Quantcast

50 Cities With Biggest Increases in Heavy Downpours

Climate

The unprecedented rains and the resulting flooding in Texas and Oklahoma have captured headlines in recent days. Seven locations in those states had the most rain ever reported—including Oklahoma City which had its wettest month ever with almost five times the amount of rain it normally sees in May. And both states logged the wettest month on record.

Scientists think heavy downpours across the U.S. could be linked to climate change.
Photo credit: Shutterstock

It might be easy to pass these downpours off as rare and exceptional events that get coverage because they make great TV. But the number of such heavy deluges has increased across the country, resulting in heavy damage to infrastructure, business and school closures, property loss and even fatalities, such as the more than two dozen deaths reported so far in Texas. And scientists are seeing a link to climate change.

"While rainfall in the region is consistent with the emerging El Niño, the unprecedented amounts suggest a possible climate change signal, where a warming atmosphere becomes more saturated with water vapor and capable of previously unimagined downpours," said Climate Central, an organization of scientists and journalists which studies and provides information on climate change.

Looking at 65 years of rainfall data, Climate Central found that 40 of the 48 mainland states had an increase in the number of heavy downpours since 1950. The biggest increases were in the northeast with a 31 percent increase and the midwest with a 16 percent increase. Rhode Island had a 104 percent increase in heavy rainfall, followed by Maine with 61 percent, Wyoming with 58 percent, New Hampshire with 56 percent and Connecticut with 43 percent. Missouri, Vermont, Alabama, New York and Iowa all had increases in excess of 25 percent.

Check out this interactive map that shows the downpour trend in the U.S.:

Sixteen cities have seen rainfall increases of more than 100 percent, with McAllen, Texas far in the lead at 700 percent. Portland, Maine had a 400 percent increase, with Philadelphia, New York and Louisville all having increases of more than 300 percent.

Read page 1

Climate Central cited heavy rainfalls in Nashville and Detroit as examples of the impact of such rains. In Nashville in 2010, 13.6 inches of rain in a mere two days killed 11 people and caused $2 billion in damages. An August 2014 downpour in Detroit killed two and caused $1.1 billion in damages. The group also pointed to the potential health risks of such rainfall. It found that approximately half of the waterborne disease outbreaks in the U.S. from 1948 through 1994 were linked to periods of heavy rain.

 

The Texas rainfall has alleviated the drought the state suffered from last year, when half of it was under severe, extreme or exceptional drought. Now none is, and only a small fraction of the state is reporting even moderate drought. But that's probably little consolation to the residents of the 37 Texas counties in which Gov. Greg Abbott has declared disaster areas, saying "You cannot candy coat it. It’s absolutely massive."

Both Texas Senators, John Cornyn and Ted Cruz, are climate deniers who would vigorously dispute what Climate Central has to say, despite the fact that Texas suffers from a greater number of costly weather-related disasters than any state, including drought, heat and wildfires.

"Extreme heavy downpours are consistent with what climate scientists expect in a warming world," Climate Central explained. "With hotter temperatures, more water evaporates off the oceans, and the atmosphere can hold more moisture. Research shows that the amount of water vapor in the atmosphere has already increased. That means that  there is often a lot more water available to come down as rain. Climate scientists have already shown that increasing greenhouse gas concentrations as a consequence of human activity are partially responsible for the average global increase in heavy precipitation."

Measuring and dealing with such downpours is made difficult by the fact that, compared to extreme temperatures, they tend to be localized rather than regional events and random in nature, making it hard to tell where they will occur. But according to Climate Central, scientists think the increase in heavy downpours will continue throughout the 21st century.

"Climate models predict that if carbon emissions continue to increase as they have in recent decades, the types of downpours that used to happen once every 20 years could occur every 4 to 15 years by 2100," said Climate Central. "As the number of days with extreme precipitation increases, the risk for intense and damaging floods is also expected to increase throughout much of the country."

YOU MIGHT ALSO LIKE

Deadly Flooding in Texas Latest Example of Extreme Weather

Ted Cruz Continues to 'Coddle' His Fossil Fuel Funders in Wake of Deadly Texas Floods

3 Connections Between Climate Change and Extreme Weather

EcoWatch Daily Newsletter

The U.S. Centers for Disease Control and Prevention recommends getting regular cholesterol tests shortly after you turn 20. Ca-ssis / iStock / Getty Images Plus

Many people don't begin worrying about their cholesterol levels until later in life, but that may be increasing their odds of heart problems in the long term.

Read More Show Less
A child receives a measles vaccine. DFID - UK Department for International Development / CC BY 2.0

Measles infected nearly 10 million people in 2018 and killed more than 140,000, according to new estimates from the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC). Most of the people who died were children under five years old.

Read More Show Less
Sponsored
Ocean pollution concept with plastic and garbage pictured in Sri Lanka. Nestle is among the top corporate plastic polluters, according to a report called BRANDED Volume II: Identifying the World's Top Corporate Plastic Polluters. Anton Petrus / Moment / Getty Images

Nestlé cannot claim that its Ice Mountain bottled water brand is an essential public service, according to Michigan's second highest court, which delivered a legal blow to the food and beverage giant in a unanimous decision.

Read More Show Less

A number of supermarkets across the country have voluntarily issued a recall on sushi, salads and spring rolls distributed by Fuji Food Products due to a possible listeria contamination, as CBS News reported.

Read More Show Less
Birds eye view of beach in Green Bowl Beach, Indonesia pictured above, a country who's capital city is faced with the daunting task of moving its capital city of Jakarta because of sea level rise. Tadyanehondo / Unsplash

If you read a lot of news about the climate crisis, you probably have encountered lots of numbers: We can save hundreds of millions of people from poverty by 2050 by limiting global warming to 1.5 degrees Celsius above pre-industrial levels, but policies currently in place put us on track for a more than three degree increase; sea levels could rise three feet by 2100 if emissions aren't reduced.

Read More Show Less