Isolated storms developed across the region. Some of the storms 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 across the region. Some of the storms 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 Jun 12, 2:40 PM CST, 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 340 PM CDT Fri Jun 12 2015 .SHORT TERM: (Through Late Tonight) Issued at 124 PM CDT Fri Jun 12 2015 Scattered showers and thunderstorms have developed across southeast MO and southwest IL where the atmosphere has become very unstable along and south of a weak cold front which extends from a surface low near PIA southwest through PPQ and COU. This activity will continue to develop late this afternoon into the early evening, then dissipate later this evening as the atmosphere begins to stabilize with the loss of daytime heating as shown by our local high resolution WRF model. Some of these storms will produce a brief period of heavy rainfall. There may be some nocturnal convection moving eastward into the western portion of our forecast area late tonight/early Saturday morning ahead of the upper level trough over the central Plains and on the nose of a s-swly low level jet focusing into sortheast KS and southwest MO. GKS .LONG TERM: (Saturday through Next Friday) Issued at 339 PM CDT Fri Jun 12 2015 The weak front will lift back northward as a warm front with at least scattered afternoon and early evening showers/storms expected again on Saturday and Sunday with weak southwest flow shortwaves moving northeastward through the area on the backside of the southeast US upper level ridge. A cold front will sag southward into our forecast area Monday afternoon and night. The GFS is more progressive with this front dropping it into southern portions of MO and IL, while the ECMWF model only drops it as far south as northern MO and central IL. This front should be the focus for more convection with abundant moisture due to deep southerly flow from the Gulf. Will go with relatively high pops across the entire area for Monday and Tuesday as shortwaves move eastward through our area initiating convection along this front. May have concerns for heavy rainfall and possible flooding for at least the early portion of the next work week due to this persistent active weather pattern. GKS && .AVIATION: (For the 18z TAFs through 18z Saturday Afternoon) Issued at 1053 AM CDT Fri Jun 12 2015 Surface front lies from a low pressure area just north of UIN to another low just south of ICT. Short wave over north ecntral Kansas appears to be lifting more north and weakening. Thus I am not optimistic in terms of the front progressing very far south. A westerly wind may develop at Uin and COU for a while, but that will go back to south by 12z Satuday. MOdels are all over the place with pricipitation with the GFS being too widespread this morning and the NAM putting a 1 inch plus bulls eye between UIN and STL tonight. With the short wave pulling out will go with a more scattered scenario for 24 hours with more widespread activity further west with the next short wave moving in. Specifics for KSTL: Surface front may get a bit closer to STL today so a more westerly component to the wind will likely be needed for a while. Front will quickly retreat back north overnight with a return to a south wind. Weak front should be focus for scattered thunder this aftenoon into the evening. No way to pin down exact time and location so will go with VCTS and amend as needed. Overall forecast will stay VFR as the NAM looks overdone in terms of stratus for Saturday am. JPK && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 357 PM CDT FRI JUN 12 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-131115- 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-ST. 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-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO- WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO- MADISON MO-REYNOLDS MO- 357 PM CDT FRI JUN 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH ANY OF THE STORMS. A FEW OF THE STRONGER STORMS MAY PRODUCE STRONG GUSTY WINDS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE FOR THUNDERSTORMS ACROSS MOST OF THE AREA EACH DAY...ESPECIALLY FROM SUNDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. GKS
The St Louis radar (KLSX), 62 km away, was scanning. The volume nearest the first event began at 21:09 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew down several large tree limbs around town. Some of the fallen limbs pulled down power lines as well.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2015Every state in 2015This day in weather historyWarnings in Illinois, June 2015
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: 589919.