FVXX20 KWBC 011435 . VOLCANIC ASH ADVISORY STATEMENT--CORRECTED FOR TIME OF NEXT ISSUANCE ISSUED 1435 UTC 01 APR 1999 BY THE WASHINGTON VAAC . SOUFRIERE HILLS 99-079 WEST INDIES 16.72N 62.18W . BACKGROUND: SOUFRIERE HILLS MONTSERRAT (1600-05) SUMMIT HEIGHT 3000 FT (915 M) . SOURCES OF INFORMATION: MONTSERRAT VOLCANO OBSERVATORY. 1200 UTC GUADELOUPE RADIOSONDE. GOES-8 VISIBLE SATELLITE IMAGERY. . ERUPTION DETAILS: ERUPTION AT ABOUT 0445 UTC . DETAILS OF ASH CLOUD: VISIBLE IMAGERY SUGGESTED A POSSIBLE ASH CLOUD OVER THE EASTERN CARIBBEAN. AT 1332 UTC THE CLOUD WAS LOCATED WITHIN 25 KM (13 NMI) EITHER SIDE OF A LINE EXTENDING FROM 16.4N/62.9W TO 16.5/63.9W TO 16.0N/64.7W TO 16.3N/65.1W. THE HEIGHT OF THIS ASH CLOUD WAS ESTIMATED AT FL050. WHILE NO ASH COULD BE DISCERNED FROM VISIBLE OR MULTISPECTRAL IMAGERY EAST OF CARIBBEAN IT IS POSSIBLE THAT DIFFUSE ASH MAY EXIST OVER THE SOUTH CENTRAL ATLANTIC ESPECIALLY IF THE MAXIMUM HEIGHT OF THE ERUPTING COLUMN EXCEEDED FL100 AS WAS ORIGINALLY SUGGESTED BY THE MONTSERRAT VOLCANO OBSERVATORY. CAUTION IS ADVISED IN THESE AREAS. . TRAJECTORY: TOWARD THE WEST AT 15 TO 20 KTS AT FL050. ANY ASH AT FL100 WOULD MOVE SOUTHEAST AT 10 KTS. ASH BETWEEN FL200 AND FL310 WOULD MOVE EAST BETWEEN 25 AND 50 KTS. . THIS AND OTHER VOLCANIC ASH ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS www.ssd.noaa.gov/VAAC/messages.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 01/2030 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN