Strong El Niño conditions, with Niño 3.4 indices near +1.8 °C and strengthening, are the dominant driver shaping market odds near 45% for 10 or more states in D4 by early September. Current U.S. Drought Monitor data valid August 25 show D4 areas concentrated across the Pacific Northwest, northern Rockies, central and southern Great Plains, and pockets of the Southeast, already affecting roughly a dozen states amid 47.5% national drought coverage. NOAA seasonal outlooks favor drought persistence and expansion in the Northwest and northern Plains through the period due to above-normal temperatures and below-normal precipitation, while enhanced monsoon moisture supports improvement across the Southwest and Rockies. Reduced Atlantic tropical activity linked to El Niño adds uncertainty for Southeast states. With the September 1 map reflecting conditions only days away, traders weigh the balance between ongoing western persistence and potential short-term relief or expansion signals from the latest model guidance.