FVXX24 KWBC 090030 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0030 UTC 09 DEC 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-015 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...CHINANDEGA SURFACE OBSERVATION . ERUPTION DETAILS: POSSIBLE SMALL ERUPTION IN THE LAST HOUR... . DETAILS OF ASH CLOUD: THE LATEST SURFACE OBSERVATION FROM CHINANDEGA IN NICARAGUA INDICATES THAT THE SAN CRISTOBAL VOLCANO IS ACTIVE. SATELLITE IMAGERY THROUGH 08/2345 UTC DOES NOT INDICATE ANY ASH CLOUDS IN THE VICINITY OF THE VOLCANO. HOWEVER IT IS BELIEVED THAT THE ACTIVITY IS LOW-LEVEL WHICH WOULD BE DIFFICULT TO DETECT IN MULTISPECTRAL AND INFRARED IMAGERY. SINCE BECOMING ACTIVE LAST MONTH THE VOLCANO HAS TYPICALLY SENT ASH TO BETWEEN FL070 AND FL100. . TRAJECTORY: ASH BETWEEN THE SUMMIT AND FL100 SHOULD MOVE TO THE WEST-SOUTHWEST 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 ISSUED BY 09/0630 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN