FVXX21 KWBC 310630 VOLCANIC ASH ADVISORY STATEMENT ISSUED 0630 UTC 31 JAN 2000 BY THE WASHINGTON VAAC . TUNGURAHUA 00-124 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...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 31/0545 UTC. HOWEVER THE EXTENSIVE WEATHER CLOUDS AROUND THE VOLCANO COULD BE HINDERING THE DETECTION OF ASH. DURING MUCH OF THE AFTERNOON OF JANUARY 30 THE GEOPHYSICAL INSTITUTE OBSERVED STEAM AND ASH TO FL200 MOVING TOWARD THE WEST OR NORTHWEST AND THEY ALSO NOTED A PILOT REPORT OF POSSIBLE ASH TO FL350. . TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH BETWEEN THE SUMMIT AND FL350 WILL MOVE TOWARDS THE WEST OR WEST NORTHWEST. ANY ASH BETWEEN THE SUMMIT AND FL310 WOULD MOVE AT 8 TO 20 KNOTS AND ANY ASH AT FL350 WOULD MOVE AT ABOUT 25 KNOTS. . OUTLOOK: SEE SIGMETS . THE NEXT STATEMENT WILL BE ISSUED BY 31/1230 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