FVXX21 KWBC 280500 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0500 UTC 28 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-622 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY...GUAYAQUIL METEOROLOGICAL WATCH OFFICE..UPPER AIR WIND FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: SATELLITE IMAGERY THROUGH 28/0415 UTC SHOWS EXTENSIVE LOW AND MID LEVEL CLOUDS IN THE AREA AROUND THE VOLCANO MAKING IT DIFFICULT TO DETECT ANY VOLCANIC ASH. THE VOLCANO REMAINS UNSTABLE AND AN ERUPTION OF ASH AND STEAM CAN OCCUR AT ANY TIME. . TRAJECTORY: UPPER AIR WIND PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TO THE WEST AT UP TO 25 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 28/1100 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