FVXX21 KWBC 261915 . VOLCANIC ASH ADVISORY STATEMENT-WATCH ISSUED 1915 UTC 26 May 1999 BY THE WASHINGTON VAAC . FUEGO 99-003 GUATEMALA 14.47N 90.88W . BACKGROUND: FUEGO GUATEMALA (1402-09) SUMMIT HEIGHT 12345 FT (3763 M) . THE VOLCANO REMAINS UNSTABLE AND CAUTION IS ADVISED. THE LEVEL OF CONCERN IS YELLOW. . THE WATCH VAAS IS ISSUED FOR ONLY SEISMICALLY MONITORED VOLCANOES AND BASED ON INFORMATION RECEIVED FROM THE GEOLOGICAL COMMUNITY. A WATCH VAAS WILL BE ISSUED DAILY WHEN INFORMATION IS RECEIVED TO INDICATE THAT A VOLCANO IS RESTLESS AND HAS THE POTENTIAL FOR AN EXPLOSIVE ERUPTION WITH LITTLE OR NO WARNING. SEE NOAA-ARL HOMEPAGE FOR A TEST VAFTAD AT HTTP://WWW.ARL.NOAA.GOV/VAFTAD.HTML (ALL LOWER CASE) . . THE NEXT WATCH STATEMENT WILL BE ISSUED AT 27/1800 UTC. . . NNNN