WAUS42 KKCI 172045 WA2S MIAS WA 172045 AIRMET SIERRA UPDT 4 FOR IFR AND MTN OBSCN VALID UNTIL 180300 . NO SGFNT IFR EXP OUTSIDE OF CNVTV ACT. . AIRMET MTN OBSCN...NC SC GA WV VA FROM EKN TO 50SW CSN TO CLT TO ATL TO GQO TO HMV TO 50S HNN TO EKN MTNS OBSC BY CLDS/PCPN/BR. CONDS CONTG BYD 03Z THRU 09Z. . OTLK VALID 0300-0900Z...MTN OBSCN NC SC GA NY PA WV MD VA BOUNDED BY JHW-40WSW HNK-HAR-20N CSN-CLT-40SE ODF-ATL-GQO-HMV- HNN-JHW MTNS OBSC BY CLDS/BR. CONDS CONTG THRU 09Z. ....