FVXX22 KNES 201157
VOLCANIC ASH ADVISORY
ISSUED: 2006APR20/1157Z   VAAC: WASHINGTON

VOLCANO: SOUFRIERE HILLS 1600-05
LOCATION: N1642 W06210   AREA: W_INDIES

SUMMIT ELEVATION: 3002 FT (915 M)

ADVISORY NUMBER: 2006/256

INFORMATION SOURCE: GOES-12. GFS WINDS. MONTSERRAT
OBSERVATORY. 

ERUPTION DETAILS: ONGOING GAS/STEAM EMISSIONS WITH
LIGHT ASH FALL

OBS ASH DATE/TIME: 20/1132Z

OBS ASH CLOUD: SFC/FL050 N1655 W06208 - N1642
W06211 - N1653 W06225 - N1655 W06208 MOVING NW 0-5
KNOTS. SFC/FL120 N1655 W06208 - N1653 W06132 -
N1641 W06146 - N1642 W06210 - N1655 W06208 MOVING
NE 0-5 KNOTS. 

FCST ASH CLOUD +6H: 20/1730Z SFC/FL050 N1705
W06207 - N1642 W06211 - N1656 W06239 - N1705
W06207 SFC/FL120 N1707 W06117 - N1642 W06136 -
N1641 W06208 - N1643 W06211 - N1705 W06208 - N1707
W06117 

FCST ASH CLOUD +12H: 20/2330Z SFC/FL100 N1716
W06236 - N1646 W06210 - N1641 W06212 - N1641
W06210 - N1648 W06252 - N1716 W06236 

FCST ASH CLOUD +18H: 21/0530Z SFC/FL100 N1714
W06250 - N1646 W06210 - N1642 W06211 - N1642
W06256 - N1714 W06250 

REMARKS: VERY LIGHT WINDS AT THE VOLCANO ARE
LETTING THE GAS/STEAM PLUME TO RISE TO THE
INVERSION WHICH IS ABOUT FL120 WITH LIGHT ASH FALL
ACROSS THE ISLAND BEING REPORTED BY THE MVO.   THE
LIGHT WINDS ARE LETTING ASH BELOW THE OROGRAPHY TO
MOVE NW...WHILE ABOVE LIGHT WESTERLIES ARE MOVING
ASH TOWARD THE NE AND E ATTM.  GFS SOUNDINGS SHOW
CONTINUED LIGHT WINDS AND A SLOW ERROSION OF THE
INVERSION SO BY THE 12HR FORECAST THE NEWARD
MOVING  ASH SHOULD DISSIPATE AND THE PLUME SHOULD
CONSOLIDATE AND MOVE NW TO W. ...GALLINA

NEXT ADVISORY: WILL BE ISSUED BY 2006APR20/1800Z

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