FVXX20 KWBC 251630 . VOLCANIC ASH ADVISORY STATEMENT-WATCH ISSUED 1630 UTC 25 FEB 1999 BY THE WASHINGTON VAAC . COLIMA 99-020 MEXICO 19.51N 103.62W . BACKGROUND: COLIMA MEXICO (1401-04) SUMMIT HEIGHT 13451 FT (4100 M) THE COLIMA CENTER OF ENVIRONMENTAL RESEARCH REPORTS THAT THE VOLCANO REMAINS UNSTABLE WITH THE POTENTIAL TO PRODUCE AN ERUPTION CLOUD WITH LITTLE OR NO WARNING. . WE WILL CONTINUE TO MONITOR THE AREA AND IF THERE IS AN ASH CLOUD OBSERVED OR REPORTED AT ANY ALTITUDE A VOLCANIC ASH ADVISORY STATEMENT WARNING 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 TEST-VAFTAD AT: HTTP://WWW.ARL.NOAA.GOV/VAFTAD.HTML (ALL LOWER CASE) . THE NEXT WATCH STATEMENT WILL BE ISSUED AROUND 26/1600 UTC. . NNNN