The Sea of Swords is on the west coast of Faerûn along the Sword Coast. Assuming that world turns the same way that our does (e.g. the sun rises in the east) there is going to be something called a Western Boundary Current along the Sword Coast pic.twitter.com/MCg2NYvCym
— Dugongs and Sea Dragons (@DugongsD) September 22, 2018
Heh. Back in 1979, when writing up a Realms merchant trading game, I sent TSR the Sword Coast currents map. There is indeed "The Vrail" (Western Boundary Current), but it passes down the W side of the Moonshaes. There's a much smaller, local Coastal Gyre flowing N, tight along…
— Ed Greenwood (@TheEdVerse) September 23, 2018
…the coast, then curling NW around the Whalebones and back S between the Whalebones and Ruathym and the Sea of Moonshae, that brings warm air and water from The Shining Sea N to Waterdeep and especially the Tethyrian coast (which usually experiences very mild winter weather).
— Ed Greenwood (@TheEdVerse) September 23, 2018
That's one of the reasons Waterdeep gets coastal fog (colder winds blowing out of the NW, onshore, across this warmer water). Mount Waterdeep shields the city against a lot of weather nastiness; that's why the city developed where it did: superb deepwater natural harbor in the…
— Ed Greenwood (@TheEdVerse) September 23, 2018
lee of a sheltering shieldwall of rock.
(I'd thought the coastal currents had passed into accepted, known Realmslore in the 1980s, but…obviously not. ;} )— Ed Greenwood (@TheEdVerse) September 23, 2018