A stalled front in the area and rich moisture content in the atmosphere led to thunderstorms with heavy rainfall which produced flooding. There were a few severe thunderstorms with large hail and damaging wind reports.
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 SGF wrote it up.
A stalled front in the area and rich moisture content in the atmosphere led to thunderstorms with heavy rainfall which produced flooding. There were a few severe thunderstorms with large hail and damaging wind reports.
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 Springfield, MO wrote its last area forecast discussion before the first event at Aug 18, 1:11 PM CST, 2 hours 44 minutes earlier.
Area Forecast Discussion National Weather Service Springfield MO 211 PM CDT Fri Aug 18 2017 .SHORT TERM...(This evening through Saturday) Issued at 131 PM CDT Fri Aug 18 2017 A weak shortwave moving across the area this afternoon was trying to aid in developing some showers and storms across along I-49. This activity may increase in coverage and intensity as we go through the afternoon hours as noted by the HRRR. The short term models have struggled with this development through the morning hours however but will keep monitoring this through the afternoon. MLCAPE values of around 2000 j/kg and 25kts 0-6km shear could allow for some stronger storms to develop in the near term along the MO/AR border in sw MO. Short and medium range models do continue to show a complex of storms developing and moving across the Ozarks late this evening into overnight. A few models like the GFS and ECMWF have rainfall developing as early as 21z along the I-49 corridor with the rainfall spreading east overnight. Other models hold all the rain off until after midnight. Overall, thinking that mid evening will be the best timing for rain and storms to develop and move east with initiation along I-49 seeming the best potential location. Current forecasts from both SPC and WPC indicate slight risks for severe storms and flooding rain respectively across southeastern Kansas and western into central Missouri respectively. The flooding potential will be contingent on training storm development. If this occurs some locations could see 2 to 3 inches of rainfall. Current mesoscale date across eastern Kansas and western Missouri has nearly 3000j/kg of cape across the area with dewpoints in the low to middle 70's with several shortwaves expected to move across the area this evening and overnight. there will be the potential for some strong to severe storm development. Primary concerns will be damaging winds but hail to quarters in size will also be possible. Some showers and storms are expected to linger across the southwestern half of the Ozarks through much of the day though coverage and duration should be limited. Despite the cloud cover expected for tomorrow, temperatures should climb into the middle to upper 80s similar to todays forecast. .LONG TERM...(Saturday Night through Friday) Issued at 131 PM CDT Fri Aug 18 2017 The unsettled and active patter will continue to bring shower and thunderstorm chances to the Ozarks Saturday night through the middle of next week. The upper level flow pattern will transition from southwesterly flow this weekend to northwesterly flow aloft for the middle of the week with upper level ridging moving over the area by the end of the week. In general, there is potential for showers and thunderstorms nearly each day through Wednesday. By next weekend, there is the potential for additional rainfall but this is quite a was out in the extended forecast. Another note on next week's forecast will be the near normal temperatures expected to start next week with highs around 90 and heat index values around the 100 degree make Monday and Tuesday. The pattern changes previously discussed will change by the end of the week and temperatures by Wednesday through the end of next week will again be 5 to 10 degrees below normal for August with highs in the lower 80s. && .AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon) Issued at 1241 PM CDT Fri Aug 18 2017 KSGF/KJLN/KBBG: A weak upper level disturbance moving across the area now may kick off a few showers/isolated thunderstorms, but so far coverage has been very sparse. Additional chances are expected late in the taf period near a weakening frontal boundary, but much of this activity will be north of the taf sites. In general, expect VFR conditions, but mvfr/ifr visibility will be possible late tonight toward 12z where the sky can remain clear with light winds. && .SGF WATCHES/WARNINGS/ADVISORIES... MO...NONE. KS...NONE. && SHORT TERM...Hatch LONG TERM...Hatch AVIATION...DSA
