Central and Southeast Montgomery storm history

Heat index values exceeded 110 degrees. A 32-year old woman died of hyperthermia while hiking the Billy Goat Trail near Potomac Maryland.

A mesonet in Cabin John, MD measured a peak wind gust of 61 mph at 1602 LST.

Coldest apparent temperatures/wind chills overnight into morning hours.

Several mesonets in the county measured peak heat indices between 105 to 110.

The AWOS at Gaithersburg Airport (KGAI) measured a peak heat index of 110. Several mesonets in the county measured peak heat indices around 110.

A Maryland Department of Transportation mesonet, MD-001, located at the intersection of Interstate 270 and Interstate 370, measured heat indices as high as 111F. Several other mesonets across Central and Southeastern Montgomery County measured peak heat indices in excess of 110F.

A mesonet station at Cabin John, MD measured a peak wind gust of 65 mph at 1949LST.

Heat indices rose to between 105 and 110 degrees.

Canadian high pressure, clear skies and light winds allowed widespread freezing temperatures to occur late at night and early in the morning.

A Canadian high pressure, light winds and clear skies resulted in widespread freezing temperatures late at night through early in the morning.

Wintry precipitation continued at times into February 2nd.

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

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.

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.

Numerous trees were down throughout southeastern Montgomery County. There was an injury due to a tree down on an occupied vehicle near the intersection of West Lake Drive and Tuckerman Lane.

Visibility was around one-quarter mile.