FVXX20 KWBC 181605 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1605 UTC 18 DEC 1999 BY THE WASHINGTON VAAC . GUAGUA PICHINCHA 99-162 ECUADOR 0.17S 78.60W . BACKGROUND: GUAGUA PICHINCHA ECUADOR (1502-02) SUMMIT HEIGHT 15695 FT (4784 M) . SOURCES OF INFORMATION: THE GEOPHYSICAL INSTITUTE IN ECUADOR. GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. U.S. NUMERICAL MODEL WIND FORECAST. . ERUPTION DETAILS: THE GEOPHYSICAL INSTITUTE REPORTS THAT THERE HAVE BEEN NO EMISSIONS OF ASH RECENTLY. NO ASH IS VISIBLE ON RECENT GOES8 IMAGERY. . DETAILS OF ASH CLOUD: N/A . TRAJECTORY: N/A . GUAGUA PICHINCHA IS RESTLESS AND HAS THE POTENTIAL FOR AN EXPLOSIVE ERUPTION WITH LITTLE OR NO WARNING. NON-EXPLOSIVE LOW LEVEL AND NEAR SUMMIT ACTIVITY MAY BE OCCURRING. 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 SCHEDULED STATEMENT WILL BE A WATCH VAAS AT 19/1700 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . SCHWARTZ/NOAA/NESDIS/SAB . NNNN