FVXX21 KWBC 251300 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1300 UTC 25 FEB 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-237 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: FREQUENT EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 25/1215 UTC DOES NOT SHOW ANY ASH SIGNATURES ALTHOUGH THERE IS EXTENSIVE CLOUDINESS IN THE AREA. THE GEOPHYSICAL INSTITUTE REPORTED SEVERAL EXPLOSIONS OF GAS AND ASH OVERNIGHT WITH A ROUGH ESTIMATE OF FL280. 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 25/1900 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. . SCHWARTZ . NNNN