1.   But, there is no meteorological basis for these so-called equinoctial storms.

2.   However, no meteorological basis exists for these storms.

3.   However, there is no meteorological basis for these so-called equinoctial storms.

4.   In fact, there is no meteorological basis for these so-called equinoctial storms.

5.   No meteorological basis, however, exists for these storms.

6.   There is no meteorological basis, however, for these so-called equinoctial storms.