Showers in the mid-Atlantic states on Monday brought some roll clouds to parts of Virginia and Maryland.
According to AccuWeather.com Expert Senior Meteorologist Henry Margusity, roll clouds are the result of an outflow of cold air after a bout of rain.
"A shower or thunderstorm forms, and then cool air follows behind it," Margusity said. "As the cool air rushes out, warm air moves in on top of it."
Condensation along the meeting point between the cool air and the warm air result in these roll clouds. Take a look at these roll clouds that were seen on Sept. 16.
A roll cloud spotted in Waldorf, Md., Sept. 16. Photo by AccuWeather Facebook fan Silvie Rivera.
A view of a roll cloud in Herndon, Va. Photo by Judi Ferrara.
A closer shot of the Herndon, Va., roll cloud. Photo by Judi Ferrara.
Panoramic shot of a roll cloud taken by NWS Sterling, Va.
Following a dry end to the holiday weekend, showers and thunderstorms will quickly return to the Northeast during the first part of the new week.
The unrelenting heat across the interior West will continue through the first part of the new week, but there is a light at the end of the tunnel.
After blowing through Guam over the weekend with up to 304.8 mm (12 inches) of rain, Chan-hom has its eye set on intensification as it tracks toward Japan's Ryukyu Islands and eventually east-central China.
Severe thunderstorms will ignite from Minnesota to northeastern Colorado into Sunday night. Storms will extend from upper Michigan to northwest Texas on Monday.
A 21-year-old California woman died recently after contracting a rare infection caused by a brain-eating amoeba that thrives in warm bodies of water.
An uptick in tropical activity is likely around Hawaii and then near the shores of Mexico as July progresses.
Moorhead, MN (1936)
114 degrees -- highest ever recorded in Minnesota.
Raleigh, NC (1975)
First of 11 straight days with measurable rain; longest streak on record. Total rainfall: 6.18 inches.
Saylersville, KY (1981)
Over 5 inches of rain in 36 hours; 9 feet of water in parts of the town; people evacuated.