Low-level moisture was trapped underneath the nocturnal inversion. Breaks in the clouds caused radiational cooling, which led to areas of dense fog.

Dense Fog in NELSON, VIRGINIA
From 25-JUL-18 23:53:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in ALBEMARLE, VIRGINIA
From 25-JUL-18 23:53:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in ORANGE, VIRGINIA
From 26-JUL-18 02:15:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in FREDERICK, VIRGINIA
From 26-JUL-18 03:18:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in CLARKE, VIRGINIA
From 26-JUL-18 03:18:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in RAPPAHANNOCK, VIRGINIA
From 26-JUL-18 03:55:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in CULPEPER, VIRGINIA
From 26-JUL-18 03:55:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in NORTHERN FAUQUIER, VIRGINIA
From 26-JUL-18 04:35:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in SOUTHERN FAUQUIER, VIRGINIA
From 26-JUL-18 04:51:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in WESTERN LOUDOUN, VIRGINIA
From 26-JUL-18 04:55:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in PRINCE WILLIAM, VIRGINIA
From 26-JUL-18 04:56:00 to 26-JUL-18 08:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in GREENE, VIRGINIA
From 25-JUL-18 23:53:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in NORTHERN VIRGINIA BLUE RIDGE, VIRGINIA
From 25-JUL-18 23:53:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in ROCKINGHAM, VIRGINIA
From 26-JUL-18 00:55:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in SHENANDOAH, VIRGINIA
From 26-JUL-18 00:55:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in PAGE, VIRGINIA
From 26-JUL-18 00:55:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in AUGUSTA, VIRGINIA
From 26-JUL-18 01:15:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in WESTERN HIGHLAND, VIRGINIA
From 26-JUL-18 01:15:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in EASTERN HIGHLAND, VIRGINIA
From 26-JUL-18 01:15:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in CENTRAL VIRGINIA BLUE RIDGE, VIRGINIA
From 26-JUL-18 01:15:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.

Dense Fog in MADISON, VIRGINIA
From 26-JUL-18 02:15:00 to 26-JUL-18 07:00:00 (EST-5)
Reported by: AWOS

Visibility was around one quarter mile based on observations nearby.