This Week's Drought Summary (7/30)

July 30, 2020

High pressure dominated the southern half of the contiguous U.S. (CONUS) again during this U.S. Drought Monitor (USDM) week. Upper-level weather systems tracked across the U.S.-Canadian border, dragging surface lows and fronts along with them. The High brought hot temperatures to much of the South, East, and West, with daily maximum temperatures exceeding 90 degrees F every day. The fronts brought cooler temperatures to the Upper Midwest at the beginning of the week, but maximum temperatures began to exceed 90 degrees across the Plains and eastward as the week wore on. The hot temperatures increased evapotranspiration (ET) which dried soils and stressed crops and other vegetation. This was seen in ET models such as the EDDI and ESI and several soil moisture models, satellite observations of soil moisture, and agricultural field reports. As noted by the U.S. Department of Agriculture (USDA) on July 27, 50 percent or more of the topsoil moisture was short or very short (dry or very dry) in states across the Northeast, Midwest, Southeast, southern Plains, southern to central Rockies, and Far West. For the nation as a whole, 37 percent of the topsoil moisture and 35 percent of the subsoil moisture was short or very short, and 30 percent of