Slow moving thunderstorms developed over portions of east central and southwestern Illinois. Very heavy rain caused 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.
Slow moving thunderstorms developed over portions of east central and southwestern Illinois. Very heavy rain caused 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 Jun 15, 2:26 PM CST, 2 hours 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 326 PM CDT Mon Jun 15 2015 .SHORT TERM: (Through Late Tonight) Issued at 300 PM CDT Mon Jun 15 2015 Diurnal heating of the very moist airmass has produced SBCAPE of 2000-3000 J/KG, with weak forcing resulting in scattered and broken bands of showers and thunderstorms. This activity is occurring in a broad region south of a cold front currently stretching from WI through SE IA through NW MO, and generally within modest southwest flow aloft along the periphery of the upper high centered in the southeastern U.S.. The general model consensus is the front will move slowly southeastward tonight and extend from the northern OH Valley to just north of St. Louis through SE KS at 12z Tues. The last few days there has been a strong diurnal compenent to the coverage and intensity of the shower/thunderstorm activity. While I expect this will remain the case again tonight with the best activity and coverage through mid-evening, the presence of the encroaching cold front and broad low level convergence associated with the anticyclonically curved w-swly LLJ should support potential for at least pockets or clusters of showers and thundrstorms from the late evening into the overnight hours. Given the high moisture content...heavy downpours will remain an ongoing threat along with an isolated threat of downburst winds with any organized storms into the early evening. Glass .LONG TERM: (Tuesday through Next Monday) Issued at 300 PM CDT Mon Jun 15 2015 A better threat of more widespread heavy rainfall will evolve gradually Tuesday afternoon, but primarily Tuesday night into Wednesday and Thursday. The general scenario has not changed much. The aforementioned southwest-northeast front will become quasi-stationary near the I-70 corridor and then waver into Tuesday evening. During this time frame a series of disturbances aloft will continue to track ENE along the periphery of the upper ridge across the area while broad confluent flow persists in the low-levels supporting showers and thunderstorms, most numerous along and south of the front. High moisture content will support heavy downpours while pockets of stronger diurnal heating and the associated instability will support an isolated severe threat for damaging winds. In is not out of the question that a flash flood watch may be needed as early as Tuesday afternoon, but the greatest risk appears to be Tuesday night-Thursday. The current guidance suggests there are likely to be 2 main rounds of heavy rain. The first will be late Tuesday night into early Wedensday afternoon. Although the front is forecast to retreat back northward on Tuesday night, a continued series of even more vigorous disturbances aloft tracking east-northeast across the area late Tuesday night into Wednesday along with a well focused and broadly convergent southwestly LLJ is pointing strongly to persistent showers and thunderstorms centered along the I-44 corridor. Moisture content is already anomously high with PW's in excess of 1.9 inches and the persistence of precipitation along with high efficiency is likely to yield some high rainfall rates and rainfall totals. At this time the final round should be tied to the remnant low associated with what will likely soon become TS Bill. The vast array of available global and hurricane models have the consenus track moving NW in the weakness in the upper ridge into southeast TX then turning north and eventually northeast along the periphery of the upper ridge, with a track from far SW MO through SE MO and SRN IL in the 72-96h time frame with the greatest impacts across the southeast third of the CWA on Thursday. A swath of 5-7 inches of rainfall and locally higher over the next 5 days from southwest MO through the St. Louis area into the OH Valley as projected by NCEP/WPC certainly looks quite possible. Will issue an updated Flood Potential Outlook/ESF to highlight the above scenario and expect that Flash Flood Watches will be hoisted within the next 24 hours. Glass && .AVIATION: (For the 18z TAFs through 18z Tuesday Afternoon) Issued at 1114 AM CDT Mon Jun 15 2015 Diurnal cumulus clouds will continue to develop this afternoon with a cloud ceiling around 3000-4000 feet. Isolated showers/storms have developed between COU and UIN and between UIN and STL late this morning. As the atmosphere continues to destabilize with daytime heating more showers and storms will develop this afternoon into the early evening hours, plus the area of showers/storms over southwest MO will move northeastward into our area this afternoon. A cold front extending from WI southwest through eastern KS will move southeastward into our area tonight. The front will move through UIN and stall out from near COU to STL on Tuesday. This front will be the focus for more showers and a few storms tonight. MVFR cloud heights are also possible along and behind this front tonight and Tuesday morning. The swly surface winds will become n-nely in UIN later this evening after fropa. Specifics for KSTL: Showers and storms will continue to develop this afternoon and become more numerous impacting STL through at least the early evening hours. More showers and a few storms may develop along and just ahead of a cold front later tonight which will drop southeastward towards STL. The front will stall out near STL on Tuesday with more storms Tuesday afternoon. GKS && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 342 PM CDT MON JUN 15 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-161200- 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- 342 PM CDT MON JUN 15 2015 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. ISOLATED STRONG TO SEVERE STORMS WILL BE POSSIBLE THROUGH EARLY THIS EVENING...WITH THE PRIMARY THREAT BEING STRONG GUSTY WINDS. LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THUNDERSTORMS ARE LIKELY EACH DAY FROM TUESDAY THROUGH THURSDAY WITH POTENTIAL FOR HEAVY RAINFALL THROUGH THIS ENTIRE PERIOD. ISOLATED STRONG-SEVERE STORMS WILL BE POSSIBLE ON TUESDAY AFTERNOON AND EARLY EVENING AND AGAIN ON WEDNESDAY AFTERNOON AND EARLY EVENING...WITH THE PRIMARY THREAT BEING STRONG GUSTY WINDS. A LOWER CHANCE FOR THUNDERSTORMS WILL THEN CONTINUE FROM FRIDAY THROUGH SUNDAY. MODERATE FLOODING IS EXPECTED ON SOME POINTS ON THE MISSOURI RIVER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. GLASS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
510 PM CDT MON JUN 15 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0508 PM TSTM WND GST BERDAN 39.36N 90.40W
06/15/2015 E40 MPH GREENE IL TRAINED SPOTTER
&&
GOSSELINThe Lincoln radar (KILX), 104 km away, was scanning. The volume nearest the first event began at 23:18 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Thunderstorm winds blew down numerous large tree limbs on the north side of Irving.
Up to 5 inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded including U.S. Highway 24 at the Paloma viaduct and Illinois Route 94 south of Golden. Some of the secondary roads were washed out. A couple of cars were stuck in the flooded viaducts, but no injuries were reported.
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: 594521, 594522.