FVXX21 KWBC 011850 VOLCANIC ASH ADVISORY ISSUED 1850 UTC 01 JUL 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-769 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY. WINDS FORECAST FROM THE AVIATION MODEL. GEOPHYSICAL INSTITUTE REPORT. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 01/1815 UTC DOES NOT INDICATE ANY ASH DUE TO EXTENSIVE SUMMIT LEVEL CLOUDINESS AROUND THE VOLCANO. THE GEOPHYSICAL INSTITUTE REPORTED A SMALL GAS AND ASH COLUMN NEAR THE SUMMIT TO AROUND FL250 EARLIER THIS MORNING HOWEVER CLOUDS NOW OBSCURE THE VIEW FROM THE GROUND ALSO. . TRAJECTORY: ANY ASH FROM THE SUMMIT TO AROUND FL250 IS FORECAST TO MOVE TOWARD THE WEST TO NORTHWEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 02/0100 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORIES 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