FVXX21 KNES 230415 VA ADVISORY DTG: 20071223/0413Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 PSN: S0128 W07826 AREA: ECUADOR SUMMIT ELEV: 16480 FT (5023 M) ADVISORY NR: 2007/936 INFO SOURCE: GOES-12. GFS WINDS. GEOPHYSICAL INST. SIGMET ERUPTION DETAILS: ONGOING EMISSIONS OBS VA DTG: 23/0345Z OBS VA CLD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/240 MOVING FROM E 5-20 KNOTS. FCST VA CLD +6HR: 23/1000Z FCST VA CLD +12HR: 23/1600Z FCST VA CLD +18HR: 23/2200Z RMK: GEOPHYSICAL INST REPORTS AND SEISMIC DATA CONTINUE TO INDICATE POTENTIAL HEIGHTENED ACTIVITY. NO ASH OR HOTSPOTS CAN BE SEEN IN IMAGERY BUT LOW LEVEL WEATHER CLOUDS COULD BE HINDERING ASH DETECTION. A SIGMET CITES A 2140Z PILOT REPORT OF FL230 ASH MOV W. NXT ADVISORY: WILL BE ISSUED BY 20071223/1015Z NNNN