FVXX21 KWBC 071930 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1930 UTC 07 APR 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-412 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. 6 HOUR WIND FORECAST FROM THE 07/1200 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: VISIBLE IMAGERY THROUGH 07/1745 UTC INDICATES CLOUD COVER OVER THE AREA SURROUNDING THE SUMMIT. THE CLOUDS ARE IMPEDING ASH DETECTION IN THE VISIBLE CHANNEL. HOWEVER A POSSIBLE ASH PLUME APPEARED IN 07/1715 UTC MULTISPECTRAL IMAGERY TO THE SOUTHWEST OF THE SUMMIT. THE POSSIBLE AREA OF ASH EXTENDS 37 KM (20 NMI) TO A POINT 0137S7845W AND IS APPROXIMATELY 10 KM (5 NMI) WIDE. THE ASH IS ESTIMATED AT FL200. . TRAJECTORY: ANY VOLCANIC ASH PRESENT UP TO FL200 WOULD MOVE SOUTHWEST AT 15 TO 20 KTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 08/0130 UTC. . 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/) . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . CLARK . NNNN