Unusual Weather Patterns Across the US
In March, the United States is witnessing a remarkable combination of weather extremes, including flooding rains in Hawaii, rare snowfall in Alabama, fluctuating temperatures in the northeast, and a severe heatwave on the west coast. These unusual patterns have prompted experts to examine their connection to the ongoing climate crisis.
Authorities and scientists emphasize the need for increased public awareness regarding climate change and encourage proactive measures to mitigate its effects.
Seasonal Variability and Jet Stream Influence
While March has historically been known for unpredictable weather, especially in the northeast, the current conditions exhibit familiar seasonal transitions. Jon Nese, associate head of the Department of Meteorology and Atmospheric Science at Penn State, stated:
“The weather has behaved a lot like I expect it to. In March, we have some warm days, and then it turns sharply colder and snows. It’s the kind of rollercoaster that we’re used to.”
In New York, Daniel Bader, program manager at the Consortium for Climate Risk in the Urban Northeast at Columbia’s climate school, described a notable temperature swing:
“Temperatures at Central Park hit 80 degrees, and then two days later, there were snowflakes in the air.”
“March is kind of an active weather month. This kind, where one day it’s very warm, and the next day it cools off quite a bit, is not out of the ordinary.”
The jet stream, a fast-moving air current high in the atmosphere, plays a critical role in these extremes. Its waviness can cause simultaneous contrasting weather conditions across the country, such as warm ridges in one area and cold troughs in another. Nese explained:
“The heatwave in the west, happening at the same time as we turn sharply colder in the east, those two things are related.”
Bader added that seasonal temperature gradients influence the jet stream’s behavior, contributing to extreme events:
“There can be these ridges and troughs that develop and that can be contributing to some of these extreme events.”
Escalating Severity of Warm Extremes
Although March has always been associated with weather extremes, this year’s warm events are intensifying. The western US heatwave has repeatedly broken records in recent years, and the current episode is no exception. California, Nevada, and Arizona have been under heat warnings amid soaring temperatures.
The National Weather Service (NWS) reported that the Los Angeles area is experiencing “extremely rare heat for March,” cautioning residents about a high risk of heat-related illnesses. Palm Springs, located approximately 100 miles (160 km) east of Los Angeles, reached 107°F on Thursday. Heat alerts are expected to continue through Sunday.
A scientific team indicated that this heatwave would have been virtually impossible without the influence of the climate crisis. Global warming, primarily driven by fossil fuel combustion, has made such heatwaves four times more likely over the past decade, according to a report released on Friday.
Nese remarked on the unusual warmth:
“The warmth in the west right now is very unusual. There are going to be a ton of high temperature records set. Some of the temperatures may actually beat April records.”
Bader was even more explicit:
“This is really unprecedented conditions. We may break April records. The warmest temperature in March ever recorded in the United States might fall.”
Snowfall and Storms in Unexpected Regions
Even isolated anomalies such as snowfall in Alabama highlight the broader variability in weather patterns. Several northern states, including Wisconsin, Minnesota, and Michigan, have experienced snowfall totals reaching double digits.
On Tuesday, a powerful storm system caused outages affecting half a million US homes and businesses. The storm brought a combination of snow, strong winds, cold temperatures, and rainfall from the Midwest to the East Coast.
Nese commented on the rarity of snow in Alabama during March:
“Snow in Alabama in March is pretty unusual.”
The relationship between unusual snowfall and climate change remains complex and under investigation. However, there is greater consensus regarding the influence of climate change on heat events.
Climate Change’s Role in Heat and Precipitation Extremes
Nese noted the likely connection between the heatwave and climate change:
“It’s probably reasonable to say that this heatwave in the west in March will have a climate change fingerprint on it.”
Bader emphasized the difficulty in attributing individual events but highlighted clearer trends:
“The greatest connections we can draw are related to extreme heat events becoming more frequent and also more intense.”
He further explained that a warmer atmosphere can hold more moisture, potentially intensifying rainfall:
“A warmer atmosphere can hold more moisture that could potentially lead to more heavy precipitation.”
While climate change may influence some instances of unusually cold weather, the frequency of record-breaking heatwaves far exceeds that of cold events as global temperatures rise.
Looking Ahead: Summer Heat and Preparedness
This summer is anticipated to be among the hottest on record, continuing the pattern of record-breaking heat driven by the climate crisis and the emergence of a strong El Niño.
As weather extremes become increasingly unpredictable, experts stress the importance of preparedness. This comes amid reductions in funding for the Federal Emergency Management Agency (FEMA) under the Trump administration, which has impacted the US’s capacity to respond to natural disasters.
Bader concluded:
“These events are kind of constant reminders that we are very vulnerable to weather and climate extremes. If there are opportunities to minimize the impacts, then we should take advantage of those.”
