San Marcos Mercury | Local News from San Marcos and Hays County, Texas
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Hays County is under a flash flood watch until noon Friday as a severe storm system moves east across Texas, the National Weather Service said. The agency has issued this advisory:

The much anticipated weather event is coming together over portions of the area this morning…still waiting on the main impacts later today and tonight. A Flash Flood Watch is in effect until Noon on Friday. Severe Thunderstorm Watch is in effect for western sections of South Central Texas until 1 pm this afternoon. The severe threat will spread to most if not all of the area by this afternoon and evening. More watch boxes are anticipated. Heavy rain threat will increase by tonight. The main impacts of this storm system will keep us busy for the next 24 hours.

The large upper low is currently over northern Mexico just to the south of El Paso. It is already causing widespread thunderstorm activity near the Rio Grande…spreading these storms into South Central Texas. We have already seen severe thunderstorms early this morning. The atmosphere is primed to give us large hail and damaging wind threats. The threat for tornadoes is also on the increase, especially across the southern half of Texas…so cant rule them out today as well. Look for additional Severe/Tornado watches to be issued today for all or portions of the area. The southern half of South Central Texas will see the largest severe threat.

With such a large storm system…it is hard to pinpoint when and where the next storms will form. There won’t be 24 hours of continuous rain…but passing clusters of storms…each one capable of producing quick bursts of 1+ inches of rain. Overall widespread rain totals of 2-4 inches are likely…isolated totals through tomorrow afternoon could exceed 4-6 inches in some spots. The heavy rain threat this morning and afternoon will be in areas that see “training” storms, storms that move over the same location. Later tonight…storms will likely slow down as the upper low gets closer and a very large cluster of storms develops…increasing the chances for flash flooding. The main impact time of the widespread heavy rainfall should be from about 8 pm tonight until 8 am on Friday morning. Be cautious if driving the next 24 hours…especially tonight. Low water crossings will likely flood. It will be a good night to stay home and off the roads. Turn Around Dont Drown.

It is going to be a busy 24 hours…with all elements of severe weather possible…Hail, strong winds, flash flooding, and even an isolated tornado possible. Keep watch of the weather very closely…go to our weather service website for the latest information on watches/warnings/advisories…and watch the radar closely.

NWS forecast through the weekend:

Today: Showers and thunderstorms, mainly after 1pm. Some of the storms could be severe and produce heavy rainfall. High near 75. Southeast wind around 10 mph. Chance of precipitation is 80%.

Tonight: Showers and thunderstorms. Some of the storms could be severe and produce heavy rainfall. Low around 64. Southeast wind between 5 and 10 mph becoming calm. Chance of precipitation is 100%.

Friday: Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Cloudy, with a high near 78. Calm wind becoming east around 5 mph. Chance of precipitation is 60%.

Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East northeast wind around 5 mph becoming calm.

Saturday: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. North northeast wind around 5 mph.

Saturday Night: Mostly cloudy, with a low around 61. North wind between 5 and 10 mph.

Sunday: Mostly sunny, with a high near 79. North northeast wind around 10 mph.

Sunday Night: Partly cloudy, with a low around 60. North northeast wind between 5 and 10 mph.

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