TAF KHST 210400Z 2104/2210 33009KT 9999 FEW025 FEW250 QNH3004INS 
  BECMG 2114/2115 34010G15KT 9999 FEW030 FEW250 QNH3007INS 
  BECMG 2123/2124 33007KT 9999 FEW030 QNH3011INS TX21/2118Z TN12/2111Z