FVXX21 KWBC 041800 . VOLCANIC ASH ADVISORY STATEMENT-WATCH ISSUED 1800 UTC 4 JUNE 1999 BY THE WASHINGTON VAAC . FUEGO 99-012 GUATEMALA 14.47N 90.88W . BACKGROUND: FUEGO GUATEMALA (1402-09) SUMMIT HEIGHT 12345 FT (3763 M) . VOLCANOLOGISTS IN GUATEMALA INDICATE THAT THE VOLCANO REMAINS RESTLESS WITH UNDERGROUND SEISMIC ACTIVITY CONTINUING TO OCCUR. WE WILL CONTINUE TO MONITOR THE AREA AND IF THERE IS AN ASH CLOUD OBSERVED OR REPORTED A VOLCANIC ASH ADVISORY STATEMENT WILL BE ISSUED AS SOON AS POSSIBLE. . THE WATCH VAAS IS ISSUED ONLY FOR 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. NON-EXPLOSIVE LOW LEVEL AND NEAR SUMMIT ACTIVITY MAY BE OCCURRING AT PRESENT. SEE NOAA-ARL HOMEPAGE FOR HYPOTHETICAL ERUPTIONS-VAFTAD AT: HTTP://WWW.ARL.NOAA.GOV/VAFTAD.HTML (ALL LOWER CASE) . . THE NEXT WATCH STATEMENT WILL BE ISSUED AROUND 05/1800 UTC. . . NNNN