2. The Green Sky Phenomenon
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The emergence of a greenish hue in the sky is one of the most strikingly visually arresting and generally identifiable natural warning signals of an approaching tornado. Often referred to as a "green sky," this phenomena can show severe weather and possible tornado development. Although meteorologists still disagree on the precise reason of this green hue, it is usually ascribed to the way sunlight interacts with the composition of the storm clouds. A strong thunderstorm could have a high concentration of hail and water droplets. A setting or rising sun's reddish light passing through this abundant moisture can have a filtering effect that renders the sky green. Not all green sky lead to tornadoes, hence not all tornadoes are preceded by green sky. But this peculiar colouration is usually connected with very strong updrafts and very big hail, both of which are favourable for tornado development. If you see a green sky, particularly in relation with other warning signals, you should be vigilant and ready to find cover. Recall that the green sky phenomena is best noticeable during the daylight, especially in late afternoon or early evening when the sun is lower in the sky.
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