FVXX21 KWBC 201400 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1400 UTC 20 OCTOBER 1999 BY THE WASHINGTON VAAC . TUNGURAHUA 99-009 ECUADOR 1.47S 78.44W . BACKGROUND: TUNGURAHUA ECUADOR (1502-08) SUMMIT HEIGHT 16480 FT (5023 M) . SOURCES OF INFORMATION: USGS PERSONNEL AT THE GEOPHYSICAL ISTITUTE IN QUITO...GOES-8 VISIBLE...INFRARED..AND MULTISPECTRAL IMAGERY. GUYAQUIL METEOROLOGICAL WATCH OFFICE. U.S. NATIONAL WEATHER SERVICE NUMERICAL WEATHER PREDICTION MODELS. . ERUPTION DETAILS: PERIODIC MINIMAL TO MODERATE ERUPTIONS. . DETAILS OF ASH: NO ASH CAN BE SEEN ON CURRENT GOES-8 SATELLITE IMAGERY DUE TO ABUNDANT LOW TO MID LEVEL CLOUDS IN THE AREA. THE USGS AT QUITO REPORTS THAT TUNGURAHUA IS STILL IN AN ACTIVE SEISMIC STATE...WITH PERIODIC MINIMAL TO MODERATE ERUPTIONS OF ASH. TUNGURAHUA WAS REPORTED TO BE QUIET OVERNIGHT...BUT SIESMIC ACTIVITY PICKED UP THIS MORNING. GUYAQUIL MWO HAS RECEIVED CURRENT REPORTS OF ASH TO FL230. . TRAJECTORY: NUMERICAL MODEL FORECASTS SUGGEST ANY ASH AT THE SUMMIT UP TO A LEVEL OF FL300 WOULD MOVE SOUTHWEST AT 8 TO 12 KNOTS. . 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/) . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 20/2000 UTC. . HUGHES/NOAA/NESDIS/SAB . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN