This week will be one of contrasts across the country. Nowhere will that contrast be more evident than up and down the Plains, where blistering heat will bake the southern Plains, while an early fall preview is on display in the Dakotas, as well as neighboring areas of the Midwest. Look at the projected 500 mb setup for tomorrow evening:
Now look at the latest projected 850 mb temperatures up and down the Plains:
Again, this is just tomorrow evening, when the really cool air is just starting to enter the playing field of the northern Plains and Upper Midwest. Basically, +30 degrees C at 850 mb from the Texas panhandle up to eastern Colorado and western Kansas, while in contrast, less than 10 degrees C in North Dakota. That's nearly a 25 degrees C difference aloft, or roughly a 45 degrees Fahrenheit temperature difference. And as you might expect, look at the projected early afternoon surface temperatures on the NAM model tomorrow afternoon:
The areas shaded in darker grey are projected to be over 110 tomorrow afternoon, with those shaded in the brown over 115. While those types of readings are not likely to be reached, I do believe much of Texas and into parts of Oklahoma will be over 100 tomorrow.
Meanwhile, with the next front slipping into the northern Plains, there very well could be some places that stay in the 60s, especially with clouds and any showers rolling through. Temperatures tomorrow night could easily drop into the 40s across parts of North Dakota and northern Minnesota any place where the sky is clear. And this only with the first little push of cool air coming into the region. It's conceivable there could be a chillier night in the wings later in the week.
Warmth will expand from the Gulf Coast into the Ohio Valley and mid-Atlantic states by Memorial Day, but the wet and stormy weather will persist in the Plains, and expand across the Mississippi Valley.
Chilly, wet weather will morph into a warm, humid pattern later this weekend into next week, one that will remain unsettled, especially in the Plains and Mississippi Valley.
Severe thunderstorms will erupt over West Texas late tonight and tonight, but they'll become more widespread over a larger percentage of the Plains states later tomorrow and Saturday.
After a brief cool spell, much of the country from the Plains on east will turn warmer Friday through Sunday, but there will also be more clouds, showers and thunderstorms around as well.