WAUS44 KKCI 172045 WA4S DFWS 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...TN KY FROM 50S HNN TO HMV TO GQO TO 30ESE LOZ TO 50S HNN MTNS OBSC BY CLDS/PCPN/BR. CONDS ENDG BY 03Z. . OTLK VALID 0300-0900Z...MTN OBSCN TN KY BOUNDED BY HNN-HMV-GQO-50WSW LOZ-HNN MTNS OBSC BY CLDS/BR. CONDS DVLPG AFT 06Z. CONDS CONTG THRU 09Z. ....