WCCO31 SKBO 120250 SKED SIGMET 1 VALID 120127/120730 SKBO- SKED BOGOTA FIR VA ERUPTION MT VOLCAN NEVADO DEL RUIZ PSN N0453 W07519 VA CLD OBS AT 0020Z OBS VA CLD: SFC/FL200 N0454 W07519 - N0452 W07518 - N0438 W07521 - N0442 W07531 - N0454 W07519 MOV S 5KT=