Dangerous heat and humidity will grip Delmarva today and Friday, with heat index values climbing as high as 95 to 105 degrees and record highs possibly being challenged in Georgetown. Scattered strong to severe thunderstorms are also possible both afternoons and evenings, with damaging winds the main concern. A cold front late Friday will bring less humid air for the weekend, followed by another chance of showers and storms Sunday night and more seasonable weather next week.