Isolated severe storms developed across the region. A few reports of damaging winds and small hail were reported.
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 severe storms developed across the region. A few reports of damaging winds and small hail were reported.
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 Sep 10, 5:54 PM CST, 1 hour 29 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 654 PM CDT THU SEP 10 2015 .UPDATE: Issued at 623 PM CDT Thu Sep 10 2015 Have increased PoPs across ern portions of the CWA where TSRA continue to drop swd into the region. Outflow boundaries will continue to make wwd extent of precip challenging, but believe bulk of precip will remain E of the Mississippi River. Storms shud weaken with sunset. Minimal svr threat continues. Remainder of forecast for tonight currently appears to be on track. && .SHORT TERM: (Through Late Tonight) Issued at 338 PM CDT Thu Sep 10 2015 Spotty convection will continue across most of the FA early this evening due to numerous outflow/surface boundaries migrating through mostly unstable airmass of MLCAPES 1000-2000 j/kg. However, still believe the primary "show" will be late this evening and overnight as primary shortwave energy digs into the region and begins to interact with southward sagging cold front/baroclinic zone. Last several runs of the HRRR continue to support idea that convection over NE will drop/develop across e KS and w MO during the early evening hours as UVV increases due to shortwave as well as increasing isentropic ascent, with the resultant elevated shower and embedded thunderstorm threat overspreading much of the CWA during the overnight hours. Have highest PoPs (~80%) over mid MO where lift and moisture advection should be maximized...this is a bit higher/bit further north than earlier forecast, but models are still indicating good divergence developing across northern MO in the RRQ of the back building upper level jet. PoPs then taper off to high chance over far northern and southern sections of the FA as precip should tend to "fade" a bit as it advects out of the primary zone of ascent. Truett .LONG TERM: (Friday through Next Thursday) Issued at 338 PM CDT Thu Sep 10 2015 Even though frontal boundary will be south of forecast area by 12z Friday, will see some lingering post frontal precipitation gradually tapering off from north to south, including some isolated thunderstorms. Otherwise, colder air to filter into the region and with plenty of cloud cover and rain, temperatures will only rise into the upper 60s to mid 70s. Dry and colder weather to prevail through the weekend. Could see a stray shower on Saturday as decent shortwave energy rotates around upper level trof that is anchored over the Great Lakes. For now have dry conditions, but will need to keep an eye on the models as we get closer to this time period. By Sunday night surface ridge will begin to move off to the southeast. This will allow southerly winds to return once again and temperatures moderate back into the 80s by Tuesday. Extended models hinting at another cold front moving through region beginning Wednesday night. Have low chance pops Wednesday night and Thursday. Byrd && .AVIATION: (For the 00z TAFs through 00z Friday Evening) Issued at 654 PM CDT Thu Sep 10 2015 An outside chance of TSRA affecting STL metro sites thru 02z from outflow kicking out of central IL and moving SW and will watch closely. Otherwise, VFR and dry until rain with some imbedded TSRA develops, fills in, and expands eastward overnight, reaching UIN and COU by midnight and STL metro sites by 08-09z. Some lower VSBYs possible but for the most part looks like a solid area of stratiform light, possibly briefly moderate, rain for several hours once it moves in. Due to cold front also moving thru near the initial onset and much of the rain on the cool side of the front, should also see low sub-VFR clouds form as well and current suite of TAFs appear to have this well in hand. Rain and low clouds to move out later Friday morning or midday, leaving behind VFR conditions and gusty N-NW winds in its wake. Specifics for KSTL: previous TAF looked to have trends well in hand and made few adjustments, notably expanding VCTS timing to deeper into the night and adding gusty NW winds. Otherwise highlights center around cold FROPA within a couple hours of initial rain onset late tonight with deteriorating conditions that carry well into Friday morning. For now left the IFR out but there is an outside chance for that. Watching closely the slowly approaching TSRA from the north that may warrant an amendment as they develop along an old outflow from central IL. TES && .LSX WATCHES/WARNINGS/ADVISORIES: MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 338 PM CDT THU SEP 10 2015 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-111200- 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- 338 PM CDT THU SEP 10 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 POSSIBLE THROUGH TONIGHT. A FEW OF THE THUNDERSTORMS COULD BECOME SEVERE...CAPABLE OF PRODUCING DAMAGING WINDS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS ARE POSSIBLE ON FRIDAY AND AGAIN ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THROUGH TONIGHT. BYRD
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
543 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0255 PM TSTM WND DMG 3 W PEVELY 38.29N 90.45W
09/10/2015 JEFFERSON MO BROADCAST MEDIA
A COUPLE OF DOWNED TREES ON FRONT STREET NEAR HIGHWAY
Z. ONE TREE WAS 2.5 FEET IN DIAMETER AND FELL ONTU POWER
LINES. TIME ESTIMATED FROM RADAR.
&&
GOSSELINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
704 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0704 PM HAIL LITCHFIELD 39.18N 89.66W
09/10/2015 E0.70 INCH MONTGOMERY IL TRAINED SPOTTER
&&
GOSSELINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
705 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0704 PM TSTM WND GST 2 E MEDORA 39.18N 90.10W
09/10/2015 E40 MPH MACOUPIN IL TRAINED SPOTTER
&&
GOSSELINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
709 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HAIL 2 N MEDORA 39.20N 90.14W
09/10/2015 E0.70 INCH MACOUPIN IL TRAINED SPOTTER
&&
TESPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
738 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM TSTM WND GST 1 SW LITCHFIELD 39.16N 89.67W
09/10/2015 M41 MPH MONTGOMERY IL AWOS
&&
GOSSELINPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
754 PM CDT THU SEP 10 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0754 PM HAIL GREENVILLE 38.89N 89.40W
09/10/2015 E0.50 INCH BOND IL TRAINED SPOTTER
&&
GOSSELINThe St Louis radar (KLSX), 106 km away, was scanning. The volume nearest the first event began at 01:23 UTC.
2 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds uprooted several large trees as well as numerous tree limbs between Bartelso and Kaskaskia River.
Thunderstorm winds blew down numerous large tree limbs and bent a flag pole at a 45 degree angle.
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, September 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: 603971, 603972.