Atlantic Upper Low 'Alice': How Prepared Is Mallorca for Thunderstorms, Hail and Heavy Rain?

Unsettled conditions are heading for the island

I'm sitting with a cup of coffee in Palma, listening to the rattling of the shutters and the slap of the first gusts along the Passeig Marítimo. An Atlantic upper low, which some call “Alice”, is steering toward the Balearics. In short: changeable, often wet, locally intense. The question is: How well is Mallorca prepared for such suddenly occurring heavy-rain events?

Why this low behaves differently

This is not a simple Atlantic storm but an upper-level low. These systems are notorious for changing wind directions and precipitation patterns very quickly. The result: very different conditions over short distances. While the cliffs at Port d'Andratx resist the wind, streams in the valleys of the Serra de Tramuntana can swell within an hour. To locals that sounds familiar, but precisely that makes the situation treacherous.

Specific local risks

Rain amounts will vary greatly locally. In lower areas of Mallorca, flooding is a threat; on narrow coastal roads, flash floods can form rapidly. Short, intense thunderstorms will bring hail to the suburbs of Palma and to agricultural areas around Selva. The wind will shift to east to northeast and can blow in gusts at exposed spots — for example along the Passeig Marítimo or the cliffs near Andratx. This morning I saw police at the harbor advising boat owners — the concern is real and tangible.

What is often overlooked

Public discussions usually focus on roads and boats. Less noticed are the sewers in older neighborhoods, agriculture's sensitivity to hail damage, and the role of small volunteer protection groups in villages. Many municipalities have outdated storm drains or insufficient retention areas. When manhole covers are foaming and water presses through narrow lanes, it becomes clear how localized the problems are — and how varied the responses.

Practical measures — what municipalities should do

There are concrete steps that can reduce risk: targeted cleaning of street drains before storm periods, temporary closures of vulnerable access points to waterways, rapid deployment of mobile pumps, and coordination with fire brigades and harbor authorities. For port areas, regulated berthing in protected marinas and clear communication chains are important. Municipal warning apps work well when linked to clear behavioral guidelines — there is no reason to panic at every alert, but stay attentive.

Tips for residents and visitors

Short term: Keep a flashlight ready, park vehicles on higher ground if possible, and leave boats in safe harbors. Avoid walks on steep slopes and narrow coastal paths. Do not drive through flooded underpasses during heavy rain — pumps often cannot provide immediate relief.

Preventative: Check roofs and gutters, secure loose items on terraces, and keep insurance documents accessible. Farmers should cover vulnerable crops and beekeepers secure their hives. After the rain: take photos, document damage, and inform the municipality if drains are clogged.

Outlook and opportunities

The uncertain phase is expected, according to forecasts, to last from late Wednesday evening through midweek, with temperatures remaining mild. Such events are unpleasant but also provide an opportunity to identify and fix infrastructural weaknesses. In the long term, targeted investments in retention basins, renaturalized stream channels and modern sewage systems could make Mallorca more resilient — better protected against weather extremes without destroying the island's character.

For now: stay alert, check weather apps regularly, and plan sensibly. And yes, a bit of patience helps — the island knows these October days. Authorities will provide updates if things change, and until then smart preparation is the best defense against “Alice”.