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Goodbye, La Niña? Eric Snodgrass Dissects What the Shift Means for Weather This Spring and Summer

Fri, 14 Mar 2025 21:12:49 GMT

La Niña is weakening, and the National Oceanic and Atmospheric Association (NOAA) expects neutral conditions to develop in the next month . But even with La Niña fading, meteorologists are still concerned about drought this spring and summer.

NOAA this week said forecasters expect ENSO-neutral conditions to develop in the next month and persist through the Northern Hemisphere’s summer. According to NOAA, La Niña’s signature is cooler-than-average surface water in the east-central tropical Pacific, stronger-than-average trade winds, and drier conditions over the central Pacific.

ENSO-neutral means conditions could be close to average, but Eric Snodgrass, Nutrien’s principal atmospheric scientist, says that doesn’t mean the weather will be normal this spring and summer.

“I do expect changes,” Snodgrass says. “Think about it like this: The previous winter was an El Niño winter, and it was very mild and very wet. So, we got into spring ’24 with tons of moisture. I mean, Iowa, Minnesota and South Dakota flooded out. Then we had this incredibly dry fall as the La Niña began, and it reached a peak twice. It actually hit a peak in December, and then a secondary peak about a month later at the end of January. It’s been fading ever since. The big question is, as we go into neutral conditions for this upcoming growing season, is it going to be one that paints a picture of precipitation extremes? Did it leave us with any sort of kind of problems from winter that are carrying over?”

Snodgrass says the severe weather outbreaks on Friday, that brought high winds, dust storms and wildfire warnings across the Plains, is a reminder how dry it is in the Southwest.

“We’ve got major pockets of the country that are still dealing with some pretty big drought conditions. It is fading, and that is a signal we have to pay attention to,” Snodgrass says.

USDA meteorologist Brad Rippey is also concerned about what impact the shifting pattern will have on farmers this spring. But it’s not just the dryness. It’s also the fact areas are getting inundated with rains that could pose problems.

“With this stormy weather pattern in place, that is going to create some difficulty for spring field work in some areas. It looks like the primary storm track may be through parts of the middle of the country extending into the lower Midwest and eventually the interior northeast. That is one area where we already have fairly wet conditions,” Rippey says.

How sea surface temperatures in the Niño-3.4 region of the tropical Pacific changed over the course of all La Niña events since 1950 (gray lines) and 2024-25 (black line). This shows the traditional calculation for Niño-3.4, the monthly temperature compared to the most recent 30-year average (1991–2020 for the 2024 line). By this measure, the La Niña threshold was crossed in December 2024, but La Niña remains weak.

(NOAA)

La Niñas and El Niños Are Strongest in the Winter
Snodgrass points out La Niñas and El Niños are always strongest in Northern Hemisphere’s winter, which means they fade in spring and summer.

While La Niña-like conditions were a trademark in late fall, we didn’t reach the official definition of La Niña until January.

“The atmosphere way back in November was already treating our winter timeframe like a La Niña,” Snodgrass says. So, we were getting the influences of it as it comes in and goes out. And now the question is, what’s it going to do?”

February 2025 sea surface temperature compared to the 1985-1993 average. The surface of the east-central tropical Pacific is slightly below average temperature, but much of the global ocean remains warmer than average.

(NOAA )

“This is a great map to look at,” Snodgrass says, referencing the map above. “If you focus right in the middle, you see the large area of the cooler colors. Our line is now shifting to the central and West Pacific and behind it over by South America. All of the warmer water is beginning to emerge. And that’s what’s killing it because there’s a trade wind across that area from the east to the west. We’re going to watch this fade carefully during the spring. But the question is: Do we get winter’s leftovers?”

What Fueled the Dryness This Winter?
During the winter, Snodgrass points out there was no subtropical jet. That’s what fueled drought in the Southwest and Northwest.

“I’m actually kind of worried about the beginning of April having another shot at cold air after what we’ve been experiencing in March, which has been so very, very mild. Then you say, well, we’ve had so much dry air in place. Are we still worried about more dry air coming back? To be honest, these big storm systems coming through the central U.S., if we could get four, maybe five more of those by early April, we’re going to hate it. It’s nasty weather. It’s not fun, and it’s dangerous, but it returns moisture. That could be part of the mix of things, including the fading of La Niña that could help bring us away from these major early season drought risk scenarios.”

55% of corn production, 46% of soybean production, 33% of the cotton growing area and 27% of the winter wheat production are currently experiencing drought.

(U.S. Drought Monitor )

Growing Drought Concerns
What if it doesn’t? What if we don’t see more of this severe weather hit the Southwest and Plains, and moisture remains absent as we get into the height of spring? Well, the area will enter into the height of the growing season dry and reduce their chances of seeing moisture this summer.

“That’s a box we check every spring,” Snodgrass says. “If the drought monitor saw a reduction in drought over winter, then that gives us a different look for spring. But what we see here is two-thirds of the country in some stage of drought, including the abnormally dry category. But it’s the epicenters of drought that are so concerning. Look at the Western Corn Belt. Look at the Southwest. We just wonder if that funnels into the Mississippi Valley as we go forward.”

At the same time some areas are seeing drought, Kentucky, southern Indiana, southern Illinois, Tennessee, Arkansas and the boot heel of Missouri are all experiencing heavy rains and flooding.

“By May 11, I want to know what the drought monitor map looks like. If it looks no different, then I’m going to be sounding alarms going into summer with concerns this will start to creep and move because as soon as we get into the summer weather, all we get is convective storms pop off. And what do they do? They just locally deliver rain - not big broad swaths of it,” Snodgrass says.

Tale of Two Weather Scenarios
He says the forecast leading up to May 11 is a tale of two weather patterns, with the Mississippi River being the dividing line for moisture.

“If you are along it and east of it, I think we’re going to have tight windows to plant. You could include a little bit more of Missouri, Iowa and Minnesota in that as well,” Snodgrass says. “I think we’re going to see repeated storm systems. The best moisture is east. It keeps avoiding that southern plains area.”

What to Watch: Where the Storm Chasers End Up
Snodgrass says if storm chasers are busying chasing severe weather across the Ohio Valley, the mid-south and the southeast, but not in Kansas and the Plains, that’s a key indicator there’s a problem with the moisture getting back into the plains.

“If it’s not there by the time we start June, it’s very difficult to rely on the atmosphere to return it once you get into the summer months if you live in the central plains, which is where they could build from,” he adds.

To watch the complete discussion with Snodgrass, visit Farm Journal TV and take advantage of the free trial.

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Hope For Drought-Stricken Land? Your Winter Weather Outlook

Mon, 28 Oct 2024 20:30:10 GMT

What is it you remember from last year’s winter? Maybe it was when the wind chill in Kansas City brought temperatures down to -30°F and Patrick Mahomes’ helmet shattered in the middle of a playoff game. A more accurate representation of the season, though, is probably Wisconsin’s snowmobile industry dubbing the season a “lost winter” from the lack of snowfall.

Regardless of how we remember it, last year’s winter was incredibly mild, with temperatures well above normal and snowfall almost nonexistent. But according to Eric Snodgrass, senior science fellow at Nutrien Ag Solutions, the consensus is that the months ahead are going to look a lot different.

“We didn’t really have a winter last year,” Snodgrass says. “This year, we have a better chance of a storm track coming through the “I” states and out through the Ohio Valley toward the northeast. So, the forecast is a little wetter there with periods of colder air. It doesn’t mean it will get cold, stay cold and not stop snowing, but it’s certainly going to be different than a year ago.”

That’s because this winter brings about a 75% chance for La Niña to develop, which is when the trade winds across the equatorial Pacific are strong. With La Niña in the forecast, the National Oceanic and Atmospheric Administration (NOAA) is predicting wet conditions in the north and dry, warm weather in the south.

The 2024-2025 U.S. Winter Outlook map for temperature shows the greatest chances for cooler-than-average conditions in the Pacific Northwest of the U.S.

(NOAA)

USDA meteorologist Brad Rippey says La Niña can also bring chances for extreme cold events.

“Not every La Niña is like this, but I will say two prime examples were in 1989 and 2021 — that latter outbreak was when Texas pretty much lost power,” Rippey says.

Drought Dangers
With dry conditions in the forecast, Snodgrass says the big story this winter will be whether or not there will be enough moisture to work against the drought that has been building.

“The best winters for agriculture are the ones we hate and remember as being terrible — we get good, hard freezes and plenty of moisture comes in,” Snodgrass says. “If we don’t see that, we get into a situation where we become very dependent on spring rains and may have a conversation about 2025 drought risk.”

The 2024-2025 U.S. Winter Outlook map for precipitation shows wetter-than-average conditions are most likely across the Great Lakes region of the U.S.. Drier-than-average conditions are forecast for parts of the U.S. Gulf Coast.

(NOAA)

Snodgrass explains drought is often a multiseason effect, and Rippey says this one has been building since June.

“There’s been a four-fold increase in drought to now affecting about 50% of the country,” Rippey says. “That was great for summer crops, dry down and harvesting, but now the problem is what will happen with winter wheat, cover crops, pastures and range land.”

While much of the north will have the opportunity for relief from this growing drought, that likely won’t be the case in the south.

“We are expecting a generally warmer- and drier-than-normal winter across the entire southern tier of the United States, reaching all the way from Southern California to the middle and southern Atlantic coast. That does include important winter wheat production areas into the Southern Great Plains,” Rippey says. “There’s not much reserve right now in terms of soil moisture, and this could amplify already existing dry conditions.”

That brings concern for river transportation as the bump in water levels that came from Hurricanes Milton and Helene has worked its way through the system now.

“Historically, those levels tend to bottom out around January at the latest,” Rippey says. “We’re probably talking about a few more months of low water issues, and then you start to turn a corner around February because plants don’t use as much water during the winter.”

Timing Will Be Everything
Because winter is technically the country’s dry season, it won’t be easy to break drought in the months ahead. For the wet forecast in the north to make a difference, Rippey says it will all come down to timing.

“It’s important to start getting moisture before it gets too cold,” Rippey explains. “When you go into a cool season like this with limited soil moisture, if the cold air comes in too quickly, you freeze the soils before you get moisture, which can limit the absorption of rain and snow into those soils.”

The timing of when La Niña really starts to take effect will be important as well.

“December is going to be the month where we test if this La Niña really has what it takes to give us the things we expect,” Snodgrass says. “Normally, La Niñas peak around Christmas, and then they start to fade. If we miss that opportunity, we will watch all of the sub-seasonal things and hope they can deliver good winter weather to knock out the risk of drought going into 2025.”

But even with a few “drought risk” boxes being checked, it’s still too soon to speculate or worry about what next year’s growing season will look like.

“2022 had major fall drought, and then what happened? It rained in July, didn’t get terribly hot, and we had a decent crop. Indiana had one of its best crops ever in 2023, even though it was so dry in spring,” Snodgrass says. “We have to remember that the crop has many ways by which to stay alive and do well, and we’ve engineered that seed to be better performing even when there is some stress. We can’t make big, broad assumptions that 2025 is going to be a year of substantial drought risk that destroys yield.”