Climatology

A satellite imager of an anvil cloud formation over the ocean.

Satellite Imagery of Clouds

Caitlin Dempsey

Listed here are different clouds formations as seen on satellite imagery.

Map showing the NDVI anomaly in 2024 compared to average levels from 1991 to 2020). After a couple of years of above average precipitation in Southern California, vegetations levels in the summer of 2024 were 30% greener than average. Map: NASA, public domain.

Hydroclimate Whiplash: the Impact on California Wildfires

Caitlin Dempsey

Hydroclimate whiplash - the rapid swing between drought and heavy precipitation - plays a role in the increasing intensity of California wildfires.

Lenticular clouds over a mountain range.

Lenticular Clouds

Caitlin Dempsey

Lenticular clouds are lens-shaped formations that form over mountains when moist air cools and condenses, creating smooth, often UFO-like cloud patterns.

Gravity wave clouds over a forest on a bright sunny day.

How Undular Bores Show Up in the Clouds

Caitlin Dempsey

Undular bores create distinctive wave-like cloud patterns, such as morning glory clouds, by pushing warm air upward.

A map of the southwest region of the US showing in deep red extreme heat across the area.

Mapping Heatwaves from Space: How Extreme Temperatures Are Modeled

Caitlin Dempsey

The Goddard Earth Observing System (GEOS) model can help researchers predict and map heatwaves around the world.

A weather model with a yellow to greens color gradient showing wind speed.

Weather Forecasting Using Artificial Intelligence

Mark Altaweel

GraphCast is a Google DeepMind effort that uses deep learning to improve medium-range weather forecasting.

Two maps - the top has a deep blue to deep red raster temperature layer for an area in South Africa and the bottom has deep blue to deep red dots to represent individual elephant locations with temperature sensors.

Using Animals to Collect Weather Data

Caitlin Dempsey

Attaching sensors to wildlife could give scientists fine-scale weather data from the habitats animals move through.

Three side-by-side satellite images showing the emergence of an ephemeral lake in Badwater Basin.

North America’s Lowest Point on Land is Currently a Lake

Caitlin Dempsey

Two recent heavy rainfall events have filled Badwater Basin, the lowest point in North America on land, up with water.

A dark photo taken at night showing lightning and a purple sky around the lightning.

Geography of Lightning Strikes in the United States

Caitlin Dempsey

Researchers recently mapped out data from the U.S. National Lightning Detection Network (NLDN) between 2017 and 2022 to see where lightning strikes the most across the contiguous United States.

A map showing moisture levels carried by an atmospheric river over the West Coast including California. High moisture levels are a dark blue-green and low moisture levels are brown.

What is the Outlook for California’s Atmospheric Rivers?

Caitlin Dempsey

During the winter months, atmospheric rivers carry enormous amounts of water to the state of California.

An oblique view of Hawaii showing two snow-capped volcanoes.

Snow in Hawaii

Caitlin Dempsey

Hawaii may be in the tropics, but it gets snow every year.

An AI generated closeup of a red, orange, and yellow fall leaves with a dusting of snow.

What is Snowliage?

Caitlin Dempsey

Snowliage is when an early winter storm creates a bright white snowfall that contrasts with the red, oranges, and yellow fall foliage of trees.

Black and white graph showing the change in global temperatures against the average from 1951 to 1980.

When Will We Reach the 1.5°C Mark with Climate Change?

Mark Altaweel

The Earth is 1°C warmer than pre-industrial times, and it's unclear when we'll reach the 1.5°C climate threshold.

A visualized view of the Earth looking at the Arctic in 2023.

Using Satellites to Map Arctic Amplification

Caitlin Dempsey

Scientists are using remotely sensed data from Earth observation satellites to map and study Arctic amplification.

Animated gif showing sea surface temperature patterns across the Pacific Ocean with colder waters in blue and warmer waters in orange and red.

El Niño Has Arrived

Caitlin Dempsey

After a triple dip of La Niña conditions spanning three years, researchers have officially declared the onset of El Niño on June 8, 2023.

A view of dark clouds over some urban buildings with blue sky in the background.

Cities are Changing Cloud Formations

Mark Altaweel

Researchers looked at cloud patterns over urban areas for 447 cities in the United States using satellite imagery.

A satellite image showing snow covering areas of Ohio, Pennsylvania, and New York just south of Lake Erie.

Lake Effect Snow

Caitlin Dempsey

Lake effect snow can occur when dry, cold air moves across a vast lake with warm waters, resulting in a snowfall event.

Shaded relief map over the Pacific Ocean showing changes to ocean temperature due to La Niña.

Triple Dip La Niña Event

Caitlin Dempsey

Current predictions have given La Niña a strong probability of persisting into 2023, making it a triple dip event.

A rainbow cloud with blue sky beneath and wispy clouds above.

Circumhorizontal Arc: Rainbow in the Clouds

Caitlin Dempsey

When conditions are just right, clouds can act like prisms, turning the rays of the sun into a brilliant color show.

Cloud streets over the Great Lakes, February 110, 2016. NASA image by Jeff Schmaltz, LANCE/EOSDIS Rapid Response.

Cloud Streets

Caitlin Dempsey

Cloud streets are cumulus clouds that form in long bands along cylinders of rotating air and are roughly parallel to the ground.

Satellite image of actinoform clouds off the western coast of Australia. Image: NASA, Aqua satellite, January 29, 2020.

What are Actinoform Clouds?

Elizabeth Borneman

Actinoform clouds are typically found along large Western landmasses over the ocean and were first seen on satellite imagery in the 1960s.

Image showing the change in the jet stream over the western U.S. during El Niño.

How El Niño and La Niña Affect Rain in the United States

Julian Marks

El Niño and La Niña are weather patterns that frequently have a considerable impact on the western and southwestern United States.

Hurricane Ida just before landfall on the Louisiana coast on Aug. 29, 2021. NOAA.

How Did Ida Turn Into Such a Strong Hurricane?

Geo Contributor

Oceanographer Nick Shay explains how eddies, part of what’s known as the Loop Current, help storms rapidly intensify into monster hurricanes.

Hurricane Ida just before landfall on the Louisiana coast on Aug. 29, 2021. NOAA.

4 Things to Learn About Hurricane Ida

Geo Contributor

These four resources explain why the New Orleans area is at high risk for severe hurricanes and what role climate change plays in these devastating storms.

For a few weeks during the spring months in the Gulf of Carpentaria in Australia, Morning Glory cloud formations can be seen. Map showing the location of the Gulf of Carpentaria in Australia. Map: Equal Earth Physical Map, public domain.

These Clouds Only Predictably Form in Australia

Caitlin Dempsey

Morning Glory clouds are a unique and rare cloud formation only predictably seen in the Gulf of Carpentaria in Australia during spring.

Cover of the book, "Drought, Flood, Fire: How Climate Change Contributes to Catastrophes."

Review | Drought, Flood, Fire: How Climate Change Contributes to Catastrophes

G.T. Dempsey

"Drought, Flood, Fire: How Climate Change Contributes to Catastrophes" is written by a scientist who understands how to meaningfully inform his non-scientist readers.  

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