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We were out running today, and came across two signs. No photos (we don't carry a camera in such situations), but they both are begging for some explanations.
Sign 1: On the Embarcadero, a flashing LED road sign advising motorists that there may be "Flooding at Embarcadero and Mission at high tide." Why only at high tide? Is there an oceanographer out there who can explain this?
Sign 2: In the corner of a window at Fuse, a bar at Broadway and Kearny that became somewhat notorious a few weeks ago for a Tuesday-night shooting, there's a sticker that says "Breast-feeding welcome here."
Breast feeding? We're all for it, but in a nightclub? Anyone got any thoughts about this?
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Mission and Embarcadero was part of an old tidal marsh, as was much of the SF coast. These are subject to tides, so there may have been a tidal channel inlet right at that point. Tides the the bay are small, so maybe only a spring (full moon) high tide in the right conditions (like all these storms) could cause flooding.
Here's an old SF watershed map: http://www.museumca.org/creeks/SFTopoCreeks.html
With the abnormally large (ie closer) moon, Saturday and Sunday gave us the highest tides in years (next higher tide: 2022!):
http://www.sanluisobispo.com/news/local/story/551806.html
However, it was only an inch higher than the previous record. The fact that it was windy and forming waves in the bay probably made more of a risk of flooding than the record high tide.
Yup, big tide swing brah. A 7.0 is pretty high bruddah.
I only breast feed at high tide anyways.
High tide + big storm = waves overtopping the seawall along Embarcadero.
i'm all for breast feeding in public, but expect mothers who do not to get upset at gawkers.
Whoa, who knew David Latterman was well-versed in SF watersheds on top of being a political analyst?
At any rate, lots of storm-drain outflows tend to back up at high tide because the Bay water is high enough that stormwater can't flow into the Bay like normal. That's in addition to what David was talking about.
Thanks. My first career was as a geologist. I bagged it to move out west and study people with rocks in their head.
I'm not an oceanographer but i'll give explaining this a stab:
When it is high tide, the tide is high, and therefore land that is low is now under water.
Can I haz my scientist pay now? kthxbye.