FVXX22 KNES 201800
VOLCANIC ASH ADVISORY
ISSUED: 2006APR20/1800Z VAAC: WASHINGTON
VOLCANO: SOUFRIERE HILLS 1600-05
LOCATION: N1642 W06210 AREA: W_INDIES
SUMMIT ELEVATION: 3002 FT (915 M)
ADVISORY NUMBER: 2006/257
INFORMATION SOURCE: GOES-12. GFS WINDS.
ERUPTION DETAILS: ONGOING ASH/STEAM/GAS EMISSIONS
OBS ASH DATE/TIME: 20/1732Z
OBS ASH CLOUD: SFC/FL050 N1707 W06226 - N1646
W06210 - N1642 W06211 - N1656 W06238 - N1707
W06226 MOVING NW 0-5 KNOTS. SFC/FL100 N1705 W06121
- N1642 W06143 - N1643 W06211 - N1646 W06210 -
N1705 W06121 MOVING NW 5-10 KNOTS.
FCST ASH CLOUD +6H: 20/2330Z SFC/FL100 N1727
W06226 - N1704 W06137 - N1643 W06210 - N1652
W06253 - N1727 W06226
FCST ASH CLOUD +12H: 21/0530Z SFC/FL120 N1724
W06214 - N1643 W06207 - N1641 W06211 - N1653
W06259 - N1724 W06214
FCST ASH CLOUD +18H: 21/1130Z SFC/FL100 N1728
W06223 - N1644 W06207 - N1641 W06211 - N1655
W06309 - N1728 W06223
REMARKS: TWO PLUMES CONTINUE TO BE OBSERVED IN
SATELLITE IMAGERY. A LOW LEVEL PLUME WITH MAX
HEIGHT OF FL050 IS MOVING NW UNDER LIGHT FLOW.
THE SECOND PLUME EXTENDS TO THE EAST OF THE
VOLCANO BUT WINDS HAVE SHIFTED OVER THE LAST 3
HOURS...SO ASH IS NOW STARTING TO MOVE NW AS WELL.
BY THE END OF THE FORECAST PERIOD THE 2 AREAS
SHOULD BE LOCATED TOWARD THE NW OF THE VOLCANO AS
WINDS BECOME MORE UNIFORM ALOFT. ...GALLINA
NEXT ADVISORY: WILL BE ISSUED BY 2006APR21/0000Z
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