Overview
- The Weather Prediction Center says parts of the Midwest and Lower Ohio Valley face likely overnight flash flooding with training storms producing rainfall rates of 1–3 inches per hour and spot totals of 3–6+ inches.
- Multiple WPC mesoscale discussions and high‑resolution guidance point to backbuilding convection over saturated soils in urban corridors, raising the risk of rapid runoff, overwhelmed drains, travel disruptions, and life‑threatening flooding.
- The Storm Prediction Center highlights isolated damaging wind gusts up to about 60 mph and marginal hail in the Mid‑Atlantic and Southeast, and it placed portions of eastern Georgia and much of South Carolina at about a 40 percent chance of a severe watch being needed.
- Deep Gulf moisture will fuel repeated rounds of heavy rain across the lower Mississippi Valley and Texas while a large Saharan dust plume will create hazy skies, reduce air quality, and raise the chance of dust‑stained ‘blood rain’ where heavy showers fall through the dust.
- A strong upper‑level ridge is forecast to build into a midweek heat dome that will push widespread highs into the 90s and heat‑index values near or above 100°F across the Plains, Midwest and Great Lakes, increasing heat‑stress, power and public‑health concerns.