FVXX21 KWBC 200320
.
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0320 UTC 20 DEC 1999 BY THE WASHINGTON VAAC 
.
TUNGURAHUA 99-269        ECUADOR 1.47S 78.44W 
.
BACKGROUND:    TUNGURAHUA ECUADOR (1502-08)
               SUMMIT HEIGHT 16480 FT (5023 M)
.
SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL
IMAGERY...19/1800 UTC AVIATION MODEL WIND FORECAST...
.
ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM...
.
DETAILS OF ASH: THE GOES-8 IMAGERY THRU 20/0245 UTC DOES NOT
INDICATE ANY ASH. A SMALL PLUME OF ASH AND STEAM WAS EVIDENT EARLIER
IN THE DAY BUT THIS PLUME HAS SINCE DISSIPATED. HOWEVER THERE HAVE
BEEN OCCASIONAL ASH AND STEAM EMISSIONS OCCURRING WITH LITTLE OR NO
WARNING OVER THE LAST WEEK. CAUTION IS STRONGLY ADVISED. ANY ASH AND
STEAM EMISSIONS HAVE BEEN TYPICALLY REACHING FL180.
.
TRAJECTORY: ANY ASH OR STEAM THAT REACHES FL180 WILL MOVE TO THE
WEST-SOUTHWEST AT ABOUT 15-20 KNOTS.
.
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 20/0900 UTC.
.
PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
.
ORRISON
.
NNNN