⛈️ Delmarva Weather Update — Thursday, August 20, 2026
Flood Watch for New Castle and Somerset Counties until 2:00 AM EDT August 21.
Today's Weather Story: A strong cold front crossing Delmarva will bring showers and thunderstorms through the day, with the highest rain coverage across northern Delaware and parts of the Maryland Eastern Shore. Storm chances remain lower—but still present—farther south and along the Atlantic coast, where some locations begin mostly sunny. Highs reach the low to upper 80s with generally light southerly to southwesterly winds.
Across Delmarva:
- Wilmington, DE: Showers and thunderstorms, high 83°F, east wind 0 to 5 mph.
- Dover, DE: Showers and thunderstorms likely, high 86°F, south wind 0 to 10 mph.
- Georgetown, DE: Chance of showers and thunderstorms, then showers and thunderstorms likely, high 88°F, southwest wind 0 to 10 mph.
- Lewes, DE: Chance of showers and thunderstorms, then showers and thunderstorms likely, high 87°F, south wind 5 to 10 mph.
- Cambridge, MD: Chance of showers and thunderstorms, high 87°F, south wind 3 to 10 mph.
- Salisbury, MD: Chance of showers and thunderstorms, high 87°F, south wind 2 to 10 mph.
- Ocean City, MD: Mostly sunny early, then a chance of showers and thunderstorms, high 82°F, southwest wind 5 to 15 mph.
- Chincoteague, VA: Mostly sunny early, then a chance of showers and thunderstorms, high 84°F, south wind 6 to 16 mph.
Active Weather Alerts:
- Flood Watch for New Castle and Somerset Counties until 2:00 AM EDT August 21.
Severe Weather Outlook: The SPC places Wilmington, Dover, Lewes, Salisbury, Ocean City, Chincoteague, and Cape Charles in a Slight Risk for severe thunderstorms today. The main severe-weather window is late this afternoon into tonight, with damaging wind gusts and a few tornadoes possible in the NWS discussion. WPC guidance also flags a possible excessive rainfall and flooding concern for Delmarva.
Why This Setup: A strong cold front is moving through while nearby low pressure, a stalled boundary, and tropical moisture feed into an upper-level disturbance. That combination supports repeated showers and thunderstorms rather than a quick, isolated round.
Looking Ahead: Conditions stay unsettled through the weekend, with daily shower and thunderstorm chances. Fairer, seasonable weather is expected to return early next week.
Bottom Line: Plan for thunderstorms at times today, especially north and central Delmarva, and be prepared for severe weather and localized flooding concerns.
— US Weather Warriors 🌪️ #DelmarvaWeather #DEwx #MDwx #VAwx