FVXX22 KWBC 131055 VOLCANIC ASH ADVISORY STATEMENT ISSUED 1055 UTC 13 JAN 2000 BY THE WASHINGTON VAAC . POPOCATEPETL 00-003 MEXICO 1901N 9837W . BACKGROUND: POPOCATEPETL MEXICO (1401-09) SUMMIT HEIGHT 17930 FT (5465 M) . SOURCES OF INFORMATION: GOES 8 INFRARED AND MULTISPECTRAL IMAGERY...MEXICO CITY MWO...13/0000 UTC AVIATION MODEL SOUNDING DATA...0000 UTC MEXICO CITY UPPER-AIR SOUNDING...MEXICO CITY SURFACE OBSERVATIONS... . ERUPTION DETAILS: MAIN ERUPTION AT 13/0303 UTC... . DETAILS OF ASH CLOUD: GOES-8 INFRARED AND MULTISPECTRAL SATELLITE IMAGERY THROUGH 13/1025 UTC DOES NOT INDICATE ANY WELL DEFINED AREAS OF ASH AND STEAM. THE ASH CLOUD THAT WAS EVIDENT EARLIER IN THE NIGHT HAS GRADUALLY FADED TO THE EXTENT THAT IT IS NOT DETECTABLE IN ANY CURRENT IMAGERY. HOWEVER THERE ARE SEVERAL FEATURES OF NOTE... . MEXICO CITY HAS REPORTED ASH TO THE EAST OF THE CITY FOR THE LAST SEVERAL HOURS IN A ROW. ALSO THE MULTISPECTRAL IMAGERY OVER THE LAST 3 TO 6 HOURS HAS SUGGESTED OCCASIONAL SMALL EMISSIONS OF ASH AND STEAM. THIS ALL IMPLIES THAT ASH IS STILL OF POSSIBLE SIGNIFICANCE IN THE AREA. IN A COUPLE OF HOURS THE FIRST VISIBLE SATELLITE IMAGES WILL ARRIVE AND THIS CLARIFY THE SITUATION MUCH MORE. ASH IS STILL ESTIMATED TO BE AS HIGH AS FL300. . TRAJECTORY: MOVEMENT OF ASH BETWEEN THE SUMMIT AND FL230 IS TO THE NORTH AT 10 KNOTS. MOVEMENT OF ASH BETWEEN FL230 AND FL300 IS TO THE NORTHEAST AT 10 TO 20 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 STATEMENT WILL BE ISSUED BY 13/1700 UTC. . PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS. . ORRISON NNNN