FVXX21 KWBC 151700 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1700 UTC 15 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-571 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY. 12 HOUR WIND FORECAST FROM THE 15/0600 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 15/1615 UTC SHOWS THICK LAYERED CLOUDS OBSCURING THE AREA OVER AND AROUND THE VOLCANO MAKING ASH DETECTION DIFFICULT. THE GEOPHYSICAL INSTITUTE REPORTED MODERATE EXPLOSIONS OF THE VOLCANO OVERNIGHT. ASH WAS LAST REPORTED OVER THE VOLCANO BY THE INSTITUTE AT 15/0029 AND ITS HEIGHT WAS ESTIMATED AT FL260. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL260 WOULD MOVE TOWARD THE WEST AT 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 15/2300 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS 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. . CLARK . NNNN