FVXX21 KWBC 161705
.
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1705 UTC 16 DEC 1999 BY THE WASHINGTON VAAC 
.
TUNGURAHUA 99-255       ECUADOR 1.47S 78.44W 
.
BACKGROUND:    TUNGURAHUA ECUADOR (1502-08)
               SUMMIT HEIGHT 16480 FT (5023 M)
.
SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL
IMAGERY...1200 UTC AVIATION MODEL WIND FORECAST...GEOPHYSICAL
INSTITUTE REPORT AND UPPER AIR DATA.
.
ERUPTION DETAILS: STEAM EMISSIONS WITH OCCASIONAL PULSES OF ASH.
.
DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 1615
UTC.  THE DENSE WEATHER CLOUDS IN THE AREA IS HINDERING THE
DETECTION OF ANY ASH THAT MIGHT BE PRESENT. SIGMET 2 FROM GUAYAQUIL
REPORTED A PIREP WITH ASH BETWEEN FL260/270 MOVING N AT 26 KNOTS. 
.
TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN FL250
AND FL300 WOULD MOVE NORTHWARD.
.
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  
http://www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
.
OUTLOOK:  SEE 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 BY 16/2300 UTC.
.
PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
.
BROWN
.
NNNN