FVXX20 KWBC 150200 VOLCANIC ASH ADVISORY ISSUED 0200 UTC 15 SEP 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-231 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. 15/0000 UTC GUADELOUPE UPPER AIR SOUNDING. MONTSERRAT VOLCANO OBSERVATORY. . ERUPTION DETAILS: PYROCLASTIC FLOW AROUND 1900 UTC AND CONTINUED LOW LEVEL ASH AND STEAM EMISSIONS. . DETAILS OF ASH CLOUD: NO ASH CAN BE SEEN IN CURRENT SATELLITE IMAGERY. THE MONTSERRAT VOLCANO OBSERVATORY REPORTED A PYROCLASTIC FLOW OCCURRED AROUND 1900 UTC WHICH PRODUCED ASH ESTIMATED TO BE BELOW FL150. THE LAST VISIBLE IMAGERY CONTINUED TO SHOW LOW LEVEL ASH TO THE WEST NORTHWEST OF THE SUMMIT. TRAJECTORY: ASH AT OR BELOW FL150 IS EXPECTED TO MOVE TOWARD THE WEST NORTHWEST AT ABOUT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 15/0800 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