FVXX21 KWBC 170900 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0900 UTC 17 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-452 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...NATIONAL WEATHER SERVICE FORECAST MODEL DATA. . ERUPTION DETAILS: NEARLY CONTINUOUS GAS EMISSIONS WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY OVER THE LAST 4 TO 5 HOURS ENDING THROUGH 0815 UTC SHOWS NO SIGNS OF ASH OR STEAM. THE GEOPHYSICAL INSTITUTE HAS NOT REPORTED ANY RECENT ERUPTIONS OR ASH EMISSIONS. THERE IS AN ABUNDANCE OF CLOUDINESS IN THE REGION WHICH IS OBSCURING THE SUMMIT. ANY ASH AND STEAM THAT IS PRESENT WILL LIKELY BE EMBEDDED IN THESE CLOUDS. THE LAST HEIGHT ASSESSMENT WAS FL220 BASED ON SATELLITE INTERPRETATION AND MODEL GUIDANCE. . TRAJECTORY: ASH AND STEAM FROM THE SUMMIT TO FL220 IS EXPECTED TO MOVE TO THE SOUTHWEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 17/1500 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