FVXX20 KWBC 121434 VOLCANIC ASH ADVISORY ISSUE: 2003JUL12/1430Z VAAC: WASHINGTON VOLCANO: SOUFRIERE HILLS 1600-05 LOCATION: N1643W06211 AREA: CARIBBEAN SUMMIT ELEVATION: 3000 FT (915 M) ADVISORY NUMBER: 2003/574 INFORMATION SOURCE: GOES-12 IMAGERY. MONTSERRAT VOLCANO OBSERVATORY. 1200Z GUADELOUPE UPPER AIR SOUNDING ERUPTION DETAILS: PYROCLASTIC FLOWS PRODUCING ASH OBS ASH DATE/TIME: 12/1415Z OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL080 MOVING WEST AT 25 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: THE MONTSERRAT VOLCANO OBSERVATORY REPORTS HEAVY ASH AT FL080 MOVING WEST BEING PRODUCED BY PYROCLASTIC FLOWS. THICK METEOROLOGICAL CLOUDS IN THE AREA OF THE VOLCANO OBSCURES THE ASH. NEXT ADVISORY: WILL BE ISSUED BY 2003JUL12/2030Z. NNNN