FVXX24 KWBC 090030
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0030 UTC 09 DEC 1999 BY THE WASHINGTON VAAC 
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SAN CRISTOBAL 99-015 NICARAGUA 12.7N 87.0W 
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BACKGROUND:    SAN CRISTOBAL NICARAGUA (1404-02)
               SUMMIT HEIGHT 5725 FT (1745 M)
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SOURCES OF INFORMATION:  GOES-8 INFRARED AND MULTISPECTRAL
IMAGERY...CHINANDEGA SURFACE OBSERVATION
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ERUPTION DETAILS: POSSIBLE SMALL ERUPTION IN THE LAST HOUR...
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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.
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TRAJECTORY: ASH BETWEEN THE SUMMIT AND FL100 SHOULD MOVE TO THE WEST-SOUTHWEST AT 10 TO 20 KNOTS.
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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/)
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OUTLOOK:  SEE LATEST SIGMETS.
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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 
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THE NEXT STATEMENT WILL BE ISSUED BY 09/0630 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN