An unexpected arctic cold front brings an ice storm to Austin and a variety of weather-related emergencies. Meanwhile, Owen deals with the fallout of the 126 closing, as Tommy, T.K. and Gillian settle into new employment, and Judd and Grace prepare for the birth of their first baby.

As the unexpected arctic cold front and ice storm continues to cause havoc in Austin, Tommy, T.K. and Gillian race to rescue a young boy who has fallen in a frozen pond. Judd and Mateo work furiously to help a trapped Paul, and Owen takes drastic measures to save a man who has been stabbed and left for dead.

As the unexpected arctic cold front and ice storm continues to cause havoc in Austin, Owen works to rescue the lives of the stranded migrants; T.K.'s life hangs in the balance and Grace prepares for the birth of her baby.

Grace is caught in the ice storm as she goes into labor, and Judd, Owen and Tommy race to find her.