Overnight 21/22 February fog and low cloud formed over the United Arab Emirates, causing Dubai Airport to be closed.
Poor horizontal visibility caused the re-routing of 15 flights that had been on their way to Dubai International Airport.
Other less extended fog patches can also be observed over Qatar and the Strait of Hormuz.
The clouds/fog only dissolved in the afternoon of 22 February.
More information and detailed analysis of the feature can be found in the In Depth section.
by HansPeter Roesli (Switzerland)
Essentially there are three standard RGB products that allow for monitoring the evolution of fog and low cloud.
Figure 1: Night Cloud Microphysics RGB
At night the Night Cloud Microphysics RGB shows the fog and low cloud as whitish patches that contrast very well with the land and water surfaces in the background.
However, as soon as the first rays from the Sun reach the cloud tops the colour changes to pinkish-blueish shades that still stand out over water. This is due to the superposition over reflected sunlight over the IR signal in the IR3.9 channel used in this RGB.
Over land the contrast weakens considerably, but the feature can still be tracked in the animated image sequences.
Figure 2: Natural Colour RGB
The Natural Colour RGB, being based on solar reflection only, is limited to daytime, where it shows excellent contrast right from sunrise onward.
Also, smaller patches over Qatar and the Strait of Hormuz are rendered very well.
Figure 3: Dust RGB
The Dust RGB, where the IR3.9 channel used in the Night Microphysics RGB is replaced by IR8.7, may be considered as a compromise of the two RGBs discussed above.
Fog and low cloud appear in greyish-pinkish shades that at night and in the day contrast well with the water-land background. Smaller and/or thinner patches tend to get lost though, e.g. those over Qatar and the Strait of Hormuz.
Again the animation can be of considerable help.