FVXX22 KWBC 272215 VOLCANIC ASH ADVISORY STATEMENT ISSUED 2215 UTC 27 NOV 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-006 NICARAGUA 12.7N 87.0W . BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02) SUMMIT HEIGHT 5725 FT (1745 M) . SOURCES OF INFORMATION: GOES-8 INFRARED..VISIBLE..AND MULTISPECTRAL IMAGERY...1200 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA... . ERUPTION DETAILS: SATELLITE IMAGERY SUGGESTS A POSSIBLE SMALL ERUPTION BEGINNING AROUND 1900 UTC WITH MINOR ASH VENTING OCCURRING EVER SINCE. . DETAILS OF ASH CLOUD: GOES-8 VISIBLE SATELLITE IMAGERY THROUGH 27/2145 APPEARS TO BE INDICATING A SMALL ASH PLUME LEAVING THE SUMMIT OF THE SAN CRISTOBAL VOLCANO AND EXTENDING TO THE WEST-SOUTHWEST. THE PLUME IS VERY NARROW AND IS ESTIMATED TO BE REACHING FL070. THEREFORE THE ACTIVITY COULD BE DECLARED NEAR-SUMMIT. NO OTHER CHANNELS OF SATELLITE IMAGERY SUGGEST ANY ASH AND SO THIS SUPPORTS A LOW-LEVEL ASH EVENT. . TRAJECTORY: CURRENT MOVEMENT IS TO THE WEST-SOUTHWEST AT 10 TO 15 KNOTS. UPPER-AIR MODEL SOUNDING DATA SUPPORTS THIS MOVEMENT ALSO. . 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 WITHIN THE NEXT 30 MINUTES ACCOMPANIED BY A GRAPHIC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN