FVXX21 KWBC 200130 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 0130 UTC 20 MAR 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-037 MEXICO 19.02N 98.62W MESSAGE NUMBER HAS BEEN CHANGED DUE TO A PREVIOUS ERROR IN NUMBERING . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY. CENAPRED AND MEXICO CITY METEOROLOGICAL WATCH OFFICE. . ERUPTION DETAILS: CENAPRED REPORTS AN EXHALATION AT 20/0041 UTC. . DETAILS OF ASH CLOUD: CENAPRED REPORTS AN EXHALATION TO FL400. DENSE METEOROLOGICAL CLOUDS COVER THE VOLCANO SO ANY ASH DETECTION IS DIFFICULT AT THIS TIME. ACCORDING TO THE METEOROLOGICAL WATCH OFFICE WINDS AT 30,000 FT ARE FROM 250/30 KTS. . TRAJECTORY: ASH FROM FL180 TO FL400 WOULD MOVE TOWARDS THE EAST NORTHEAST AT 30 TO 40 KTS. . 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. . THE NEXT MESSAGE WILL BE AT 20/0730 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN