Widespread dense fog blanketed southern Illinois during the late night and early morning hours. Heavy rainfall from thunderstorms the previous afternoon saturated the ground, which contributed to high humidity. During the night, light winds and periods of clear sky under an upper-level high were conducive for the formation of dense fog. Visibility below one-quarter mile was common, and a trained spotter near Mount Vernon reported less than a tenth of a mile in some areas.

Dense Fog in ALEXANDER, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in EDWARDS, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in FRANKLIN, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in GALLATIN, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in HAMILTON, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in HARDIN, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in JACKSON, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dense Fog in JEFFERSON, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in JOHNSON, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in MASSAC, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in PERRY, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in POPE, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in PULASKI, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in SALINE, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in UNION, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in WABASH, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in WAYNE, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in WHITE, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Dense Fog in WILLIAMSON, ILLINOIS
From 11-MAY-16 00:00:00 to 11-MAY-16 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS