Several rounds of storms moved through Randolph County Illinois causing flash flooding.
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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.
Several rounds of storms moved through Randolph County Illinois causing flash flooding.
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 Jul 15, 11:48 AM CST, 2 hours 51 minutes earlier.
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 1248 PM CDT Sun Jul 15 2018 .SHORT TERM... (Through Late Tonight) Issued at 345 AM CDT Sun Jul 15 2018 Still getting scattered showers and a few storms early this morning across central and southeast MO and southwest IL, but activity is not as strong as it was in the evening. Most areas just getting light showers or at most a brief period of heavy downpours. More convection can be expected today as a shortwave over northwest IL drops southeastward and an MCV over west central MO shifts slowly east-southeastward. Most of the convection should be across central and southeast MO and southwest IL this morning, with convective initiation gradually shifting southeastward with time and mainly confined to southeast MO and southwest IL this afternoon. Highs today will not be as hot as yesterday and only slightly above normal, although it will continue to be quite humid. Only isolated showers and storms are expected tonight ahead of an approaching cold front as drier and more stable mid level air advects southward through our area behind the shortwave. GKS .LONG TERM... (Monday through Saturday) Issued at 345 AM CDT Sun Jul 15 2018 The synoptic pattern at the start of the long term period will feature fairly weak flow aloft, with the region in generally zonal to weak WNW flow aloft. This regime will transition to more of northwest flow by the middle and end of the week as a trough amplifies across the Northeast. Monday will feature a surface cold front pushing through the region. It appears the best co-location of maximum daytime heating and surface convergence along the frontal surface will generally be along/south of I-70, thus have focused the highest pops there. Monday will mark the last hot day across the region as highs climb into the upper 80s/low 90s. Monday night into Tuesday will mark the arrival of a much more pleasant airmass. The front will have moved south of the area, allowing dewpoints in the low to mid 60s to filter in which should limit any thunderstorm development. This airmass will remain in place through at least Wednesday, providing a nice little break in the heat we've seen of late. Wednesday night into Thursday will mark the return of shower/storm chances back into the forecast. A low-level jet will focus into an approaching warm front, which should lead to the development of showers/storms Wednesday night through Friday, although temperatures don't look to be nearly as hot as they have been. Deitsch && .AVIATION... (For the 18z TAFs through 18z Monday Afternoon) Issued at 1234 PM CDT Sun Jul 15 2018 Main focus for storms will stay south of the terminals this afternoon, but isolated to widely scattered storms are possible through this afternoon across much of the area. Decreasing clouds are likely tonight so may see some fog development roughly along and east of the Mississippi River. Maintained TEMPO groups at KUIN, KSUS, and KCPS. SPECIFICS FOR KSTL: A few storms may develop across the St. Louis metro area through mid afternoon so have a VCTS group in at Lambert until 2100 UTC. Rest of TAF period looks fairly tranquil with dry/VFR conditions favored. A weak front will very slowly move through the terminal Monday morning with light/variable winds becoming northwesterly. Gosselin && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous Weather Outlook National Weather Service Saint Louis MO 328 AM CDT Sun Jul 15 2018 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-160830- 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- 328 AM CDT Sun Jul 15 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 Scattered thunderstorms are possible today. These storms are not expected to be severe, but could contain frequent lightning and locally gusty winds. .DAYS TWO THROUGH SEVEN...Monday through Saturday There is a chance of thunderstorms for portions of the area from Monday. There is also a chance of thunderstorms from Wednesday night through Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. Deitsch
The St Louis radar (KLSX), 100 km away, was scanning. The volume nearest the first event began at 20:39 UTC.
1 flash flood. Local standard time, as filed.
Up to three inches of rain fell onto already saturated soils causing flash flooding. Numerous roads in Ruma were flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2018Every state in 2018This day in weather historyWarnings in Illinois, July 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: 780926.