FVXX21 KWBC 251702 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1702 UTC 25 FEB 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-238 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED MULTISPECTRAL AND VISIBLE IMAGERY...GEOPHYSICAL INSTITUTE...0600 UTC AVIATION MODEL UPPER AIR SOUNDING DATA. . ERUPTION DETAILS: EXPLOSIVE ERUPTION AT 25/1630 UTC . DETAILS OF ASH: THE GEOPHYSICAL INSTITUTE REPORTED AN EXPLOSIVE ERUPTION AT 25/1630 UTC BASED ON SEISMIC ACTIVITY. NO HEIGHT CAN BE DETERMINED BECAUSE OF EXTENSIVE CLOUDINESS. SATELLITE IMAGERY THROUGH 25/1615UTC DOES NOT SHOW ANY ASH SIGNATURES ALTHOUGH THIS IS BEFORE THE ERUPTION TIME. TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL280 IS FORECASTED TO MOVE TO THE WEST AT 10 TO 15 KNOTS. OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 25/2300 UTC OR SOONER IF ASH BECOMES VISIBLE. 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. . SCHWARTZ . NNNN