The above image was just taken from the New Braunfels area doppler radar. The white arrows show the location of the cold front, which is noted by the thin blue and green line on the radar. As you can see, the front has moved South of Austin, and is approaching San Antonio at this time.
Cold air behind the front has been shifting directly Southward in West Texas, faster than it has been moving Eastward toward the I-35 corridor so far this afternoon, as illustrated on the image below:
The colder air is, however, starting to "catch up" on the Eastern side, as indicated by the green shaded colorations that are moving Southward (which correspond to temperatures in the 50s and 60s instead of the 70s and 80s ahead of the front. The Southward movement of this cooler and colder air will result in temperatures falling rather quickly in the Austin area after 5pm, and in the San Antonio area after 6pm.
In the rain department, precipitation remains fairly solid (though light) across much of northwest and northcentral Texas, but has not penetrated very far to the South along I-35 as of yet. Showers and isolated thunderstorms are breaking out to the East of I-35 between there and Houston (as noted on the radar image at the top of the post).
I would expect lower clouds, fog and drizzle to overspread much of the region as the colder air sinks Southward late this afternoon and evening, with light rain, scattered showers and isolated thunderstorms also breaking out in some areas. The heavier showers are likely to be East of I-35 and toward east-central and southeast Texas, as indicated on the rainfall forecast image below, which is valid from 7pm to 1am CDT this evening:
Lighter amounts, mainly in the form of drizzle or very light rain, can be expected West of that area toward the I-35 corridor.
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