Lewis Pugh

Introducing a precise open water swimming temperature scale

I get asked various questions related to cold because I like to write about it. Those questions often inspire further writing ideas. One thing I realised was there was no good agreement on cold water. A poll of open water gave the following results. Under 5ºC (41ºF) – 0% Under 10ºC (50ºF) – 7% Under 12.5°C (54.5°F)…

960hPA

How To: Pressure (synoptic) weather charts explored

Following on from the discussion on hectopascals and atmospheric pressure: Let’s use the same chart again. This time you know what the numbers mean, various high and low pressure areas. But there are different kinds of lines to be seen also. In this chart we are concerned with five types light black line with numbers…

960hPA

How To: “What does 965hPA mean?”

Courtesy of another search that brings people here, and following Hurricane Katya last week and the synoptic chart that I linked for it. So we’ve started with that same synoptic chart again. In this chart we have a low pressure area, Hurricane Katya, north west of Ireland, in sea area Rockall, right in the centre at…

Weather and Climate, Part 3

Part 2. Almost done. Obviously meteorology is a far more complex subject than the thumbnail I’m giving again. I’m just covering some of the major influencing factors for Ireland and the North East Atlantic. So last time we saw some of the prevailing winds ran opposite those across Ireland. To explain these difference we need…

Weather and Climate, Part 2

I finished Part 1 with the Coriolis effect. I said last time that the warmer air at the equator flows toward the poles. The Coriolis Effect impacts this to cause the major weather patterns. Since the world is a sphere, the surface of the earth at the equator is moving much faster than the surface…

Weather and Climate, Part 1

“Climate is what we expect, weather is what we get” – Mark Twain So I’ve written about the Shipping News and the databuoys and waves and wind etc. I thought I might do some more on the weather subject and move up to a bigger scale, particularly as it affects Ireland and the North Atlantic.…

Ocean Temperature Variation

Those who don’t swim in the swim much are often confused about what temperature to expect. The specific heat capacity of the ocean is greater than land or the atmosphere. This mean it’s will stay at a specific temperature and not quickly change. The volume of the ocean contributes to it retaining heat, as only…

Irish South Coast swimming conditions

For the South/South East, very warm water temperature, if we get them (which we haven’t really the last 2 summers), would be 17°C/18°C i.e. 62.5°F/64°F. Or at least there were 4/5 days I recall last year that I swam here in those temps. There was no consistent period however at that level, except one good…