A nearly stationary frontal boundary interacting with a warm and humid airmass triggered numerous clusters of strong to severe thunderstorms across central Illinois during the late morning and early afternoon of June 9th. The strongest cells produced damaging wind gusts of 60-70mph.
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 ILX wrote it up.
A nearly stationary frontal boundary interacting with a warm and humid airmass triggered numerous clusters of strong to severe thunderstorms across central Illinois during the late morning and early afternoon of June 9th. The strongest cells produced damaging wind gusts of 60-70mph.
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 9, 9:40 AM CST, 40 minutes earlier.
Area Forecast Discussion National Weather Service Lincoln IL 1040 AM CDT Sat Jun 9 2018 .UPDATE... Issued at 1040 AM CDT Sat Jun 9 2018 Updated the forecast to make adjustments to temperatures and PoPs/Weather due to the convection systems affecting the forecast area. Large convective complex moved into the forecast area early this morning from NW IL and has just weakened. However, additional storms have developed on the strong outflow that continues sinking to the south. Another convective cluster from southeast IA is expected to move into west central and central IL late this morning into the early afternoon. Another round of convection is expected this evening at some point, but timing on this is in question since none of the convective models have a clue with any of the activity today. For now, will stick with highs in the upper 80s/lower 90s, but will monitor the next few hours. There is alot of convective cloud cover, which is inhibiting heating in central IL. However, there are several breaks in the clouds in between systems and this time of year it doesn't take the atmosphere very long to recover temperature-wise. && .SHORT TERM...(Today and tonight) ISSUED AT 345 AM CDT Sat Jun 9 2018 A weak short wave tracking into nw IL early this morning was producing a cluster of showers and thunderstorms over northern IL north of I-80 and into southern WI and tracking slowly ese. A small area of convection was over northern IN and drifting slowly east. An outflow boundary from convection in northern IL had passed south of Moline, Lacon and Pontiac, with mild temps in the low to mid 70s south of this boundary over much of CWA. Lacon was down to 67F with light east wind. Moist dewpoints were in the mid 60s to around 70F. Latest CAM models show weak short wave over nw IL tracking slowly se into central/northeast IL during this morning, with scattered convection from I-74 northeast and more isolated sw of I-74. Airmass gets very unstable this afternoon as CAPES rise above 2500 j/kg especially north of I-70, while wind shear stays weak. Expect isolated to scattered convection to develop by late afternoon and become more widespread during tonight. SPC day1 outlook has marginal risk of severe storms late this afternoon and evening for wind and hail. Heavy rains also a risk due to high precipitable water values of 1.5-2 inches today and peaking form 2-2.4 inches north of I-72 this evening where highest (likely) pops are. Highs today in the upper 80s from I-74 north where more cloud cover and higher rain chances, and lower 90s south of I-74. Afternoon heat indices peak in the low to mid 90s with highest readings south of I-74. Muggy lows tonight in the upper 60s and lower 70s. .LONG TERM...(Sunday through Friday) ISSUED AT 345 AM CDT Sat Jun 9 2018 Isolated to scattered showers and thunderstorms to continue Sunday. Instability/CAPES become highest Sunday afternoon sw of I-74 and this area will have marginal risk of severe storms later Sunday afternoon into Sunday evening for wind and hail. Locally heavy rains possible too with precipitable water values of 1.5-2 inches. Slightly cooler highs Sunday in the 85-90F range, warmest over sw cwa and southeast IL. Heat indices Sunday afternoon peak from 90-96F. Lows Sunday night in the upper 60s and lower 70s, mildest sw cwa and southeast IL. Convection chances continue Monday as airmass gets more unstable again with CAPES rising above 2500 J/kg Monday afternoon except 2000-2500 j/kg over east central IL. Marginal risk of severe storms over most of CWA later Monday afternoon into Monday evening for wind and hail. Highs similar to today with upper 80s from I-74 north and lower 90s south of I-74. Heat indices peak in the 90s Monday afternoon, warmest sw CWA. A weak cold front to push southeast over central IL later Monday night into Tue and likely brings more showers and thunderstorms. A few strong thunderstorms may occur in southeast IL Tuesday afternoon especially if front slows down. Highs Tue range from lower 80s by Galesburg, to near 90F southeast of I-70. Dry conditions expected to briefly return Tue night and Wed as weak high pressure settles into the area by Wed morning. Somewhat cooler and less humid air returns with lows Tue night in the lower 60s central IL and mid 60s southeast IL, with Galesburg possibly getting into the upper 50s. Highs wed in the mid 80s central IL and upper 80s southeast IL and afternoon heat indices nearly match those numbers with lower dewpoints in the upper 50s to near 60F. Models differ with handling more short waves ridging over top of upper level ridge into the area from Thu on, with GFS model staying dry from Wed thru Friday, while Ecmwf and GEM bring qpf into area later Wed night and Thu. Will stay close to consensus that far out with some pops returning by overnight Wed night into Thu night, then mostly dry on Friday. Temperatures and humidity levels appear to rise again later next week as summer pattern prevails. && .AVIATION...(For the 12Z TAFS through 12Z Sunday morning) Issued at 651 AM CDT Sat Jun 9 2018 A cluster of thunderstorms will pass near KPIA, KBMI, and KCMI this morning, although most of the storms should stay over northern Illinois. While an additional thunderstorm can't be ruled out later today, better chances return toward midnight tonight or later as a weather disturbance crosses the area. VFR conditions will prevail outside of any thunderstorms, and confidence in exact time/location of storms is too low to go above a VCTS mention. && .ILX WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE...Miller SHORT TERM...07 LONG TERM...07 AVIATION...Bak
Hazardous Weather Outlook National Weather Service Lincoln IL 600 AM CDT Sat Jun 9 2018 ILZ027>031-036>038-040>057-061>063-066>068-071>073-101100- Cass-Champaign-Christian-Clark-Clay-Coles-Crawford-Cumberland- De Witt-Douglas-Edgar-Effingham-Fulton-Jasper-Knox-Lawrence-Logan- Macon-Marshall-Mason-McLean-Menard-Morgan-Moultrie-Peoria-Piatt- Richland-Sangamon-Schuyler-Scott-Shelby-Stark-Tazewell-Vermilion- Woodford- 600 AM CDT Sat Jun 9 2018 This Hazardous Weather Outlook is for portions of central Illinois, east central Illinois, southeast Illinois and west central Illinois. .DAY ONE...TODAY AND TONIGHT... Scattered thunderstorms will be possible through tonight, with the best chances expected this morning and again after midnight tonight. Although organized severe weather is not anticipated, the stronger storms will be capable of producing gusty winds, hail, frequent lightning and torrential rainfall. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... A typical summer-time pattern is expected over the region into early next week with daily chances for thunderstorms through Tuesday. There is a marginal risk for strong to locally severe thunderstorms Sunday and Monday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. Bak
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
724 AM CDT SAT JUN 9 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 AM HEAVY RAIN LACON 41.02N 89.41W
06/09/2018 M1.30 INCH MARSHALL IL CO-OP OBSERVER
SO FAR...STILL RAINING.
&&
SBAKERPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
727 AM CDT SAT JUN 9 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0717 AM HAIL NW PEORIA 40.74N 89.61W
06/09/2018 E0.50 INCH PEORIA IL BROADCAST MEDIA
&&
SBAKERPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
848 AM CDT SAT JUN 9 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN GALESBURG 40.95N 90.38W
06/09/2018 M1.26 INCH KNOX IL CO-OP OBSERVER
RAINFALL FROM THIS MORNING.
&&
SBAKERSpecial Weather Statement National Weather Service Lincoln IL 947 AM CDT SAT JUN 9 2018 ILZ051>053-061-091545- Sangamon-Macon-Christian-Shelby- 947 AM CDT SAT JUN 9 2018 ...SIGNIFICANT WEATHER ADVISORY FOR CHRISTIAN...NORTHEASTERN SANGAMON AND SOUTHWESTERN MACON COUNTIES UNTIL 1045 AM CDT... At 947 AM CDT, Doppler radar was tracking a strong thunderstorm near Rochester, or 10 miles east of Springfield, moving southeast at 20 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Springfield, Taylorville, Rochester, Moweaqua, Kincaid, Blue Mound, Macon, Edinburg, Stonington, Mechanicsburg, Mount Auburn, Bulpitt, Jeisyville, Tovey, Dawson, Buffalo, Berry, Owaneco, Sangchris Lake State Park and Willeys. This includes Interstate 72 between mile markers 112 and 120. LAT...LON 3972 8961 3988 8942 3971 8890 3936 8930 TIME...MOT...LOC 1447Z 311DEG 18KT 3974 8945 Auten
Special Weather Statement
National Weather Service Lincoln IL
1110 AM CDT SAT JUN 9 2018
ILZ040-091700-
Schuyler-
1110 AM CDT SAT JUN 9 2018
...SIGNIFICANT WEATHER ADVISORY FOR SCHUYLER COUNTY UNTIL NOON CDT...
At 1110 AM CDT, Doppler radar was tracking a strong thunderstorm near
Augusta, or 15 miles northwest of Rushville, moving east at 20 mph.
Dime size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Rushville, Littleton, Huntsville, Camden, Weinberg King State Park
and Ray.
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 4029 9091 4028 9066 4028 9047 4027 9046
4006 9048 4009 9070 4010 9070 4011 9071
4010 9079 4012 9091
TIME...MOT...LOC 1610Z 275DEG 17KT 4022 9083
AutenThe Lincoln radar (KILX), 122 km away, was scanning. The volume nearest the first event began at 16:18 UTC.
3 thunderstorm wind. Local standard time, as filed.
Numerous trees were blown down in Brooklyn.
Numerous trees were blown down in Rushville.
A power pole was blown down in Beardstown.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2018Every state in 2018This day in weather historyWarnings in Illinois, June 2018
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: 757327, 757328, 757329.