FVXX22 KWBC 210130 VOLCANIC ASH ADVISORY ISSUED 0130 UTC 21 AUG 2000 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 00-158 WEST INDIES 1643N 6211W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. 0000 UTC GUADELOUPE UPPER AIR SOUNDING. . ERUPTION DETAILS: ROCKFALLS AND SMALL PYROCLASTIC FLOWS. . DETAILS OF ASH CLOUD: NO CURRENT ASH PLUME IS VISIBLE IN MULTISPECTRAL OR INFRARED IMAGERY THROUGH 21/0102 UTC. A FAINT ASH PLUME ESTIMATED BELOW FL080 WAS VISIBLE IN THE LAST FEW VISIBLE IMAGES OF THE DAY (THROUGH 20/2145 UTC). THIS TYPE OF PLUME IS VERY DIFFICULT TO DETECT IN MULTISPECTRAL OR INFRARED IMAGERY. . TRAJECTORY: ASH UP TO FL080 IS MOVING TOWARDS THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 21/0730 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