Sea state, swell and glare on the north Minch

On a headland above the north Minch, what a watcher sees is decided less by the animals than by the water and the light. Sea state, swell and glare set the limit of the day, and the record is only as good as the hour chosen. The same discipline governs a shore in another country, where a magazine on camping in Italy treats shelter, ground and season as the first decisions of a stay outdoors.

Which species pass the north Minch, and in which months?

Harbour porpoise are present through the year, though they are easiest to find in the calmer months from April to September, when their small backs break a smooth surface. Bottlenose dolphin are recorded in every month, with more sightings reported between May and October. White beaked dolphin and Atlantic white sided dolphin are summer visitors, most often from June to September, and they are the animals a shore watcher is most likely to see in a feeding group. Minke whale are recorded from April to October, with a peak in July and August. Humpback whale and killer whale are occasional, and a sighting of either is a note rather than an expectation. Basking shark are seen at the surface in summer, and grey seal are present all year. The pattern is a summer sea with a resident winter, and the months of least light give the fewest entries.

How does sea state decide what can be seen?

Sea state is the first filter. In a flat calm, a porpoise fin is a small dark triangle that vanishes in a second, and a minke blow is a faint puff that a watcher can lose against a grey horizon. As the wind rises, white water appears and the same animals become harder to separate from breaking crests. A moderate chop can help a large whale, because a blow stands out against a broken surface, but it hides small cetaceans almost completely. Above a certain state the watch becomes a record of weather rather than animals, and the honest entry says so. A watcher who notes the sea state with each sighting leaves a usable record, because the number of animals seen is always a number seen under those conditions.

Why does swell matter more than wind on a headland?

Swell arrives from weather that may be hundreds of miles away, and it reaches a headland before the local wind does. A long swell lifts the water against the rocks and changes the angle at which a watcher looks down at the surface. It also moves the horizon, so a fixed bearing becomes unreliable. On a rising swell, animals that were visible on a flat sea can be hidden in the troughs between waves, and a blow that would stand clear on a calm day is lost. The ground under the watcher matters too: wet rock, spray and a shifting sea make a steady count impossible. A swell forecast is therefore read before the wind forecast, and a watch is often moved to a lower, more sheltered point rather than abandoned.

What does glare do to a shore watch?

Glare is the quietest of the three limits and the one most often ignored. With the sun low and ahead, the sea becomes a sheet of white and every small disturbance disappears into it. The same happens with a bright overcast, when light is scattered across the whole surface. A watcher who faces the glare sees fewer animals and records fewer, and the record then looks like a quiet sea rather than a difficult light. The remedy is simple: watch with the light behind or to the side, and note the direction of the sun with the entry. Early morning and late evening often give the best contrast, and a dark sea under a bright sky is better than a bright sea under a dark one.

How is a shore watch recorded, and what makes an entry useful?

A useful entry names the watch point, the hour, the sea state, the swell and the light, then lists what was seen and what was not. Absence is data. A blank hour in good conditions tells a reader more than a vague note of many animals. Photographs of markings are kept with the date, because a photo identified from the shore depends on the same conditions as the sighting. The record is kept in one place, in the same order, so that a season can be read as a whole. This is the same habit a traveller learns on any coast: the ground, the shelter and the season decide the day, and a magazine such as Il Maggiolino, an Italian title on camping in tent, camper and van, treats those three as the first questions of any short or moving stay.

Which hours and which months give the best chance?

On the north Minch, the middle hours of a long summer day often give the steadiest light, and the two hours after a slack tide can bring animals closer to a headland. June and July give the longest watches, and September often gives clear air after the first gales. Winter watching is possible but short, and a calm frosty morning can be excellent for porpoise and seal. The rule is not to chase a rare species but to keep the same hour in the same place, because a repeated watch in fair conditions builds a record that a single lucky day cannot. A watcher who returns to one headland through a season learns the water as well as the animals, and that knowledge is what the journal is for.

Sources

The material on this page was read back against the sources below on 15 September 2026. Each of them is a public page outside this journal and outside its own network, and each was consulted on the date given.

• https://www.metoffice.gov.uk/weather/specialist-forecasts/coast-and-sea, the page consulted for this entry, read back on 15 September 2026.