FVXX21 KWBC 311200 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1200 UTC 31 JAN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-125 ECUADOR 0128S 7826W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: JANUARY 30 GEOPHYSICAL INSTITUTE REPORT...GOES-8 INFRARED AND MULTISPECTRAL SATELLITE IMAGERY...30/1200 UTC AVIATION MODEL WIND FORECAST. . ERUPTION DETAILS: INTERMITTENT EXPLOSIONS PRODUCING STEAM AND ASH. . DETAILS OF ASH: NO ASH CAN BE SEEN IN SATELLITE IMAGERY THROUGH 31/1115 UTC POSSIBLY DUE TO THE EXTENSIVE WEATHER CLOUDS IN THE AREA. THE GEOPHYSICAL INSTITUTE REPORT FROM JANUARY 30 INDICATED AN ASH AND STEAM COLUMN TO FL200 AND A PILOT REPORT OF HIGHER ASH. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL310 WOULD MOVE TOWARD THE WEST OR WEST NORTHWEST AT 10 TO 15 KNOTS. ANY ASH AT ABOUT FL350 WOULD MOVE TOWARD THE WEST AT ABOUT 25 KNOTS. . OUTLOOK: SEE SIGMETS . THE NEXT STATEMENT WILL BE ISSUED BY 31/1800 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