FVXX21 KWBC 311800 . VOLCANIC ASH ADVISORY STATEMENT-WATCH ISSUED 1800 UTC 31 JULY 1999 BY THE WASHINGTON VAAC . FUEGO 99-036 GUATEMALA 14.47N 90.88W . BACKGROUND: FUEGO GUATEMALA (1402-09) SUMMIT HEIGHT 12345 FT (3763 M) . THE INSTITUTO NACIONAL DE SISMOLOGIA VULCANOLOGIA METEOROLOGIA E HIDROLOGIA IN GUATEMALA CITY REPORTS THAT THE VOLCANO REMAINS UNSETTLED AT THIS TIME. AN INTERMITTENT HOT SPOT HAD BEEN OBSERVED IN NEAR-INFRARED SATELLITE IMAGERY DURING THE NIGHT. . 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. SATELLITE IMAGERY OF FUEGO CAN BE ACCESSED VIA INTERNET AT: HTTP://WWW.SSD.NOAA.GOV/VAAC/FUEG_IMG.HTML (ALL LOWER CASE EXCEPT VAAC) . 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 MESSAGE WILL BE ISSUED AROUND 01/1800 UTC. . NNNN