An approaching warm front triggered showers and thunderstorms across north-central Illinois during the early morning of September 9th. 50 inches occurred along and north of a Galesburg to Bloomington-Normal line.
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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.
An approaching warm front triggered showers and thunderstorms across north-central Illinois during the early morning of September 9th. Locally heavy rainfall amounts of 1.50 to 2.50 inches occurred along and north of a Galesburg to Bloomington-Normal line. In addition, one cell produced gusty winds of around 60 mph and minor wind damage in northern Peoria County near Chillicothe.
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 Sep 9, 2:07 AM CST, 41 minutes earlier.
Area Forecast Discussion NATIONAL WEATHER SERVICE LINCOLN IL 307 AM CDT Tue Sep 9 2014 .SHORT TERM...(Today) ISSUED AT 307 AM CDT TUE SEP 9 2014 Clusters of thunderstorms continue to develop across eastern Iowa and northwestern Illinois early this morning in advance of a weak short-wave trough. Storms are being fed by a 30-35kt 850mb jet as noted by the DMX VWP. Models have been struggling with the convective evolution, with most solutions developing the storms a bit too far west. With the more eastward development and general propagation to the S/SE, have increased PoPs across the western KILX CWA into the likely category this morning. At this point, will keep highest PoPs confined to locations along and west of the Illinois River, with only slight chances as far east as a Champaign to Taylorville line. As nocturnal jet weakens, storms will tend to dissipate later this morning: however, re-development could occur along outflow boundaries later today, so will maintain low chance PoPs through the afternoon. Due to the clouds/precip across the W/NW, have lowered highs into the upper 70s there, with lower to middle 80s further east and south where sunshine will be more prevalent. && .LONG TERM...(Tonight through Monday) ISSUED AT 307 AM CDT TUE SEP 9 2014 1002mb low pressure system will develop over western Kansas today, then will deepen to around 995mb as it tracks into northern Michigan by Wednesday evening. Two distinct rounds of convection appear likely across central and southeast Illinois with this feature...the first arriving across the Illinois River Valley late tonight and the second impacting the entire area Wednesday afternoon and evening. The first round of storms will develop in an increasingly unstable/sheared environment across Kansas/Nebraska ahead of the approaching low this afternoon. These storms will track E/NE across Missouri and Iowa during the evening, then into west-central and northwest Illinois tonight. 850mb jet streak is progged to strengthen to between 55 and 60kt overnight, supporting the potential for damaging wind gusts with the storms. As a result, SPC has placed all locations along/northwest of the Illinois River under a Slight Risk for severe overnight. In addition to the wind threat, precipitable water values climbing to over 2 inches will support high rainfall rates and potential flash flooding. Have increased PoPs to 100 percent along and northwest of a Rushville to Minonk line accordingly and later shifts may need to evaluate the possibility of a Flash Flood Watch across this area if the heavy rain axis does indeed set up as expected. This first round of convection will then continue to lift E/NE across the northern two-thirds of the KILX CWA Wednesday morning. Second round of storms will re-develop along approaching cold front or effective outflow boundary from morning convection by Wednesday afternoon and evening. Strongest low-level jet energy will translate into the Great Lakes by Wednesday afternoon, with highest VGP values shifting into southern Michigan/northern Indiana. While this area may see the most widespread threat for severe weather(including a few tornadoes), enough low-level wind shear will be present further W/SW into central Illinois to support robust convection. The main questions will be how much destabilization will occur in the wake of the morning storms and where will the outflow boundary be located. Models agree that lower 70s dewpoint air will produce CAPE values of 1500-2500J/kg Wednesday afternoon. This coupled with 0-6km shear values of 30-40kt will be enough to support a severe weather