In mid-latitude areas, what weather condition often follows the appearance of a high-level lunar halo?
Answer
An approaching warm front signaling wetter conditions
The appearance of a lunar halo acts as an ancient, natural barometer because it signifies the presence of high-altitude cirrostratus clouds. In many mid-latitude regions, the advance of these high clouds often precedes the arrival of a warm front. This warm front carries deeper layers of moisture that are still high up but will eventually descend to lower altitudes, leading to the eventual onset of rain or snow, usually within the next day or so. Observing the halo provides an early indication that weather patterns are transitioning toward wetter conditions.
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