FVXX22 KWBC 180100 VOLCANIC ASH ADVISORY ISSUED 0100 UTC 17 AUG 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-146 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY. 18/0000 UTC UPPER AIR SOUNDING FROM GUADELOUPE. THE MONTSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: ROCKFALLS AND SMALL PYROCLASTIC FLOWS. . DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 0015 UTC DOES NOT INDICATE THE PRESENCE OF ASH. ANY FAINT ASH AT OR BELOW FL050 WOULD BE TOO THIN TO DETECT ON INFRARED AND MULTISPECTRAL IMAGERY. THE VOLCANO REMAINS IN A SLIGHTLY ELEVATED SEISMIC STATE AND PYROCLASTIC FLOWS AND ROCKFALLS ARE LIKELY. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT OR BELOW FL050 TO MOVE SOUTHWEST AT 5 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 18/0700 UTC. . REAL TIME SATELLITE IMAGERY AND VOLCANIC ASH ADVISORIES OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS HTTP://WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML (ALL LOWER CASE EXCEPT /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . HUGHES . NNNN