FVXX22 KWBC 272225
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2225 UTC 27 NOV 1999 BY THE WASHINGTON VAAC 
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SAN CRISTOBAL  99-007   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..VISIBLE..AND MULTISPECTRAL
IMAGERY...1200 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA...
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ERUPTION DETAILS: SATELLITE IMAGERY SUGGESTS A POSSIBLE SMALL
ERUPTION BEGINNING AROUND 1900 UTC WITH MINOR ASH VENTING OCCURRING
EVER SINCE.
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DETAILS OF ASH CLOUD: GOES-8 VISIBLE SATELLITE IMAGERY THROUGH
27/2145 APPEARS TO BE INDICATING A SMALL ASH PLUME LEAVING THE
SUMMIT OF THE SAN CRISTOBAL VOLCANO AND EXTENDING TO THE WEST AND
SOUTHWEST. THE PLUME IS VERY NARROW AND IS ESTIMATED TO BE REACHING
FL070. THEREFORE THE ACTIVITY COULD BE DECLARED NEAR-SUMMIT. NO
OTHER CHANNELS OF SATELLITE IMAGERY SUGGEST ANY ASH AND SO THIS
SUPPORTS A LOW-LEVEL ASH EVENT.
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AT 27/2145 UTC THE PLUME EXTENDS 112 KM (60 NMI) FROM THE SUMMIT TO
THE WEST-SOUTHWEST WHICH IS AT 12.34N 87.96W. IT IS 24 KM (13 NMI)
WIDE.
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TRAJECTORY: CURRENT MOVEMENT IS TO THE WEST-SOUTHWEST AT 10 TO 15
KNOTS. UPPER-AIR MODEL SOUNDING DATA SUPPORTS THIS MOVEMENT ALSO.
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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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THE NEXT STATEMENT WILL BE ISSUED BY 28/0430 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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