FVXX21 KWBC 040430 . VOLCANIC ASH ADVISORY ISSUED 0430 UTC 04 NOVEMBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-071 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...GUAYAQUIL METEOROLOGICAL WATCH OFFICE...BULLETIN AND WIND DATA FROM THE INSTITUTO GEOFISICO IN ECUADOR...AVIATION MODEL WIND FORECAST DATA FROM THE U.S. NATIONAL WEATHER SERVICE. . ERUPTION DETAILS: ASH EMISSIONS AND INTERMITTENT EXPLOSIONS. THE INSTITUTO GEOFISICO REPORTS THAT ON NOVEMBER 3 THERE WAS THE SAME TYPE OF SEISMIC ACTIVITY AS THEY HAD BEEN RECORDING IN RECENT DAYS. . DETAILS OF ASH: NO ASH CAN CURRENTLY BE DETECTED IN SATELLITE IMAGERY AT 04/0345 UTC. HOWEVER AT ABOUT 0115 UTC SATELLITE IMAGERY SHOWED A SMALL FAINT AREA OF ASH NEAR THE VOLCANO SUMMIT. THIS ASH WAS AT ABOUT FL280 AND IT MOVED TOWARD THE SOUTH SOUTHWEST IN SUBSEQUENT IMAGERY BEFORE BECOMING TOO DIFFUSE TO OBSERVE AT 0245 UTC. . TRAJECTORY: UPPER AIR PATTERNS AND THE ASH MOVEMENT OBSERVED BETWEEN 0115 AND 0245 UTC SUGGEST THAT ASH BETWEEN FL240 AND FL300 WILL MOVE TOWARD THE SOUTH SOUTHWEST AT 10 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 04/1030 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN