FVXX21 KWBC 171300 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1300 UTC 17 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-579 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM THE AVIATION MODEL. GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMET. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS AND OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: THE GUAYAQUIL MWO INDICATES THAT VOLCANIC ASH IS REPORTED BY THE GEOPHYSICAL INSTITUTE TO AROUND FL250 AND MOVING WEST. NO ASH CAN BE DETECTED IN SATELLITE IMAGERY THROUGH 17/1215 UTC DUE TO THE EXTENSIVE WEATHER CLOUDS IN THE AREA. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AROUND FL250 WOULD MOVE TOWARD THE WEST AROUND 20 KNOTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 17/1900 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. . NNNN