A thunderstorm complex dropped east southeast out of Nebraska and produced some gusty winds near Maryville.
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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.
A thunderstorm complex dropped east southeast out of Nebraska and produced some gusty winds near Maryville.
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 Sep 20, 5:30 PM CST, 3 hours 30 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Kansas City/Pleasant Hill MO 630 PM CDT Thu Sep 20 2018 .Discussion... Issued at 313 PM CDT THU SEP 20 2018 Little change to current forecast. Moderate to high confidence for a line of convection to evolve along a cold front over southeast Nebraska into north central Kansas between 21-23Z. The initial development and a couple hours post-CI will provide the most likely window for strong to severe weather - which will be located mainly to the north and west of the forecast area. A broken line of convection, likely driven by cold pool outflow air, is expected to enter the area around 02-03Z. While deep layer shear will be strong, the available instability will be waning with the loss of daytime heating. Additionally, storm organization is anticipated to be in a weakening phase driven by localized cold pools. The best chance for strong to isolated severe storms in our forecast area will be located over far northwest Missouri into far northeast Kansas, where storms will first arrive. With cold outflow air likely established and a strong wind field located just above the surface, the primary threat will be in the form of gusty thunderstorm winds up to 40-50 mph with localized stronger gusts, especially if more robust convection can translate stronger winds towards the surface within the downdraft region. Overall upper system support progressively lifts off to the northeast, and with decreasing convective organization, rainfall will become more scattered with time overnight into Friday morning, exiting the area by sunrise. The other story will be the end of summer- like temperatures and the arrival of pleasant fall readings. Look for highs on Friday to be in the middle 60s to middle 70s, with highs generally in the 70s through the remainder of the forecast period. && .Aviation...(For the 00Z TAFS through 00Z Friday Evening) Issued at 630 PM CDT THU SEP 20 2018 Currently, a line of strong thunderstorms associated with a cold front is pushing eastward through eastern Nebraska and central Kansas. Anticipate timing of thunderstorms to impact TAF sites between 03Z-05Z with the strongest convection remaining confined to far northern Missouri counties. Gusty southerly winds will quickly shift to the northeast as the cold front moves through the area. After sunrise, expect VFR conditions and northerly winds to continue for the remainder of the TAF period. && .EAX WATCHES/WARNINGS/ADVISORIES... KS...NONE. MO...NONE. && Discussion...Blair Aviation...Leighton/Otto
Hazardous Weather Outlook National Weather Service Kansas City/Pleasant Hill MO 433 AM CDT Thu Sep 20 2018 KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040- 043>046-053-054-210945- 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- 433 AM CDT Thu Sep 20 2018 This hazardous weather outlook is for northwest...north central and west central Missouri...as well as extreme eastern Kansas. .DAY ONE...Today and Tonight .Heat... Unseasonably hot and humid conditions will continue today. Afternoon highs will reach the mid 90s. Heat index values will climb into the upper 90s and lower 100s. .Thunderstorms... Thunderstorms will develop along a frontal boundary in Iowa and eastern Nebraska, moving into northwestern and northern Missouri in the late evening and continuing overnight. A few strong to possibly severe storms may develop in far northern Missouri. Wind will be the primary concern. The risk for strong to severe storms will diminish quickly through the overnight hours. .DAYS TWO THROUGH SEVEN...Friday through Wednesday .Thunderstorms... Shower and thunderstorm chances will linger through the morning hours, Friday, across portions of central and southern Missouri and eastern Kansas. The next chance for thunderstorms will be Monday night into Tuesday. More detailed information can be accessed at... https://www.weather.gov/eax/hwo
Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
827 PM CDT THU SEP 20 2018
MOZ001-002-011-210215-
Atchison MO-Holt MO-Nodaway MO-
827 PM CDT THU SEP 20 2018
...SIGNIFICANT WEATHER ADVISORY FOR ATCHISON...NORTHWESTERN HOLT AND
NORTHWESTERN NODAWAY COUNTIES UNTIL 915 PM CDT...
At 826 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Emerson to near Nebraska City to near Pawnee
City. Movement was east at 40 mph.
Wind gusts up to 50 mph will be possible with these storms.
Locations impacted include...
Tarkio, Rock Port, Fairfax, Burlington Junction, Craig, Rockport,
Clearmont, Elmo, Westboro, Watson, Quitman, Corning, Phelps City and
Indian Cave State Park.
This includes Interstate 29 between mile markers 92 and 123.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northwestern Missouri.
LAT...LON 4057 9495 4040 9503 4013 9542 4018 9548
4024 9547 4026 9555 4030 9556 4032 9561
4031 9566 4034 9562 4041 9566 4046 9564
4046 9568 4048 9570 4054 9565 4056 9568
4052 9571 4052 9575 4058 9577
TIME...MOT...LOC 0126Z 283DEG 34KT 4102 9543 4061 9591 4013 9620
LeightonSpecial Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
928 PM CDT THU SEP 20 2018
MOZ001>003-011-012-210315-
Atchison MO-Worth MO-Holt MO-Nodaway MO-Andrew MO-
928 PM CDT THU SEP 20 2018
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WORTH...EASTERN
ATCHISON...HOLT...NODAWAY AND NORTHWESTERN ANDREW COUNTIES UNTIL 1015
PM CDT...
At 928 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Clarinda to near Morrill. Movement was
east at 40 mph.
Wind gusts up to 50 mph will be possible with these storms.
Locations impacted include...
Maryville, Tarkio, Mound City, Oregon, Fairfax, Burlington Junction,
Hopkins, Ravenwood, Maitland, Skidmore, Forest City, Craig, Fillmore,
Barnard, Sheridan, Parnell, Bolckow, Graham, Clearmont and Elmo.
This includes Interstate 29 between mile markers 63 and 104.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northwestern Missouri.
LAT...LON 4057 9451 3990 9497 3990 9502 3986 9504
3987 9513 3991 9515 3991 9521 3994 9520
3998 9529 4001 9532 4004 9542 4007 9539
4012 9539 4018 9548 4024 9547 4027 9554
4058 9529
TIME...MOT...LOC 0228Z 276DEG 33KT 4078 9501 3997 9567
LeightonThe Omaha radar (KOAX), 162 km away, was scanning. The volume nearest the first event began at 03:00 UTC.
1 thunderstorm wind. Local standard time, as filed.
A 61 mph wind gust was measured near Maryville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2018Every state in 2018This day in weather historyWarnings in Missouri, September 2018
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: 786655.