High pressure that brought a break in the rains is now shifting eastward, away from South Central Texas. Well to our southwest, a tropical disturbance is forming along the Pacific Coast of Mexico in the Gulf of California. These to features will interact over the next few days to bring another rain event to the region.

One last day of sunny to partly cloudy skies on Wednesday will allow highs to reach near 90 and we’ll stay dry for now. But overnight, that high level Pacific moisture will push in from the west bringing cloud cover to the area by Thursday morning. As the plume of water vapor spread across the state, embedded disturbances aloft will promote scattered showers and a few thunderstorms by Thursday afternoon across the San Antonio area.

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The uncertainty comes into play as a weak cold front sags into north Texas late Saturday. That boundary will serve to focus heavier rains along its length. Should it move closer to us, we might see heavier rains than we expect right now.

It has already been one of the wettest Septembers in San Antonio history; more than 1.4 inches in the next few days will put 2018 as the number one wettest September in recorded history.

Temperatures will stay near seasonal normals with lows in the 70s and highs upper 80s to near 90.

The Autumnal Equinox occurs Saturday, the first day of Fall. See the details in the Seven Day Forecast.

Dan Robertson

Twitter: @TexasThunderman

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