The El Niño Effect: Is El Niño to Blame for the Historic Heat and Drought that Gripped the U.S. in 2023?

2023 was a year full of weather impacts on crops and livestock. From the intense heat in the South to the drought that parked itself across the South and Midwest, USDA meteorologist Brad Rippey says those are the two weather events that stole headlines this past year.

“When we look back at 2023, I’m actually going to break heat and drought into two separate categories,” says Rippey. “Really, when you look at the extreme heat this past year, it was focused across the deep South from Arizona to Florida, and pretty much everywhere in between. And that was certainly a huge weather story that affected parts of the cotton belt."

From wiping out a large part of the cotton crop in west Texas to hitting sugar cane production in Louisiana, Rippey says nearly the entire deep South saw impacts of the year’s extreme heat. 

“Of course, that came with drought in many cases. But when you look at these overall temperatures, the hottest summer on record and a lot of hottest months on record, that was a big story in the deep South,” says Rippey.  

While other parts of the U.S. still had drought, in some areas it didn't pack as big of a punch because it came without the heat. That was the case in much of the Corn Belt. The drought hit last year without the extended intense heat, which had a big impact on crops.

“We were very fortunate, especially in the Corn Belt, that we did not see the combination of extreme heat and drought at the same time. And that actually led to some of those better outcomes than expected for U.S. corn,” explains Rippey.

With USDA currently projecting the 2023 U.S. corn crop to be the largest on record, Rippey says the mild temperatures are what helped save the crops.

“You do see that things actually turned out better in states like Iowa. When you look at the rainfall numbers, they were abysmal, almost as dry as 2012. But then the heat just wasn't there. And today's varieties are little bit more tolerant of drought and heat. And the outcome was a little better than we expected,” says Rippey.

It wasn't all good news. While crop yields turned out better than expected for some farmers, the lack of moisture continued to dwindle grazing conditions and hay stocks in 2023. Those created additional hurdles in rebuilding the shrinking U.S. cattle herd. 

So, what was the culprit that caused the intense heat that suffocated the South during the summer months? Rippey says while it’s still being studied, he thinks it’s tied to one major weather event in 2023, in particular.

“I will go out on a limb and say that that may have been an early sneak attack from El Niño,” says Rippey. “The reason I say that is that because we did have an early onset El Niño. It was pretty much in place by late spring, early summer. It's pretty consistent with  El Niño to have a big ridge of high pressure that comes out of Central America. And at times, we've seen it before, that does sometimes extend all the way into the southern tier of the United States."

He says El Niño  can also be tied to the shipping crisis that wreaked havoc on exports in 2023, causing massive shipping delays, as well as forcing shippers to carry lighter loads.

“And certainly what happened in Mexico and parts of Central America, think about the Central American drought that's causing shipping problems in the Panama Canal. A lot of that, I think, could be tied to the heat in the atmosphere related to the early onset El Niño,” says Rippey.

According to Rippey, the drought in the Midwest can be attributed to the blocking high pressure that wouldn’t budge across Canada this past spring, summer or fall.

“The U.S. Midwest happened to be on the southern end of a lot of that high pressure over Canada. So when we think about that, think about the Canadian wildfires, all the smoke coming down. And we were just on the southern edge of that in the Midwest,” Rippey explains.

He says that, along with Northeasterly winds blocking moisture from the Gulf, is what caused the drought in the Midwest.

“At the same time, high pressure was far enough north that the heat and unusual warmth were actually focused across Canada. So, it wasn't all that hot on the southern end of the high, but it was dry. And that led to that cool drought in the western Corn Belt,” he adds.

 El Niño is still in play, as Rippey says El Niño made a splash once again to close out 2023.  

“Now that El Niño has kicked in, it's a strong event, it could be one of the strongest on record,” says Rippey. “We're seeing that influence of  El Niño starting to grab a hold of the reins of U.S. weather patterns. And that's pretty normal and certainly should continue into early 2024.”

What’s on tap for 2024? Rippey forecasts the intense El Niño will lead to what he calls “pretty profound” impacts for the rest of the winter, and even into spring.