FVXX21 KWBC 190500 VOLCANIC ASH ADVISORY ISSUED 0500 UTC 19 JUN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-715 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. WIND FORECAST FROM AVIATION MODEL. SIGMET FROM GUAYAQUIL METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 19/0415 UTC SHOWS NO ASH ALTHOUGH LOW LEVEL PLUMES ARE USUALLY DIFFICULT TO DETECT AT NIGHT. THE LAST OBSERVATION BY THE GEOPHYSICAL INSTITUTE PLACED ASH AT FL250. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH FROM THE SUMMIT TO FL250 WOULD MOVE TOWARD THE WEST OR WEST SOUTHWEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 19/1100 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