I guarantee that there were many widows in Israel during the time of Elijah when there was a drought for three and a half years, causing a great famine throughout the country.
Elijah the Tishbite (from Tishbe in Gilead), told Ahab, “As the Lord, the God of Israel, lives, the one I serve, in the years to come there will not be any dew or rain unless I say so!”
At that moment Jesus was filled with the joy of the Holy Spirit, and said, “I thank you Father, Lord of heaven and earth, for you hid these things from the wise and clever people and revealed them to children! Yes, Father, you were pleased to do it in this way.
That's no way to speak, for who are you—a mere mortal—to contradict God? Can something that is created say to its creator, “Why did you make me like this?”
Elijah was a man who had the same human nature as we do. He prayed earnestly that it wouldn't rain, and it didn't rain on the earth for three and a half years.
These two witnesses have the power to close the sky so that it will not rain during the time of their prophecy. They also have the power to turn the waters into blood, and to strike the earth with all kinds of plagues, as often as they want.