FVXX22 KWBC 032130
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2130 UTC 03 DEC 1999 BY THE WASHINGTON VAAC 
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SAN CRISTOBAL  99-010   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 VISIBLE INFRARED AND MULTISPECTRAL
IMAGERY...1200 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA
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ERUPTION DETAILS: ASH AND STEAM VENTING...STARTING POSSIBLY AROUND
1630 UTC BUT WITH MORE SIGNIFICANT VENTING IN THE LAST 30 TO 60
MINUTES.
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DETAILS OF ASH CLOUD: SATELLITE IMAGERY THROUGH 03/2045 UTC SUGGESTS
THAT THE SAN CRISTOBAL 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.
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THE ASH AND STEAM EXTENDS 68 KM (37 NMI) TO THE WEST AND SLIGHTLY
WEST-SOUTHWEST OF THE SUMMIT TO A POINT AT 12.43N 87.55W. THE PLUME
IS 35 KM (19 NMI) WIDE.
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TRAJECTORY: WEST AT 10 TO 15 KNOTS AS MEASURED IN SATELLITE IMAGERY
AND CONFIRMED BY 1200 UTC AVIATION MODEL SOUNDING DATA...
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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 04/0230 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN
"Attached Graphic Map Depicting Ash" 

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