Cold front surges into the city, bringing low temperatures

The center of a well-defined low-pressure system will be located right in the middle of Texas early Sunday morning. This will help to do two things.

First, scattered strong to severe thunderstorms are possible early in the morning across south-central Texas. Then, as the low-pressure system moves east, a cold front will move straight through San Antonio.

Thunderstorms

The only chance of thunderstorms Sunday will be between midnight and 7 a.m. After that, all storm activity is expected to move off to the north and east, toward East Texas and Louisiana.

The overall chance of earlymorning storms in San Antonio is 30-40%, meaning there is a decent chance the Alamo City misses out entirely. Higher storm chances are expected just to the north, toward Boerne, Canyon Lake, and New Braunfels.

A few storms could be very strong or even severe, capable of large hail or damaging wind gusts. Thankfully, the window of time when storms are possible will be brief, ending before sunrise. The rest of the day will be dry with ample sunshine expected to return to South Texas.

Winds from northwest

As the low-pressure system moves off to the east, winds will start to change direction. By 10 a.m., winds will be coming in from the northwest as the cold front begins to sweep through. However, the cold air will be delayed. In fact, temperatures will still rise to the upper 60s to near 70 degrees by Sunday afternoon.

As winds continue to move into San Antonio at 20 mph, the chillier air will eventually arrive during the evening. Temperatures will fall into the 50s after 6 p.m., quickly reaching the 40s around 9 p.m.

Overnight and into early Monday morning, low temps will bottom out in the upper 30s to near 40 degrees, staying above the freezing mark across all of South Texas. However, wind chill values will be several degrees colder, making things feel like 30 to 34 degrees in San Antonio.

Monday will be cool but still comfortable in South Texas. After starting near 40 degrees, high temperatures will rise into the upper 50s to low 60s across the region. Bright and sunny conditions are expected with hardly a cloud in the sky.

Incoming week

Just like Monday, Tuesday is expected to be another cool, gorgeous day in South Texas. It’ll be another chilly start as lows fall to the upper 30s and low 40s. Then, a quick warm-up will ensue, rising to 60 degrees by noon and topping out in the mid to upper 60s by the afternoon. Enjoy the sunshine Tuesday before changes start to arrive for the rest of the week.

Wednesday is still looking good as high temperatures rise into the upper 60s. The only major difference will be more cloud cover in the area, but no rain is expected quite yet.

Rain chances will start to move into the forecast by Thursday. Much of the day will likely be highlighted by overcast skies, but light rain showers will move in from the south by the afternoon and evening. Heavier rain is expected overnight and into much of Friday. It’s too early to tell exactly how much rain will fall, but it has the potential to be a significant rain event. Stay tuned to expressnews.com/weather for updates throughout the week.