Late in the evening a line of strong storms moved into western Missouri, bringing some marginally severe thunderstorm winds, and some isolated damage to the area.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EAX wrote it up.
Late in the evening a line of strong storms moved into western Missouri, bringing some marginally severe thunderstorm winds, and some isolated damage to the area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Kansas City, MO wrote its last area forecast discussion before the first event at May 8, 10:24 PM CST, 11 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Kansas City/Pleasant Hill MO 1124 PM CDT Sat May 8 2021 .Mesoscale Discussion... Issued at 1122 PM CDT SAT MAY 8 2021 The line of storms is entering into the western side of the CWA. The southern edge of this line has been tracking along the warm front and CAPE boundary as the entire complex moves toward the south and east. The complex is quickly organizing into a bow as it approaches the KC metro. As the low level jet ramps up, storms along the southern edge of the boundary (south of St Joe and Chillicothe) are most likely to retain strong to severe characteristics. Wind is still the primary hazard with reports of 70 MPH winds in some storms. High shear and helicity values ahead of the line coupled with its fast motion still present the possibility for spins ups along the leading edge of the bow. Quarter sized hail and flash flooding of creeks, streams, and impervious surfaces are possible as well. && .Discussion... Issued at 300 PM CDT SAT MAY 8 2021 Key Messages: 1) A severe MCS/squall line is expected to move out of northeast Kansas late this evening and through the KC metro between roughly 11 PM tonight and 3 AM Sunday morning before weakening as it continues toward central Missouri. 2) The primary hazard will be strong straight line wind gusts along the leading edge of the squall line. Widespread gusts of 40 to 50 mph will be likely with a few gusts as high as 60 to perhaps even 70 mph. Hail will likely range from pea size to quarter size. A brief tornado or two also cannot be ruled out. 3) Rainfall totals will likely range from 1 to 1.5" leading to some urban and small stream flooding concerns. Discussion: Water vapor imagery this afternoon shows ascent out ahead of the approaching mid level shortwave trough across the South Central Plains with the center of the surface low currently located over northwest Kansas. A warm front extends eastward from this surface low across northern Kansas and through Kansas City down toward the Lake of the Ozarks. As such, the temperatures south of the warm front are around 75 degrees with mostly clear skies while north of the warm front is much cooler and socked in under a low to mid level cloud deck. This warm front may draw a bit further north through the day today before stalling out somewhere along a St. Joseph to Boonville line. Convective initiation is expected near the surface low across north central Kansas this afternoon. Storms will move eastward and grow upscale into a squall line/MCS by late evening as it approaches our area. The low level jet will increase late tonight as the squall line approaches, which should help keep the squall line severe through the St. Joseph to KC metro with up to 1500 to 2000 J/kg of ML CAPE. Low level wind shear will also be quite strong, with 0-1 km and 0-3 km bulk shear likely exceeding 40 knots. Severe straight line wind gusts will be the primary threat as CAMs indicate that bowing segments will be probable. Also given the very strong low level wind shear and the presence of an east/west quasi stationary warm frontal boundary, a couple brief tornadoes will be possible. While hail will not be the main threat, pea size to perhaps even quarter size hail will be possible. CAM guidance continues to suggest the severe MCS/squall line entering the west/northwest side of the KC metro by around 11 PM to midnight tonight, moving through the metro by around 2 AM Sunday morning before weakening as it travels toward the Ozarks and central Missouri. Rainfall totals will likely range from 1 to 1.5", potentially leading to some urban and small stream flooding issues. All residual shower and thunderstorm activity should exit east of the region by Sunday morning. Sunday afternoon will be chilly with plenty of cold air advection and cloud cover behind the passing trough, with temps in the low 50s. Cooler than normal temperatures will persist into mid to lake week before finally getting back into the 70s by the weekend. There will be a couple slight chances for showers around mid week, but no significant rain is expected through next work week. && .Aviation...(For the 00Z TAFS through 00Z Sunday Evening) Issued at 652 PM CDT SAT MAY 8 2021 VFR conditions are expected to remain at the terminals for the next couple of hours. A squall line moves through the region during the overnight hours. Isolated showers and thunderstorms, some strong, are expected ahead of the squall; however the most impactful storms are expected to move through STJ around 03Z- 05Z with impacts at MCI/MKC/IXD around 04-07Z. Significant impacts to CIGs and VIS are expected as well as very gusty winds approaching 35-45 kts within storms. Frequent lightning and around quarter size hail are expected within the line. Rain lingers behind the squall for few hours clearing before sunrise. Low clouds remain over the region keeping CIGs under 2500ft for the remainder of the period. && .EAX WATCHES/WARNINGS/ADVISORIES... KS...NONE. MO...NONE. && Mesoscale...Pesel Discussion...BMW Aviation...Pesel
Hazardous Weather Outlook National Weather Service Kansas City/Pleasant Hill MO 155 PM CDT Sat May 8 2021 KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040- 043>046-053-054-091900- Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte-Johnson KS- Atchison MO-Nodaway-Worth-Gentry-Harrison-Mercer-Putnam-Schuyler- Holt-Andrew-De Kalb-Daviess-Grundy-Sullivan-Adair-Buchanan-Clinton- Caldwell-Livingston-Linn MO-Macon-Platte-Clay-Ray-Carroll-Chariton- Randolph-Jackson-Lafayette-Saline-Howard-Cass-Johnson MO-Pettis- Cooper-Bates-Henry- 155 PM CDT Sat May 8 2021 This hazardous weather outlook is for northwest...north central and west central Missouri...as well as extreme eastern Kansas. .DAY ONE...This Afternoon and Tonight Storms are expected to affect the area tonight, mainly after 9 PM. Some storms are expected to produce damaging winds up to 70 mph and large hail up to the size of half dollars however an isolated tornado cannot be ruled out. In addition to the severe weather, heavy rainfall will be possible with these storms with 1 to locally 3 inches of rain. This may lead to localized flash flooding and minor river flooding. More detailed information can be accessed at... https://www.weather.gov/eax/hwo .DAYS TWO THROUGH SEVEN...Sunday through Friday Hazardous weather is not expected at this time. More detailed information can be accessed at... https://www.weather.gov/eax/hwo
The Pleasant Hill radar (KEAX), 86 km away, was scanning. The volume nearest the first event began at 04:33 UTC.
5 thunderstorm wind. Local standard time, as filed.
A tree fell onto a home near Weston, requiring response from local fire department.
A 60 mph wind gust was reported near the intersection of HWY 169 and State Route W.
A tree was reported down just east of Smithville. It is unknown what kind of tree, or how big it was.
A couple trees were down in Watkins Mill State Park.
Property owner near Cowgill reported a few 1 to 2 foot diameter trees down, along with some shingle damage to the roof of the home and a metal roof peeled back on the barn.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2021Every state in 2021This day in weather historyWarnings in Missouri, May 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 959956, 959961, 959957, 959958, 959960.