FVXX21 KWBC 160250 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0250 UTC 16 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-447 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...REPORTS FROM THE GEOPHYSICAL INSTITUTE...NATIONAL WEATHER SERVICE FORECAST MODELS. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS EMISSIONS WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 16/0215 UTC DOES NOT SHOW ANY DEFINITE AREAS OF ASH. SOME SHOWER AND THUNDERSTORM ACTIVITY IN THE REGION IS COMPLICATING THE DETECTION OF ASH. THE LAST REPORT OF ASH WAS BY THE GEOPHYSICAL INSTITUTE AT 15/1853 UTC WHEN ASH WAS OBSERVED TO FL300 OVER THE VOLCANO. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL300 IS EXPECTED TO MOVE TO THE WEST AND SOUTHWEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 16/0900 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. . ORRISON . NNNN