FVXX21 KWBC 201200
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 1200 UTC 20 MAR 1999 BY THE WASHINGTON VAAC
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POPOCATEPETL 99-039    MEXICO  19.02N 98.62W
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BACKGROUND:    POPOCATEPETL   MEXICO (1401-09)
               SUMMIT HEIGHT 17930 FT (5465 M)
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SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL IMAGERY
THROUGH 20/1115 UTC. 20/0000 UTC MEXICO CITY UPPER AIR SOUNDING.
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ERUPTION DETAILS: CENAPRED REPORTS AN EXHALATION AT 20/0041 UTC TO
FL400.  NEW PUFFS STARTING AT 20/0815 UTC.
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DETAILS OF ASH CLOUD: SATELLITE IMAGERY AT 20/0815 UTC INDICATES
THAT THE VOLCANO HAS ERUPTED ONCE AGAIN.  SEVERAL SMALL ASH CLOUDS
CAN BE SEEN MOVING TOWARD THE EAST-SOUTHEAST.  ONE ASH PLUME IS
15 KM WIDE AND EXTENDS FROM 18.8N/98.1W TO 19.1N/97.6W.  THE OTHER
PLUME IS 5KM WIDE AND EXTENDS FROM 18.6N/97.7W TO 18.9N/97.3W. 
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TRAJECTORY: BASED ON 20/0000 UTC UPPER AIR WIND DATA THE ASH IS AT
FL300 AND MOVING EAST-SOUTHEAST AT 20 TO 25 KTS.
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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/)
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OUTLOOK: SEE SIGMETS.
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THE NEXT MESSAGE WILL BE AT 20/1800 UTC.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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"Attached Graphic Map Depicting Ash" 

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