A weak upper-level disturbance triggered isolated thunderstorms across north-central Illinois during the early morning hours of September 1st. A few of the cells produced gusty winds of 50 to 60 mph that caused minor wind damage in northern Peoria County.
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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 ILX wrote it up.
A weak upper-level disturbance triggered isolated thunderstorms across north-central Illinois during the early morning hours of September 1st. A few of the cells produced gusty winds of 50 to 60 mph that caused minor wind damage in northern Peoria County.
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 Lincoln, IL wrote its last area forecast discussion before the first event at Aug 31, 10:52 PM CST, 3 hours 38 minutes earlier.
Area Forecast Discussion NATIONAL WEATHER SERVICE LINCOLN IL 1152 PM CDT Sun Aug 31 2014 .UPDATE... ISSUED AT 858 PM CDT SUN AUG 31 2014 Aside from a few spotty showers in east central Illinois, quiet conditions prevail across the forecast area this evening, and should for most if not all of the night. The main thing that may disrupt the quiet weather before morning, and it looks rather impressive at the moment, is the storm complex approaching from the Plains & upper Midwest. This complex is being driven by a seasonably strong upper level jet/wave, and 45-50 kt low level jet. Expect this complex, although it should be on the downswing in intensity, to begin to impact areas west of the Illinois River after 4 AM. Going forecast has overnight scenario well covered. Only minor tweaks have been needed to the hourly trends. && .SHORT TERM...(This evening through Monday) ISSUED AT 242 PM CDT SUN AUG 31 2014 Vigorous short-wave evident on 18z/1pm water vapor imagery over Colorado will be the primary weather-maker across central Illinois over the next 24 hours. As this feature pushes eastward, showers and thunderstorms will become more numerous across western Iowa/Nebraska this afternoon. A complex of strong to severe thunderstorms will eventually get organized, then begin pushing eastward across Iowa overnight. Most model guidance keeps this convection west of Illinois until around 12z. Have therefore gone with a mostly dry forecast for tonight, with chance PoPs arriving across the Illinois River Valley well after midnight. Overnight thunderstorm complex will likely spill into west-central Illinois Monday morning as it undergoes diurnal weakening. While gusty winds and brief heavy downpours may be possible with the storms, the severe weather threat will remain low during the morning hours. Have gone with likely PoPs along/west of I-55 through midday, with just chance PoPs further east and south. Main question on Monday will be when/where thunderstorms will re-develop during the afternoon. Colorado short-wave and accompanying cold front will approach from the west late in the day, while outflow boundary from morning convection will be around as well. With plenty of boundaries to develop on and strong upper support arriving, think showers and thunderstorms will become likely across the northern two-thirds of the CWA during the mid to late afternoon hours. Forecast soundings indicate the atmosphere will have enough time to destabilize after the morning clouds/showers, with CAPE values reaching the 2000 to 3000J/kg range. More impressive is the projected 0-6 km bulk shear values, which climb into the 30 to 50kt range. If airmass can destabilize as expected, strong to severe thunderstorms will be a good bet Monday afternoon/evening. Any storms that develop will be capable of producing large hail and damaging wind gusts. Have added severe/heavy rain mention to the forecast accordingly. && .LONG TERM...(Monday night through Sunday) ISSUED AT 242 PM CDT SUN AUG 31 2014 A line of strong to severe storms is expected to in progress at the start of Monday night, as a cold front pushes southeast across Illinois. Forecast soundings indicate around 2000 J/kg MLCAPE and 0-6km shear of 40kt will continue into the evening. Those params coupled with abundant moisture in the 1.7" to 2" PWATs will be enough to fuel some rotating storms with hail and damaging winds. Flash flooding will be a concern as well, especially as Monday night progresses. The 300mb jet is expected to increase over the western Great Lakes, putting central IL under the right entrance divergent region. The line of storms is expected to become oriented parallel to the steering flow later at night, allowing for more training echoes, back-building, and very high rainfall amounts. The higher threat for flooding will be mainly southeast of I-72 Monday night, and heavy rain was added to the forecast during that time frame. Storm chances will continue into Tuesday for our southeast counties due to the slower progress of the front, along with heavy rain threat. Zonal flow will bring a few shortwave toward Illinois on Wednesday, but any storms associated with them appear to lose support as they depart farther from the thermal and theta-e ridges in the Plains. We kept chance PoPs west of Springfield for Wed, with slights east to I-57. Variable coverages of slight chance PoPs were left in the extended through Thursday due to periodic waves of energy that could trigger isolated showers/storms. Storm chances increase in the north Thursday night as the next cold front and upper trough approach IL. Widespread chance PoPs were left in the forecast for Friday into Saturday as the cold front slowly progresses southeast across the area. Humidity will remain high from Tuesday through Friday, as afternoon dewpoints climb from the upper 60s Tuesday to the low to mid 70s on Thursday and Friday. High temps will be in the low to mid 80s on Tue-Wed, but will warm into the upper 80s and low 90s Thur and Friday ahead of the cold front Friday night. Much cooler temps and dewpoints are forecast for Saturday and Sunday next weekend, with highs on Sunday in the 70s and lows in the mid to upper 50s. && .AVIATION...