FVXX20 KWBC 160550 VOLCANIC ASH ADVISORY ISSUED 0550 UTC 16 SEP 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-237 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. UPPER LEVEL WIND DATA FROM THE 16/0600 UTC GUADELOUPE SOUNDING. VOLCANO OBSERVATORY REPORT. . ERUPTION DETAILS: CONTINUED ROCKFALLS AND SMALL PYROCLASTIC FLOWS. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 16/0345 UTC DOES NOT SHOW ANY CURRENT ASH PLUME. LOW LEVEL PLUMES ARE NOTORIOUSLY DIFFICULT TO SEE WITHOUT VISIBLE IMAGERY. THE HOT SPOT NOTED EARLIER CAN NO LONGER BE SEEN. . TRAJECTORY: ASH AT OR BELOW FL100 IS EXPECTED TO MOVE WEST NORTHWEST AROUND 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 16/1200 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. . . NNNN