Eastern Loudoun storm history

The AWOS at Leesburg Regional Airport, KJYO, observed a peak heat index around 110F.

The AWOS at Leesburg Regional Airport, KJYO, observed a peak heat index around 110F.

The ASOS at Washington Dulles International Airport, KIAD, measured a peak wind gust of 62 mph at 1539LST.

Coldest apparent temperatures/wind chills overnight into morning hours.

A mesonet at George Washington University Northern Virginia Campus measured measured heat indices as high as 111F. Numerous other mesonets in Eastern Loudoun County measured heat indices in excess of 110F.

Loudoun County 911 center received more than two dozen reports of trees and power lines downed by the strong gradient winds across the county.

Heat indices rose to between 105 and 110 degrees.

Heat indices rose to between 105 and 110 degrees.

Light winds and plentiful low level moisture allowed areas of dense fog to form late on the 24th. The fog dissipated just after dawn on the 25th.

Light winds and excessive low level moisture allowed areas of dense fog to form during the evening of the 28th. The fog dissipated before dawn on the 1st.

VA-621 Bull Run Post Office Road was closed due to ice from freezing rain and an accident between Hollyspring Lane and Sudley Road around 9 PM on the evening of the 18th. There were also multiple accidents from icy roads on VA-643 between VA-659 and VA-653.

Wintry precipitation continued at times into February 2nd.

Light winds and residual moisture allowed fog to develop in the evening of January 26th. The fog dissipated early on January 27th.

Dense fog developed early in the morning, with widespread visibility of 1/4 mile or below. Fog dissipated towards noon.

Visibility dropped to 1/4 mile for several hours.

Canadian high pressure allowed temperatures to drop to freezing or below, ending the 2020 growing season.

Areas of dense fog developed across the region after midnight on the 23rd, with widespread visibility below 1/4 mile. The fog dissipated by 10 AM.

Areas of dense fog developed across the region after midnight on the 22nd, with widespread visibility below 1/4 mile. The fog dissipated by 11 AM.

Light winds and plentiful low level moisture led to widespread dense fog. The fog dissipated towards late morning.