An unseasonable warmup will continue to spread throughout most of the U.S. this week, with high temperatures from Texas to the Midwest feeling more like May than the end of meteorological winter.

Hundreds of temperature records – record highs and record-warm lows – are expected to fall through midweek, with Monday and Tuesday forecast to be the warmest days across the Plains and Midwest. On Monday, more than 250 million Americans will experience above-average temperatures. 

“This warmth is really beginning to build today across the middle tier of the country, and it continues to shift its way eastward by about Tuesday,” FOX Weather Meteorologist Jane Minar said. 

Temperatures more typical for the end of May are possible in cities such as Omaha, Nebraska, and Indianapolis, with highs in the 60s and 70s. On Tuesday, a high of 68 is forecast for Chicago. This warm air will help fuel a severe weather threat in the Midwest.

In the southern Plains, temperatures will skip spring and jump right into summerlike heat, with highs topping out in the 80s and 90s in Texas and Oklahoma.

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