...Spain and Portugal...
Both instability and deep layer shear are forecast to increase compared to previous days, shear from moderate to high values (15-25 m/s 0-6 km and 1-8 km) and also low level shear from weak to moderate (8 m/s) to strong in the evening over the western parts (GFS18Z forecast >10 or 12 m/s). SREH3 is progged to reach over 250 m2/s2 over southeastern Spain during the afternoon. Abundant deep convergence should be present, but mid level QG support will switch from positive to slightly negative during the late afternoon... this may prevent to some extent development of a large MCS... but not too sure about that.
Main convective mode seems long-lived multicell and especially supercell storms with a chance of large hail, and some severe gusts. Chances for a tornado are more enhanced in/towards Portugal where low level shear would be better, though not fenomenal.
One or a few MCSes are possible during the evening, posing a main threat of severe gusts.