Currently in San Francisco — September 27, 2023: Even warmer Wednesday

The weather, currently.

Wednesday will be our warmest day of the week and looks to be quite beautiful citywide. Daytime temps will head a bit north of 70 with increasing afternoon breezes turning into the occasional powerful gusts up to 25mph. Wednesday night we’ll enjoy lows in the mid-50s and more of that exciting wind that just won’t settle down.

— Britta Shoot

What you need to know, currently.

With drought affecting broad swaths of the Mississippi River valley, river levels have dropped so low that saltwater from the Gulf of Mexico is creeping upriver in the Mississippi itself. At its current rate of progression, the Mississippi will turn too salty for water treatment plants at New Orleans to produce drinking water in just a few weeks.

Since saltwater is more dense than freshwater, the saltwater is actually moving upriver along the riverbed — within the river itself. Federal engineers that maintain the river channel have built a partial dam designed to slow the saltwater’s upstream progression, and increasingly extreme measures will need to be taken once the saltwater reaches New Orleans — like transporting freshwater by barge, and hastily building a water pipeline to the city.

Similar events happened in 1988, 1999, 2012, and again last year — but this one seems especially severe.

As global warming melts ice worldwide, sea level rise will make problems like this worse not just for Louisiana, but all coastal cities worldwide.

— Eric Holthaus

What you can do, currently.

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