FVXX20 KWBC 182300 VOLCANIC ASH ADVISORY ISSUED: 2001FEB18/2300Z VAAC: WASHINGTON . VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: 1643N 6211W AREA: CARIBBEAN . SUMMIT ELEVATION: 3000 FT (915 M) . ADVISORY NUMBER: 2001/107 . INFORMATION SOURCE: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. . ERUPTION DETAILS: ROCKFALLS PRODUCING ASH. . DETAILS OF ASH CLOUD: THE LAST VISIBLE SATELLITE IMAGERY OF THE DAY CONTINUED TO SHOW A FAINT ASH PLUME TO FL070 EXTENDING FROM THE SUMMIT TOWARD THE WEST. HOWEVER THIS FAINT LOW ASH COULD NOT BE SEEN IN INFRARED OR MULTSPECTRAL IMAGERY. SINCE NIGHTFALL ONLY INFRARED AND MULTISPECTRAL IMAGERY HAS BEEN AVAILABLE SO NO ASH HAS BEEN SEEN THROUGH 2245Z . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH UP TO FL070 WILL MOVE TO THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 19/0500Z. . 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