(For the 06Z TAFS through 06Z Monday night) ISSUED AT 1151 PM CDT SUN AUG 31 2014 Convective complex making steady progress toward central Illinois from the west, although it has been weakening with time as expected. Cigs will develop/thicken/lower across the terminals overnight as the complex draws closer/pushes in, but predominantly VFR conditions are likely aside from any heavier precipitation. Still some uncertainty when/if the storm complex will dry up completely, so have only included a TEMPO at KPIA overnight. Shower/storm redevelopment is likely across central Illinois by Monday afternoon, focusing along an outflow boundary from tonight's storms and/or an approaching cold front. This precipitation is apt to be more widespread, so have included predominant showers with VCTS beginning in the afternoon and continuing into the evening hours Monday. At this point, only have VSBYs falling to MVFR levels in the steadier rainfall, but the CIGs certainly may as well. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE...BAK SHORT TERM...BARNES LONG TERM...SHIMON AVIATION...BAK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 308 PM CDT SUN AUG 31 2014 ILZ027>031-036-037-040-041-047>050-011100- CASS-FULTON-KNOX-MARSHALL-MASON-MENARD-MORGAN-PEORIA-SCHUYLER- SCOTT-STARK-TAZEWELL-WOODFORD- 308 PM CDT SUN AUG 31 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...TONIGHT A LINE OF THUNDERSTORMS WILL APPROACH THE ILLINOIS RIVER VALLEY TOWARD DAWN MONDAY. SEVERE WEATHER IS NOT EXPECTED...HOWEVER GUSTY WINDS AND FREQUENT LIGHTNING WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS WILL RE-DEVELOP ACROSS THE AREA MONDAY AFTERNOON AND EVENING. SOME OF THE STORMS COULD BECOME SEVERE...WITH THE PRIMARY HAZARDS BEING LARGE HAIL AND DAMAGING WIND GUSTS. ANOTHER WEATHER SYSTEM WILL BRING THUNDERSTORM CHANCES BACK INTO THE PICTURE THURSDAY NIGHT THROUGH FRIDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ038-042>046-051>057-061-011100- CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-LOGAN-MACON- MCLEAN-MOULTRIE-PIATT-SANGAMON-SHELBY-VERMILION- 308 PM CDT SUN AUG 31 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS AND EAST CENTRAL ILLINOIS. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT ON MONDAY. SOME OF THE STORMS COULD BECOME SEVERE MONDAY AFTERNOON AND EVENING...WITH THE PRIMARY HAZARDS BEING LARGE HAIL AND DAMAGING WIND GUSTS. WHILE THE SEVERE WEATHER THREAT WILL GRADUALLY DIMINISH AFTER SUNSET...HEAVY RAINFALL MAY BECOME AN ISSUE MONDAY NIGHT AS STORMS BECOME PARALLEL WITH THE UPPER FLOW. THE GREATEST CHANCE FOR HEAVY RAINFALL APPEARS TO BE SETTING UP ALONG AND SOUTH OF A SPRINGFIELD TO DANVILLE LINE. ANOTHER WEATHER SYSTEM WILL BRING THUNDERSTORM CHANCES BACK INTO THE PICTURE FRIDAY INTO SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ062-063-066>068-071>073-011100- CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND- 308 PM CDT SUN AUG 31 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS WILL DEVELOP AHEAD OF A COLD FRONT ON MONDAY. SOME OF THE STORMS COULD BECOME SEVERE MONDAY AFTERNOON AND EVENING...WITH THE PRIMARY HAZARDS BEING LARGE HAIL AND DAMAGING WIND GUSTS. WHILE THE SEVERE WEATHER THREAT WILL GRADUALLY DIMINISH AFTER SUNSET...HEAVY RAINFALL MAY BECOME AN ISSUE MONDAY NIGHT AS STORMS BECOME PARALLEL WITH THE UPPER FLOW. A FEW THUNDERSTORMS MAY LINGER INTO TUESDAY...HOWEVER SEVERE WEATHER IS NOT EXPECTED. ANOTHER WEATHER SYSTEM WILL BRING THUNDERSTORM CHANCES BACK INTO THE PICTURE FRIDAY INTO SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. BARNES
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
302 AM CDT MON SEP 1 2014
ILZ027-028-010830-
KNOX-STARK-
302 AM CDT MON SEP 1 2014
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN KNOX AND NORTHERN STARK
COUNTIES UNTIL 330 AM CDT...
AT 259 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GALESBURG...MOVING NORTHEAST AT 40 MPH.
SMALL HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
ONEIDA...
VICTORIA...
ALTONA...
LA FAYETTE...
TOULON...
ELMIRA...
OTHER LOCATIONS AFFECTED INCLUDE...EAST GALESBURG...HENDERSON AND
SNAKE DEN HOLLOW.
PEOPLE NEAR THESE LOCATIONS SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS...AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.
LAT...LON 4124 8964 4123 8963 4118 8963 4084 9036
4095 9045 4101 9045 4116 9021 4116 8988
4123 8987 4124 8986
TIME...MOT...LOC 0801Z 235DEG 37KT 4098 9031
ONTONThe Lincoln radar (KILX), 91 km away, was scanning. The volume nearest the first event began at 08:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
A few trees were uprooted and numerous tree branches were blown down. The roof of a barn was lifted up on the back wall and flashing/gutter damage occurred to the roof of a house.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2014Every state in 2014This day in weather historyWarnings in Illinois, September 2014
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: 540535.