FVXX22 KWBC 180700 VOLCANIC ASH ADVISORY ISSUED 0700 UTC 18 AUG 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-147 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: GOES-8 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 0615 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. . 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 18/1300 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. . BROWN . NNNN