ISSUED 2200 UTC 04 DEC 1999 BY THE WASHINGTON VAAC

TUNGURAHUA 99-205 ECUADOR 1.47S 78.44W

BACKGROUND: TUNGURAHUA ECUADOR (1502-08)
SUMMIT HEIGHT 16480 FT (5023 M)

SOURCES OF INFORMATION: GOES-8 VISIBLE..MULTISPECTRAL AND INFRARED
IMAGERY. UPPER AIR DATA FROM THE GEOPHYSICAL INSTITUTE.

ERUPTION DETAILS: VISIBLE ASH PLUME DETECTED AT 2015 UTC 04 DECEMBER
1245 UTC.

DETAILS OF ASH: CLOUDS HAVE CLEARED SUFFICIENTLY TO REVEAL A NARROW
ASH PLUME EMANATING FROM TUNGURAHUA. AT 2015 UTC THE 10 KM (5 NMI)
WIDE PLUME EXTENDED FROM THE SUMMIT TO THE SOUTHWEST FOR 45 KM (24
NMI) TO 1.8S/78.7W. THE PLUME DID NOT HAVE A GOOD SIGNATURE IN
MULTISPECTRAL IMAGERY. THIN HIGH CLOUDS RETURNED OVER THE SUMMIT
AND SURROUNDING VICINITY BY 2115 UTC. THE PLUME WAS ESTIMATED AT
FL240.-----------------------

ISSUED 0140 UTC 05 DEC 1999 BY THE WASHINGTON VAAC

SAN CRISTOBAL 99-014 NICARAGUA 12.7N 87.0W

BACKGROUND: SAN CRISTOBAL NICARAGUA (1404-02)
SUMMIT HEIGHT 5725 FT (1745 M)

SOURCES OF INFORMATION: GOES-8 VISIBLE..INFRARED AND MULTISPECTRAL
IMAGERY. 04/1200 UTC AVIATION MODEL UPPER-AIR SOUNDING DATA.

ERUPTION DETAILS: CHINANDEGA NICARAGUA METAR REPORT INDICATED
MODERATE ACTIVITY AT 0000 UTC.

DETAILS OF ASH CLOUD: MID AND HIGH LEVEL CLOUDS PRECLUDED THE
DETECTION OF ASH IN SATELLITE IMAGERY THROUGH 05/0115 UTC. NO
ADDITIONAL INFORMATION IS AVAILABLE.

TRAJECTORY: ASH FROM SUMMIT HEIGHT TO FL240 WOULD MOVE TOWARDS THE
WEST BETWEEN 10 AND 20 KNOTS.