FVXX22 KWBC 311640 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1640 UTC 31 JAN 2000 BY THE WASHINGTON VAAC . SAN CRISTOBAL 00-016 NICARAGUA 1242N 8700W . BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02) SUMMIT HEIGHT 5725 FT (1745M) . SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL IMAGERY...1600 UTC CHINANDEGA SURFACE REPORT... . ERUPTION DETAILS: OCCASIONAL LIGHT ASH AND STEAM EMISSIONS... . DETAILS OF ASH CLOUD: GOES-8 SATELLITE IMAGERY OVER THE LAST HOUR SUGGESTS THAT THERE IS SOME LIGHT ASH AND STEAM VENTING FROM THE SUMMIT. IN ADDITION THERE IS A SURFACE REPORT OUT OF CHINANDEGA INDICATING ASH. THE EMISSIONS ARE BELIEVED TO BE NEAR-SUMMIT WITH A HEIGHT UP TO FL060. . TRAJECTORY: WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE LATEST SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 31/2230 UTC. . 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/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN