FVXX22 KWBC 091238 VOLCANIC ASH ADVISORY ISSUED: 2003JUL09/1300Z VAAC: WASHINGTON VOLCANO: ANATAHAN 0804-20 LOCATION: N1621E14540 AREA: MARIANA ISLANDS SUMMIT ELEVATION: 2585 FT (788 M) ADVISORY NUMBER: 2003/247 INFORMATION SOURCE: GOES 9 IMAGERY. GFS MODEL WINDS FORECAST ERUPTION DETAILS: ASH AND GAS EMISSIONS SINCE MAY 10. OBS ASH DATE/TIME: 09/1202Z. OBS ASH CLOUD: ASH NOT IDENTIFIABLE FROM SATELLITE DATA. WINDS SFC/FL080 MOVING SW 10-15 KNOTS. FCST ASH CLOUD +6H: SEE SIGMETS. REMARKS: DUE TO THE LOW SUN ANGLE ON THE LAST VISIBLE IMAGES OF THE DAY...A LONG THIN AREA OF STEAM AND ASH COULD BE SEEN...SEE MESSAGE 2003/246. HOWEVER...NIGHT TIME DETECTION OF ASH AT SUCH A LOW LEVEL IS VERY DIFFICULT AND HENCE CANNOT BE DETECTED AT THIS TIME. WILL NOT SPECULATE EXACTLY WHERE THE VERY DIFFUSE PLUME IS EXCEPT THAT WINDS IN THE AREA OF THE SUMMIT WOULD BE MOVING THE ASH TO THE SSW AT 10-15 KNOTS. WILL CONTINUE TO MONITOR FOR FURTHER DETECTION OF ASH ASSOCIATED WITH THE WEAK STEAMING AND DEGASSING FROM ANATAHAN....GALLINA NEXT ADVISORY: WILL BE ISSUED BY 2003JUL09/1900Z. NNNN