A cold front moved through the region triggering showers and thunderstorms. One of the storms produced damaging winds in Shelby County, Missouri.
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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 LSX wrote it up.
A cold front moved through the region triggering showers and thunderstorms. One of the storms produced damaging winds in Shelby County, Missouri.
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 St. Louis, MO wrote its last area forecast discussion before the first event at Jun 20, 2:41 PM CST, 3 minutes earlier.
Area Forecast Discussion National Weather Service Saint Louis MO 341 PM CDT Wed Jun 20 2018 .SHORT TERM... (Through Late Thursday Afternoon) Issued at 230 PM CDT Wed Jun 20 2018 Atypical June setup with upper low currently over nern NEB. Thunderstorms have developed ahead of a cdfnt across north central MO stretching swwd to SW MO. This front will move east slightly this evening before stalling until a reinforcing cdfnt pushes into the area. As the nearly stacked low approaches, the cdfnt will slowly push thru the area. The cdfnt is expected to be roughly from KIJX to KSTL to KFAM around 18z Thurs and continue to push thru the CWA during the afternoon. Expect the broken line of TSRA to continue to slowly move east into the area, as well as area of SHRA further SE. These storms are expected to diminish late this evening, before redeveloping and moving out of the area during the pre-dawn hours. Thunderstorm development on Thurs will largely depend on the location of the cdfnt. Believe the best coverage during the late morning and into early afternoon will be across ern portions of the CWA, ahead of the cdfnt. Another area of showers with isod to sct thunder is expected with the low as it approaches the area. With the setup expected, believe there will be a threat of low- topped supercells on Thurs afternoon. Looks like two areas possible, one across SW IL, but another area will be possible across nrn MO into west central IL along the occluded front. Mdls are suggesting to around 1000 J/kg of MUCAPE associated with the occluded fnt. This setup will need to be monitored for future updates as the system evolves and details of frontal location become more confident. As for temps, have trended twd the warmer guidance ahead of the expected front location, with much cooler temps behind given the expected precip and cloud cover. Tilly .LONG TERM... (Thursday through Tuesday) Issued at 340 AM CDT Wed Jun 20 2018 The upper LO will continue tracking slowly southeastward, into northern MO by late Thursday afternoon, thru the STL metro area Friday morning and into southeastern IL by late Friday afternoon. This will be a primary driver of our weather for this time period, with generally high PoPs (peaking during the afternoon and early evening) and an even cooler stretch of daytime temperatures. While severe thunderstorm potential will be low Thursday and Friday with low CAPE (less 1000 J/kg MLCAPE) for this time of year, shear will be bit higher thanks to mechanical mixing around the upper LO and adding in enhanced cyclonic flow, potential for cold air funnels does appear to be higher for those days and could be the main severe threat, such as it is. In the wake of the upper LO passing to our east, the surface cold front should finally make its push thru our region and settle just to our south for the weekend. A zonal flow is expected to exist aloft and will continue to shuffle along upper level disturbances to maintain a steady rain threat for the weekend, but mainly in southern MO. Already by early next week, the upper RIDGE will begin to re-assert itself into the central CONUS to remind us that we are now officially in astronomical summer, with another round of showers and thunderstorms expected as a surface warm front moves thru at this time. Thanks to an upper LO sliding thru Thursday and Friday and being on the cool side of a front for much of the upcoming weekend, look for daytime max temps to be at or...wait for it...BELOW AVERAGE...thru the weekend with a return to above average temps for early next week. TES && .AVIATION... (For the 18z TAFs through 18z Thursday Afternoon) Issued at 1230 PM CDT Wed Jun 20 2018 Isod TSRA have developed across the region early this afternoon. Coverage will continue to increase thru the afternoon hours. The best chances, and what the TAFs focus on, will be what is expected to be a broken line of storms ahead of an approaching cdfnt late this afternoon and into the early evening hours. A second brief round of storms is expected late tonight at KUIN/KSUS/KCPS. Redevelopment is expected again Thurs morning along the front. However, at this time, this redevelopment is expected to be east of the terminals. Otherwise, moisture transport into the region is expected to support MVFR cigs late tonight into Thurs morning. Some uncertainty remains and going cig forecast may be too high. SPECIFICS FOR KSTL: TSRA coverage is expected to continue to increase thru the afternoon hours. Best chances for TSRA is early this evening, however, brief impacts earlier from storms is also possible. Otherwise, expect MVFR cigs to move into the region later tonight and shud lift Thurs morning. Tilly && .PRELIMINARY POINT TEMPS/POPS... Saint Louis 72 85 65 78 / 60 60 50 60 Quincy 67 77 63 75 / 80 60 40 50 Columbia 67 77 61 75 / 80 60 40 40 Jefferson City 68 78 62 76 / 80 60 40 40 Salem 69 84 64 78 / 60 70 60 60 Farmington 68 83 62 77 / 50 60 40 50 && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous Weather Outlook National Weather Service Saint Louis MO 400 AM CDT Wed Jun 20 2018 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-211200- Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- 400 AM CDT Wed Jun 20 2018 This hazardous weather outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Today and Tonight Thunderstorms will be likely for most areas, mainly during the late afternoon and evening hours. Isolated severe storms will also be possible during this time, mainly during the afternoon and early evening hours, with damaging winds the primary threat, but large hail will also be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a chance for thunderstorms across at least a portion of the area each day. Isolated severe storms will be possible Thursday afternoon and early evening. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed during the afternoon and early evening hours. TES
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
232 PM CDT WED JUN 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0726 PM FLOOD MAPLEWOOD 38.62N 90.33W
06/19/2018 ST. LOUIS MO BROADCAST MEDIA
LACLEDE STATION ROAD AND ADJACENT PARKING
LOTS FLOODED LIKELY DUE TO FLOODWATERS FROM
HAMPTON BRANCH. TIME ESTIMATED FROM PICTURES
AND RADAR IMAGERY.
&&
JPGThe St Louis radar (KLSX), 174 km away, was scanning. The volume nearest the first event began at 20:44 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew the roof off of a machine shed. Some pieces of the roof were blown 200 yards away into the nearby cornfield. This occurred about two miles south of Kellerville, MO.
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, June 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: 767511.