11.   More concentrated thunderstorms will form northeast of Florida, where an upper-level disturbance interacts with copious moisture.

12.   Noticeably cooler air will arrive across the northern Plains as a jet stream disturbance interacts with low pressure in the central Rockies.

13.   On Wednesday, this disturbance will interact with the front, bringing showers to portions of the Northeast.

14.   Patches of light snow will develop in the central high Plains as a weak disturbance interacts with moist winds ascending the terrain.

15.   Scattered showers and thunderstorms will form across the Southeast on Wednesday as a jet stream disturbance interacts with a moist flow of air from the Gulf of Mexico.

16.   Scattered thunderstorms, some with damaging winds and hail, will erupt across the lower Missouri Valley as a jet-stream disturbance interacts with a dissipating cool front.

17.   Severe thunderstorms will also boil up across parts of the western Gulf states as a potent disturbance interacts with tropical air.

18.   Showers and thunderstorms will dampen much of the southern Great Lakes Saturday as a jet stream disturbance interacts with two fronts.

19.   The storms will erupt as a potent jet stream disturbance pivoting east interacts with very humid air streaming north from the Gulf of Mexico.

20.   Thundershowers and embedded downpours will continue across Southern Florida as an upper level disturbance interacts with entrenched tropical air.