Storms moved across portions of central Missouri with heavy rainfall. There were a few reports of flash flooding due to the heavy rain.
Every event with a place to put it. Tap one for its entry below.
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.
Storms moved across portions of central Missouri with heavy rainfall. There were a few reports of flash flooding due to the heavy rain.
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 Aug 29, 9:52 AM CST, 8 minutes earlier.
Area Forecast Discussion...Updated National Weather Service Saint Louis MO 1052 AM CDT Wed Aug 29 2018 .UPDATE... Issued at 1035 AM CDT Wed Aug 29 2018 A low level jet continues to pump moisture into the srn half of the CWA this morning as a s/w pulls eastward thru the region. Expect the heavy rainfall to continue over the next couple of hours and weaken by early afternoon as the low level flow diminishes. Rainfall amounts of nearly 4 inches, estimated by RADAR, has already fallen across portions of Osage and Gasconade Counties. Another localized 2 to 4 inches of rainfall are possible across srn portions of the CWA, which are already primed due to rainfall earlier this morning. Therefore, additional Flash Flood Warnings may be needed, especially as another cluster of cells moves east into the area. Be sure to stay tuned to the latest warnings for the latest information. Tilly && .SHORT TERM... (Through Late Tonight) Issued at 400 AM CDT Wed Aug 29 2018 The immediate focus will be the complex of showers and thunderstorms currently marching through the forecast area. Chances for showers and thunderstorms will slowly push south through Wednesday with a bit of a break in action Wednesday night. A cold front remains draped across the region from northern Illinois into northwest Missouri. Along and ahead of the front, showers and thunderstorms with embedded pockets of heavy rain and some frequent lightning are ongoing. Though gusty winds are possible within the strongest storms, they have generally remained in check up to around 25 mph or so. The main outflow has continued to race out well ahead of the complex further stabilizing the environment ahead of the line. This could be seen entering the northern tier of the CWA around 7z and into the norther half prior to 8z. Additional outflow boundaries can be seen running just ahead of individual line from Pittsfield, IL to Mexico, MO with a brief period of gusty winds as the line presses east. At 330am, the IR satellite depicted the coldest cloud tops approximately around Quincy, IL with the most extensive cloud cover running to the northeast into the Great Lakes. This is where radar places some of the heaviest rain and strongest thunderstorms, co- located with a vortex feature just east of Quincy. While some storms have looked strong at times, overall trends at the moment continue to show weakening, as the front as a whole slowly marches south. Anticipate showers and thunderstorms, in a weaker variety and more than likely non-severe, to approach the St. Louis area a couple of hours before sunrise. The front will then be positioned across the southern sections of MO/IL during the early afternoon. Additional storms will likely fire near along the front over far southern reaches of the CWA with overcast skies through at least the early part half of the day from central MO to southwest IL. Surface high pressure builds in through the late afternoon and evening with drier air and quieter conditions for the overnight period. Due to extensive cloud cover during the day, high temperatures were trimmed back a few degrees to the upper 70s and lower 80s. Clouds will thin a bit late this afternoon and possibly clear out over northeast MO and west-central IL tonight. This along with drier air should allow for a much more comfortable night with lows falling into the mid to upper-50s in northeast MO, to the mid- 60s over southwest IL. Maples .LONG TERM... (Thursday through Tuesday) Issued at 400 AM CDT Wed Aug 29 2018 The intrusion of westerlies aloft at the beginning of this period will temporarily break the hold of the upper RIDGE that was driving the late summer high heat for the past several days. In addition, this flow will also bring some upper level disturbances into our region. This will combine with what should overall be a favorable setup at the surface for persistent rain chances with an old frontal boundary to our south that will slowly be edging northward as a warm front. A period of seasonable or even slightly below normal temps can also be expected for Thursday and Friday. How long these rain chances persist over our region beyond Friday will continue to depend on which model's re-establishment of the upper RIDGE is preferred. Model guidance continues to