A series of cold fronts will result in a gradual cooling trend across the Plains and Midwest, according to USDA's Joint Ag Weather Facility. In addition, the fronts will sweep away tropical moisture associated with the remnants of Hurricane Isaac, and result in scattered showers across the Plains and widespread rainfall from the Midwest into the East.
Five-day rainfall totals could reach 1 to 3 inches, with locally higher amounts, from the middle Mississippi Valley into the Northeast. Similar amounts can be expected in parts of the central and southern Appalachians, lower Southeast, and Southwest.
The NWS 6- to 10-day outlook for September 9-13 calls for near- to above-normal temperatures nationwide, except for cooler-than-normal conditions in the Southeast and along the Pacific Coast. Meanwhile, near- to below-normal rainfall across the majority of the U.S. will contrast with wetter-than-normal weather in the Northeast and parts of the Southwest.
In the West, mostly dry weather accompanies late-summer warmth. Isolated showers are confined to the Southwest. Fieldwork activities include late-season spring wheat harvesting in the Northwest.
On the Plains, cooler air is overspreading Montana, but hot, mostly dry conditions persist across the remainder of the region. Today’s high temperatures will exceed 100°F as far north as Kansas. Meanwhile, portions of the northern High Plains are experiencing a heightened risk of wildfire activity due to dry, windy conditions.
In the Corn Belt, recent rainfall associated with the remnants of Hurricane Isaac provided drought relief in Missouri, Illinois, Indiana, and Ohio. Soil moisture improvements are especially beneficial for pastures and in preparation for soft red winter wheat planting. Currently, a few tropical showers linger across the eastern Corn Belt, while showers and thunderstorms in the vicinity of a weak cold front stretch from Michigan to Missouri.
In the South, hurricane recovery efforts continue in the central Gulf Coast region, including southeastern Louisiana and southern Mississippi. Currently, scattered thundershowers in parts of the Southeast are heaviest in Alabama and western Florida. Hot weather has returned to the Mid-South, including Arkansas, where today’s high temperatures will reach or exceed 100°F in many locations.