Sand in the Coffee, Vol. 139: the tide that barely moves, and what actually changes the waterline
Myth first: there is no big tide on this coast, so the water you see at 9 a.m. is the water you’ll see at 3 p.m.
Half true, and the wrong half will cost you a chair. The northern Gulf does have a tide, but it is shy, usually a foot or so between high and low, and on many days it rolls through once rather than twice. Compare that with the Atlantic, where the beach can change shape in an hour. Here, the thing that moves the waterline is more often the weather.
what actually moves the water
- Wind direction. A steady push from the south stacks water against the shore and the line creeps up the sand. A strong wind off the land, like the ones that follow a cool front, can pull it back and leave extra beach.
- Swell from a distant system. Water can run higher on the sand days before a storm shows up on the radar, and for a while afterward.
- The moon. Yes, it counts, but it is the quiet voice in the room.
what to do with this
- Set up on the dry, soft sand, not the damp line. A darker, firmer band means water was just there. If your towel is on it, so is your next wave.
- Walk at the low end of the day’s water. Firm, wet sand is easier on the legs and is where shells and shark teeth show up. Check /beach-today/ for conditions, and look at the flag before you wade in.
- Watch the sandbar, not the surface. A calm stretch of water with a line of small breaks past it usually means a bar. Know where it is before you send the kids out to it.
- After a front, check the wind. A north wind often means flatter water and a wider beach, which is the best walking day of the month.
the sanity check
Pick a post, a pier piling or a dune fence, and note where the water is when you arrive. Look again after lunch. If it has moved a few steps, that is the whole tide. If it has moved a lot more, the weather did it, and that is your cue to look at the sky.
The cam at /live-cam/ is a handy way to do this from the couch: open it in the morning and again in the afternoon, and you will see the waterline do the work for you.
— Chris
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