FVXX21 KWBC 301900 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1900 UTC 30 DEC 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-315 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND INFRARED AND MULTISPECTRAL IMAGERY...GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: INTERMITTENT ASH AND STEAM EMISSIONS... . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 30/1815 UTC SHOWS NO EVIDENCE OF ASH IN THE VICINITY OF THE VOLCANO. SKIES HAVE CLOUDED UP OVER THE VOLCANO AGAIN MAKING IT MORE DIFFICULT TO DETECT ANY ASH. . TRAJECTORY: IF THERE WAS ASH UP TO FL250 IT WOULD MOVE TOWARDS THE WEST AT 10 TO 15KTS. . 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 31/0100 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . KARST/SAB/NOAA/NESDIS . NNNN