FVXX20 KWBC 070310 VOLCANIC ASH ADVISORY ISSUED: 2003OCT07/0330Z VAAC: WASHINGTON VOLCANO: TUNGURAHUA 1502-08 LOCATION: S0128W07826 AREA: ECUADOR SUMMIT ELEVATION: 16480 FT (5023 M) ADVISORY NUMBER: 2003/333 INFORMATION SOURCE: GOES-12 IMAGERY. GFS MODEL WINDS FORECAST. GUAYAQUIL MWO SIGMET. ERUPTION DETAILS: SERIES OF EMISSIONS STARTING AT 21/2345Z OBS ASH DATE/TIME: 07/0245Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS FL100/270 MOVING N 5-10 KNOTS. FCST ASH CLOUD+6H: SEE SIGMETS. REMARKS: THE MOST RECENT KNOWN ASH OBSERVATION WAS AT 2255Z WHEN A PILOT OBSERVED ASH TO FL270. SUBSTANTIAL UNCERTAINTY EXISTS TODAY CONCERNING THE WIND DIRECTION SINCE MODEL WIND FORECASTS SUGGEST A WESTERLY OR NORTHWESTERLY DIRECTION BUT EARLIER SATELLITE ASH OBSERVATIONS SUGGEST ASH IS MOVING TOWARD THE NORTH. NO ASH OR HOTSPOTS CAN BE SEEN IN CURRENT SATELLITE IMAGERY BUT LOW AND MID-LEVEL CLOUDS COULD BE PREVENTING ASH AND HOTSPOT DETECTION. NEXT ADVISORY: WILL BE ISSUED BY 2003OCT07/0930Z. NNNN