FVXX20 KNES 011939 VOLCANIC ASH ADVISORY ISSUED: 2004OCT01/1938Z VAAC: WASHINGTON VOLCANO: ST. HELENS 1201-05 LOCATION: N4612W12211 AREA: US-WASHINGTON SUMMIT ELEVATION: 8363 FT (2549 M) ADVISORY NUMBER: 2004/004 INFORMATION SOURCE: GFS MODEL WINDS. GOES-10. USGS. ERUPTION DETAILS: ASH EMISSION AROUND 19Z OBS ASH DATE/TIME: 01/1930Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL160 MOVING TO S 10-20 KNOTS. FCST ASH CLOUD +6H: NOT AVBL FCST ASH CLOUD +12H: NOT AVBL FCST ASH CLOUD +18H: NOT AVBL REMARKS: A VERY SMALL AREA OF ASH JUST SOUTH OF THE VOLCANO COULD BE SEEN IN GOES IMAGERY AT 1915Z BUT WAS TOO FAINT TO SEE BY 1930Z. PLUME IS MOSTLY STEAM BUT WITH SOME ASH. THE ACTIVE EMISSION LASTED ABOUT 10 MINUTES AND IS NOW BELIEVED TO BE OVER BUT A VERY SMALL AMOUNT OF ASH REMAINS IN THE ATMOSPHERE. ASH TOPS ARE ESTIMATED TO BE BETWEEN FL120 AND FL160. ... THIS PRODUCTS HEADER WILL CHANGE FROM KWBC TO KNES EFFECTIVE OCT 28, 2004. NEXT ADVISORY: WILL BE ISSUED BY 2004OCT02/0145Z NNNN