What should visitors watch out for on 8 November?
The state weather service AEMET warns of heavy rain in the Área metropolitana de Tenerife zone on Sunday 8 November, from 10:00 to 18:00. You need not convert anything: the Canaries are on UTC in November, so these times are local time.
AEMET expects 20 millimetres of rain in one hour, with a probability of 40 to 70%. According to the warning text, the western and southern slopes get the most.
The notice covers a single warning zone, not every resort automatically. It does not say whether the southern resorts have a warning of their own, but the warning map on the official website shows it.
Anyone out and about on Tenerife should avoid barrancos and ravine walks, as reports on the weather advise. AEMET itself asks people to stay alert and follow the latest forecasts.
How serious is yellow, and who decides on measures?
Yellow is the lowest of AEMET’s three warning levels and signals no extraordinary danger. Even so, local flooding, flooded roads and barrancos, and traffic problems are possible.
AEMET rates the situation as moderate, the certainty as likely and the urgency as immediate. Moderate damage is possible, mainly for vulnerable people and in exposed areas.
Two bodies decide separately. AEMET sets the colour, while the Dirección General de Emergencias (the Canaries’ emergency service) declares Prealerta, Alerta or Alerta máxima when needed, and it is not confirmed whether the regional government has set a level of its own for 8 November.
What weather lies behind the warning?
According to a special AEMET notice, an Atlantic low brings the Canaries heavy to very heavy rain, thunderstorms and high seas. Strong to very strong gusts are forecast in the mountains with south-westerly winds.
The rain began in the west on Friday 6 November. The biggest deterioration was expected on Saturday evening, 7 November.
La Palma is hit hardest. Tenerife, La Gomera and El Hierro get some rain, mainly in the west.
Showers are forecast on all islands on Sunday, and the rain should ease on Wednesday 11 November. Forecasts expect high waves on the coasts from Saturday evening to Sunday.
According to reports of 1 November, snow fell on the Teide from about 2,700 metres. The Cabildo (island government) lets climbers up to the summit only with winter equipment and crampons, while the national park stays open to visitors.
How often does AEMET warn of rain on Tenerife?
Warnings like this recur on Tenerife several times a year. In March, heavy rain in the metropolitan area triggered an ES-Alert (a mobile phone warning).
Canarian media reported more than 80 litres per square metre in one hour. In July, reports spoke of an orange warning for the north and the metropolitan area.
On 5 October, yellow applied to three islands, including Tenerife’s metropolitan zone. On 21 and 22 October, AEMET warned orange for El Hierro, La Gomera and the east of La Palma.
There it was up to 30 litres per square metre in one hour. The rest of La Palma and all of Tenerife were on yellow, with up to 15 litres.
On 7 November, Canarian media reported a Prealerta over flood risk around the storm Bruna. Beyond the headline, the research found nothing on it.
What do the authorities advise in heavy rain?
During the October rain, the Dirección General de Emergencias gave clear homework. People should check roofs, terraces, tanks, drains and downpipes.
Never park in a barranco, even under a clear sky. For power cuts, the authority recommends a torch, drinking water, medicines and a battery radio, and windows and doors should be secured.
Avoid outings, camping and unnecessary journeys. Do not cross areas that could flood.
What is still open, and what comes next?
The research found no measured rainfall for 8 November, nor any road closures or cancelled events. Measures by the Cabildo or the Santa Cruz council are also unknown so far.
The warning ends on 8 November at 18:00. Whether AEMET extends or raises it later is open.
As this notice is already an update, more are likely to follow. From Wednesday 11 November, the forecast says the rain should ease.