In the West, showers associated with a monsoon surge are primarily affecting parts of Arizona, Nevada, Utah, and western Colorado. The rain is slowing fieldwork but benefiting drought-stressed rangeland and pastures. Meanwhile in the Northwest, winter wheat planting is proceeding on schedule.
On the Plains, cooler air is overspreading Montana. Elsewhere, hot, mostly dry, breezy conditions are increasing the threat of wildfire activity and maintaining stress on rangeland and pastures. On September 9, nearly all (97%) of the rangeland and pastures were rated very poor to poor in Nebraska.
In the Corn Belt, dry weather accompanies a warming trend. In the eastern Corn Belt, pastures continue to benefit from recent soil moisture improvements. Meanwhile, crops are maturing rapidly, with corn harvest underway in all Midwestern States except Wisconsin. By September 9, the corn harvest had passed the halfway mark (53%) in Missouri, and was nearly one-sixth (15%) complete nationally.
In the South, dry weather favors summer crop maturation and harvest activities for crops such as corn, soybeans, cotton, peanuts, sorghum, and rice.
Outlook: The interaction between a cold front and a late-season monsoon surge will result in widespread showers and thunderstorms during the next several days in the Southwest, the central and southern Plains, and parts of the Midwest. Showers will also develop in the Gulf Coast region, but dry weather will prevail through week’s end from the Pacific Coast to the northern Plains. A brief cool spell will trail the cold front, but temperatures will quickly rebound to above-normal levels late in the week across the northern Plains and much of the West. The NWS 6- to 10-day outlook for September 16-20 calls for below-normal temperatures from the Rockies to the Mississippi Valley, while warmer-than-normal weather will prevail in the East and West. Meanwhile, near- to above-normal rainfall in the East will contrast with drier-than-normal conditions across most of the western two-thirds of the U.S.