000 WAUS41 KKCI 242045 WA1S BOSS WA 242045 AIRMET SIERRA UPDT 6 FOR IFR AND MTN OBSCN VALID UNTIL 250300 . NO SGFNT IFR EXP OUTSIDE OF CNVTV ACT. . AIRMET MTN OBSCN...ME NH VT NY FROM 60E YQB TO 30W MLT TO 20ENE MPV TO 30ENE HNK TO 50E MSS TO 80S YQB TO 60E YQB MTNS OBSC BY CLDS/BR. CONDS ENDG 21-00Z. ....