âDome of Doomâ Will Bake Texas and Central U.S. Next Week Jul 24 2021, 9:25 PM July 23 2021, 10:22 PM July 24 2021, 9:25 PM (Bloomberg) -- Heat will bear down on Texas and the Great Plains within days, driving temperatures in Dallas above the 100-degree mark for the first time this year.A dome of high pressure will build across the middle of the U.S., boosting demand for power to run air conditioners, said Jim Rouiller, lead meteorologist at the Energy Weather Group. The heat will expand eastward later next week into Chicago while a blanket of humidity wi... (Bloomberg) -- Heat will bear down on Texas and the Great Plains within days, driving temperatures in Dallas above the 100-degree mark for the first time this year.