FVXX22 KWBC 272215
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 2215 UTC 27 NOV 1999 BY THE WASHINGTON VAAC 
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SAN CRISTOBAL  99-006   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-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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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 WITHIN THE NEXT 30 MINUTES
ACCOMPANIED BY A GRAPHIC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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ORRISON
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NNNN