FVXX21 KWBC 040935
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VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0935 UTC 04 APR 1999 BY THE WASHINGTON VAAC
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POPOCATEPETL 99-059    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 MULTISPECTRAL AND SHORTWAVE INFRARED
IMAGERY. 00 UTC MEXICO CITY SOUNDING. 
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ERUPTION DETAILS: ERUPTION BETWEEN 04/0815 AND 04/0845 UTC.
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DETAILS OF ASH CLOUD: GOES-8 MULTISPECTRAL IMAGERY SHOWS AN ERUPTION
OF POPOCATEPETL. SHORTWAVE INFRARED IMAGERY SHOWS A WELL DEFINED HOT
SPOT AT THE VOLCANO LOCATION. SATELLITE ANALYSIS SHOWS THE ASH CLOUD
AS OF 04/0845 UTC ALONG A LINE 33 KM LONG (18 NMI) AND 10 KM WIDE (5
NMI) FROM 19.16N 98.47W TO 18.93N 98.27W. BASED ON WINDS FROM THE 00Z
MEXICO CITY SOUNDING (76679)...ASH IS ESTIMATED TO BE AT OR BELOW
FL300.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST ASH BETWEEN FL180 AND FL300 TO
MOVE EAST NORTHEAST AT 15 TO 25 KNOTS.
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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 VAFTAD.
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THE NEXT MESSAGE FOR THIS EVENT WILL BE ISSUED BY 04/1530 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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