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Reagan National Airport runs warm for late October
October 29, 2026
Washington Reagan National Airport, 16 km from Piedmont Uplands, recorded mean daily highs averaging 72.8°F over the past 30 days, 3.2°F above the 1991-2020 normal of 69.6°F. Above-normal warmth has persisted through late October.
Water near Great Falls tests acidic
October 29, 2026
Water near Great Falls measured pH of 6.2 units on October 29, below the EPA freshwater reference range of 6.5–9, indicating acidic conditions. Acidic water can stress sensitive aquatic organisms, though dissolved oxygen near 5 mg/l remains within the EPA aquatic life criterion.
Sweetgum leaves turning and dropping in Piedmont Uplands
October 29, 2026
observed with colored leaves and falling leaves on 2026-10-28 in the Piedmont Uplands region. Deciduous trees continue through active senescence phase with mean daily temperatures running 3.2°F above the 1991-2020 normal, which maintains conditions favoring accelerated anthocyanin production and leaf drop.
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