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|[[Page County, Iowa|Page]], [[Taylor County, Iowa|Taylor]], [[Adams County, Iowa|Adams]], [[Adair County, Iowa|Adair]]
|[[Page County, Iowa|Page]], [[Taylor County, Iowa|Taylor]], [[Adams County, Iowa|Adams]], [[Adair County, Iowa|Adair]]
|[[Iowa|IA]]
|[[Iowa|IA]]
|{{Coord|40.8866 |-94.9571|name=Greenfield (May 21, EF3)}}
|{{Coord|40.8866 |-94.9571|name=Greenfield (May 21, EF4)}}
|19:57–20:43
|19:57–20:43
|{{convert|43.98|mi|km|abbr=on|sortable=on}}
|{{convert|43.98|mi|km|abbr=on|sortable=on}}
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|{{convert|1000|yd|m|abbr=on|sortable=on}}
|- class="expand-child"
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| colspan="8" style=" border-bottom: 1px solid black;" |5 deaths – Initial storm surveys have confirmed EF4 damage in Greenfield and in rural portions of southern Adair County. Preliminary information.<ref>{{cite report|author=National Weather Service in Des Moines, Iowa|title=NWS Damage Survey for 05/21/2024 Tornado Event Update #2 |url=https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=PNSDMX&e=202405232058 |publisher=Iowa Environmental Mesonet |date=May 23, 2024 |access-date=May 23, 2024}}</ref><ref>{{Cite news |last=Fingerhut |first=Hannah |last2=Beck |first2=Margery A. |date=May 22, 2024 |title=5 dead and at least 35 hurt as tornadoes ripped through Iowa, officials say |url=https://apnews.com/article/severe-weather-midwest-iowa-tornadoes-26c73e14ab481ef77a1b0606a2b10adc |url-status=live |access-date=May 23, 2024 |work=[[Associated Press]]}}</ref>
| colspan="8" style=" border-bottom: 1px solid black;" |5 deaths – ''[[#Corning–Greenfield, Iowa|See section on this tornado]] – ''Initial storm surveys have confirmed EF4 damage in Greenfield and in rural portions of southern Adair County. Preliminary information.<ref>{{cite report|author=National Weather Service in Des Moines, Iowa|title=NWS Damage Survey for 05/21/2024 Tornado Event Update #2 |url=https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=PNSDMX&e=202405232058 |publisher=Iowa Environmental Mesonet |date=May 23, 2024 |access-date=May 23, 2024}}</ref><ref>{{Cite news |last=Fingerhut |first=Hannah |last2=Beck |first2=Margery A. |date=May 22, 2024 |title=5 dead and at least 35 hurt as tornadoes ripped through Iowa, officials say |url=https://apnews.com/article/severe-weather-midwest-iowa-tornadoes-26c73e14ab481ef77a1b0606a2b10adc |url-status=live |access-date=May 23, 2024 |work=[[Associated Press]]}}</ref>
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! scope="row" rowspan="2" style="background-color:#{{#invoke:Storm categories|color|cat2}}; border-bottom: 1px solid black" | EF2
! scope="row" rowspan="2" style="background-color:#{{#invoke:Storm categories|color|cat2}}; border-bottom: 1px solid black" | EF2

Revision as of 00:21, 24 May 2024

Tornado outbreak sequence of May 19–27, 2024
Meteorological history
DurationMay 19–22, 2024
Tornado outbreak
Tornadoes34+
Maximum ratingEF4+ tornado
Highest windsTornadic – 175–185 mph (282–298 km/h) – Greenfield, Iowa EF4 on May 21
Overall effects
Fatalities4+[1][2]
Injuries35+[1][2]
Areas affectedMidwestern and Southern United States
Part of the Tornadoes of 2024

A significant tornado outbreak unfolded across the Midwestern United States from May 19–22, 2024. Multiple tornadoes have been reported across portions of Iowa, Minnesota, and Wisconsin. A Particularly Dangerous Situation (PDS) tornado watch was issued. Multiple fatalities have been reported with a tornado that went through Greenfield, Iowa.

Meteorological synopsis

The Storm Prediction Center's Day 1 convective outlook for May 21, 2024, issued at 1300Z, indicating a moderate risk for severe weather over much of Iowa and nearby parts of Wisconsin, Illinois, Missouri, and southeastern Minnesota.

May 19–20

May 21

On May 21, the Storm Prediction Center (SPC) issued a Moderate risk for severe weather in the states of Iowa, Missouri, Minnesota, Wisconsin, and Illinois, including a 15% risk for significant tornadoes.[3] Upper-air soundings observed steep lapse rates in the middle troposphere over parts of Kansas and Missouri on the morning of May 21. The SPC predicted that these conditions would spread into the primary severe weather risk area, overlapping with a moist airmass with dew points approaching 70 °F (21 °C) and leading to strong potential atmospheric instability.[4] That morning, an organized cluster of thunderstorms moved into Iowa after having produced severe wind gusts in central and eastern Nebraska. This line of storms continued across central and eastern Iowa just north of a warm front, presenting a continued threat for damaging wind gusts.[5] Additional storms began to develop along the border between Kansas and Nebraska ahead of an approaching trough. The SPC anticipated that the atmospheric environment over eastern Nebraska and western Iowa would become increasingly conducive for further organization of these storms into supercells.[6] A tornado watch was issued by the SPC for areas near and along the Nebraska–Iowa border region at 11:10 a.m. CDT in anticipation of these changes.[7] At 1:10 p.m. CDT, the SPC issued a tornado watch flagged as a particularly dangerous situation for much of Iowa and parts of surrounding states, including an 80% likelihood of a significant tornado occurring within the watch area.[8] Supercells were active over southwestern Iowa by the mid-afternoon, approaching an environment favorable for tornadogenesis leading into the Des Moines area.[9]

Multiple tornadoes were reported in Iowa, including a damaging tornado near Corning and in Greenfield, where multiple fatalities were reported.[10][2] Tornadoes were also reported in Minnesota and Wisconsin.[10]

Confirmed tornadoes

Confirmed tornadoes by Enhanced Fujita rating
EFU EF0 EF1 EF2 EF3 EF4 EF5 Total
3 14 18 3 1 1 0 40+


May 19 event

List of confirmed tornadoes – Sunday, May 19, 2024[a]
EF# Location County / Parish State Start Coord. Time (UTC) Path length Max width
EFU N of Ellinwood Barton KS 38°23′22″N 98°36′49″W / 38.3895°N 98.6137°W / 38.3895; -98.6137 (Ellinwood (May 19, EFU)) 18:47–18:49 1.20 mi (1.93 km) 40 yd (37 m)
A tornado was videoed. It did not cause damage.[11]
EF1 NW of Russell Russell KS 38°53′56″N 98°53′55″W / 38.899°N 98.8985°W / 38.899; -98.8985 (Russell (May 19, EF1)) 20:32–20:42 1.68 mi (2.70 km) [to be determined]
Numerous power poles were broken and leaning.[12]
EF1 ENE of Wilson Ellsworth KS 38°50′46″N 98°22′39″W / 38.8461°N 98.3774°W / 38.8461; -98.3774 (Wilson (May 19, EF1)) 21:20–21:25 0.37 mi (0.60 km) [to be determined]
A pivot system was flipped, and a Kansas Department of Transportation sign was twisted.[12]
EFU NE of Adair McDonough IL 40°26′10″N 90°28′40″W / 40.4362°N 90.4778°W / 40.4362; -90.4778 (McDonough (May 19, EFU)) 23:35–23:40 0.63 mi (1.01 km) [to be determined]
Brief landspout that caused no damage.[13]
EF2 NNE of Iliff Logan CO 40°50′N 103°01′W / 40.83°N 103.02°W / 40.83; -103.02 (Iliff (May 19, EF2)) 23:45–23:50 [to be determined] [to be determined]
An EF2 tornado was confirmed by NWS Boulder. Preliminary information.[14]
EFU NE of Iliff Logan CO 40°49′N 102°57′W / 40.82°N 102.95°W / 40.82; -102.95 (Iliff (May 19, EFU)) 23:56 [to be determined] [to be determined]
A storm spotter reported a brief tornado.[14]
EF2 E of Butler to N of Custer City Custer OK 35°38′N 99°07′W / 35.64°N 99.11°W / 35.64; -99.11 (Custer City (May 19, EF2)) 00:24–01:02 15 mi (24 km) 1,500 yd (1,400 m)
A very large, multi-vortex tornado damaged numerous trees, numerous farm buildings, and a few homes. The total width of the tornado and accompanying straight-line winds was nearly 3 mi (4.8 km).[15]
EF1 ESE of Custer City Custer OK 35°38′N 98°46′W / 35.63°N 98.77°W / 35.63; -98.77 (Custer City (May 19, EF1)) 01:05–01:14 5 mi (8.0 km) 400 yd (370 m)
Numerous trees and buildings, as well as a few homes, were damaged.[15]
EF1 NW of Burns Marion KS 38°05′56″N 96°55′17″W / 38.0989°N 96.9215°W / 38.0989; -96.9215 (Burns (May 19, EF1)) 01:16–01:18 0.99 mi (1.59 km) 40 yd (37 m)
Trees were damaged.[11]
EF0 S of Hydro Caddo OK 35°32′N 98°35′W / 35.54°N 98.58°W / 35.54; -98.58 (Hydro (May 19, EF0)) 01:24 0.8 mi (1.3 km) 40 yd (37 m)
Multiple people observed a tornado cross Interstate 40, where it overturned a semi-truck and damaged a Department of Transportation facility.[15]
EF2 SW of Yukon Canadian OK 35°26′N 97°55′W / 35.43°N 97.91°W / 35.43; -97.91 (Yukon (May 19, EF2)) 02:34–02:48 7 mi (11 km) 300 yd (270 m)
A strong tornado damaged homes, trees, and power poles.[15]
EF0 SE of El Reno Canadian OK 35°27′N 97°55′W / 35.45°N 97.92°W / 35.45; -97.92 (El Reno (May 19, EF0)) 02:43–02:53 3 mi (4.8 km) 30 yd (27 m)
Storm chasers observed a tornado that damaged one sign.[15]
EF0 SW of Auburn Osage KS 38°50′10″N 95°50′35″W / 38.8362°N 95.8431°W / 38.8362; -95.8431 (Osage (May 19, EF0)) 02:44–02:48 0.96 mi (1.54 km) 40 yd (37 m)
A NWS survey team confirmed a brief tornado based on tree damage.[16]
EF0 S of Dover Shawnee KS 38°57′18″N 95°56′15″W / 38.9549°N 95.9376°W / 38.9549; -95.9376 (Dover (May 19, EF0)) 03:08–03:10 0.1 mi (0.16 km) 30 yd (27 m)
Radar indicated a small tornado debris signature.[17]
EF1 W of Shawnee Johnson KS 39°00′55″N 94°50′37″W / 39.0153°N 94.8435°W / 39.0153; -94.8435 (Shawnee (May 19, EF1)) 03:31–03:36 1.75 mi (2.82 km) 105 yd (96 m)
The school concession stand and administrative building were damaged at a high school. Two homes sustained roof damage, including one that loss of its roof decking. Large trees were snapped or uprooted.[18]
EF1 NE of Overland Park Johnson KS 38°59′17″N 94°39′27″W / 38.9881°N 94.6574°W / 38.9881; -94.6574 (Overland Park (May 19, EF1)) 03:39–03:45 2.72 mi (4.38 km) 150 yd (140 m)
NWS Kansas City confirmed an EF1 tornado.[18]
EF1 NW of Waynoka Woods OK 36°39′N 98°58′W / 36.65°N 98.96°W / 36.65; -98.96 (Waynoka (May 19, EF1)) 03:53–03:56 2.6 mi (4.2 km) 300 yd (270 m)
Oil field equipment, outbuildings, and trees were damaged.[15]
EF0 NNW of Waynoka Woods OK 36°39′N 98°56′W / 36.65°N 98.94°W / 36.65; -98.94 (Waynoka (May 19, EF0)) 04:01–04:07 1.5 mi (2.4 km) 30 yd (27 m)
A barn was damaged.[15]

May 20 event

List of confirmed tornadoes – Monday, May 20, 2024[a]
EF# Location County / Parish State Start Coord. Time (UTC) Path length Max width
EF0 NE of Blooming Prairie Dodge MN 43°54′50″N 92°58′30″W / 43.9138°N 92.975°W / 43.9138; -92.975 (Blooming Prairie (May 19, EF0)) 23:18–23:23 0.2 mi (0.32 km) 35 yd (32 m)
A landspout tornado briefly occurred over rural land.[19]
EF0 NW of Hayfield Dodge MN 43°55′02″N 92°56′37″W / 43.9173°N 92.9435°W / 43.9173; -92.9435 (Hayfield (May 19, EF0)) 23:25–23:28 0.2 mi (0.32 km) 50 yd (46 m)
A landspout tornado briefly occurred over rural land.[19]

May 21 event

List of confirmed tornadoes – Tuesday, May 21, 2024[a]
EF# Location County / Parish State Start Coord. Time (UTC) Path length Max width
EF0 NE of Richland Colfax NE 41°29′36″N 97°09′30″W / 41.4934°N 97.1584°W / 41.4934; -97.1584 (Richland (May 21, EF0)) 10:14 0.51 mi (0.82 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF0 WSW of Brainard Butler NE 41°09′04″N 97°03′59″W / 41.1511°N 97.0665°W / 41.1511; -97.0665 (Brainard (May 21, EF0)) 10:20 0.62 mi (1.00 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF0 S of Brainard Butler NE 41°08′53″N 96°59′34″W / 41.148°N 96.9927°W / 41.148; -96.9927 (Brainard (May 21, EF0)) 10:26–10:28 2.04 mi (3.28 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF0 SSW of Inglewood Saunders NE 41°23′46″N 96°30′41″W / 41.396°N 96.5113°W / 41.396; -96.5113 (Inglewood (May 21, EF0)) 10:45 0.39 mi (0.63 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF0 NNW of Coburg Montgomery IA 40°56′N 95°17′W / 40.94°N 95.28°W / 40.94; -95.28 (Coburg (May 21, EF0)) 12:10–12:11 0.69 mi (1.11 km) 40 yd (37 m)
A weak, early-morning EF0 tornado was confirmed by NWS Omaha. Preliminary information [14]
EF0 Northern Yutan Saunders NE 41°14′45″N 96°23′40″W / 41.2457°N 96.3945°W / 41.2457; -96.3945 (Yutan (May 21, EF0)) 17:52 0.22 mi (0.35 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF1 NNE of Alta to NW of Truesdale Buena Vista IA 42°44′44″N 95°16′34″W / 42.7455°N 95.276°W / 42.7455; -95.276 (Alta (May 21, EF1)) 19:30–19:35 1.64 mi (2.64 km) 75 yd (69 m)
A high-end EF1 tornado struck three farmsteads. At the first farmstead, roof panels of an outbuilding were blown off and tree damage occurred. At the second farmstead, the roof of a home was torn off and a garage was shifted off its foundation. Tree damage also occurred here. At the third farmstead, a garage door was blown in and grain bins were damaged.[21]
EF1 Red Oak Montgomery IA 41°00′39″N 95°14′03″W / 41.0108°N 95.2343°W / 41.0108; -95.2343 (Red Oak (May 21, EF1)) 19:35–19:40 2.95 mi (4.75 km) 70 yd (64 m)
An EF1 tornado was confirmed by NWS Omaha. Preliminary information.[20]
EF3 SE of Coburg to E of Stanton to SSE of Massena Page, Montgomery, Adams IA 40°51′22″N 95°12′02″W / 40.8561°N 95.2005°W / 40.8561; -95.2005 (Coburg (May 21, EF3)) 19:43–20:19 32.01 mi (51.52 km) 1,300 yd (1,200 m)
An EF3 tornado was confirmed by NWS Omaha & NWS Des Moines. Preliminary information.[20][22]
EF4+ SSE of Villisca to ENE of Greenfield Page, Taylor, Adams, Adair IA 40°53′12″N 94°57′26″W / 40.8866°N 94.9571°W / 40.8866; -94.9571 (Greenfield (May 21, EF4)) 19:57–20:43 43.98 mi (70.78 km) 1,000 yd (910 m)
5 deaths – See section on this tornado – Initial storm surveys have confirmed EF4 damage in Greenfield and in rural portions of southern Adair County. Preliminary information.[23][24]
EF2 Johnston to SE of Zearing Polk, Story IA 41°40′35″N 93°45′44″W / 41.6765°N 93.7623°W / 41.6765; -93.7623 (Johnston (May 21, EF2)) 21:30–22:05 41.14 mi (66.21 km) 1,000 yd (910 m)
An EF2 tornado was confirmed by NWS Des Moines. Preliminary information.[25]
EF0 E of Calhoun Henry MO 38°28′N 93°35′W / 38.47°N 93.59°W / 38.47; -93.59 (Calhoun (May 21, EF0)) 22:26–22:28 0.3 mi (0.48 km) 50 yd (46 m)
An EF0 tornado was confirmed by NWS Kansas City. Preliminary information.[14]
EF1 N of Verdigris Rogers OK 36°15′18″N 95°42′27″W / 36.255°N 95.7074°W / 36.255; -95.7074 (Verdigris (May 21, EF1)) 22:27–22:36 5.3 mi (8.5 km) 500 yd (460 m)
A number of house roofs were damaged. Numerous trees were snapped or uprooted.[26]
EF1 WSW of Tiawah Rogers OK 36°14′55″N 95°35′10″W / 36.2486°N 95.5862°W / 36.2486; -95.5862 (Tiawah (May 21, EF1)) 22:39–22:41 1 mi (1.6 km) 100 yd (91 m)
A metal carport was destroyed. Trees were snapped or uprooted.[26]
EF1 NE of St. Charles, MN to western Rollingstone, MN to NW of Fountain City, WI Winona (MN), Buffalo (WI) MN, WI 43°58′34″N 92°00′49″W / 43.9761°N 92.0135°W / 43.9761; -92.0135 (Winona (May 21, EF1)) 23:01–23:15 18.28 mi (29.42 km) 50 yd (46 m)
A tornado caused sporadic damage to farmsteads and trees before crossing the Mississippi River into Wisconsin, where it dissipated.[27]
EF1 SE of Cochrane Buffalo WI 44°12′41″N 91°50′24″W / 44.2113°N 91.84°W / 44.2113; -91.84 (Cochrane (May 21, EF1)) 23:13–23:16 3.87 mi (6.23 km) 75 yd (69 m)
A tornado began at the edge of the Mississippi River and caused minor tree damage. Moving northeast, the tornado destroyed a barn and caused more tree damage at a golf course. The tornado destroyed another barn before dissipating.[28]
EF1 NNW of Cochrane to SW of Cream Buffalo WI 44°16′15″N 91°50′56″W / 44.2708°N 91.849°W / 44.2708; -91.849 (Cochrane (May 21, EF1)) 23:17–23:20 2.78 mi (4.47 km) 45 yd (41 m)
An EF1 tornado was confirmed by NWS La Crosse. Preliminary information.[29]
EF1 E of Arcadia Trempealeau WI 44°15′06″N 91°23′23″W / 44.2517°N 91.3898°W / 44.2517; -91.3898 (Arcadia (May 21, EF1)) 23:34–23:35 0.3 mi (0.48 km) 75 yd (69 m)
A very brief tornado struck a residence, destroying a garage and impaling some 2x4s into the residence. The tornado did some tree damage before dissipating.[30]
EF1 NW of North Branch to SW of Humbird Jackson WI 44°27′36″N 91°00′33″W / 44.4599°N 91.0091°W / 44.4599; -91.0091 (North Branch (May 21, EF1)) 23:54–00:02 5.54 mi (8.92 km) 75 yd (69 m)
An EF1 tornado was confirmed by NWS La Crosse. Preliminary information.[31]
EF1 SSW of Unity to SSE of Colby Clark, Marathon WI 44°49′47″N 90°19′32″W / 44.8297°N 90.3256°W / 44.8297; -90.3256 (Unity (May 21, EF1)) 00:34–00:37 4.23 mi (6.81 km) 65 yd (59 m)
A tornado damaged trees and power lines in Unity. On the west side of town, structural damage occurred to homes and garages. Scattered tree damage continued until the tornado lifted.[32][33]
EF1 WSW of Poniatowski Marathon WI 44°57′31″N 90°02′48″W / 44.9586°N 90.0468°W / 44.9586; -90.0468 (Poniatowski (May 21, EF1)) 00:51–00:54 3.57 mi (5.75 km) 60 yd (55 m)
A tornado damaged trees and caused a barn to collapse. Minor structure damage occurred as well.[34]
EF1 Kaukauna Outagamie WI 44°15′59″N 88°17′29″W / 44.2665°N 88.2915°W / 44.2665; -88.2915 (Kaukauna(May 21, EF1)) 01:57–02:01 1.36 mi (2.19 km) 50 yd (46 m)
An EF1 tornado was confirmed by NWS Green Bay. Preliminary information.[35]

May 22 event

List of confirmed tornadoes – Wednesday, May 22, 2024[a]
EF# Location County / Parish State Start Coord. Time (UTC) Path length Max width
EF1 Quinton Pittsburg, Haskell OK 35°07′25″N 95°23′03″W / 35.1235°N 95.3841°W / 35.1235; -95.3841 (Quinton (May 22, EF1)) 14:37–14:44 2.9 mi (4.7 km) 300 yd (270 m)
The roofs of homes were damaged. Trees were snapped or uprooted.[26]
EF1 SSW of Haughton Bossier LA 32°24′02″N 93°33′11″W / 32.4006°N 93.553°W / 32.4006; -93.553 (Haughton (May 22, EF1)) 00:30 0.23 mi (0.37 km) 100 yd (91 m)
An EF1 tornado was confirmed by NWS Shreveport. Preliminary information.[36]

Corning–Greenfield, Iowa

Corning–Greenfield, Iowa
Meteorological history
FormedMay 21, 2024, 2:57 p.m. CDT (UTC−05:00)
DissipatedMay 21, 2024, 3:43 p.m. CDT (UTC−05:00)
Duration46 minutes
EF4+ tornado
on the Enhanced Fujita scale
Highest winds175–185 mph (282–298 km/h)+
Overall effects
Fatalities5+
Injuries35+

A large, violent, multi-vortex tornado impacted the city of Greenfield, Iowa, devastating the town.[2] Multiple homes were damaged or destroyed.[2] At least four fatalities and 35 injuries were reported.[1][37][2] A Doppler on Wheels measured winds up at least >250 miles per hour (400 km/h), "possibly as high as 290 miles per hour (470 km/h)" at 48 yards (44 m) above the surface.[38] Pieter Groenemeijer, the director of the European Severe Storms Laboratory noted that "on the IF-scale, 250 mph measured below 60 m above ground level is IF4 on the IF-scale, 290 mph is IF5."[39] A preliminary survey has confirmed at least EF4 damage in Greenfield.[40]

Impact

Iowa

Several people were killed and dozens injured in Greenfield, Iowa. Hospitals in the Adair County Health System were evacuated.[41] Multiple fatalities and at least a dozen injuries have been confirmed. There is also a curfew in effect indefinitely, and authorities have limited traffic in and out of town.[42]

Notes

  1. ^ a b c d All dates are based on the local time zone where the tornado touched down; however, all times are in Coordinated Universal Time for consistency.

References

  1. ^ a b c Reyna-Rodriguez, Victoria; Kealey, Kate; Sitter, Phillip; Rood, Lee; Lathers, Addison. "Updates: Tornado, storm damage still being felt in Iowa as clean up begins". The Des Moines Register. Retrieved 23 May 2024.
  2. ^ a b c d e f Sutton, Joe; Tucker, Emma; Gilbert, Mary; Shackelford, Robert; Wolfe, Elizabeth (2024-05-21). "Multiple fatalities after tornado rips through rural Iowa city, official says, as severe storms rake the Midwest". CNN. Archived from the original on 2024-05-22. Retrieved 2024-05-22.
  3. ^ Edwards, Roger; Goss, Steve (May 21, 2024). "May 21, 2024 1300 UTC Day 1 Convective Outlook" (Convective Outlook). Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  4. ^ Guyer, Matt; Wendt, Nathan (May 21, 2024). "May 21, 2024 1630 UTC Day 1 Convective Outlook" (Convective Outlook). Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  5. ^ Mosier, Matt (May 21, 2024). "Mesoscale Discussion 868". Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  6. ^ Mosier, Matt; Guyer, Jared (May 21, 2024). "Mesoscale Discussion 869". Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  7. ^ Guyer, Jared (May 21, 2024). "Tornado Watch 276". Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  8. ^ Guyer, Jared (May 21, 2024). "Tornado Watch 277". Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  9. ^ Mosier, Matt (May 21, 2024). "Mesoscale Discussion 875". Norman, Oklahoma: Storm Prediction Center. Retrieved May 22, 2024.
  10. ^ a b "May 21, 2024 Storm Reports". spc.noaa.gov. Storm Prediction Center. Retrieved 2024-05-22.
  11. ^ a b National Weather Service in Wichita, Kansas (May 21, 2024). NWS Damage Survey for 5/19/24 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 21, 2024.
  12. ^ a b National Weather Service in Wichita, Kansas (May 21, 2024). NWS Damage Survey for 5/19/24 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 21, 2024.
  13. ^ National Weather Service in Davenport, Iowa (May 20, 2024). NWS Damage Survey for 05/19/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 20, 2024.
  14. ^ a b c d Cite error: The named reference DAT was invoked but never defined (see the help page).
  15. ^ a b c d e f g National Weather Service in Norman, Oklahoma (May 20, 2024). NWS Damage Survey for 5/19/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 20, 2024.
  16. ^ National Weather Service in Topeka, Kansas (May 20, 2024). NWS Damage Survey for 05/19/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 20, 2024.
  17. ^ National Weather Service in Topeka, Kansas (May 20, 2024). NWS Damage Survey for 05/19/2024 Tornado Event - Update #1 (Report). Iowa Environmental Mesonet. Retrieved May 20, 2024.
  18. ^ a b National Weather Service in Kansas City, Missouri (May 20, 2024). NWS Damage Survey for 05/20/2024 Squall Line Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 20, 2024.
  19. ^ a b National Weather Service in La Crosse, Wisconsin (May 22, 2024). NWS Damage Survey for 5/20/24 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  20. ^ a b c d e f g National Weather Service in Omaha, Nebraska (May 23, 2024). NWS Damage Survey for 05/21/2024 Tornado Event Update #1 (Report). Iowa Environmental Mesonet. Retrieved May 23, 2024.
  21. ^ National Weather Service in Sioux Falls, South Dakota (May 22, 2024). NWS Damage Survey for 05/21/24 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  22. ^ NWS Damage Survey for 05/21/2024 Tornado Event Update #1 (Report). National Weather Service in Des Moines, Iowa. May 23, 2024. Retrieved May 23, 2024 – via Iowa Environmental Mesonet.
  23. ^ National Weather Service in Des Moines, Iowa (May 23, 2024). NWS Damage Survey for 05/21/2024 Tornado Event Update #2 (Report). Iowa Environmental Mesonet. Retrieved May 23, 2024.
  24. ^ Fingerhut, Hannah; Beck, Margery A. (May 22, 2024). "5 dead and at least 35 hurt as tornadoes ripped through Iowa, officials say". Associated Press. Retrieved May 23, 2024.{{cite news}}: CS1 maint: url-status (link)
  25. ^ National Weather Service in Des Moines, Iowa (May 22, 2024). NWS Damage Survey for the 05/21/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  26. ^ a b c National Weather Service in Tulsa, Oklahoma (May 22, 2024). NWS Damage Survey for 05/21-22/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  27. ^ National Weather Service in La Crosse, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  28. ^ National Weather Service in La Crosse, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  29. ^ National Weather Service in La Crosse, Wisconsin (May 23, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 23, 2024.
  30. ^ National Weather Service in La Crosse, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  31. ^ National Weather Service in La Crosse, Wisconsin (May 23, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 23, 2024.
  32. ^ National Weather Service in La Crosse, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  33. ^ National Weather Service in Green Bay, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  34. ^ National Weather Service in Green Bay, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  35. ^ National Weather Service in Green Bay, Wisconsin (May 22, 2024). NWS Damage Survey for 05/21/2024 Severe Weather Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  36. ^ National Weather Service in Shreveport, Louisiana (May 23, 2024). NWS Damage Survey for 05/22/24 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 23, 2024.
  37. ^ "Greenfield tornado: Authorities confirm multiple fatalities in southwest Iowa". KCCI. May 22, 2024. Archived from the original on May 22, 2024. Retrieved May 22, 2024.
  38. ^ Wurman, Joshua; Kosiba, Karen (22 May 2024). "Very prelim analysis of DOW data show >250 mph peak winds, possibly high as 290, at 44 m (144 ft) above ground in Greenfield, IA. Tornado very intense & also very small, so worst winds were in narrow swath. Raw data from DOW7 (L); Prelim DOW-measured center path. POD blue dot (R)" (Post on 𝕏). 𝕏 (Formerly Twitter). University of Illinois: Doppler on Wheels. Archived from the original on 22 May 2024. Retrieved 22 May 2024.
  39. ^ Groenemeijer, Pieter (22 May 2024). "Impressive measurement! On the IF-scale, 250 mph measured below 60 m above ground level is IF4 on the IF-scale, 290 mph is IF5" (Post on 𝕏). 𝕏 (Formerly Twitter). European Severe Storms Laboratory. Archived from the original on 22 May 2024. Retrieved 22 May 2024.
  40. ^ National Weather Service in Des Moines, Iowa (May 22, 2024). NWS Damage Survey for 05/21/2024 Tornado Event (Report). Iowa Environmental Mesonet. Retrieved May 22, 2024.
  41. ^ Cite error: The named reference NYTimesInfo was invoked but never defined (see the help page).
  42. ^ Rood, Kyle Werner and Lee. "Deaths, extensive damage in Greenfield after a powerful tornado rips through town". The Des Moines Register. Retrieved 2024-05-22.
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