threat, including large hail, damaging wind gusts, and isolated tornadoes. Will carry categorical PoPs across the board. Cold front will sink southward Wednesday night, eventually clearing the SE CWA by early Thursday morning. Once front passes, cooler and drier weather will settle into the area on Thursday with high temperatures dropping into the 60s. Trailing 500mb trough axis is still expected to swing through the region on Friday, although 00z Sep 9 models have continued to slow its progress, with consensus now bringing it across Illinois Friday night. Given strong upper dynamics and steep lapse rates, will carry chance PoPs across the west Friday afternoon, then slight chances everywhere Friday night. After that, strong Canadian high pressure will dominate the weather through early next week, leading to much below normal temperatures. Highs this weekend will only reach the 60s, while overnight lows dip into the 40s. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) ISSUED AT 1151 PM CDT MON SEP 8 2014 VFR conditions will continue at all TAF sites next 24hrs. Mid and high clouds have overspread the area and will remain over all sites next 24hrs. A small MCS has developed over eastern Iowa and appears to be slowly moving east with some elements translating southeast. It is possible that some of this could reach the PIA TAF by around 09z, but should diminish after that with only showers reaching the other sites. Because the atmosphere over most of central IL is dry, will keep cigs high and expect the pcpn to decrease as it moves east and southeast overnight and into the morning hours. Will still have VCTS at PIA and only VCSH at the other TAF sites. The VC should only last around 4hrs at PIA and BMI, and 2-3hrs at SPI, DEC, and CMI. Once the pcpn ends during the morning hours, the mid clouds will continue through the remainder of the TAF time. Winds will be south-southeast through the period with speeds around 12kts tomorrow and continuing into the evening hours tomorrow as the gradient tightens ahead of the next weather system. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...BARNES LONG TERM...BARNES AVIATION...AUTEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LINCOLN IL 325 PM CDT MON SEP 8 2014 ILZ027>031-036>038-040>043-047>051-091100- CASS-DE WITT-FULTON-KNOX-LOGAN-MARSHALL-MASON-MCLEAN-MENARD- MORGAN-PEORIA-SANGAMON-SCHUYLER-SCOTT-STARK-TAZEWELL-WOODFORD- 325 PM CDT MON SEP 8 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS CAN BE EXPECTED AFTER MIDNIGHT...ESPECIALLY ALONG AND WEST OF THE ILLINOIS RIVER. THE STORMS ARE NOT EXPECTED TO BE SEVERE...ALTHOUGH A FEW OF THE THUNDERSTORMS MAY CONTAIN BRIEF HEAVY RAIN...SMALL HAIL AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED THUNDERSTORMS WILL BE POSSIBLE DURING THE DAY TUESDAY. THE MAIN THREAT FOR WIDESPREAD THUNDERSTORMS...HOWEVER...WILL BE LATE TUESDAY NIGHT CONTINUING THROUGH WEDNESDAY EVENING. THE GREATEST POTENTIAL FOR SEVERE STORMS WILL BE DURING THE DAY WEDNESDAY WITH THE PRIMARY THREATS BEING DAMAGING WIND GUSTS AND POSSIBLY A TORNADO. RAINFALL TOTALS OF 1 TO 2 INCHES MAY ALSO CAUSE SOME LOCALIZED FLOODING ISSUES DURING THE DAY WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. ILZ044>046-052>057-061>063-066>068-071>073-091100- CHAMPAIGN-CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-DOUGLAS- EDGAR-EFFINGHAM-JASPER-LAWRENCE-MACON-MOULTRIE-PIATT-RICHLAND- SHELBY-VERMILION- 325 PM CDT MON SEP 8 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE TUESDAY...ESPECIALLY DURING THE MORNING HOURS...WEST OF INTERSTATE 57. THE MAIN THREAT FOR WIDESPREAD THUNDERSTORMS WILL BE WEDNESDAY AND WEDNESDAY NIGHT. THE GREATEST POTENTIAL FOR SEVERE STORMS WILL BE DURING THE DAY WEDNESDAY AND INTO WEDNESDAY EVENING WITH THE PRIMARY THREATS BEING DAMAGING WIND GUSTS AND POSSIBLY A TORNADO. RAINFALL TOTALS OF 1 TO 2 INCHES MAY ALSO CAUSE SOME LOCALIZED FLOODING ISSUES WEDNESDAY INTO WEDNESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. MILLER
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
243 AM CDT TUE SEP 9 2014
ILZ027-028-030-090845-
KNOX-MARSHALL-STARK-
243 AM CDT TUE SEP 9 2014
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN KNOX...STARK AND WESTERN
MARSHALL COUNTIES UNTIL 345 AM CDT...
AT 241 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR ALTONA...OR 11 MILES SOUTH OF CAMBRIDGE...
MOVING SOUTHEAST AT 25 MPH.
