In the West, out-of-season showers are occurring in parts of northern and central California and the Great Basin. Warmth prevails in the Rockies, but cool weather has returned to the Great Basin and the Pacific Coast States. Breezy weather is hampering wildfire containment efforts in parts of the Southwest.

On the Plains, thunderstorms continue to provide limited drought relief across southern areas, mainly in parts of Oklahoma. However, extreme heat persists on  the central and southern High Plains, where today’s high temperatures may approach 110°F. Meanwhile, favorably warm weather is promoting crop growth and final planting efforts on the northern Plains.

In the Corn Belt, cool weather lingers across the Great Lakes region, but sunny, mild conditions elsewhere are ideal for soft red winter wheat harvesting and rapid corn and soybean growth.

In the South, beneficial showers linger across the southern Atlantic States, particularly in Florida. Tropical Storm Arlene, centered over the southwestern Gulf of Mexico, poses no threat to the U.S.

Outlook: Tropical Storm Arlene will make landfall along Mexico’s Gulf Coast on Thursday. U.S. impacts will be confined to Deep South Texas, where scattered showers may occur. Meanwhile, showery weather will persist for the next several days across Florida’s peninsula. Much of the remainder of the U.S. will experience only scattered showers, with 5-day rainfall totals generally less than an inch. However, portions of the Southwest will begin to experience some shower activity associated with the monsoon onset. Elsewhere, cool weather will return to the northern Plains by week’s end, while extreme heat will shift eastward from the central and southern High Plains to the Mid-Atlantic States. The NWS 6- to 10-day outlook for July 4-8 calls for near- to above-normal temperatures nationwide, except for cooler-than-normal conditions in the Great Lakes region. Meanwhile, near- to above-normal rainfall across much of the eastern two-thirds of the U.S. will contrast with drier-than-normal weather in the Far West.