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Records shattered as seasons play tug-of-war across the US

AccuWeather logo AccuWeather 4/6/2021 Maura Kelly

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A storm system over the central U.S. as captured by satellite on Tuesday, April 6, 2021, was responsible for drastic temperature contrasts across the country. (NOAA / GOES-EAST)

As the first full week of April began across the United States, the weather was marked by a battle between winter in the Northwest as frigid air swept in behind a storm, and summer across the Plains as temperatures soared to record-setting levels.

The dividing line between this tug-of-war match was drawn by a storm system that moved out across the central Plains Tuesday.

Ahead of the storm, temperatures across the center of the country surged Monday. Highs reached into the upper 70s F and 80s F from New Mexico, Texas and Louisiana to South Dakota, Minnesota and Wisconsin -- and a few locations even topped 90 F for the first time since last summer or autumn.

Sioux Falls, South Dakota, was one of the sites that reached 90 degrees Monday, setting a new record high temperature for the date. The previous daily record was 87 set back in 1991. It was also the earliest the city reached the 90-degree temperature benchmark in a calendar year, shattering the old record, which was set in 1954, by nine days.

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Sioux Falls hadn't experienced a temperature over 90 since late last summer when the high soared to 91 F on Sept. 6, 2020. And the summerlike day ended with a bang in Sioux Falls and surrounding areas. A severe storm pressed overhead of the Sioux Falls National Weather Service (NWS) office during the evening, spawning large hail.

Farther south, El Paso recorded one of the highest temperatures across the Plains Monday when the mercury skyrocketed to 92 degrees during the afternoon hours and set a new record high for the date. The old daily record high of 89 F was set in 1942 and tied in 2016. The last time El Paso reached the 90-degree mark was on Oct. 21, 2020.

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North Platte, Nebraska, and Burlington, Colorado, also hit 90 degrees Monday, each setting a new record high temperature for the day. The 90-degree reading in North Platte eclipsed the previous daily record high of 87 set in 1991. Meanwhile, Burlington surpassed the old daily record of 85 set way back in 1959.

The recorded temperatures easily overshot normal high temperatures for the Plains in the beginning of April, which range from the lower 50s in the Dakotas to the middle 70s in western Texas.

Even in the height of summer, the normal high temperatures in Sioux Falls only climbs to as high as 84 degrees. In contrast, normal high temperatures reach the lower 90s in El Paso by the middle of May.

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Dramatically plummeting temperatures in the wake of the storm will set the stage for accumulating snow in some areas of western Nebraska. A few locations that recorded temperatures in the 70s and 80s Monday could pick up between 1 and 4 inches of snow Tuesday night. Some locations where temperatures climbed into the upper 80s could see a mix of rain and snow Tuesday night, but rain is expected in North Platte, according to AccuWeather forecasters.

On the western side of the storm, temperature records were on the opposite end of the spectrum as a blast of Arctic air swept into the Northwest in the wake of the storm system.

The temperature at the NWS office in Seattle dropped to 33 F on Monday, breaking the old daily record low for this location of 34 F set in 1997.

Olympia, Washington, tied the daily record low of 26 degrees for the date, which was set in 1961.

The clash of warm and cold air across the U.S. is a common occurrence during the spring months. In addition to more daylight hours and an increasing sun angle, which allows temperatures to climb higher, the storm track across the country begins to shift north. This allows warmer air to reach places farther north across the nation.

At the same time, potent storms can still drag frigid air sitting over Canada deep into the U.S. in their wake.

That collision in opposing air masses is one of the main driving forces in the development of severe weather across the Plains and Southeast during March, April and May.

As the storm responsible for the dramatic contrast in temperatures strengthens over the Plains into the middle of the week, it will ignite rounds of severe thunderstorms from Kansas and Oklahoma to Missouri, Tennessee and Alabama.

Keep checking back on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier, Spectrum, FuboTV, Philo, and Verizon Fios.

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