FVXX22 KWBC 161630 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1630 UTC 16 DEC 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-021 NICARAGUA 12.7N 87.0W . BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02) SUMMIT HEIGHT 5725 FT (1745 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY...1200 UTC AVIATION MODEL WIND FORECAST . ERUPTION DETAILS: LIGHT VENTING OF GASES AND POSSIBLY ASH. . DETAILS OF ASH CLOUD: NO ASH IS VISIBLE IN THE LATEST GOES-8 VISIBLE SATELLITE IMAGERY AT 1545 UTC. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL050 AND FL100 WOULD MOVE TO THE WEST OR SOUTHWEST AT 10 TO 20 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 www.ssd.noaa.gov/VAAC/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE LATEST 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 . THIS IS THE LAST STATEMENT FOR THIS EVENT. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . BROWN . NNNN