A dynamic and impactful dry lightning pattern will develop over portions of the West during the next 24-36 hours. Monsoon moisture increasing northward along the western periphery of the Four Corners High will fuel a significant increase in the coverage of dry thunderstorms over much of interior California, southeast Oregon, Great Basin, and the West Slope. Isolated sprinkles accompanied by a few lightning strikes cannot be ruled out for portions of California’s Central Valley and Central Coast during the morning while a few nocturnal dry thunderstorms are anticipated Saturday night into Sunday morning. Isolated dry thunderstorms are also possible over the northern Rockies especially along/east of the Divide in central Idaho, Wyoming, and south- central Montana. Isolated to scattered mainly wet thunderstorms are expected in the Southwest, favoring Arizona. Outside localized gusty winds associated with isolated showers or thunderstorms, breezy westerly winds combined very low relative humidity will continue to bring elevated to locally critical conditions across northeast California, eastern Oregon, central and southern Idaho extending into the northern Rockies. Meanwhile, the heat will continue to build across the Rocky Mountains expanding into the central and northern Plains, with very low relative humidity. Hotter temperatures will expand eastward into much of the Southeast and Mid-Atlantic as well. Thunderstorms with pockets of heavy rain will linger over parts of southern New England. Across Hawai’i, strong high pressure to the north of the islands will maintain breezy to locally strong trade winds through the weekend. A mostly dry pattern is expected with some brief/light showers possible for windward/Mauka areas. A strong upper-level low will dominate Alaska, especially the west, bringing more widespread wetting rains to the region.