FVXX22 KWBC 211930 VOLCANIC ASH ADVISORY ISSUED 1930 UTC 21 AUG 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-161 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. WINDS FORECAST FROM THE AVIATION MODEL. MONTSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: ROCKFALLS AND MANY SMALL SCALE ASH EMISSIONS . DETAILS OF ASH CLOUD: SINCE THE AREA IS COVERED BY DENSE WEATHER CLOUDS NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 21/1845 UTC OR BY GROUND OBSERVATION AT THE SUMMIT. ASH WAS LAST SEEN AT 20/2145 UTC WITH A HEIGHT ESTIMATED TO BE BELOW FL080. THE MONTSERRAT VOLCANO OBSERVATORY REPORTS FEWER ROCKFALLS TODAY YET THE VOLCANO HAS A LARGE DOME AND CONTINUES TO BE UNSTABLE. . TRAJECTORY: ASH BELOW FL080 WILL MOVE TOWARD THE SOUTHWEST AT ABOUT 20 TO 30 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 22/0130 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. . CLARK . NNNN