FVXX22 KWBC 032115 VOLCANIC ASH ADVISORY STATEMENT ISSUED 2115 UTC 03 DEC 1999 BY THE WASHINGTON VAAC . SAN CRISTOBAL 99-009 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...1200 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA . ERUPTION DETAILS: ASH AND STEAM VENTING...STARTING POSSIBLY AROUND 1630 UTC BUT WITH MORE SIGNIFICANT VENTING AND A PLUME EVIDENT IN THE LAST 30 TO 60 MINUTES. . DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 03/2045 UTC SUGGESTS THAT THE SAN CRISTIBAL VOLCANO HAS BECOME ACTIVE THIS AFTERNOON AND IS RELEASING A SMALL AMOUNT OF ASH AND STEAM. THERE IS NOW A PLUME EVIDENT PUSHING TO THE WEST OF THE SUMMIT WHICH IS BELIEVED TO BE PARTIALLY ASH. ASH AND STEAM ARE ESTIMATED TO BE REACHING FL070 WHICH WOULD MAKE THE ACTIVITY NEAR-SUMMIT. . TRAJECTORY: WEST AT 10 TO 15 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 ISSUED WITHIN THE NEXT 15 MINUTES AND WILL INCLUDE A GRAPHIC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON . NNNN