Hazardous Weather Outlook National Weather Service Springfield MO 1255 PM CDT Fri Aug 18 2017 KSZ073-097-101-MOZ055>058-066>071-077>083-088>098-101>106-191800- Bourbon-Crawford-Cherokee-Benton-Morgan-Miller-Maries-Vernon- St. Clair-Hickory-Camden-Pulaski-Phelps-Barton-Cedar-Polk-Dallas- Laclede-Texas-Dent-Jasper-Dade-Greene-Webster-Wright-Newton- Lawrence-Christian-Douglas-Howell-Shannon-McDonald-Barry-Stone- Taney-Ozark-Oregon- 1255 PM CDT Fri Aug 18 2017 This Hazardous Weather Outlook is for portions of the Missouri Ozarks and extreme southeast Kansas. .DAY ONE...This Afternoon and Tonight. Weather hazards expected... Limited Hail risk. Limited Thunderstorm wind damage risk. Limited Flooding risk. Elevated Lightning risk. Limited Excessive heat risk. DISCUSSION... Isolated thunderstorms may be possible late this afternoon. A complex of thunderstorms is expected to develop across eastern Kansas late this evening and track east southeast into southern Missouri overnight. There will be a marginal or limited risk for a couple strong to severe thunderstorms possible late this evening and overnight. The main threat will be isolated damaging wind gusts up to 60 mph and large hail up to the size of quarters. Depending upon the track of the system, locally heavy rainfall may be possible where storms move over the same locations. Heat index values will climb into the middle to upper 90s for portions of southeastern Missouri and extreme southwestern Missouri this afternoon. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Periodic scattered showers and thunderstorms will be possible from Sunday through middle of next week. Heat index values will warm into the middle and upper 90s by later this weekend and early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through this evening. && More detailed information can be accessed at: http://www.weather.gov/sgf/sitrep This product in graphical format...along with other weather... hydrological and climate information...at http://www.weather.gov/sgf Hatch
The Pleasant Hill radar (KEAX), 109 km away, was scanning. The volume nearest the first event began at 21:53 UTC.
14 flash flood, 4 thunderstorm wind, 4 hail, 2 flood. Local standard time, as filed.
A section of County Road 300 in western rural Vernon County was flooded.
Water flowed over the roadway on Highway O just east of Highway H.
Water flowed over the roadway at 600 Road and Katy Track Road.
Water flowed over the roadway at 200 Road and Katy Track Road.
A tree was blown over onto State Highway 37.
A picture of ping pong size hail was on social media near Linn Creek.
A large tree fell on a small truck. Numerous trees and power lines were blown down southeast of St. Roberts.
A farm building was heavily damaged on Highway A west of Lowry City.
Excessive rainfall caused a section of Highway RA to become flooded.
A section of Highway 215 west of Bona was flooded.
A section of Highway W near Turkey Creek was flooded. Walnut Grove Fire Department closed this section of highway.
The section of 560 Road near Asher Creek in southern Polk County was flooded.
The low water crossing at Blue Springs Drive along Big Spring Creek was flooded.
The low water crossing at State Highway Z along Big Spring Creek was flooded.
The low water crossing at Rock Hole Road near Saline Creek was flooded.
The low water crossing at Watts Road near Moreau Creek was flooded.
There was damage to utility poles near the city hall in Branson.
MODOT reported Route BB was closed due to flooding at Gabriel Creek southeast of Florence.
MODOT reported Route P was closed due to flooding of Starks Creek.
MODOT reported Route D near Preston closed due to flooding.
Several roads were flooded across St. Clair County. The Collins Fire Department reported several gravel roads were damaged or washed out.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2017Every state in 2017This day in weather historyWarnings in Missouri, August 2017
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: 709066, 709358, 709359, 709360, 709366, 709361, 709362, 709363, 709367, 709364, 709369, 709341, 709344, 709346, 709349, 709350, 709351, 709352, 709353, 709368, 709354, 709356, 709357, 709355.