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News: At least 111 people died after a powerful storm and heavy rain hit several districts of Uttar Pradesh recently.
About Thunderstorms
- Thunderstorms are common weather events that form when warm moist air rises, cools, and condenses into towering cumulonimbus clouds.
- Formation: According to the National Weather Service, three conditions must exist together for a thunderstorm to develop:
- Moisture: Moisture is necessary for cloud formation and heavy precipitation.
- Instability: Warm air near the surface keeps rising rapidly because it remains warmer than the surrounding upper atmosphere.
- Lift: A lifting mechanism such as solar heating, mountains, or cold and warm fronts pushes the air upward.
- Life Cycle: A thunderstorm generally passes through three stages and usually lasts from 30 minutes to one hour.
- Developing Stage: Warm moist air rises continuously and forms towering cumulus clouds.
- Strong updrafts dominate this stage, but rainfall is very limited.
- Occasional lightning flashes may occur.
- Mature Stage: Water droplets become too heavy for the updrafts to hold, and precipitation begins to fall.
- Cool downdrafts spread along the ground and form gust fronts.
- This stage is the most dangerous because it can produce heavy rain, hail, lightning, strong winds, tornadoes, and frequent thunder.
- Dissipating Stage: The cool downdraft weakens the rising warm air and cuts off the storm’s supply of moisture.
- Rainfall gradually decreases, although lightning may still remain dangerous until the storm completely ends.
- Developing Stage: Warm moist air rises continuously and forms towering cumulus clouds.
- Structural Classification: Thunderstorms are classified into four main types based on their structure, intensity, and duration.
- Single-Cell: These are small and short-lived storms that generally last for 20–30 minutes and mainly produce light to moderate rainfall.
- Multi-Cell: These storms contain several storm cells at different stages of development, allowing them to continue for many hours with heavy rain, gusty winds, and occasional hail.
- Squall Line: These storms form long organized lines, usually along cold fronts, and produce strong winds, heavy rainfall, and sometimes tornadoes over large areas.
- Supercell: These are the most severe thunderstorms with a rotating updraft called a mesocyclone, capable of producing large hail, destructive winds, flash floods, and tornadoes.
