111.   Heat will be tempered across parts of Missouri and middle Mississippi Valleys as thunderstorms erupt in clusters along the edge of the upper-level ridge.

112.   Heavy thunderstorms will erupt over the Southwest, fueled by humid air streaming northward from the Gulf of California and the tropical Pacific.

113.   Hit-or-miss potent thunderstorms will erupt later in the day across parts of Oklahoma and north Texas as humid Gulf air rams into an approaching cool front.

114.   However, if the lid is eroded during the day, heavier thunderstorms could erupt over northern and central Texas Friday afternoon and night.

115.   However, thunderstorms will again erupt during the afternoon from western Texas north to Wyoming.

116.   If the lid is weak and breakable, explosive, severe thunderstorms eventually erupt.

117.   In southern California, areas of stubborn fog and low clouds will shroud the coast, while isolated thunderstorms erupt over the hot deserts Thursday afternoon.

118.   In the humid wake south of the front, isolated severe thunderstorms will erupt across parts of Kentucky, Illinois and Indiana.

119.   In the West, late-day thunderstorms will again erupt in the higher terrain of the southern Rockies.

120.   Initially, it will be uncomfortably humid, but early next week, thunderstorms will erupt, signalling the start of the monsoon.