More Warm Fall Days Across the U.S.

As the calendar turns to October, many people are excited to bring out their cool weather clothes. While parts of the western U.S. have already cooled enough to see snow, much of the U.S. will continue to be warmer than normal leading into this weekend. Here, we look at how the fall warming trend breaks down to individual warm fall days in cities a

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Summers Are Lengthening While Winters Shrink

While the West has been feeling the heat, fall-like temperatures dominated the eastern half of the country in August. But just as the calendar flips to astronomical fall, summer-like heat is making a return to many of those same places. So this week we examine the last annual occurrence of a hot, summer-like day in these U.S. cities.

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The First Frost is Coming Later

Coming off of a warm September, warmer falls are becoming a trend across the U.S., with the first freeze (temperature below 32°F) of the season arriving later than before. This trend is not limited to one area of the country. The first freeze is coming a full month (31 days) later in Boise, Idaho, 27 days later in Las Vegas, Nevada, and 24 days lat

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Climate Extremes Index

Harvey and Irma have brought devastating floods to Texas and Florida, while severe to exceptional drought has contributed to wildfires in Montana and the Pacific Northwest. These types of weather and climate extremes are trending upward, as indicated by the NCEI Climate Extremes Index. In addition to accounting for drought and hurricane winds, the

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longer growing season

More Frost-Free Days Means a Longer Growing Season

The growing season is now nearly two weeks longer on average across the U.S. compared to the beginning of the 20th century. While this may delight warm-weather lovers, warmer overnight temperatures can reduce productivity and quality of grains and fruits, which might increase their costs at the supermarket. Warmer average temperatures lead to an in

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first freeze

The First Frost is Coming Later

Coming off of a warm September, warmer falls are becoming a trend across the U.S., with the first freeze (temperature below 32°F) of the season arriving later than before. This trend is not limited to one area of the country. The first freeze is coming a full month (31 days) later in Boise, Idaho, 27 days later in Las Vegas, Nevada, and 24 days lat

more

More Warm Fall Days Across the U.S.

As the calendar turns to October, many people are excited to bring out their cool weather clothes. While parts of the western U.S. have already cooled enough to see snow, much of the U.S. will continue to be warmer than normal leading into this weekend. Here, we look at how the fall warming trend breaks down to individual warm fall days in cities a

more
summers lasting longer

Summer is Lasting Longer Across the U.S.

While there is a lot of variation from year-to-year, that last summer-like day is coming later in the year for many of our U.S. cities. This effectively lengthens summer at the expense of the other seasons. Though the calendar continues to turn the same as ever, fall is arriving later while spring is arriving earlier on average — and in many

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summer lasting longer

Summers Are Lengthening While Winters Shrink

While the West has been feeling the heat, fall-like temperatures dominated the eastern half of the country in August. But just as the calendar flips to astronomical fall, summer-like heat is making a return to many of those same places. So this week we examine the last annual occurrence of a hot, summer-like day in these U.S. cities.

more
climate extremes index

Climate Extremes Index

Harvey and Irma have brought devastating floods to Texas and Florida, while severe to exceptional drought has contributed to wildfires in Montana and the Pacific Northwest. These types of weather and climate extremes are trending upward, as indicated by the NCEI Climate Extremes Index. In addition to accounting for drought and hurricane winds, the

more
rain increasing in the U.S.

More Downpours in the U.S.

Harvey and Irma have brought devastating floods to Texas and Florida, while severe to exceptional drought has contributed to wildfires in Montana and the Pacific Northwest. These types of weather and climate extremes are trending upward, as indicated by the NCEI Climate Extremes Index. In addition to accounting for drought and hurricane winds, the

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flood map irma

Here’s How You Can Help Hurricane Researchers Map Irma’s Flooding

I co-founded the U-Flood project during Hurricane Harvey. It's a simple, but powerful project to generate crowdsourced flood maps in real time. We have launched U-Flood for nine cities that are impacted by Hurricane Irma. If you could please pass this along to your friends, we can generate useful maps that help emergency managers as well as the

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hurricane irma

I’m a Hurricane Researcher. I’ve Lived Through Tropical Storms. This Is Why Irma Worries Me

Hurricane Irma is barreling towards the Lower Florida Keys and southwest Florida as a large, powerful hurricane on the threshold of Category 4 or 5 intensity. Irma is forecast to remain at least a Category 4 hurricane through passage of the Lower and Middle Florida Keys and southwest Florida coast. Category 4 hurricanes are catastrophic. Here is a

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hurricane irma

Here’s What to Expect from Hurricane Irma’s Storm Surge

As Hurricane Irma tracks towards Florida, millions of people have been making decisions based on wind and storm surge forecasts. This blog post discusses Irma's storm surge potential and looks back at Hurricane Donna (1960), which may provide some valuable insights.

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great miami hurricane 1926

Hurricane Irma Is Aiming At Miami. Here’s What You Should Know About Storm Surge

As Hurricane Irma approaches South Florida, the U-Surge Project has launched a storm surge webpage for Miami. This page is open to the public and provides insights on both local storm surge history and long-term coastal flood risk, pulling data from 27 hurricanes and tropical storms over the past 137 years. The website provides infographics,

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hurricanes and climate change

Hurricanes and Climate Change: What We Know

Climate change intersects with hurricanes by increasing storm rainfall, intensity, and surge. A warming atmosphere causes more evaporation, meaning more water is available for precipitation. For every 1°F increase in temperature, the atmosphere can hold around 4 percent more water vapor, which leads to heavier rain and increases the risk of

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