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White fluffy clouds, known as cumulus clouds, do not bring rain on their own. Rain typically falls from higher-level clouds such as nimbostratus or cumulonimbus clouds, which have more moisture and larger vertical development. Cumulus clouds may eventually develop into rain-producing clouds if they continue to grow and merge with other clouds.
No, clouds in the ionosphere do not cause rain. The ionosphere is a region in the Earth's atmosphere where particles are ionized by solar radiation, and it's located much higher than where clouds form in the troposphere. Rain is produced when water droplets in clouds grow large enough to fall to the ground due to gravity.
Cumulus clouds usually indicate fair weather. However, if they start to grow taller and develop into cumulonimbus clouds, it could signal thunderstorms or rain showers.
Rain forms when water droplets in clouds combine and grow large enough to fall to the ground. These water droplets typically come from condensation of water vapor in the air, which collects in the clouds and eventually falls as rain when the droplets become heavy enough.
Clouds in a thunderstorm typically signal the presence of convection and moisture in the atmosphere. Thunderstorm clouds, or cumulonimbus clouds, can grow to great heights and produce heavy precipitation, lightning, and thunder. These clouds are often associated with strong updrafts and downdrafts that contribute to severe weather conditions.