be split on how fast to get the upper RIDGE going over our region again. The EC has been consistent on being the fastest, delivering the SW flow aloft to drive the warm front north of our area on Saturday and then maintaining this thru a large chunk of next week. The GFS has had a bit of a wet bias this summer and this shows for this period, with this model stubbornly holding on to the westerlies until Monday, two days later. The CMC has edged more in preference to the GFS. This continues to be a significant discrepancy which will result in hanging on to mentionable PoPs for most areas into early next week. Above average temps will continue to be forecast from Saturday onward, they could be higher still if the EC's depiction proves correct, and this in turn, could get another heat event going. TES && .AVIATION... (For the 12z TAFs through 12z Thursday Morning) Issued at 646 AM CDT Wed Aug 29 2018 A cold front currently stretching from northeast Illinois into central Missouri will continue to push south and east through the morning and early afternoon. Showers and thunderstorms along the front will include pockets of heavy rain, locally gusty winds and brief drop to MVFR visibilities. Just ahead of the front, south and southwest winds may briefly be a bit chaotic around thunderstorms and heavy rain. Surface observations show winds veering out of the northwest behind the front, which will be a gradual north to south shift from this morning through this afternoon. Cigs are dropping to IFR and LIFR level just behind the front, but this should only last a few hours, before gradually lifting back through MVFR late this afternoon and evening. VFR is then expected overnight tonight with a more cloud cover and stray shower well south of St. Louis and clearing skies north of the metro area. SPECIFICS FOR KSTL: Convection continues to push through the area this morning with locally heavy rain and cigs briefly dropping to MVFR and localized pockets of IFR. Thunderstorm are expected to move out of the general vicinity of the terminal over the next few hours with a few lingering showers and a gradually shift in winds out of the west and northwest. A few hours of IFR cigs are likely just behind the front before conditions gradually improve late this afternoon. Winds will become light and variable overnight with VFR conditions from this evening extending through tonight. Maples && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
Hazardous Weather Outlook National Weather Service Saint Louis MO 437 AM CDT Wed Aug 29 2018 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-301200- 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- 437 AM CDT Wed Aug 29 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 many areas today. Isolated strong to severe storms will be possible today for areas around the Saint Louis metro area and areas to the south and east. Damaging winds will be the primary threat. The chance for thunderstorms then shifts into portions of southeast Missouri and far southern Illinois tonight. Widespread severe weather is not anticipated tonight. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The chance for thunderstorms will continue for portions of the area each day through Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today for the Saint Louis metro area and areas to the south and east. Spotters are also encouraged to report rainfall amounts in excess of two inches or any flooding, if observed, to the National Weather Service. TES
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
910 AM CDT WED AUG 29 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0910 AM HEAVY RAIN 4 ESE DRAKE 38.45N 91.40W
08/29/2018 M1.43 INCH GASCONADE MO CO-OP OBSERVER
STORM TOTAL SO FAR FOR THIS EVENT.
&&
CMKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
1006 AM CDT WED AUG 29 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1005 AM HEAVY RAIN JEFFERSON CITY 38.58N 92.19W
08/29/2018 E1.60 INCH COLE MO TRAINED SPOTTER
STORM TOTAL SO FAR IN WEST JEFFERSON CITY.
&&
CMKPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
1013 AM CDT WED AUG 29 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1011 AM HEAVY RAIN HOLTS SUMMIT 38.65N 92.12W
08/29/2018 M2.50 INCH CALLAWAY MO TRAINED SPOTTER
&&
CMKThe St Louis radar (KLSX), 111 km away, was scanning. The volume nearest the first event began at 16:00 UTC.
1 flash flood. Local standard time, as filed.
Up to four inches of rain fell in a short amount of time causing flash flooding. Several roads were flooded and numerous creeks were out of their banks in the southeastern portions of Osage County.
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, August 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: 783355.