FVXX21 KNES 271630 VA ADVISORY DTG: 20071127/1624Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 PSN: S0128 W07826 AREA: ECUADOR SUMMIT ELEV: 16480 FT (5023 M) ADVISORY NR: 2007/831 INFO SOURCE: GOES-12. GFS WINDS. SIGMET CITING PILOT REPORT ERUPTION DETAILS: ONGOING EMISSIONS OF ASH AND STEAM OBS VA DTG: 27/1545Z OBS VA CLD: SFC/FL280 8NM WIDE LINE BETWEEN S0132 W07853 - S0128 W07826. ASH IS MOVING W 10 KNOTS. FCST VA CLD +6HR: 27/2200Z SFC/FL280 8NM WIDE LINE BETWEEN S0128 W07853 - S0129 W07825. FCST VA CLD +12HR: 28/0400Z SFC/FL280 8NM WIDE LINE BETWEEN S0132 W07853 - S0130 W07826. FCST VA CLD +18HR: 28/1000Z SFC/FL280 8NM WIDE LINE BETWEEN S0135 W07853 - S0129 W07826. RMK: A SIGMET CITES A PILOT REPORT OF ASH FL260/280. SAT IMAGERY SHOWS A FAINT ASH PLUME EXTENDING FROM VOLCANO TOWARD WEST. A HOTSPOT IS ALSO SEEN. HIGH FCST UNCERTAINTY DUE TO LARGE VERTICAL WIND SHEAR AT AND ABV RPTD ASH LEVEL. NXT ADVISORY: WILL BE ISSUED BY 20071127/2230Z NNNN