FVXX21 KWBC 171430 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1430 UTC 17 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-453 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...NATIONAL WEATHER SERVICE MODEL WINDS FORECAST...APRIL 16 REPORT FROM THE GEOPHYSICAL INSTITUTE . ERUPTION DETAILS: NEARLY CONTINUOUS GAS EMISSIONS WITH OCCASIONAL ASH EMISSIONS. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 1345 UTC BECAUSE OF THE WEATHER CLOUDS COVERING THE AREA. ASH WAS MOST RECENTLY OBSERVED IN SATELLITE IMAGERY AT ABOUT 17/0215 UTC AND THIS ASH HAD AN ESTIMATED HEIGHT OF FL220. THE APRIL 16 REPORT FROM THE GEOPHYSICAL INSTITUTE INDICATED THE PRESENCE OF OCCASIONAL VOLCANIC EXPLOSIONS. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH THAT MIGHT BE PRESENT BETWEEN THE SUMMIT AND FL220 WILL MOVE TO THE WEST AT ABOUT 15 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 17/2030 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