Temperatures could drop 20 to 25 degrees across the Heartland this weekend, ending the unusually warm stretch

Forecasters at the National Weather Service’s Weather Prediction Center in College Park, Maryland, wrote on Oct. 22 that temperatures across the Heartland could cool by 20 to 25 degrees as a deepening low and cold front cross the region over the weekend of Oct. 24 and 25. The drop would end a stretch of unusually warm weather. Local National Weather Service offices have since pushed the timing of the cold air later in some places, and the size of the drop depends on where in the Heartland a thermometer sits.

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The wording sets the scale. The forecast does not name states or cities, and it gives neither a starting temperature nor a day. It describes a pattern in which a developing lee-side low over the Northern High Plains and a strong cold front pushing down the terrain into the Northern Rockies set up a push of colder air toward the center of the country.

The Weather Prediction Center’s Oct. 22 wording

The text comes from the short-range forecast discussion issued at 4:08 p.m. EDT on Oct. 22, signed by forecasters Asherman and Kebede and valid from 00Z on Oct. 23 to 00Z on Oct. 25. In its summary of the weekend, the discussion said that as the low deepens and the front crosses the Heartland, “temperatures could cool by 20-25 degrees, putting an end to the unusually warm weather.” The same discussion put showers and thunderstorms ahead of an upper low over California and flash flooding across the Four Corners through Friday morning, which shows how much of the country the system covers.

The discussion is a national summary and not a local forecast. It leaves the exact swing to the local offices that issue point forecasts, and it uses “could” for the 20-to-25-degree figure rather than stating a certainty.

How local offices timed the front

The later local forecasts show the timing sliding. The National Weather Service office in Topeka, Kansas, in its discussion issued at 5:34 p.m. CDT on Oct. 23, expected the front to stall near or just northwest of its area through much of Sunday and move southeast Sunday night into Monday. Highs on both Saturday and Sunday were forecast near 80 degrees across much of the area, with temperatures falling into the 60s behind the front. Rain chances begin Sunday evening in north-central Kansas, shift into east-central and northeast Kansas on Monday, and taper from northwest to southeast. Monday’s daytime highs ahead of the front were forecast in the low 70s, with clouds and lingering showers limiting the warming, and a persistent southerly breeze was expected through the weekend. The office called the timing uncertain, so the first cool afternoon in eastern Kansas could land on Monday rather than Sunday.

An earlier forecast further north had a faster front. The Omaha-area discussion issued at 5:58 p.m. CDT on Oct. 20 had a strong trough pushing through on Friday and a cold front arriving around Saturday morning, with showers and a wind shift to the northwest. It had highs ranging from the mid 60s in northeast Nebraska to the mid 70s in far southeast Nebraska and southwest Iowa on Saturday, then mid 50s to low 60s from Sunday through Tuesday, closer to normal after highs of mid to upper 70s, about 10 degrees above normal, from Wednesday through Friday. That forecast is three days older than the Topeka one, so the Topeka timing is the better guide for eastern Kansas.

The cold air source in Montana

The air behind the front starts in Canada. The National Weather Service office in Great Falls, Montana, issued a discussion at 6:50 p.m. MDT on Oct. 23 describing an upper-level disturbance and its cold front moving east, with a surge of colder air from Canada spreading across north-central and southwest Montana. It expected conditions cooler than average and drier from the weekend into early next week, with surface high pressure over the Canadian Prairies.

The Heartland drop will bring the first real cold of the fall to many places. The National Weather Service’s cold-weather safety page notes that cold air in early fall can damage or kill crops and home plants and flowers, that frost can form on clear, calm nights when air temperatures are in the mid-30s, and that a freeze occurs below 32 degrees Fahrenheit. None of the discussions read for this article forecast a freeze for the Heartland, but a 20-to-25-degree swing from highs near 80 would move some places toward those thresholds.

The practical reading for the weekend is that the 20-to-25-degree figure is a regional forecast with an uncertain edge. The southern Heartland, including Kansas, may see mild air through Sunday, while parts of Nebraska and Iowa were expected to cool earlier in the Oct. 20 forecast. The Topeka forecast itself shows the split, with highs near 80 degrees on Sunday ahead of a front that had not yet arrived and the 60s only after it passed. Each local office’s latest forecast discussion, not the national summary, sets the day the change arrives.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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