Isolated storms developed over southeastern Missouri. One storm produced damaging winds.
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.
Isolated storms developed over southeastern Missouri. One storm produced damaging winds.
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 May 9, 5:02 PM CST, 3 hours 8 minutes earlier.
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 602 PM CDT MON MAY 9 2016 .SHORT TERM... (Through Late Wednesday) Issued at 303 PM CDT Mon May 9 2016 An area of rain with embedded thunderstorms was ongoing this afternoon and has been for most of the day. Pcpn was supported by H85 LLJ moisture convergence. The local WRF model depicts an intensification of the jet after 00z and especially after 03z. The jet will simultaneously translate northeastward as it intensifies, therefore the bulk of the pcpn should also translate northeastward with time. This has been reflected in the overnight PoP grids. There is a possibility that convection farther west may organize into a line and move into the LSX CWA late tonight (after midnight) or early tomorrow morning. H7-H5 lapse rates are forecast to increase overnight, exceeding 6.5-7 deg C/km after 06z. MUCAPE remains around 1000 J/kg overnight with higher values noted across the southern half of the CWA. This environment would be favorable to maintain convection if it moves into the area, although it may not necessarily be severe. An organized line could produce wind gusts, and the steep H7-H5 lapse rates suggest that the stronger convective cores could also produce hail. A lull in widespread pcpn is expected on Tuesday. Although the shear is better on Tue (30-40 kts of 0-6km bulk shear) compared to Wed, the CAPE is less favorable and models depict a capping inversion dvlpg between 800-700mb. There is also shortwave ridging aloft. Can't rule out a few strong to severe storms if anything can break the cap, but widespread pcpn is not expected attm. Attention then turns to Wednesday. Wed looks like a very warm day with the entire CWA in the warm sector and southwesterly surface winds during most of the day. Forecast high temperatures in the mid to upper 80s are around 10-12 degrees above average for this time of year. While local residents are out enjoying the warm weather, a cold front will be approaching from the west. The front will move through the area on Wed aftn/eve. Although shear values are on the low side ahead of the front (perhaps up to 25 kts of 0-6 km bulk shear), the instability forecasts are sobering. Even the SREF paints high probabilities of at least 2000-3000 J/kg of CAPE on Wed aftn. Most models also depict very favorable H7-H5 lapse rates of around 7-7.5 deg C/km. High instability values have been known to compensate for lower shear, the timing of the cold front is diurnally favorable, and shear vectors are nearly parallel to the boundary. Therefore, a line of strong to severe thunderstorms is expected to develop near the front and move across our area on Wed aftn/eve. Pcpn tapers off on Wed night with the passage of the cdfnt. Kanofsky .LONG TERM... (Thursday through Next Monday) Issued at 303 PM CDT Mon May 9 2016 Quiet weather is expected on Thursday. The aforementioned cold front will have been shunted off to the south and high pressure will have settled across the region. A trough develops near the Great Lakes on Friday, placing the LSX CWA beneath NW flow aloft. Its approach also sends another cold front into the region on Friday which then lifts back northward as a warm front on Sun/Mon. During this time, large-scale lift ahead of occasional shortwaves and the presence of a boundary supports a chance of SHRA/TSRA. Kanofsky && .AVIATION... (For the 00z TAFs through 00z Tuesday Evening) Issued at 532 PM CDT Mon May 9 2016 An area of light showers over the taf sites should shift northeast of COU and the St Louis metro area around 00Z Tuesday and northeast of UIN by 02Z Tuesday. There may be a brief period of partial clearing this evening, especially at COU. More convection is expected late tonight into Tuesday morning as an upper level disturbance moves northeastward through the region with a southwesterly low level jet across southeast MO and southwest IL late tonight. An area of showers and storms across parts of southwest and south central MO into northwest AR may clip the St Louis metro area late this evening into the overnight hours. Thunderstorms over eastern parts of KS and OK may move into the taf sites late tonight. For now will just include VCTS in the tafs late tonight due to uncertainties in timing and coverage. With abundant moisture in the low levels should see prevailing cigs dropping into the MVFR catagory late tonight, then rising back into the VFR catagory by Tuesday afternoon. Sely surface winds tonight should become more s-swly on Tuesday. Specifics for KSTL: Should have a break in the precipitation this evening with more showers and storms moving through the STL area late tonight. For now will just include VCTS in the STL taf late tonight. The prevailing cigs should drop into the MVFR catagory late tonight, then rise back into the VFR catagory late Tuesday morning. There may be scattered showers/storms redeveloping late Tuesday afternoon and early evening. Sely surface wind tonight will become s-swly on Tuesday. GKS && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 422 PM CDT MON MAY 9 2016 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-101200- 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- 422 PM CDT MON MAY 9 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THUNDERSTORMS ARE LIKELY TONIGHT. SOME OF THE STORMS MAY BE STRONG TO SEVERE AND CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY PERIODS OF THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA ON TUESDAY AND WEDNESDAY. SEVERE STORMS ARE POSSIBLE THROUGHOUT THIS PERIOD. THE GREATEST THREAT FOR SEVERE THUNDERSTORMS WILL BE ON WEDNESDAY AFTERNOON AND WEDNESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE LATE TONIGHT. KANOFSKY
The St Louis radar (KLSX), 157 km away, was scanning. The volume nearest the first event began at 02:12 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew down a couple of trees onto Highway 143 just east of intersection with Highway 49.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2016Every state in 2016This day in weather historyWarnings in Missouri, May 2016
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: 647252.