FVXX21 KWBC 281030 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1030 UTC 28 NOV 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-178 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 MULTISPECTRAL AND INFRARED IMAGERY...REPORT FROM THE GEOFISICO INSTITUTO...WIND DATA FROM THE GEOFISICO INSTITUTO...VAFTAD...0000 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: CONTINUOUS ASH AND GAS EMISSIONS . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 1015 UTC. HOWEVER ASH DETECTION IN SATELLITE IMAGERY MIGHT BE HINDERED BY THE LOW AND MIDDLE LEVEL WEATHER CLOUDS IN THE AREA. IN THEIR MOST RECENT REPORT WHICH WAS YESTERDAY EVENING THE INSTITUTO GEOFISICO REPORTED ALMOST CONTINUOUS ASH CONTAINING EMISSIONS REACHING AT LEAST 1 KM ABOVE THE SUMMIT AND ON ONE OCCASION AS MUCH AS 4 KM ABOVE THE SUMMIT. THIS WOULD MEAN ASH RANGES FROM FL200 TO FL300. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL160 AND FL350 WILL MOVE TO THE SOUTHWEST AT ABOUT 15 KNOTS. . 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/) . OUTLOOK: SEE SIGMETS AND VAFTAD. . THE NEXT STATEMENT WILL BE ISSUED BY 28/1630 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN