1. Start with a "D" handshape. Your dominant hand is in a "D" shape, with your thumb extended and your fingers curled inward.
2. Move your hand down, making a twisting motion. You move your "D" handshape down in front of your body, as if you are digging a hole. As you move your hand down, twist your wrist slightly.
3. Keep your hand at chest level. You finish the sign with your hand in front of your chest, still in the "D" handshape.
It's important to note that this sign is similar to the sign for "dry," but the twisting motion makes it clear that you're signing "drought."
If you have access to visual resources like videos or ASL dictionaries, those can be helpful in learning the correct sign and its nuances.