FVXX20 KWBC 171215 CCA
VOLCANIC ASH ADVISORY
ISSUED: 2002DEC16/1215Z  VAAC: WASHINGTON

CORRECTION FOR FLIGHT LEVEL OF LOWER LEVEL PLUME
 
VOLCANO: SOUFRIERE HILLS   1600-05
LOCATION: N1643W06211    AREA: CARIBBEAN

SUMMIT ELEVATION: 3000 FT (915M)

ADVISORY NUMBER: 2002/225
 
INFORMATION SOURCE: GOES-8 IMAGERY. MONTSERRAT VOLCANO
OBSERVATORY. GFS MODEL WINDS FORECAST. MONTSERRAT VOLCANO CAMERA.
MONTSERRAT HELIPAD WEATHER OBSERVERS. 

ERUPTION DETAILS: WEAK ASH EMISSIONS.
 
OBS ASH DATE/TIME: 17/1145Z.

OBS ASH CLOUD: SFC/FL070 10 NM WIDE LINE OF ASH EXTENDING BETWEEN
N1643W06211 N1651W06244 MOVING NW AT 5 KNOTS. FL055/FL110 8 NM
WIDE LINE OF ASH EXTENDING BETWEEN N1643W06211 N1635W06142 MOVING
NE AT 10-15 KNOTS.
 
FCST ASH CLOUD +6H: SEE SIGMETS.
 
REMARKS: THE MONTSERRAT VOLCANO OBSERVATORY HAS INDICATED THAT
WEAK ROCKFALLS AND PYROCLASTIC FLOWS HAVE OCCURRED ON A REGULAR
BASIS...ABOUT 1 OR 2 PER HOUR...SENDING WEAK PULSES OF ASH INTO
THE AIR. DUE TO WEAK FLOW ASH HAS BEEN ABLE TO RISE TO FL110.
THERE IS A CHANGE IN WIND DIRECTION BETWEEN THE SUMMIT AND
FL110...SO THERE ARE 2 PLUMES MOVING NW AND NE. THESE PLUMES ARE
SEEN ON SATELLITE IMAGERY AND CONFIRMED BY LOCAL HELIPAD WEATHER
OBSERVERS WHOM HAVE ESTIMATED THE HEIGHT OF THE NW PLUME AT FL070
AND THE NE PLUME TO FL110. 

NEXT ADVISORY: WILL BE ISSUED BY 2002DEC17/1830Z.

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"Attached Graphic Map Depicting Ash Only" 

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