FVXX22 KWBC 220230 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0230 UTC 22 NOV 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-002 NICARAGUA 12.7N 87.0W . BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02) SUMMIT HEIGHT 5725 FT (1745 M) SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...1800 UTC AVIATION MODEL SOUNDING DATA. ERUPTION DETAILS: CHINANDEGA NICARAGUA SURFACE OBSERVATION AT 1900 UTC INDICATED THE PRESENCE OF VOLCANIC ASH OVER THE STATION. DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 22/0145 UTC DOES NOT INDICATE ANY ASH CLOUDS OVER OR ADJACENT TO TO VOLCANO SITE. THE ASH SEEN EARLIER WAS DETECTED ONLY IN VISIBLE IMAGERY WHICH SUPPORTS THE LOW-LEVEL HEIGHT ASSIGNMENT. THERE IS STILL SUGGESTION OF ACTIVITY THOUGH AS THERE IS AN OCCASIONAL HOT SPOT SEEN IN MULTISPECTRAL IMAGERY. THIS IMPLIES AT LEAST THE POSSIBILITY THAT ASH COULD STILL BE VENTING AS IT WAS EARLIER BUT ONLY AT VERY LOW ALTITUDES. ANY ASH IS ESTIMATED TO BE FROM THE SUMMIT TO FL100. . TRAJECTORY: ASH FROM THE SUMMIT TO FL100 SHOULD MOVE TO THE WEST-SOUTHWEST AT 10 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. . THE NEXT STATEMENT WILL BE ISSUED BY 22/0830 UTC. PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN