Several bands of thunderstorms developed along and ahead of an outflow boundary during the afternoon of June 26th. One storm spawned a brief tornado that damaged a corn field near Cornland in southern Logan 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.
Several bands of thunderstorms developed along and ahead of an outflow boundary during the afternoon of June 26th. One storm spawned a brief tornado that damaged a corn field near Cornland in southern Logan County. Another cell produced a downburst with estimated 70-80 mph winds that downed numerous trees and power poles on the north side of Springfield near Capital Airport. Other storms produced wind gusts of around 60 mph which resulted in scattered damage across the area.
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 Jun 26, 11:50 AM CST, 2 hours 25 minutes earlier.
Area Forecast Discussion National Weather Service Lincoln IL 1250 PM CDT Sat Jun 26 2021 .SYNOPSIS... Issued at 400 AM CDT Sat Jun 26 2021 Several rounds of showers and thunderstorms, some of which could be strong to severe, will bring moderate to heavy rainfall to parts of central IL through this weekend. Additional rainfall amounts of 1 to 3 inches may result in flash flooding especially in low-lying or flood prone areas. A Flash Flood Watch remains in effect for locations north of I-70 through 7 AM Sunday morning. Very humid conditions will continue this weekend, with highs ranging from the lower 80s northwest of the IL river, to the upper 80s to around 90 degrees in southeast IL. && .UPDATE... Issued at 1132 AM CDT Sat Jun 26 2021 Surface analysis late this morning depicts a 1006 mb low located over Iowa with a warm front spread from there into southern Wisconsin and a cold front stretched southwestward into the central Plains. Southerly winds across the local area continue to pull in a plethora of moisture with the 26.12Z ILX sounding plotting a PWAT of 1.90 inches. Scattered showers have started developing within an uncapped environment along/north of I-72 where a steady flow of 850 mb moisture transport is present as well as surface moisture convergence. Activity is expected to increase in coverage going into this afternoon, with the threat for more heavy rainfall and strong to severe storms. Although heavy rainfall and flooding will be the biggest concern for today, any stronger storms that develop will pose a threat for damaging winds. A threat for tornadoes also exist with good turning in the low-levels and 0-1km shear of 20-25 kts. The updated Day 1 outlook at 16Z now has the slight risk stretched across the entire CWA. && .SHORT TERM...(Today and tonight) ISSUED AT 430 AM CDT Sat Jun 26 2021 Continued the flash flood watch over central IL north of I-70 through 7 am Sunday. Between 1 and 3 inches of additional rainfall expected with locally higher amounts from I-72 north. A large MCS on nose of sw 45 kt 850 mb jet produced widespread showers/thunderstorms over central IL during Friday evening with some severe storms along with flash flooding. Between 4-6 inches of rain fell over parts of central and southern McLean county from Bloomington southward. This convection weakened early overnight though still have smaller waves of showers/thunderstorms along and west of I-55 tracking ne. Outflow boundary of earlier MCS was near a Paris to Charleston/Mattoon to Vandalia line, with areas se of this area staying dry past 24 hours. Early morning surface map shows 1006 mb low pressure over sw IA with its warm front over far southern WI. Its cold front extends through central KS and nw Texas. Tropical air mass was firmly in place over central/se IL with dewpoints of 68-75. Precipitable water values remained quite high ranging from 1.8-2.2 inches over central IL, and around 1.7 inches in southeast IL se of I-70. ILX's early Fri evening 00Z sounding had PW of 2.15 inches. Latest CAMs show best chances of showers/thunderstorms today along and nw of a Danville to Taylorville line. The old outflow boundary from Paris to MTO to Vandalia could develop scattered thunderstorms during mid/late afternoon. Tropical air mass gets more unstable during this afternoon with daytime heating and highest CAPES are between the IL river and nw of I-70. Better synoptic lift with low level jet is shifting ne of central IL today into ne IL, nw IN and southern lower MI where SPC has slight risk of severe storms this afternoon/evening. Marginal risk of severe storms continues over central IL from I-70 nw 5% to less than 10% risk of damaging winds and large hail. There is also a 2% to less than 5% risk of tornadoes over northern CWA from mid afternoon to early evening. WPC has slight chance of excessive rainfall over central and ne IL today and tonight due to higher pcpn water values lingering. Highs today range from the lower 80s nw of the IL river to the upper 80s to near 90 in southeast IL where afternoon heat indices reach the upper 90s. 1005 mb low pressure lifts ne into sw WI by midnight tonight and over northern Lake MI by dawn Sunday while pushing a frontal boundary se toward far nw IL. A 40-50 kt sw 850 mb jet over central IL tonight likely brings more waves of showers and thunderstorms to area in tropical air mass along with heavy rain threat. Muggy lows overnight mostly in the lower 70s again. .LONG TERM...