Weather assessment for skipers

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Marine weather overview — next 12 hours

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Add your own observations to complement the meteorological and radar indicators.

Skipper observations
Lightning observed
Thunder heard
Rapidly developing cumulus / cumulonimbus
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Convective weather assessment

Bora, the Adriatic wind every skipper must understand

 Introduction

If there is one word every sailor hears within days of arriving in Croatia, it is Bora.

Ask local sailors about dangerous weather, and they will quickly point towards the Velebit Channel, Senj or the Pag Bridge. Pilot books describe exposed anchorages, marinas display Bora warnings, and weather forecasts often announce its arrival one or two days in advance. For good reason.

The Bora is the Adriatic’s most famous wind. It can produce sustained gale-force winds and violent gusts exceeding 50 or even 70 knots in exposed locations. Unlike a Nevera, however, the Bora rarely arrives unannounced. It is one of the best understood and most predictable weather hazards in the Adriatic. Therefore, understanding why it forms and how to monitor should be part of every skipper’s preparation before sailing these waters.

Funnelling Bora in Portić - Borovinje, 4th July, 2025

Why Adriatic weather is unique: Bora versus Nevera?

Bora or nevera? Two Adriatic hazards every visiting skipper should understand

Ask a sailor preparing for a first cruise in the northern Adriatic which local weather hazard they have heard about, and the answer will almost certainly be the Bora.

Bora 30 knts katabatic wind in the Velebit on the way to Zadar in February 2021.

Before long, they will learn where it blows hardest, which channels become dangerous, which anchorages should be avoided, and where to find reliable forecasts. Every marina, pilot book and cruising guide discusses the Bora. It is rightly respected as one of the defining winds of the Adriatic.

My own experience was no different.

Having sailed extensively in Norway and the French Mediterranean, I was already familiar with powerful katabatic winds. Before arriving in Croatia, I had read about the Bora, learned how it develops, and understood how to monitor forecasts 

What I had never heard about was the Nevera.

I first encountered the word in a newspaper article describing the violent storm that struck Rovinj in June 2025. Later that same year, I experienced three Neveras myself. One of them dragged my boat ashore while we were anchored overnight in the Venetian Lagoon, despite what appeared to be a relatively benign weather forecast.

That experience made me realise something important. I had learned how to forecast the wind but I had never learned how to forecast convective weather. And that, I believe, is a gap shared by many sailors visiting the Adriatic.

Why Adriatic weather can challenge experienced sailors?

After more than 40 years of sailing in different parts of the world, I thought I had developed a sound routine for interpreting weather forecasts before and during a passage. Like many experienced sailors, I would carefully examine the wind forecast, pressure systems, expected gusts and sea state before deciding whether to sail, where to anchor, or when to seek shelter.

Then, on a summer passage to Venice, I learned the important lesson that Adriatic weather can surprise experienced sailors...

Meeting with a nevera on the way to Venice, 21 August 2025

On our way to get kids and grand-kids on-board on 22 August, we moved to Venice on 20 August to make sure we are there when they arrive in due time because of weather forecast.

The 15 hours ride was planned during the night in order to land early morning in Venetia, ahead of some unstable weather anticipated...

Adriatic weather forecast sites

This page is a compilation of links that I use to explore the weather situation in Northern Adriatic.

Belisama in Limfjord, 20-21 July 2025

As part of or summer explorations, we decided to explore the Limfjord with a couple of South-African friends on a weekend where all conditions could be met: none of us four having to work and weather permitting. The ride from Marina Polesana is 27 nautical miles, heading north through Fažana and Rovinj, before heading up the Limfjord. 

Our Australian friends were there for a couple of days last year after we met in Umag and they were advising us to visit this place. And we did and understood why...