FVXX21 KWBC 031730 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1730 UTC 03 APR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-057 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES8 VISIBLE INFRARED AND MULTISPECTRAL IMAGERY. MEXICO CITY MWO. CENAPRED REPORT AND POPO CAMERA. . ERUPTION DETAILS: GASES ERUPTED AROUND 1555 UTC. . DETAILS OF ASH CLOUD: THE MEXICO CITY MWO HAS ISSUED A SIGMET FOR ACTIVITY AT THE VOLCANO. NO ASH OR PLUMES CAN BE SEEN IN HIGH RESOLUTION SATELLITE IMAGERY OVER THE REGION. UPON FURTHER INVESTIGATION IT HAS BEEN DETERMINED THAT THE ACTIVITY IS VERY NEAR SUMMIT GAS EMISSIONS THAT MAY CONTAIN A LITTLE LIGHT ASH. . TRAJECTORY: N/A . 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/messages.html (all lower case except /VAAC/) . OUTLOOK: SEE SIGMETS. . THIS WILL BE THE ONLY STATEMENT FOR THIS EVENT UNLESS ASH IS DETECTED OR REPORTED. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN