FVXX20 KWBC 171200 VOLCANIC ASH ADVISORY ISSUED: 2001AUG17/1200Z VAAC: WASHINGTON . VOLCANO: TUNGURAHUA 1502-08 LOCATION: 0128S 7826W AREA: ECUADOR . SUMMIT ELEVATION: 16480 FT (5023 M) . ADVISORY NUMBER: 2001/183 . INFORMATION SOURCE: GOES-8 VISIBLE/INFRARED/MULTISPECTRAL IMAGERY. 17/1200Z UPPER WINDS FORECAST FROM THE 17/0600Z AVIATION MODEL. GUAYAQUIL MET WATCH OFFICE. . ERUPTION DETAILS: NEARLY CONTINUOUS ERUPTION SINCE 06/1203Z. . DETAILS OF ASH CLOUD: GOES-8 IMAGERY THROUGH 1115Z INDICATES THE VOLCANO HAS ENTERED A RELATIVELY QUIET STAGE. NO ASH CAN BE DETECTED IN SATELLITE IMAGERY FROM PREVIOUS ERUPTIONS. THE VOLCANO REMAINS IN A VERY ACTIVE STATE AND COULD PRODUCE ASH EMISSIONS AT ANYTIME. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST ANY ASH AT OR NEAR SUMMIT LEVEL TO MOVE WEST AT 5 TO 10 KNOTS. ASH FROM FL170 TO FL300 WOULD MOVE NORTHWEST AT 5 TO 10 KNOTS. ASH ABOVE FL300 WOULD MOVE NORTHEAST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT ADVISORY WILL BE ISSUED BY 17/1800Z. . INTERNET URLS... MESSAGE LISTSERV WWW.SSD.NOAA.GOV/VAAC/SUBSCRIBE.HTML MESSAGES GRAPHICS AND IMAGERY WWW.SSD.NOAA.GOV/VAAC/WASHINGTON.HTML (ALL LOWERCASE EXCEPT /VAAC/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . HUGHES . NNNN