This year's early bout of heat is likely to blame for the early sightings. The National Weather Service has issued warnings for much of Southeast Texas this week, where an unseasonably intense heat wave is developing. Cities like Houston are expected to hit the mid to upper 90s this week, possibly breaking temperature records for May.

Forecasters expect multiple records to be broken over the next week as an early heat wave settles over the region.

Heat advisories and extreme heat warnings are in effect west of Houston this week as an unusually early heat wave takes hold. What do these heat alerts mean?

The Texas-Mexico border is scorching under a record-setting heat wave, with temperatures soaring past 100 degrees, making it Earth's hottest spot today.

A brutal and record-early heat wave is baking Texas this week — bringing the triple-digit temperatures typical of July to the middle of May. The sudden heat spike, which was made more likely by

Summer temperatures in Central Texas are predicted to break records this week. You can almost feel the heat coming off these photos.

Record-breaking Texas heat threatens millions as forecasts predict nationwide temperature extremes through summer. Learn the risks and how climate changes

A Texas heat wave could produce record high temperatures this week. Austin has opened cooling centers to help residents stay safe.

An extreme heat warning is in effect for San Antonio Wednesday until 9 p.m. The highs on Wednesday and Thursday will be around 105. Highs on Friday and Saturday will be around 102 and the high on Sunday will be 101. And even more records could fall—with the rising temperatures.

The Texas power grid is expected to sail through the first major heat wave of the year without issue, largely thanks to its diverse and growing mix of power plants and renewable energy. That's an observation energy professionals closely following the Texas Legislature made with some irony,