FVXX21 KWBC 040730 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0730 UTC 04 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-202 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. AVIATION MODEL WIND FORECAST. . ERUPTION DETAILS: LAST VISIBLE ASH PLUME 01 DECEMBER 1245 UTC. . DETAILS OF ASH: THICK METEOROLOGICAL CLOUDS COVER THE AREA OF THE VOLCANO MAKING ANY DETECTION OF ASH VERY DIFFICULT. NO ASH CAN BE SEEN THROUGH 04/0645 UTC. . TRAJECTORY: ANY ASH AT FL300 WOULD MOVE TOWARD THE SOUTHWEST AT 10KT. . 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. . EFFECTIVE JANUARY 3 2000 AT 0000 UTC... ALL REFERENCES TO LATITUDE AND LONGITUDE IN VOLCANIC ASH ADVISORY STATEMENTS WILL BE IN DEGREES AND MINUTES OF A DEGREE. EXAMPLE: 16.70N 62.20W WILL BE 1642N6212W . THE NEXT STATEMENT WILL BE ISSUED BY 04/1330 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN