Memorial Day (Monday): Sunny & breezy. High near 75. NW winds @ 15-20 this morning, gusting to near 30 this afternoon.
Tonight: Mostly clear, with a low around 50. NW winds @ 10-25 mph.
Tomorrow: Sunny, with a high near 74.W-NW @ 10-25 mph.
Wednesday: Sunny, with a high near 73.
Thursday: Partly sunny & breezy w/a slight chance of afternoon showers & thunderstorms. High near 75.
Friday: A 50% chance of showers and thunderstorms. High near 72.
Sunday’s High in Atlantic was 81. The Low was 54. Last year on this date, the High in Atlantic was 80 and the Low was 44. The record High for May 27th was 100 in 2018. The record Low was 31 in 1907. Sunrise: 5:51. Sunset: 8:43.
(Omaha/Valley, NE) – Officials with the National Weather Service in Omaha, Sunday, said they had confirmed 12 EF-0 spin-up tornadoes associated with the derecho that moved through the region on Friday, May 24th. The Weather Service says “Quasi-Linear Convective System (QLCS) moved acrossthe area during the late night hours where several scattered tornado spin-ups were reported. QLCS tornadoes tend to be weaker and shorter-lived on average than those associated with supercell thunderstorms.”
In southwest Iowa, tornadoes occurred Friday south of Treynor, 3-miles east of Henderson, and two-miles north of Westphalia. Details are posted below:
..South of Treynor Tornado…
Survey Summary:
This very brief spin up remained near Aspen Road and 300th street south of Treynor. Three grain bins were destroyed as well as numerous trees.
Rating: EF0
Estimated Peak Wind: 83 mph
Path Length /statute/: 0.25 miles
Path Width /maximum/: 60 yards
Fatalities: 0
Injuries: 0
Start Date: 05/24/2024
Start Time: 03:00 AM CDT
Start Location: 4 S Treynor / Pottawattamie County / IA
Start Lat/Lon: 41.175 / -95.6151
End Date: 05/26/2024
End Time: 03:01 AM CDT
End Location: 3 S Treynor / Pottawattamie County / IA
End Lat/Lon: 41.1782 / -95.613
..Henderson Tornado…
Survey Summary:
This brief spin up tornado damaged trees at a farmstead as well as outbuildings.
Rating: EF0
Estimated Peak Wind: 74 mph
Path Length /statute/: 2.09 miles
Path Width /maximum/: 60 yards
Fatalities: 0
Injuries: 0
Start Date: 05/24/2024
Start Time: 03:10 AM CDT
Start Location: 3 E Henderson / Montgomery County / IA
Start Lat/Lon: 41.1316 / -95.3649
End Date: 05/24/2024
End Time: 03:10 AM CDT
End Location: 4 ENE Henderson / Montgomery County / IA
End Lat/Lon: 41.1582 / -95.3457
..Westphalia/Earling Tornado…
Survey Summary:
This brief spin-up tornado damaged roofs off an outbuilding and downed several trees.
Rating: EF0
Estimated Peak Wind: 80 mph
Path Length /statute/: 0.09 miles
Path Width /maximum/: 40 yards
Fatalities: 0
Injuries: 0
Start Date: 05/24/2024
Start Time: 03:13 AM CDT
Start Location: 2 N Westphalia / Shelby County / IA
Start Lat/Lon: 41.7524 / -95.3859
End Date: 05/24/2024
End Time: 03:13 AM CDT
End Location: 2 N Westphalia / Shelby County / IA
End Lat/Lon: 41.7531 / -95.3844
*********
EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories:
EF0…Weak……65 to 85 mph
EF1…Weak……86 to 110 mph
EF2…Strong….111 to 135 mph
EF3…Strong….136 to 165 mph
EF4…Violent…166 to 200 mph
EF5…Violent…>200 mph
NOTE:
The information in this statement is preliminary and subject to change pending final review of the events and publication in
NWS Storm Data.
These are 24-hour rainfall totals (7-a.m. Saturday, May 25th through 7-a.m. Sunday, May 26th), from around the listening area:
KJAN, .4″
Anita, .20″
Audubon, .52″*
Carroll, .01″
Clarinda Airport, .43″*
Corning, .34″
Creston Municipal Airort, .32″*
Denison, .56″
Elk Horn, .25″
Harlan, .15″
Massena, .35″
Red Oak, .23″
Shenandoah Municipal Airport, .08″
Stanton, .12″
Wiota, .21″
Greenfield, 3.00″
DES MOINES, Iowa [KCCI] — The line of severe storms that swept across Iowa Friday morning was in fact a derecho (pronounced “duh-RAY-cho”). That confirmation came from the Storm Prediction Center, which determined the powerful system met its criteria after plowing through the Midwest from Nebraska all the way to Illinois.
In simple terms, a derecho is a complex of thunderstorms that produces straight-line wind damage over a very long path. That damage path has to exceed 400 miles in length and must be at least 60 miles wide. Wind gusts have to exceed 58 mph (severe thunderstorm criteria) over most of the path, with occasional gusts above 75 mph.
The derecho that walloped Iowa Friday morning checked all those boxes. Reports of 60-70 mph gusts first came out of southwest Nebraska Thursday night. By 3 a.m. Friday, severe winds had arrived in western Iowa and would persist all the way into Illinois.
