FVXX21 KWBC 011330 VOLCANIC ASH ADVISORY ISSUED 1330 UTC 01 AUG 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-898 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE...INFRARED AND MULTISPECTRAL IMAGERY. THE GEOPHYSICAL INSTITUTE IN QUITO. 01/1200 UTC FORECAST UPPER WINDS FROM THE 01/0000 UTC AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL EMISSIONS OF ASH AND STEAM. . DETAILS OF ASH: GOES-8 IMAGERY THROUGH 1315 UTC SHOWS A LARGE AREA OF DENSE OVERCAST CLOUDS OBSCURING THE VIEW OF THE VOLCANO. THE GEOPHYSICAL INSTITUTE IN QUITO REPORTS THAT THERE WERE SEVERAL MODERATE EXPLOSIONS YESTERDAY (31 JULY) BUT NOTHING SINCE THEN. THE VOLCANO REMAINS IN A VERY ACTIVE STATE AND COULD PRODUCE ASH AT ANYTIME. . TRAJECTORY: UPPER AIR SYNOPTIC PATTERNS SUGGEST ANY ASH UP TO FL250 WOULD MOVE WEST AT 10 KNOTS. HOWEVER LOCALIZED MESOSCALE EFFECTS FROM OUTFLOW BOUNDARIES ASSOCIATED WITH HEAVY RAINFALL MAY CAUSE ASH TO MOVE IN OTHER DIRECTIONS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 01/1930 UTC. . REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH ADVISORIES 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. . HUGHES . NNNN