FVXX20 KNES 031918
VOLCANIC ASH ADVISORY
ISSUED: 2005AUG03/1918Z   VAAC: WASHINGTON

VOLCANO: ANATAHAN 0804-20
LOCATION: N1621E14540   AREA: MARIANA.ISLANDS

SUMMIT ELEVATION: 2585 FT (788 M)

ADVISORY NUMBER: 2005/628

INFORMATION SOURCE: GUAM WFO. GFS MODEL WINDS.
METAR. GOES-9. USGS. AFWA

ERUPTION DETAILS: ONGOING ASH EMISSIONS	

OBS ASH DATE/TIME: 03/1825Z

OBS ASH CLOUD: SFC/FL300 N1625E14547 - N1547E14555
- N1520E14538 - N1542E14525 - N1607E14538 -
N1625E14538 - N1625E14547 MOVING S 5-15 KNOTS. 

FCST ASH CLOUD +6H: 04/0030Z SFC/FL250 N1701E14604
- N1630E14627 - N1434E14505 - N1629E14431 -
N1637E14534 - N1701E14604 SFC/FL120 N1547E14442 -
N1432E14506 - N1332E14418 - N1420E14356 -
N1547E14442 

FCST ASH CLOUD +12H: 04/0630Z SFC/FL220
N1756E14532 - N1647E14621 - N1510E14504 -
N1722E14411 - N1756E14532 

FCST ASH CLOUD +18H: 04/1230Z SFC/FL220
N1816E14603 - N1609E14601 - N1610E14501 -
N1811E14428 - N1816E14603 

REMARKS: CONVECTIVELY UNSTABLE ENVIRONMENT LEADING
TO THUNDERSTORMS AND CIRRUS BLOWOFF THROUGHOUT THE
ISLAND CHAIN... MAKING ASH DETECTION
DIFFICULT...AND IMPOSSIBLE BELOW FL150.  USGS
REPORTS SEISMIC ACTIVITY AS BECOME STEADY LEVELING
OFF TO CONDITIONS PRIOR TO THE 0900Z ERUPTION. 
MULTISPECTRAL IMAGERY HINTS AT THUNDERSTORMS WITH
ASH CONTENT CONTINUE S TO NEAR SAIPAN ATTM AND SFC
REPORTS AT PGUM STILL INDICATE THAT LOW LEVEL ASH
CONTINUES TO FALL THERE...EVEN THOUGH IT IS NOT
DETECTABLE.   ...GALLINA

NEXT ADVISORY: WILL BE ISSUED BY 2005AUG04/0115Z

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