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Log of INT night plan and operation during Cumbre Vieja volcano eruption

The volcanic eruption in the area of Cumbre Vieja, at La Palma, has started on the 19th September 2021. The INT reamined closed since the 23 Sep 2021 until the 11 October 2021. The table below contains information about the IAC volcanic plume prediction and the activity carried out at the INT during every night since 11th Oct 2021 to the 15th December 2021. After 15th December 2021 the INT has resumed normal operations.

Date Ash predition Autorized to open
Motive 		Open/Close
Motive 		Comments
Mon 11 Oct 2021 Yes Open 2.5 hr lost by weather
Tue 12 Oct 2021 No

ash predictions 		Close Off-sky training
Wed 13 Oct 2021 No

ash predictions 		Close Off-sky training
Thu 14 Oct 2021 No

ash predictions 		Close Off-sky training
Fri 15 Oct 2021 No

ash predictions 		Closed Off-sky training
Sat 16 Oct 2021 No

ash predictions 		Close Off-sky training CANCELLED - No students up
Sun 17 Oct 2021 No

ash predictions 		Close Off-sky training CANCELLED - No students up
Mon 18 Oct 2021 No

ash predictions 		Close No students up
Tue 19 Oct 2021 No

ash predictions 		Close No students up
Wed 20 Oct 2021 No

dome was not cleaned

ash predictions were good 		Close Off-sky training.
Thu 21 Oct 2021 No

ash predictions 		Close Off-sky training.
Fri 22 Oct 2021 No

ash predictions were good		 Close Off-sky training.
Sat 23 Oct 2021 No

ash predictions 		Close Off-sky training.
Sun 24 Oct 2021 No

ash predictions 		Close Off-sky training.
Mon 25 Oct 2021 No

dome was not cleaned

ash predictions were good		 Close Off-sky training.
Tue 26 Oct 2021 No

ash predictions 		Close Off-sky training.
Wed 27 Oct 2021 Yes Open Lost by weather: 1.5 hr

Lost by technical issues: 3.5 hr
Thu 28 Oct 2021 Yes Open Lost by technical issues: 1 hr
Fri 29 Oct 2021 Yes Open Observed full night
Sat 30 Oct 2021 No

ash predictions 		Closed No students up
Sun 31 Oct 2021 No

ash predictions 		Close No students up
Mon 01 Nov 2021 No

ash predictions 		Close No students up
Tue 02 Nov 2021 No

dome was not cleaned

ash predictions were good 		Close Off sky training
Wed 03 Nov 2021 No

dome was not cleaned

ash predictions were good 		Close Off sky training
Thu 04 Nov 2021 No

dome was not cleaned

ash predictions were good 		Close Off sky training
Fri 05 Nov 2021 Yes Closed

bad weather 		Lost by weather: 10.4 hr
Sat 06 Nov 2021 Yes

ash predictions 		Closed

bad weather 		Lost by weather: 10.4 hr
Sun 07 Nov 2021 No

ash predictions 		Close Off-sky training
Mon 08 Nov 2021 No

wind from the south

ash predictions were good 		Close Off-sky training
Tue 09 Nov 2021 No

ash predictions 		Close Off-sky training
Wed 10 Nov 2021 No

ash predictions 		Close Troubleshooting off-sky training
Thu 11 Nov 2021 Yes Open Lost by weather: 4 hr

Troubleshooting off-sky training
Fri 12 Nov 2021 Yes Open Lost by weather: 4 hr
Sat 13 Nov 2021 Yes Open Lost by weather: 2.5 hr
Sun 14 Nov 2021 No

ash predictions 		Close No students up
Mon 15 Nov 2021 No

ash predictions 		Close No students up
Tue 16 Nov 2021 No

dome was not cleaned

ash predictions were good 		Close No students up
Wed 17 Nov 2021 No

dome was not cleaned

ash predictions were good 		Close No students up
Thu 18 Nov 2021 No

ash predictions 		Close No students up
Fri 19 Nov 2021 Yes Open Lost by weather: 8 hr
Sat 20 Nov 2021 Yes Closed

South wind all night		 Lost night due to south wind
Sun 21 Nov 2021 Yes Close

South wind all night		 Lost night due to south wind and bad weather in general
Mon 22 Nov 2021 No

ash predictions 		Close No students up
Tue 23 Nov 2021 No

ash predictions 		Close No students up
Wed 24 Nov 2021 No

ash predictions 		Close No students up
Thu 25 Nov 2021 No

storm at ORM

ash predictions were good		 Close No students up
Fri 26 Nov 2021 Yes Close

bad weather		 Lost night due to hight humidity
Sat 27 Nov 2021 Yes Close

bad weather		 Lost night due to hight humidity
Sun 28 Nov 2021 Yes Open Lost by weather: 6 hr
Mon 29 Nov 2021 Yes Open Lost by weather: 7 hr
Tue 30 Nov 2021 Yes Open Lost by weather: 3 hr
Wed 01 Dec 2021 Yes Close

bad weather		 Lost night due to hight humidity
Thu 02 Dec 2021 Yes Open Lost by weather: 6 hr
Fri 03 Dec 2021 Yes Open

bad weather		 Lost by wind from the south: 3.5 hr
Sat 04 Dec 2021 Yes Close

wind from the south		 Lost night due to wind from the south
Sun 05 Dec 2021 No

ash predictions 		Close No students up
Mon 06 Dec 2021 No

ash predictions 		Close No students up
Tue 07 Dec 2021 No

ash predictions 		Close No students up
Wed 08 Dec 2021 No

dome need to be checked and no staff at ORM

bad weather predictions

ash predictions were good		 Close No students up
Thu 09 Dec 2021 Yes

storm at ORM

ash predictions were good		 Close

bad weather		 Lost night due to bad weather
Fri 10 Dec 2021 Yes Open

bad weather		 Observed full night
Sat 11 Dec 2021 Yes Open Observed full night
Sun 12 Dec 2021 Yes Open Observed full night
Mon 13 Dec 2021 No

ash predictions 		Close Dimitris up - Off-ky training
Tue 14 Dec 2021 Yes Close Lost night due to bad weather
Tue 15 Dec 2021 Yes Open Two hours lost due to bad weather

Since the 15 Dec 2021 the IAC stopped publishing the "Daily evaluation of the risk at the ORM by the volcanic plume from the Cumbre Vieja eruption - Reports" at their Volcano 2021 plume risk web page. Since that date, the INT Support Astronomers have been observing in the INT every night, and the INT resumed its usual operation still in service mode.

The volcanic eruption on La Palma, which began on the 19th September 2021, was officially declared over on the 25th of December. Indeed the volcano had already stopped its more evident activity by 13th of December, and it has been quiet since then. Therefore, from the middle of January 2022, normal visitor-mode observations were be possible (subject to ING's Covid-19 procedures for visiting astronomers) for all scheduled programmes at the INT.




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Last modified: 06 April 2022