Another strong blast of cold air is plunging into the U.S. Sunday.
This will affect the Plains, Midwest and Southeast.
Some areas will see frost or freeze conditions.
A much colder fall reality check has arrived in the East, Midwest and South, featuring a second plunge of cold air.
A nosedive of the jet stream is pushing east with an intrusive and even more expansive, blast of colder air into the Ohio Valley and South.
The cold air has spread into the Ohio Valley, eastern Great Lakes and Southeast this weekend.
Parts of the upper Mississippi Valley and northern Great Lakes may be stuck in the 30s or 40s into early next week.
The Ohio Valley will see highs generally in the 40s through Sunday. The Deep South will see highs in the 40s, 50s and 60s on Sunday. Cooler, drier air will push through Florida from north to south on Sunday.
The Great Lakes and Ohio Valley should see lows in the 20s and 30s through early next week.
Lows in the 30s will penetrate parts of the Deep South and Tennessee Valley through Monday morning. Lows in the 40s will reach the northern and western Gulf Coast, with 30s potentially reaching the northern Gulf Coast Monday morning.
In the Deep South, these low temperatures may be the coldest seen since mid-March.
Some areas may see their first killing frost or freeze of the season during this cold snap. Freeze and frost alerts have been issued for portions of the Mississippi Valley and South into Monday morning.
A few record low temperatures are also possible and a few were set on Saturday morning. This includes Garden City, Kansas which dropped to 16 degrees and Waco, Texas which tied the record low of 30 degrees. Huntsville, Alabama also set a record cold high temperature Saturday with a high of only 50 degrees.
Additional record low temperatures have been set on Sunday morning, including Del Rio, Texas (35 degrees) and Austin, Texas (32 degrees).
Yet another reinforcing cold front will dive into the Plains and Midwest during the first half of Halloween week, but it may not be as potent farther south as this week's cold blasts.