Why Do Raindrop Sizes Matter In Storms?

Released Thursday, March 31, 2016

ID: 12182

- Produced by:
- Joy Ng

Not all raindrops are created equal. The size of falling raindrops depends on several factors, including where the cloud producing the drops is located on the globe and where the drops originate in the cloud. For the first time, scientists have three-dimensional snapshots of raindrops and snowflakes around the world from space, thanks to the joint NASA and Japan Aerospace Exploration Agency Global Precipitation Measurement (GPM) mission. With the new global data on raindrop and snowflake sizes this mission provides, scientists can improve rainfall estimates from satellite data and in numerical weather forecast models, helping us better understand and prepare for extreme weather events.

Watch this video on the NASA Goddard YouTube Channel.

Complete transcript available.

This is a conceptual animation showing how the size and distribution of raindrops varies within a storm.

The animation travels from the top to the bottom of a storm. Blues and greens represent small raindrops that are 0.5-3mm in size. Yellows, oranges, and reds represent larger raindrops that are 4-6mm in size. A storm with a higher ratio of yellows, oranges, and reds will contain more water than a storm with a higher ratio of blues and greens.

Credit: NASA's Goddard Space Flight Center/Conceptual Image Lab

This is a high-resolution conceptual image showing the distribution of different sized raindrops within a storm. Blues and greens represent raindrops between 0.5-3 mm in size and yellows, oranges, and reds represent raindrops between 4-6mm in size.

Credit: NASA's Goddard Space Flight Center/Conceptual Image Lab

A GIF optimized for posting on Twitter.

This shows the distribution of different sized raindrops within a storm. Blues and greens represent raindrops between 0.5-3 mm in size and yellows, oranges, and reds represent raindrops between 4-6mm in size.

A GIF optimized for posting on Twitter.

Many small raindrops can be found near the top of a storm whereas bigger raindrops can be found in the middle and bottom. NASA's GPM satellite is measuring the size and distribution of raindrops globally.