About half of the first waves seen are part of the basing process and tend to be heavily corrected by Wave 2. Many people feel that this is one more opportunity to trade in the direction of the previous trend, and, if that was down, many will sell short. However, market breadth and volume will subtly increase.
The other 50% of first waves will rise from large basing price movement formed by the previous correction and these tend to be dynamic and only moderately retraced. This is a good probable spot to have a Wave 1 extension.