FVXX22 KWBC 152250 VOLCANIC ASH ADVISORY STATEMENT ISSUED 2250 UTC 15 DEC 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-017 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... . ERUPTION DETAILS: LIGHT VENTING OF GASES AND POSSIBLY ASH... . DETAILS OF ASH CLOUD: THE LATE DAY VISIBLE SATELLITE IMAGERY THROUGH 15/2215 UTC INDICATES WHAT MAY BE A THIN LAYER OF POSSIBLY ASH OR GASES PUSHING FROM THE SUMMIT OF SAN CRISTOBAL AND OFF TO THE WEST. THERE HAVE BEEN NO SURFACE REPORTS OF ANY ERUPTIONS OR THAT OF ANY ASH. HOWEVER THE VISIBLE SATELLITE IMAGERY WITH THE LOWER SUN ANGLE IS CLEARLY DEPICTING A PLUME COMING OFF THE SUMMIT AND EXTENDING TO A CONSIDERABLE DISTANCE TO THE WEST. MULTISPECTRAL AND INFRARED IMAGERY DO NOT SUGGEST ANYTING AT THIS TIME. . TRAJECTORY: THE GASES AND POSSIBLE ASH ARE SEEN MOVING TO THE WEST 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 . THE NEXT STATEMENT WILL BE ASAP AND WILL BE ACCOMPANIED BY A GRAPHIC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN