The Southwest: A plume of tropical moisture triggered scattered monsoon showers. Some of the most widespread rain fell from southeastern Arizona into northeastern New Mexico and southeastern Colorado. However, only minimal changes were introduced, as the rain provided only limited and localized relief from a serious drought situation. On July 24, USDA rated 89% of New Mexico’s rangeland and pastures in very poor to poor condition.
Puerto Rico, Hawaii, and Alaska: No changes were introduced in Puerto Rico (no dryness or drought), Hawaii, or Alaska. Hawaii is currently in the midst of its dry season; long-term rainfall deficits persist across portions of the central and eastern Hawaiian Islands. Meanwhile, patchy dryness lingered across south-central and southeastern Alaska.
Looking Ahead: During the next 5 days (July 28 – August 1), Tropical Storm Don will cross the Gulf of Mexico, contributing to late-week rainfall in the central and western Gulf Coast States. The degree of drought relief provided by Don will depend upon the storm’s intensity, as well as the track and forward speed. Meanwhile, the Southwestern monsoon circulation interacting with a cold front will produce widespread showers and thunderstorms from the Four Corners region into the northern Plains, Midwest, and Northeast. Showers will increase in coverage over the Southeast, but hot, mostly dry conditions will persist from the southern Plains into the Ohio Valley and northern Mid-Atlantic region.
The CPC 6- to 10-day outlook for August 2-6 calls for hotter-than-normal weather east of a line from New Mexico to Minnesota, excluding New England, while below-normal temperatures will be confined to the northern Rockies, northern California, and the Pacific Northwest. Meanwhile, wetter-than-normal conditions will arc across the Four Corners region, northern Plains, Midwest, Ohio Valley, and southern Mid-Atlantic States, but the remainder of the U.S. will experience near- to below-normal rainfall.