FVXX21 KWBC 041700 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1700 UTC 04 FEB 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-143 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE AND MULTISPECTRAL AND INFRARED IMAGERY. 12 HOUR WIND FORECAST FROM THE 04/0600 UTC AVIATION MODEL. GEOPHYSICAL INSTITUTE IN QUITO. . ERUPTION DETAILS: INTERMITTENT ERUPTIONS. . DETAILS OF ASH: SURFACE AND AIRCRAFT OBSERVATIONS FROM QUITO REPORT VOLCANIC ASH OVER THE VOLCANO AT FL230. SATELLIE IMAGERY THROUGH 1615 UTC SHOWS EXTENSIVE CLOUDINESS OVER AND NEAR THE SUMMIT MAKING DETECTION OF ASH EXTREMELY DIFFICULT. . TRAJECTORY: ANY ASH REMAINING AT FL230 WOULD CONTINUE TO MOVE TOWARD THE WEST AT 15-20 KTS. . OUTLOOK: SEE SIGMETS AND VAFTAD. . NEXT MESSAGE WILL BE ISSUED BY 04/2300 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. . KARST . NNNN