bringing heavy rainfall to parts of western and southern Texas. Farther westward toward the Rio Grande Valley, a cutoff low pressure system became entrained into the second frontal boundary dropping southward across the central U.S. Southįrontal boundaries associated with a couple of strong low pressure systems over the Great Lakes brought heavy precipitation to parts of the Red River Valley of the South, the Ozarks, and the Tennessee Valley this week. However, some pockets that didn’t receive the heavier rainfall amounts earlier this month, coupled with antecedent dryness leading up to Ian’s second landfall in South Carolina, resulted in targeted areas of D0 introduction across parts of the Coastal Plain and Piedmont of the Carolinas. Parts of the Carolinas and Virginia continue to benefit from Hurricane Ian’s remnants from late September into early October. Elsewhere across the Gulf Coast states, 30-day deficits continued to increase, warranting another round of deterioration this week. Unfortunately, 30-day deficits of 1 to 2 inches still remain, even in areas receiving some of the heavier rainfall, warranting a status quo depiction in locations adjacent to areas showing improvement this week. 1-category improvements were warranted where 7-day rainfall totals in excess of 2 inches were able to eliminate 30-day deficits. Fortunately, beneficial heavy rainfall was observed across many areas in the Deep South and parts of the Tennessee Valley. Large precipitation deficits have accumulated in many areas of the Southeast over the last 30 days, particularly across the southern Appalachians and much of the Gulf Coast states. So these areas will need to be watched in the coming weeks. Some areas in western New York and south-central Pennsylvania have seen deficits creep up to between 1 and 3 inches over the past 30 days. Given the recent beneficial rainfall in many of these same areas, widespread 1-category improvements to the drought depiction were warranted. Widespread 1 to 2 inch rainfall surpluses were observed across New England, with more than 4 inch surpluses in central and western Maine. NortheastĪ couple of low pressure systems with trailing frontal boundaries resulted in another round of improvements to long-term drought conditions across New England and the Mid-Atlantic. Therefore, a widespread mix of improvements and deterioration was warranted in many locations where the heaviest precipitation did and did not fall, respectively. Across the eastern half of the lower 48, frontal boundaries associated with a couple of strong low pressure systems in the Great Lakes brought heavy precipitation and cooler than normal temperatures to portions of the Great Lakes, Northeast, and Southeast. This resulted in improvements to long-term drought conditions across parts of the Four Corners, with targeted improvements in the Southern Plains. Parts of the Four Corners and Desert Southwest were the exception to this, as an area of low pressure meandered across the Southwest before being picked up by a frontal boundary dropping southward across the central U.S. In addition to the above-normal temperatures, precipitation was also lacking for most areas from the Central and Northern Plains westward to the Pacific Coast, warranting drought deterioration. The Intermountain West and Pacific Northwest experienced the largest positive temperature anomalies, where widespread temperatures averaged 5☏ to 10☏ above-normal, with a few pockets exceeding 10☏ above-normal for the week as whole. Much of the western half of the lower 48 states observed above-normal average temperatures this week.
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