Tue 24 October 2017
It looks like growing season will end before Halloween in the Red River Valley as we get an early frost/freeze this year. This may happen on the morning of October 28th, October 29th, or both. In fact, this will be close to record cold for the dates.
A pronounced north-south jet stream flow will push a significant batch of chilly Canadian air down the Plains and into Texoma during the day Friday; temperatures will reach freezing, or close to it, in much of Texoma both Saturday and Sunday morning.
Several factors will play into the weekend minimum temperatures such as cloud cover and how fast the winds drop off, but a range of upper 20s to mid-30s seems reasonable; this means many spots would get a light freeze over the weekend.
A killing frost is also expected over the majority of Texoma Sunday morning, which would end the growing season. Average first freeze dates range from the first few days of November in Ada to mid-November in Paris, so areas that get a weekend freeze will be a week or two ahead of schedule.
Despite this early cold spell, the long-range forecast still suggests a warmer than average winter, as we are slipping into a weak La Nina which favors dry and mild conditions.
By the way, the current record lows for Sherman-Denison and Ardmore are:
October 28.....31 (1957)
October 29.....32 (1952)
October 28.....27 (1925)
October 29.....28 (1910)
News 12 / KXII-TV