FVXX21 KWBC 071630 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1620 UTC 07 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-537 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. 12 HOUR WINDS FORECAST FROM THE 06 UTC AVIATION MODEL. GUAYAQUIL METEOROLOGICAL WATCH OFFICE SIGMET . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 07/1545 UTC SHOWS WEATHER CLOUDS OVER THE AREA MAKING DETECTION OF ASH DIFFICULT. A GUAYAQUIL MWO SIGMET INDICATES THAT AT 07/1225 UTC THE INSTITUTO GEOFISICO REPORTED A PROBABLE VOLCANIC ASH CLOUD OVER THE VOLCANO AND MOVING WESTWARD. WE HAVE NO HEIGHT INFORMATION FOR THIS ASH. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL25O WOULD MOVE TOWARD THE WEST AT 10 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 07/2230 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. . NNNN