FVXX20 KWBC 201100 VOLCANIC ASH ADVISORY ISSUED 1100 UTC 20 SEP 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-255 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. 20/0000 UTC SOUNDING FROM GUADELOUPE. 20/1200 UTC UPPER WINDS FORECAST FROM THE 20/0000 UTC AVIATION MODEL. . ERUPTION DETAILS: LOW LEVEL ASH EMISSIONS. . DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 1045 UTC DOES NOT INDICATE THE PRESENCE OF ASH AT THIS TIME. ASH EMISSIONS HAVE BEEN OCCURRING DAILY AND VISIBLE IMAGERY WILL BE MONITORED QUITE CLOSELY TODAY FOR ADDITIONAL ACTIVITY. TYPICAL ASH EMISSIONS HAVE BEEN BELOW FL100. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH UP TO FL100 WOULD MOVE NORTHWEST AT 10 TO 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 20/1700 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. . HUGHES . NNNN