The end of the month, marked by the change to winter time, will be dominated by a polar jet that will increase instability.

Snow in autumn.  EFE / EPA / Grzegorz Momot.

The relative calm Y mild temperatures that has accompanied the arrival of autumn in Spain, with the exception of the Atlantic fronts going through this week the Cantabrian slope and the rains in the mediterranean during the Puente del Pilar, they come to an end with the second half of October. The instability and the temperatures will begin to register eigenvalues ​​for this month, in time for the Time change which will take place in the early morning of Sunday October 25.

Already on Thursday, they are expected in Northern Galicia, Cantabrian Sea, Northwest Navarra, Upper Ebro and Western and Central Pyrenees cloudy or overcast skies are expected and rainfall, more intense and with the possibility of being locally persistent in the Eastern Cantabrian. At east of the Balearic Islands and north coast of Catalonia, cloudy intervals, without ruling out some scattered showers or occasional storms, more likely in Menorca and in the first half of the day. It will snow around 1000 / 1300m in the Pyrenees, and between 1200 / 1600m in the rest of the mountain ranges of the extreme north.

The Nighttime temperatures will drop in most of the Peninsula, with weak frosts in areas close to mountain areas in the northern half and central peninsula. Daytime declines in the Balearic Islands, the Pyrenees and the eastern Andalusian coast. Temperatures will generally be lower than usual on these dates.

Rains and occasional showers in the north of the Peninsula and the Balearic Islands will continue the Friday, while nighttime temperatures will continue to drop in the northeast half of the peninsula, with Weak early morning frosts in the northern plateau and other high areas of the northern half of the peninsula and northeast of Castilla-La Mancha, with temperatures “significantly lower than normal on these dates in the Peninsula and the Balearic Islands, especially the minimum“.

On Saturday, it is likely that a storm is located to the west or northwest of the Peninsula, with an associated frontal system, which will leave the possibility of rainfall in the extreme northwest. In Canary Islands, there could be some weak and scattered rainfall on the islands of greater relief, more likely and abundant in Tenerife. The Sunday, but nevertheless, the Atlantic storm could deepen, affecting these two regions more intensely and with possibly strong storms in the westernmost islands of the Canary archipelago.

As of Monday, it is likely that the Atlantic storm is approaching the Peninsula, maintaining instability in the Canary Islands. Therefore, rainfall in the more prominent Canary Islands and in the extreme west of the peninsula is likely, without ruling it out in the rest of the Canary Islands and the western half of the Peninsula, and may reach be locally strong or persistent and accompanied by occasional storms in the west of the Canary Islands and in the extreme west of Galicia.

Will continue to blow the east wind on the Alboran coast, probably strong in the Strait. In the rest of the country, the south component wind will predominate, blowing with some intensity in the western half of the peninsula and in the Canary Islands, with possible intervals of strong wind in Galicia, Cantabrian Sea, Pyrenees, mountain systems of the western peninsula and mountainous islands of the Canary Islands.

In the following days, it is likely that the storm is located to the west of the Peninsula and is quite deep, being able to move later towards the British Isles. During these days, it is expected to generate cloudy or overcast skies and precipitation in the Atlantic slope and extreme north of the peninsula, which could be accompanied by storms And be locally strong and persistent in western Galicia, around the Central system, southern slopes of the Cantabrian mountain range and the Pyrenees and other areas of the peninsular southwest quadrant.

With less probability and intensity, they could also affect other areas of the Peninsula and the Canary Islands of greater relief, not expected in the south of the Levant or in the Balearic Islands, where slightly cloudy skies or with intervals of medium and high clouds will predominate. Within the uncertainty cited, it is likely that temperatures drop in the Atlantic and Canary Islands, and rise in the Mediterranean area.