Area Counties: Sac-Crawford-Carroll
1117 AM CST Tue Dec 21 2021

…Gusty Winds Expected This Afternoon Across the Region…

A strong cold front is moving across northern and central Iowa this afternoon. Winds just behind the boundary are increasing from the northwest with sustained winds of 25 to 35 mph and wind gusts to 50 mph. As the front sweeps southeast today, winds will increase across the area and continue through the mid to late afternoon hours.

If traveling through the region today, high profile vehicles may have difficulty at times. Loose objects will be blown around as well. The wind is expected to diminish after sunset.

Today: Partly cloudy. High 39, SW-W @ 10-20.

Tonight: Mostly clear. Low 13. Winds light & variable.

Tomorrow: Mostly sunny. High 42. S-NW @ 10-20.

Wednesday: P/Cldy. High 45.

Thursday: P/Cldy. High 52.

Sunday’s High in Atlantic was 35. The Low was 11. Last year on this date, the High in Atlantic was 42 and the Low was 33. The Record High was 61 in 1941, and the Record Low was -25 in 1901.

Today: Partly sunny, then gradually becoming sunny, with a high near 37. Wind chill values as low as 5. Breezy, with a south wind 5 to 10 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.

Tonight: Mostly clear, with a low around 23. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.

Monday: Sunny, with a high near 36. South southwest wind 6 to 14 mph becoming north in the afternoon. Winds could gust as high as 18 mph.

Tuesday: Sunny, with a high near 41. Breezy, with a south southeast wind 5 to 10 mph becoming southwest 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.

Wednesday: Sunny, with a high near 39.

Saturday’s High in Atlantic was 27. Our Low this morning, was 10. Last year on this date the High in Atlantic was 30 and the Low was 22. The Record High on this date was 58 in 1966. The Record Low was -33 in 1983.

Today: Cloudy to Partly cloudy. High near 30. NW @ 10-20 mph.

Tonight: P/Cldy. Low 10. Winds light & variable.

Tomorrow: Mostly sunny. High around 40. S @ 10-15.

Monday: P/Cldy. High 38.

Tuesday: P/Cldy. High 42.

Friday’s High in Atlantic was 41. Our Low was 25. Last year on this date the High in Atlantic was 44 and the Low was 27. The Record High on this date was 66 in 1976. The Record Low was -28 in 1983.

(Radio Iowa) – The storm that roared across Iowa Wednesday has been categorized as a derecho. National Weather Service Meteorologist, Brook Hagenhoff, says it’s not exactly the same as the 2020 version. “Technically it would be a serial derecho — which is different than what we saw last year with the August 10th derecho — which is more of what we would call a progressive derecho,” she says. “Kind of the main difference is kind of how it formed.” She says the derecho this week had winds in the upper 80s — but was more spread out across the state. “The derecho that we had last summer in August really had kind of that narrow area that had that very strong 100, 100 plus, 120s even as you got out toward Cedar Rapids. So, that’s kind of the main difference between the two — is that really narrow and very intense band last year — compared to this one which was widespread high-end winds,” according to Hagenhoff.

There were several tornadoes with Wednesday’s storm — and Hagenhoff says the 2020 version also had them. “The one that occurred last August actually did have tornadoes towards the end of the duration of it in the Illinois area. So most of the tornados did not occur in the state of Iowa — they were later on in its lifetime. But, that is something we tend to see in derechos,” she says. Hagenhoff says timing is what makes a storm a derecho when compared to the common thunderstorm. “There’s a requirement for a wind threshold and it has to go for a certain number of miles across the area. Whereas, with a typical thunderstorm that you might have, there’s no requirement for it to last a certain amount of time,” Hagenhoff says.

She says you usually don’t see something like this in December. “This is an extremely rare event — especially for Iowa to have an event of this scale in December,” Hagenhoff says. “We certainly set records as far as temperatures and those temperatures were certainly part of the fuel for the thunderstorms that we had through the evening hours. So, we’re in rare territory with a system like this for sure. The Storm Prediction Center before the event had issued a moderate risk for Iowa — which is a level four out of five. And that was the first time in their history that Iowa had been at a moderate risk.”

(Omaha/Valley, NE.) – Officials with the National Weather Service in Nebraska, late Thursday night, issued a report on their preliminary assessment of damage in Pottawattamie County from Wednesday’s tornado event.

A “narrow but strong tornado” that began at around 4:24-p.m. seven-miles southwest of Underwood, was rated an EF-2. It packed peak winds of 120 mph, was 50 yards wide, and traveled for 2.3 miles before ending five-miles southwest of Underwood.  The twister tracked along L-34 through Sherwood Country Estates before ending near Juniper Road. The maximum damage was sustained to a home in the Sherwood Estates, where a “Narrow tornado removed the majority of homes roof and damaged other nearby homes as well,” according to the Weather Service.

The second tornado was also an EF-2 that began two-miles east of Underwood and last for about five-minutes before ending two-miles north-northeast of Neola. It packed peak winds of 125 mph, was about 75-yards wide, and tracked for 6.7-miles.The narrow twister began producing damage near Mahogany Road and 290th Street at around 4:31-p.m., Wednesday, and tracked north-northeast into the southeast edge of Neola and caused intermittent damage near Railroad Highway, north of Neola.

The most significant damage was to a home along 290th Street, where the roof was removed and walls were blown out. A nearby garage was moved off its foundation, and approximately 10 mature trees and all uprooted behind the home, with substantial damage to hardwood trees in the front yard.

The narrow nature of the tornado, according to the NWS, was evident in the damage in the path, as nearby barns on the east of the track had low end damage, possibly owing to the significant forward speed of the twister. The tornado was seen briefly by the resident before they sought shelter. A business on the southeast side of Neola also had substantial damage to large metal buildings, at least two of which were destroyed.

(Des Moines, Iowa) – Officials with the National Weather Service Thursday evening issued a preliminary assessment of the damage caused by a tornado the struck near Atlantic Wednesday evening. The report says an EF-2 tornado (“Atlantic tornado”) traveled approximately 26.1 miles, beginning from southwest of Atlantic at around 4:50-p.m. and continuing to  Exira before dissipating near Hamlin 5:08-p.m.

Atlantic Tornado data

The twister, which was captured on at least three video recordings, had estimated peak wind gusts of between 115-and 120 miles per hour. No injuries or deaths were attributed to the event. The Weather Service says also, they are investigating five tornadoes in Iowa: 4 were EF-2; 1 was an EF-unknown;2 twisters had paths 26-miles long. Additional tornadoes are likely to be confirmed as the data is analyzed.

The Montgomery County Emergency Management Agency (EMA) has posted photos of the damage from Wednesday’s storms. Director Brian Hamman said on social media, “Storm damage from last nights storm and wind event seems to be sporadic throughout the county this morning. While there is some considerable tree and out building damage around, widespread damage is limited compared to some of our neighboring counties and communities. If you have damage and would like to post pictures, please do.

“A December severe weather event,” Hamman said, and ” is extremely rare and unprecedented in our area and I applaud all of our communities, business partners, local media and first responders for stepping up throughout the day to get the word out and to be prepared for what could have and eventually did happened. Please continue to use caution if you’re out and driving as there is still downed trees and power lines throughout the county. Public works and utility companies are out and doing their best to restore power and cleanup debris.”