Recent precipitation from remnants of Hurricane Polo has driven improvements across parts of the Southern Plains, reducing D3 and D4 coverage in states like Arkansas, while persistent dryness has expanded or maintained exceptional drought in areas such as northern Wisconsin, the Upper Peninsula of Michigan, Idaho, and Mississippi, according to the U.S. Drought Monitor data valid October 6, 2026. The National Drought Mitigation Center, NOAA, and USDA assessments show D4 now affecting roughly 1% of the contiguous U.S., with St. Thomas in the U.S. Virgin Islands newly classified at this level. Traders monitoring the week of October 13 should note the weekly USDM release expected around October 15, alongside the October 14 California-Nevada Drought & Climate Outlook Webinar, as steering patterns, soil moisture trends, and any additional rainfall will determine whether D4 persists or contracts in key states. Historical baselines indicate D4 remains uncommon outside prolonged multi-month deficits in the West and South.