FVXX20 KWBC 251400 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1400 UTC 25 SEPTEMBER 1999 BY THE WASHINGTON VAAC . SANTA MARIA 99-001 GUATEMALA 14.76N 91.65W . BACKGROUND: SANTA MARIA (1402-03) SUMMIT HEIGHT 12375FT (3772 M) . SOURCES OF INFORMATION: SURFACE REPORT FROM RETALHULEU. GOES-8 VISIBLE...INFRARED...AND MULTISPECTRAL IMAGERY. ERUPTION DETAILS: 25/1300Z SURFACE OBSERVATION FROM STATION MGRT INDICATE THAT THE SANTIAGUITO AREA (SW FLANK OF SANTA MARIA) IS ERUPTING. BEGINNING TIME IS UNKNOWN. . DETAILS OF ASH CLOUD: ASH CAN NOT BE SEEN IN GOES IMAGERY DUE TO BROKEN CUMILONIMBUS IN THE REGION. IT IS BELIEVED TO BE A LOW LEVEL ERUPTON BELOW FL150. . TRAJECTORY: SURFACE OBS AND CLOSEST RAOB IN BELIZE SHOW WINDS BELOW FL150 TO BE MOVING SOUTHWEST AT 5 TO 10 KNOTS. . HUGHES . REAL TIME SATELLITE IMAGERY ALONG WITH 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/washington.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 25/2000Z UNLESS NEW INFORMATION IS RECEIVED. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN