FVXX21 KWBC 250640 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0640 UTC 25 FEB 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-236 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...GEOPHYSICAL INSTITUTE...0000 UTC AVIATION MODEL UPPER AIR SOUNDING DATA. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 25/0615 UTC DOES NOT SHOW ANY SIGNS OF ASH. HOWEVER ONCE AGAIN THERE IS AN ABUNDANCE OF CLOUDINESS DUE TO SHOWER AND THUNDERSTORM ACTIVITY. SO AGAIN IT IS FEASIBLE THAT ASH CAN BE VENTING FROM THE SUMMIT AND BE UNDETECTABLE SINCE IT IS EMBEDDED WITHIN THE CLOUD DECKS. THE LAST REPORT OF ASH WAS AT 1225 UTC ON FEBRUARY 24TH. AT THAT TIME THE GEOPHYSICAL INSTITUTE INDICATED THAT ASH WAS REACHING FL280. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO FL280 IS EXPECTED TO MOVE TO THE WEST-NORTHWEST AT 10 TO 15 KNOTS. OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 25/1300 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