This Week’s Drought Summary
For much of the drought-monitoring period, the remnants of Hurricane Nicholas continued to produce heavy showers across the South. Toward the end of the period, residual tropical moisture was drawn northward in advance of a strong cold front, further enhancing rainfall in several areas. At the Tuesday morning (September 21) cutoff, rain was falling in several areas—including parts of the Midwest—that have been experiencing dryness or drought. Meanwhile, the Northwest also received some precipitation, including high-elevation snow, providing limited drought relief. In many sections of the country, however, dry weather favored summer crop maturation and harvesting, but reduced topsoil moisture for newly planted winter grains. Some of the most significant short-term dryness, aggravated by late-season heat, existed across the southern Plains. Mostly dry weather also prevailed across the nation’s southwestern quadrant, including central and southern California. Near- or above-normal temperatures covered much of the country, except briefly in the wake of the previously mentioned cold front.
The region remained a contrast between wetness in areas affected by the remnants of Hurricane Nicholas (and previous tropical systems) and rapidly developing dryness (D0) and moderate to extreme drought (D1 to D3) in Arkansas, Oklahoma, and Texas. According to the U.S. Department of Agriculture, topsoil moisture rated very short to short increased at least 10 percentage points during the week ending September 19 to reach 72% in Oklahoma and 69% in Texas. Broad deterioration of up to one category was observed across the driest areas. One of the driest spots was Tulsa, Oklahoma, where August rainfall totaled 0.78 inch (23% of normal) and September 1-21 precipitation stood at one-tenth of an inch (4% of normal). Tulsa also reported high temperatures of 90°F or greater on each of the last 26 days of August and first 20 days of September, but the 46-day streak finally ended with a high of 80°F on September 21. By September 19, USDA reported that winter wheat was 20% planted in Texas and 15% planted in Oklahoma; that crop will soon need rain to ensure germination and proper establishment.