FVXX21 KWBC 270500 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0500 UTC 27 MAY 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-618 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 SIGMETS..UPPER AIR WIND FORECAST FROM THE AVIATION MODEL. . ERUPTION DETAILS: OCCASIONAL GAS AND ASH EMISSIONS. . DETAILS OF ASH: EXTENSIVE LOW AND MID LEVEL CLOUDS MAKE IT DIFFICULT TO DETECT ANY ASH OR STEAM IN THE AREA AROUND THE VOLCANO. THE LATEST OBSERVATION AT 26/2000 UTC FROM RIOBAMBA INDICATES VOLCANIC ASH OVER THE VOLCANO MOVING WEST. . TRAJECTORY: UPPER AIR WIND PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL250 WOULD MOVE TO THE WEST AT 15 TO 20 KNOTS. . OUTLOOK: SEE SIGMETS. . THE NEXT STATEMENT WILL BE ISSUED BY 27/1100 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