According to Oncor, heavy lightning and straight-line winds of 75-80 mph have caused significant damage in North Texas. Track power outages here.

Nearly half of Texas — more than 120 counties — is under an extreme cold watch or warning this week as "dangerously cold wind chills" drive ... Forecast maps show lows, highs as Arctic air ...

Severe storms and tornadoes are threatening the two states. See which areas are at risk, when storms will hit, and what experts are saying.