WVCO31 SKBO 010730 SKED SIGMET A1 VALID 010715/011215 SKBO- SKED BOGOTA FIR VA ERUPTION MT VOLCAN NEVADO DEL RUIZ PSN N0453 W0751 9 VA CLD OBS AT 0540Z SFC/FL200 N0505 W07541 - N0502 W07536 - N0459 W 07538 - N0500 W07544 - N0505 W07541 MOV NW 15KT=