FVXX21 KWBC 071255 . VOLCANIC ASH ADVISORY STATEMENT ISSUED 1255 UTC 07 JULY 1999 BY THE WASHINGTON VAAC . POPOCATEPETL 99-081 MEXICO 19.02N 98.62W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: MEXICO CITY MWO..NUMERICAL PREDICTION FORECAST MODEL FROM 0000 UTC..GOES 8 IMAGERY..CENEPRED REMOTE CAMERA. . ERUPTION DETAILS: REPORTED ERUPTION 07/1210 UTC TO FL200. . DETAILS OF ASH CLOUD: MEXICO CITY MWO REPORTS A MINOR ERUPTION OF THE POPOCATEPETL VOLCANO TO FL200 POSSIBLY CONTAINING ASH. A PILOT REPORT MENTIONED AN ERUPTION AND THE CENAPRED REMOTE CAMERA CONFIRMS A PLUME EMANATING FROM THE SUMMIT..ALTHOUGH IT APPEARS TO MAINLY BE A STEAM EMISSION. NO PLUME IS VISIBLE ON GOES8 IMAGERY AT THIS TIME. . TRAJECTORY: THE 07/0000 UTC MEXICO CITY UPPER AIR SOUNDING AND THE 12 HOUR FORECAST FROM THE 0000 UTC AVIATION NUMERICAL WEATHER PREDICTION MODEL SUGGEST ANY ASH AT FL200 WOULD MOVE TOWARD THE WEST SOUTHWEST AT ABOUT 10 KNOTS. . 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 LATEST SIGMETS. . THE NEXT MESSAGE WILL BE ISSUED BY 1900 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . NNNN