Heat and humidity join Friday to foreshadow thunder and lightning that may follow

In the winter in Washington, we often worry about snow, but on some summer days, like Friday, we worry about the threat of rain.
Gray clouds piled up throughout the day, reinforcing foreshadowing and confirming predictions of a gathering storm. Warnings cited the possibility of heavy rain in some places along with flooding.
https://www.washingtonpost.com/local/heat-humidity-join-friday-to-suggest-thunder-lightningt-may-follow/2022/07/08/138c2528-ff1b-11ec-a07f-799ab6d06557_story.html Heat and humidity join Friday to foreshadow thunder and lightning that may follow