDT 3 FOR IFR AND MTN OBSCN VALID UNTIL 212100 AIRMET IFR...NY LO PA OH LE WV FROM 80SW YOW TO 20SW PSB TO 30W AIR TO FW