Isolated thunderstorms developed within a very warm and humid airmass across central Illinois during the afternoon and early evening of June 29th. One cell produced gusty winds that knocked a large tree branch onto a vehicle on the southwest side of Champaign.
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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.
Isolated thunderstorms developed within a very warm and humid airmass across central Illinois during the afternoon and early evening of June 29th. One cell produced gusty winds that knocked a large tree branch onto a vehicle on the southwest side of Champaign.
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 29, 6:08 PM CST, 1 hour 7 minutes earlier.
Area Forecast Discussion National Weather Service Lincoln IL 708 PM CDT Thu Jun 29 2017 .SHORT TERM...(This evening through Friday) ISSUED AT 300 PM CDT Thu Jun 29 2017 An MCV over central MO had convection from central MO and developing recently into central IL near I-72. Also have a band of showers spreading east over the IL river valley. CAPES have increased to 1200-2200k J/KG from I-72 south with 2-3k J/KG over southern IL near I-64 and pockets over western/sw IN. Have a lingering cap over central IL though this has been weakening se of the IL river where more filtered sunshine and heating into the mid to upper 80s. Dewpoints were higher today, in the mid 60s over IL river valley and near 70F in southeast IL from Taylorville to Danville se. 1st wave of scattered convection to spread east over central IL this afternoon and depart by sunset, with a 2nd wave spreading east from northern MO into central IL later this evening and overnight. HRRR model has been quicker and further south with its convection and 2nd wave gets into southeast IL overnight. Good chance of showers and thunderstorms redeveloping over CWA during Friday in unstable airmass. SPC has slight risk of severe storms through tonight north of I-70 and marginal risk of severe storms on Friday across CWA. Think areas se of I-55 will have strongest storms on Friday afternoon thru sunset. Lows overnight in the lower 70s, with some upper 60s nw of the IL river. Highs Friday in the mid 80s, except lower 80s nw of the IL river. .LONG TERM...(Friday night through Thursday) ISSUED AT 300 PM CDT Thu Jun 29 2017 Highest convection chances shift into southeast IL during Friday night as frontal boundary pushes through area. Lows Fri night range from lower 60s nw of IL river to near 70F by Lawrenceville. The front will be near the Ohio river valley and lingered isolated convection se IL Sat morning. Highs Sat in the lower 80s over central IL and mid 80s in southeast IL. Getting less humid during the day Saturday with wnw flow as dewpoints slip into the upper 50s/lower 60s Sat afternoon in central IL and mid 60s in southeast IL. Dry weather expected from Sat afternoon through most of Sunday as weak high pressure settles in. Lows Sat night in the lower 60s with some upper 50s north of Peoria. Seasonable highs Sunday in the mid 80s with dewpoints in the lower 60s. Isolated convection could affect areas nw of the IL river late Sunday afternoon, then have chance of showers and thunderstorms along and north of I-72 Sunday night. This due to a disturbance dropping into the Great Lakes region where a weak upper level trof is located then. More humid/tropical airmass returns Mon-Thu along with more unsettled weather pattern and daily chances of showers/thunderstorms. Best chances on Monday still appear north of I-70 with just isolated convection se of I-70 Monday afternoon. Better chances of convection with possible MCS arrive across area Monday night, and more development of convection Tue/Tue night with approaching upper level trof. This feature moves east over IA/MO Tue night and Wed and into IL Wed night and Thu and will likely bring more chances of showers and thunderstorms. Seasonable highs in the mid to upper 80s Monday, low to mid 80s Tue and mid 80s Wed/Thu. Rather humid as well with dewpoints rising into the upper 60s/lower 70s. && .AVIATION...(For the 00Z TAFS through 00Z Friday evening) Issued at 708 PM CDT Thu Jun 29 2017 Several disturbances may affect central IL TAF sites over the upcoming 24 hours producing thunderstorm activity. In the short term, a departing mesoscale convective vortex will continue to produce a few thunderstorms through evening today, mainly for eastern TAF sites KBMI-KCMI-KDEC where mention of thunder included in 00Z TAFs. After approximately 06Z...convection over northern Missouri will likely push eastward and may affect southern TAF sites KSPI-KDEC. Finally, a shortwave over NB/IA this evening is expected to develop significant thunderstorm activity pushing eastward overnight. This system and an associated frontal boundary pushing into the region Friday will bring good chances for rain showers and thunderstorms, although timing of the feature remains highly uncertain still. Winds generally S-SW under 10 kts overnight, increasing to 10-15 kts after 12Z, although some variability in direction associated with shower and thunderstorm activity. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...07 LONG TERM...07 AVIATION...37