PENNY SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM. IN ADDITION...TORRENTIAL RAINFALL WILL OCCUR WITH THESE
STORMS AS THEY TRACK ACROSS THE AREA OVER THE NEXT HOUR WITH
RAINFALL RATES OF 1 TO 2 INCHE PER HOUR WITH SOME OF THE MORE
INTENSE STORMS.
LOCATIONS IMPACTED INCLUDE...
ALTONA...
VICTORIA...
LA FAYETTE...
TOULON...
WEST JERSEY...
WYOMING...
CASTLETON...
OTHER LOCATIONS AFFECTED INCLUDE...DUNCAN AND LAWN RIDGE.
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 4107 8946 4097 8952 4097 8998 4092 8999
4103 9039 4116 9030 4116 8988 4117 8987
TIME...MOT...LOC 0742Z 293DEG 23KT 4114 9015
SMITHSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
245 AM CDT TUE SEP 9 2014
ILZ027-028-030-090845-
KNOX-MARSHALL-STARK-
245 AM CDT TUE SEP 9 2014
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN KNOX...STARK AND WESTERN
MARSHALL COUNTIES UNTIL 345 AM CDT...
AT 241 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR ALTONA...OR 11 MILES SOUTH OF CAMBRIDGE...
MOVING SOUTHEAST AT 25 MPH.
PENNY SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM. IN ADDITION...TORRENTIAL RAINFALL WILL OCCUR WITH THESE
STORMS AS THEY TRACK ACROSS THE AREA OVER THE NEXT HOUR WITH
RAINFALL RATES OF 1 TO 2 INCHES PER HOUR WITH SOME OF THE MORE
INTENSE STORMS.
LOCATIONS IMPACTED INCLUDE...
ALTONA...
VICTORIA...
LA FAYETTE...
TOULON...
WEST JERSEY...
WYOMING...
CASTLETON...
OTHER LOCATIONS AFFECTED INCLUDE...DUNCAN AND LAWN RIDGE.
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 4107 8946 4097 8952 4097 8998 4092 8999
4103 9039 4116 9030 4116 8988 4117 8987
TIME...MOT...LOC 0742Z 293DEG 23KT 4114 9015
CORRECTED SPELLINGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
323 AM CDT TUE SEP 09 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0318 AM TSTM WND GST TOULON 41.09N 89.86W
09/09/2014 M43 MPH STARK IL TRAINED SPOTTER
&&
SMITHSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
338 AM CDT TUE SEP 9 2014
ILZ028>031-090930-
MARSHALL-PEORIA-STARK-WOODFORD-
338 AM CDT TUE SEP 9 2014
...SIGNIFICANT WEATHER ADVISORY FOR MARSHALL...NORTHEASTERN PEORIA...
SOUTHEASTERN STARK AND WOODFORD COUNTIES UNTIL 430 AM CDT...
AT 335 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES WEST OF CHILLICOTHE...OR 12 MILES
SOUTHWEST OF LACON...MOVING EAST AT 40 MPH.
PENNY SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THE
STORM. IN ADDITION...TORRENTIAL RAINFALL WILL OCCUR WITH THE CLUSTER
OF STORMS TRACKING ACROSS THE SAME AREA OVER THE NEXT HOUR WITH
RAINFALL RATES OF 1 TO 2 INCHES PER HOUR WITH SOME OF THE MORE
INTENSE STORMS.
LOCATIONS IMPACTED INCLUDE...
CHILLICOTHE...
ROME...
SPARLAND...
LACON...
WASHBURN...
METAMORA...
OTHER LOCATIONS AFFECTED INCLUDE...LAWN RIDGE...HOPEWELL...
CAZENOVIA...LOW POINT...PATTONSBURG AND BENSON.
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 4114 8932 4112 8932 4111 8933 4111 8905
4110 8904 4093 8904 4093 8894 4092 8892
4076 8892 4075 8899 4067 8899 4089 8976
4115 8966
TIME...MOT...LOC 0836Z 288DEG 35KT 4095 8961
SMITHThe Lincoln radar (KILX), 88 km away, was scanning. The volume nearest the first event began at 08:48 UTC.
1 thunderstorm wind. Local standard time, as filed.
Several trees were blown down, including one that damaged a car and part 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: 541112.