Delmarva will experience unseasonably warm and humid conditions through Thursday, with highs in the upper 70s to mid-80s and dew points in the 70s. Scattered showers and isolated severe storms are possible Thursday PM, with the Storm Prediction Center placing the entire peninsula under a marginal risk for damaging winds. Rainfall totals could reach 1 to 2 inches before a cold front moves through by late week.
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A tropical air mass and slow-moving front will keep daily rounds of thunderstorms and warm, muggy nights in place through early Friday.
Seasonably warm and increasingly humid conditions will build across Delmarva Sunday afternoon as high pressure shifts offshore. Highs will reach into the 80s to near 90, with an isolated thunderstorm possible by evening. By Monday and into midweek, a tropical air mass will set the stage for daily rounds of showers and thunderstorms. Some storms could produce heavy rainfall, localized flooding, and dangerous heat indices approaching 100 degrees inland.
High pressure offshore will usher in warmer and more humid air over Delmarva on Sunday, with highs climbing into the 80s to near 90 and muggy nights returning. While most areas should remain dry through Sunday, an isolated thunderstorm cannot be ruled out. By Monday and into the rest of the week, tropical moisture and unstable conditions will bring daily chances for showers and thunderstorms, some capable of heavy rainfall and localized flooding.
Pleasant weather will continue Saturday night across Delmarva, with partly cloudy skies and lows in the 60s. As high pressure shifts offshore, temperatures and humidity will climb Sunday into Monday. By early next week, a tropical and unsettled pattern will bring daily chances of showers and thunderstorms, heavy rainfall, and heat indices over 100 degrees.
A strong high-pressure system building over the Mid-Atlantic will bring dangerously hot and humid conditions to Delmarva starting Monday. Heat index values are forecast to soar between 100 to 110 degrees through Tuesday, with only slight relief expected by midweek. Heat Advisories remain in effect, with an Extreme Heat Watch issued for parts of southern Delmarva. Rain chances and cooler temperatures return by late week.
Strong storms and a cold front Thursday evening will offer a brief break from the heat, but Sussex County will see rising temperatures and humidity again through the weekend into next week.