In Iowa, gusts above the 58 mph threshold were reported as far north as Estherville, and as far south as Highway 92, making the damage swath well over 100 miles wide. Finally, the system produced multiple high-end wind gusts (75+ mph) along its path, including an 83 mph gust in Monona County, 75 mph winds in Greenfield, and an 84 mph gust recorded near Newton.
Many Iowans hadn’t heard of derechos until a particularly powerful one struck Aug. 10, 2020.
Derechos actually happen with some regularity but are rarely as strong as the 2020 storm.
Historically, part of Iowa experiences a derecho every 1-2 years. Since 2010, a total of 14 derechos have hit somewhere in the state.
TODAY: Mostly cloudy with 30% chance of showers & thunderstorms, mainly this afternoon. High around 74. Winds East at 5-to 10-mph this morning, shifting to the North this afternoon.
TONIGHT: A slight chance of showers this evening. Gradually becoming mostly clear overnight. Low around 53.
TOMORROW [MEMORIAL DAY]: Sunny & windy, with a high near 75. W/NW winds @ 10-20 w/afternoon gusts to near 30 mph.
TOM. NIGHT: Clear, with a low around 49.
TUESDAY: Sunny, with a high near 75.
WEDNESDAY: Sunny, with a high near74.
THURSDAY: Partly sunny w/a 40% chance of showers and thunderstorms during the afternoon. High near 78.
Saturday’s High in Atlantic was 77. The Low was 51. We received .4 (four-tenths) of an inch of rain early this morning at KJAN. Last year on this date, the High in Atlantic was 79 and the Low was 41. The record High for May 26th was 100 in 2018. The record Low was 30 in 1901. Sunrise: 5:52. Sunset: 8:42.
Today: Partly cloudy to cloudy. High near 75. S/SW winds 10-25 mph.
Tonight: Showers & thunderstorms developing. Low around 56.
Sunday: Mostly cloudy w/a60% chance of showers & thunderstorms. High 73. SE winds becoming N/NW @ 10-20 mph.
Sunday Night: Cloudy to partly cloudy w/a30% chance of showers & thunderstorms. Low 50.
Memorial Day: Sunny to Partly sunny, w/ slight chance of afternoon showers & thunderstorms. High 75.
Tuesday: Sunny, with a high near 74.
Wednesday: Sunny, with a high near 76.
Friday’s High in Atlantic was 71. The Low was 44. Last year on this date, the High in Atlantic was 82 and the Low was 58. The record High for May 25th was 98 in 1967. The record Low was 30 in 1925. Sunrise: 5:53. Sunset: 8:40.
*Note, this is from the parent storm of the Greenfield tornado, as the storm cycled in northeast Adair County.
3) Martensdale Tornado – EF-0 – northwest Warren County
As post-event analysis continues, results above remain preliminary and are subject to change and refinement.(Area) – Severe storms that formed in Nebraska early this (Friday) morning raced into western Iowa, causing the National Weather Service to issue Tornado Warnings for some areas (including in Cass County), where radar detected rotation in the atmosphere. The storms reached Atlantic at around 3:30-a.m., bringing heavy rain and damaging winds that caused some large tree limbs to fall and block the road, at 7th and Linn, and other locations. Downed tree limbs were also reported to have blocked some roads in Red Oak.
A complete list of storm events/timing/damage (if any), can be found under the Storm Reports story on the Weather page at KJAN.com. Winds were the primary factor in the damage that occurred, with sustained gusts estimated at anywhere from 60-miles per hour in Glenwood, to 75-miles per hour in Greenfield, where they are trying to recover from Tuesday’s deadly EF-4 tornado.
North of Glenwood. Photo courtesy Shannon Kennedy Barton.
The Weather service reports:
There were no immediate reports of injuries associated with this latest round of severe weather.
(Radio Iowa) – Continued rains across the state brought more improvement in the latest U-S Drought Monitor for Iowa. D-N-R Hydrologist Tim Hall says the two most severe categories of drought are no longer found on the map. “So we’re just down to just over 20 percent of the state is rated in the D-1 moderate drought, so we don’t have any severe drought, no extreme drought in the state anymore,” Hall says. Nearly 67 percent of the state now has no form of drought, which compares to only three percent with no drought in January. Hall says the northeast part of the state is still the driest area, but it’s a lot better now.
“Tama and Benton counties, the last three years, it’s been the driest three years on record for those particular counties in the state,” Hall says. ” And that’s even drier than the dustbowl years of the 30s or the drought of the 1950s. So they were very much in a whole drought wise, and it’s just going to take those parts of the state longer to recover.” Hall says his discussion with the state climatologist indicates we could see spring flip from record dry to record wet conditions this year. “We could very well see a top ten wettest spring season on record by the time all is said and done with here,” he says. The plentiful rain has had some farmers worried about finishing planting, and at times it leaves ponds of water in fields.
Hall says he’s not worried about that at this point. “The fields in the areas that routinely run into inundation problems are seeing that right now with the rain we’ve had, but I don’t think it’s a widespread or catastrophic problem around the state,” Hall says. “I think we’d become used to the dry conditions over the last four years, and we just have gotten out of the habit of seeing saturated fields and standing water.”
Hall says it’s good to see the groundwater and stream flows come back to normal for the first time in a long time. And he says June is normally the wettest month of the year, so the pattern is likely to continue.
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