FVXX20 KWBC 010300 VOLCANIC ASH ADVISORY ISSUED 0300 UTC 01 JUL 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-107 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL SATELLITE IMAGERY. MONTSERRAT VOLCANO OBSERVATORY. AVIATION MODEL WINDS. . ERUPTION DETAILS: INCREASED SEISMIC ACTIVITY... PYROCLASTIC FLOWS AND ROCKFALLS... . DETAILS OF ASH CLOUD: THE LOW LEVEL VOLCANIC ASH PLUME FROM SOUFRIERE HILLS DOES NOT SHOW UP IN INFRARED AND MULTISPECTRAL SATELLITE IMAGERY THROUGH 01/0215 UTC. HOWEVER THE LAST VISIBLE IMAGE AT 30/2215 UTC SHOWED A NARROW PLUME OF ASH MOVING TO THE NORTHWEST OF THE VOLCANO. THE PLUME AT THAT TIME WAS ESTIMATED AT FL100. THE MONTSERRAT VOLCANO OBSERVATORY REPORTED INCREASED SEISMIC ACTIVITY AND ROCKFALLS. . TRAJECTORY: ASH UP TO FL100 IS MOVING TO THE NORTHWEST AT 20 TO 25 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 01/0900 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER 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. . KARST . NNNN