FVXX20 KWBC 171335 VOLCANIC ASH ADVISORY ISSUED 1330 UTC 17 SEP 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-243 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: THE MONTSERRAT VOLCANO OBSERVATORY. GOES-8 IMAGERY. 17/1200 UTC SOUNDING FROM GUADELOUPE. . ERUPTION DETAILS: MODERATE EXPLOSION AROUND 17/0340 UTC. . DETAILS OF ASH CLOUD: THE MVO REPORTED THAT SINCE THE EXPLOSION THIS MORNING THAT THERE HAS BEEN SO SIGNIFICANT ACTIVITY SINCE. NOTHING CAN BE SEEN ON GOES-8 SATELLITE IMAGERY DUE TO THE REMNANTS OF TD 12 MOVING WESTWARD THROUGH THE LEEWARD ISLANDS. THE MVO REPORTS THAT THERE HAS BEEN AT LEAST ONE EXPLOSION PER DAY AND THESE TYPICALLY OCCUR AT NIGHT. THEREFORE THIS ADVISORY WILL CONTINUE AS LONG AS THERE IS A CREDIBLE THREAT TO AVIATION IN THE AREA. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH FROM SUMMIT LEVEL TO FL100 TO MOVE WEST AT 20 TO 30 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT ADVISORY WILL BE ISSUED BY 17/1930 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. . HUGHES . NNNN