FVXX22 KWBC 211330 VOLCANIC ASH ADVISORY ISSUED 1330 UTC 21 AUG 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-160 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. 1200 UTC GUADELOUPE UPPER AIR SOUNDING. 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 21/1245 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 SLIGHTLY DECREASED ACTIVITY LAST NIGHT. . TRAJECTORY: ASH BELOW FL080 WILL MOVE TOWARD THE WEST AT ABOUT 30 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 21/1930 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. . STREETT/CLARK . NNNN