Overview
- Multiple Storm Prediction Center mesoscale discussions on Sunday said severe thunderstorm watches were needed across the Ohio Valley into the Mid‑Atlantic and Northeast because organized storms were developing with a primary threat of damaging straight‑line winds.
- The Weather Prediction Center issued a mesoscale precipitation discussion for late Sunday noting a localized urban flash‑flood risk for southeastern Pennsylvania, northern Delaware and central to southern New Jersey from short‑term rainfall rates of about 1 to 1.5 inches per hour.
- SPC products and local forecasts described peak wind gusts commonly forecast in the 55–70+ mph range and warned that lines or clusters could produce swaths of wind damage and isolated tornadoes as convection moves eastward.
- Forecast centers say the situation will evolve into a multi‑day severe outbreak that shifts into the Midwest and Great Lakes midweek, with a Level 3 severe risk centered near Kansas City–St. Louis and widespread 2–3 inch rainfall expected in places.
- In India the India Meteorological Department upgraded warnings for Delhi to red and reported measured gusts near 92 km/h at Palam on Monday while forecasting continuing monsoon advance and a mix of heat, thunderstorms and gusty winds across Vidarbha.