FVXX23 KWBC 202330 VOLCANIC ASH ADVISORY STATEMENT ISSUED 2330 UTC 20 FEB 2000 BY THE WASHINGTON VAAC . SAN CRISTOBAL 00-033 NICARAGUA 1242N 8700W . BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02) SUMMIT HEIGHT 5725 FT (1745 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. CHINANDEGA SURFACE OBSERVATIONS. 12 HOUR WINDS FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: EMISSION OF ASH AND GASES BEGINNING TIME UNKNOWN. . DETAILS OF ASH CLOUD: THE 20 UTC AND 22 UTC CHINANDEGA SURFACE OBSERVATIONS REPORTED VOLCANIC ASH AS A RESTRICTION TO VISIBILITY. NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 20/2245 UTC EITHER BECAUSE THE ASH IS LOW LEVEL OR BECAUSE METEOROLOGICAL CLOUDS COVER MUCH OF THE AREA NEAR THE VOLCANO. THE ASH IS BELIEVED TO PROBABLY BE BELOW FL060. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT ABOUT FL060 WILL MOVE TOWARD THE WEST SOUTHWEST AT APPROXIMATELY 25 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 21/0530 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. . NNNN