Hazardous Weather Outlook National Weather Service Lincoln IL 303 PM CDT Thu Jun 29 2017 ILZ027>031-036>038-040>057-061>063-066-301100- Cass-Champaign-Christian-Clark-Coles-Cumberland-De Witt-Douglas- Edgar-Effingham-Fulton-Knox-Logan-Macon-Marshall-Mason-McLean- Menard-Morgan-Moultrie-Peoria-Piatt-Sangamon-Schuyler-Scott- Shelby-Stark-Tazewell-Vermilion-Woodford- 303 PM CDT Thu Jun 29 2017 This Hazardous Weather Outlook is for portions of central Illinois, east central Illinois, southeast Illinois and west central Illinois. .DAY ONE...TONIGHT... Storms will become more numerous tonight, especially during the evening hours. Some of the storms may become severe, with damaging wind gusts the primary severe threat. Locally heavy rainfall is also possible. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... Thunderstorm chances will linger into Friday night. Strong storms are possible Friday, with gusty winds and locally heavy rainfall possible. Thunderstorm chances return by early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required tonight, with the most likely time frame between 7 pm and 1 am. ILZ067-068-071>073-301100- Clay-Crawford-Jasper-Lawrence-Richland- 303 PM CDT Thu Jun 29 2017 This Hazardous Weather Outlook is for portions of southeast Illinois. .DAY ONE...TONIGHT... Strong thunderstorms are possible tonight. Severe storms are not expected at this time, but gusty winds and locally heavy rainfall are possible. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... Thunderstorm chances increase Friday into Friday night. Widespread severe weather is not expected, however a few strong storms will be possible again Friday. Thunderstorm chances return by early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. Barker
Special Weather Statement National Weather Service Lincoln IL 345 PM CDT THU JUN 29 2017 ILZ046-292130- Vermilion- 345 PM CDT THU JUN 29 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN VERMILION COUNTY UNTIL 430 PM CDT... At 344 PM CDT, Doppler radar was tracking a strong thunderstorm over Catlin, or 7 miles southwest of Danville, moving east at 30 mph. Winds in excess of 40 mph will be possible with this storm. Locations impacted include... Danville, Georgetown, Westville, Tilton, Catlin, Oakwood, Belgium, Indianola, Vermilion County Airport and Kickapoo State Park. This includes Interstate 74 between mile markers 208 and 220. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3993 8774 4010 8781 4025 8753 3997 8753 TIME...MOT...LOC 2044Z 251DEG 24KT 4004 8768 Barker
Special Weather Statement National Weather Service Lincoln IL 723 PM CDT THU JUN 29 2017 ILZ038-300045- McLean- 723 PM CDT THU JUN 29 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MCLEAN COUNTY UNTIL 745 PM CDT... At 722 PM CDT, Doppler radar was tracking a strong thunderstorm over Saybrook, or 9 miles southwest of Gibson City, moving northeast at 40 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Saybrook and Arrowsmith. LAT...LON 4037 8846 4034 8859 4046 8868 4058 8846 TIME...MOT...LOC 0022Z 238DEG 36KT 4041 8854 37
Special Weather Statement National Weather Service Lincoln IL 806 PM CDT THU JUN 29 2017 ILZ044-045-300130- Piatt-Champaign- 806 PM CDT THU JUN 29 2017 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL PIATT AND CENTRAL CHAMPAIGN COUNTIES UNTIL 830 PM CDT... At 806 PM CDT, Doppler radar was tracking a strong thunderstorm over Seymour, or 8 miles northeast of Monticello, moving east at 30 mph. Dime size hail and wind gusts of 50 to 55 mph will be possible with this storm. Locations impacted include... Champaign, Urbana, Savoy, Mahomet, St. Joseph, Tolono, Sidney, Thomasboro, Bondville, Lake Of The Woods, Seymour, White Heath and Willard Airport. This includes the following highways... Interstate 57 between mile markers 227 and 246. Interstate 72 between mile markers 169 and 182. Interstate 74 between mile markers 172 and 193. LAT...LON 3997 8850 4015 8857 4029 8809 4003 8800 TIME...MOT...LOC 0106Z 254DEG 26KT 4008 8844 37
The Lincoln radar (KILX), 90 km away, was scanning. The volume nearest the first event began at 01:16 UTC.
1 thunderstorm wind. Local standard time, as filed.
A large tree branch was blown onto a vehicle in the 2300 block of Rebecca Drive on the southwest side of Champaign.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2017Every state in 2017This day in weather historyWarnings in Illinois, June 2017
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: 700322.