(Sunday through Friday) ISSUED AT 445 AM CDT Sat Jun 26 2021 Forecast models have shifted the higher chances of showers and thunderstorms a bit further se on Sunday with southeast IL having a chance of thunderstorms too Sunday afternoon/evening. Best CAPES Sunday afternoon set up from I-72 south though wind shear is weak in southeast IL so that will be a limiting factor in organized severe storms in southeast IL. SPC day2 outlook has marginal risk of severe storms Sunday afternoon/evening southeast of the IL river and to just se of I-70. WPC has slight chance of excessive rainfall Sunday/Sunday night over central IL too. Highs Sunday should be similar to todays highs with heat indices Sunday afternoon reaching upper 90s in southeast IL. The upper level trough over the upper Midwest this weekend, will weaken early next work week, as strong subtropical upper level ridge builds westward from the mid Atlantic States into the mid MS river valley. This will keep the tropical air mass over IL through the middle of next week, along with an active frontal zone extending from Texas/OK ne across MO/IL and into the southern Great Lakes. Daily chances of showers and thunderstorms to continue and locally heavy rain threat to continue with pcpn water values around 2 inches or higher at times. WPC has marginal chance of excessive rainfall over central IL Mon and Mon night. SPC day3 does not have a risk of severe storms over CWA, but could see a few pulse type strong thunderstorms as unstable air mass remains se of the IL river though wind shear continues to weaken se of the IL river. Highs Sunday through Wed to range from the lower 80s nw of the IL river to the upper 80s to around 90 in southeast IL where more sunshine expected closer to the upper level ridge. Extended forecast models deepen upper level trof and develop a cutoff upper level low near IL late next week, though differences with placement of these features. The deeper tropical moisture to start to get shunted se of central IL by Friday though chances of showers and thunderstorms to linger into late next week with cooler temperatures Thu-Sat with highs in the upper 70s/lower 80s. Still humid Thu with dewpoints in the upper 60s/lower 70s and dropping into the low to mid 60s late next week. && .AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1250 PM CDT Sat Jun 26 2021 Scattered showers and isolated storms have developed mostly southeast of the IL River in central IL early this afternoon. Activity is expected to increase in coverage through mid afternoon with strong to severe storms possible. Gusty south-southwest winds persist through the remainder of today, lessening during the overnight hours. MVFR ceilings spread in late tonight and look to linger through the morning hours of Sunday. && .ILX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch through Sunday morning for ILZ027>031-036>038- 040>057-061. && UPDATE...NMB SYNOPSIS...07 SHORT TERM...07 LONG TERM...07 AVIATION...NMB
Hazardous Weather Outlook National Weather Service Lincoln IL 1132 AM CDT Sat Jun 26 2021 ILZ027>031-036>038-040>057-061-271100- Cass-Champaign-Christian-Coles-De Witt-Douglas-Edgar-Fulton-Knox- Logan-Macon-Marshall-Mason-McLean-Menard-Morgan-Moultrie-Peoria- Piatt-Sangamon-Schuyler-Scott-Shelby-Stark-Tazewell-Vermilion- Woodford- 1132 AM CDT Sat Jun 26 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY MORNING... This Hazardous Weather Outlook is for portions of central Illinois, east central Illinois and west central Illinois. .DAY ONE...THIS AFTERNOON AND TONIGHT... Strong to severe storms are possible this afternoon and evening. Damaging wind gusts, hail, and flash flooding are the primary threats, though a few tornadoes are also possible. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... Another round of strong to severe thunderstorms is possible Sunday afternoon and evening. Damaging wind gusts and flash flooding are the main threats. There will be daily chances for thunderstorms through the upcoming week. At this time, the threat for severe storms is uncertain. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. ILZ062-063-066>068-071>073-271100- Clark-Clay-Crawford-Cumberland-Effingham-Jasper-Lawrence-Richland- 1132 AM CDT Sat Jun 26 2021 This Hazardous Weather Outlook is for portions of east central Illinois and southeast Illinois. .DAY ONE...THIS AFTERNOON AND TONIGHT... There is a chance for thunderstorms this afternoon through tonight. Locally heavy rainfall is possible. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... Another round of thunderstorms is possible Sunday afternoon into Sunday night. The severe threat appears low south of I-70 at this time, but locally heavy rain is possible. There will be daily chances for thunderstorms through the upcoming week. At this time, the threat for severe storms is uncertain. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. Auten
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
922 AM CDT SAT JUN 26 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 AM HEAVY RAIN HEYWORTH 40.32N 88.98W
06/26/2021 M6.35 INCH MCLEAN IL BROADCAST MEDIA
24-HOUR TOTAL.
&&
37PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
959 AM CDT SAT JUN 26 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN 3 NNW DOWNS 40.43N 88.89W
06/26/2021 M6.94 INCH MCLEAN IL COCORAHS
COCORAHS STATION IL-MCL-62 2 NW DOWNS.
0600 AM HEAVY RAIN 1 E HEYWORTH 40.31N 88.97W
06/26/2021 M6.35 INCH MCLEAN IL COCORAHS
COCORAHS STATION IL-MCL-31 HEYWORTH 0.6 E.
&&The Lincoln radar (KILX), 45 km away, was scanning. The volume nearest the first event began at 20:14 UTC.
8 thunderstorm wind, 1 tornado. Local standard time, as filed.
A few trees were blown down across Peoria Road in Springfield.
Downburst winds of 70 to 80 mph downed multiple large tree limbs, knocked over a few shallow-rooted trees, and blew down power poles in the Skyline Subdivision on the north side of Springfield.
Numerous large tree limbs were blown down around Springfield.
A tornado touched down in a field about 0.4 miles southwest of Cornland at 3:35 PM CDT. The tornado damaged the corn crop west of 1000th Avenue and north of State Highway 54 before quickly dissipating by 3:36 PM CDT.
A tree was blown down onto Route 54 near Chestnut.
An apple tree was snapped.
A large tree was blown down onto Route 54 at Richardson Street in Farmer City.
An 8-inch diameter tree branch was snapped.
Several 6 to 8-inch diameter tree limbs were blown down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2021Every state in 2021This day in weather historyThe tornado archive for Illinois, 2021Warnings in Illinois, June 2021
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: 960143, 960142, 960144, 960136, 960146, 960145, 960147, 960148, 960149.