Isolated thunderstorms moved across parts of northeast Illinois during the afternoon of June 1st producing isolated hail and isolated wind damage.
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 LOT wrote it up.
Isolated thunderstorms moved across parts of northeast Illinois during the afternoon of June 1st producing isolated hail and isolated wind damage.
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 Chicago, IL wrote its last area forecast discussion before the first event at Jun 1, 11:33 AM CST, 2 hours 17 minutes earlier.
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 1233 PM CDT Thu Jun 1 2023 .UPDATE... Issued at 1156 AM CDT Thu Jun 1 2023 Key Forecast Message: * Widely scattered pulse thunderstorms today, at least several miles inland of Lake Michigan Uncapped air mass with subtle convergence has quickly yielded widely scattered showers and thunderstorms from northwest Illinois southeastward to east central Illinois. A 500 mb impulse noted across northern Indiana and lower Michigan will also contribute to thunderstorms increasing in northwest Indiana. Owing to forcing from the slow moving 500 mb short-wave pivoting westward, expecting the lake breeze to light up as well. However, with steering flow aloft generally to the west, the threat for storms along the immediate lakeshore today is lower than yesterday. Will need to watch for strong to severe pulse storms today, though it appears lapse rates above 600 mb may somewhat mitigate the threat vs. what we saw yesterday, particularly regarding hail development. Very steep low level lapse rates could still contribute to localized downbursts with gusts up to 50 mph and a non-zero threat for marginally severe (near 60 mph) gusts. Thunderstorm coverage should steadily diminish with sunset this evening, with a few isolated cells possibly hanging on into the late evening hours. Castro && .SHORT TERM... Issued at 301 AM CDT Thu Jun 1 2023 Through Friday... Short term forecast concerns remain isolated to scattered thunderstorms across the area again today, and mainly across far western portions of the forecast area on Friday. Temperatures will continue to be very warm and summerlike outside of storms and the lake breeze, though it will be less humid by Friday afternoon. Weather pattern remains similar to Wednesday across the region, with the forecast area along the western periphery of upper ridging to the east and relatively weak south-southeasterly flow through the lower and mid levels. While difficult to see in current satellite imagery, vapor loop from Wednesday afternoon suggests a weak mid- level circulation is present across central IL. Though subtle, this shows up in the current RAP 500 mb wind initialization. Combined with our warm/moist low level air mass (progged to again diurnally yield around 1000 J/kg of MLCAPE), this is likely to support isolated to scattered showers and thunderstorms again from midday into early evening. Similar to yesterday, the lake breeze will likely be one focus for convective initiation along with other more subtle convergence and outflow boundaries. Weak flow through the column will again support slow storm movement and somewhat chaotic pulse propagation/evolution, and locally heavy downpours and gusty outflow winds will be possible with the stronger cores. On the larger scale, the upper ridge centered across the eastern Great Lakes is forecast to build slowly westward later today, which may tend to limit convective coverage across northwest Indiana later this afternoon especially away from the lake breeze or well-defined outflows. Coverage should gradually diminish elsewhere by early evening, with the decrease in diurnal warmth and instability. The upper ridge will continue to build west across the upper Midwest and western Lakes on Friday, with strengthening surface high pressure to the northeast of the Great Lakes region. Low level flow becomes more easterly, which advects substantially drier low level air mass into especially the eastern half of the forecast area in the afternoon. This should limit diurnal shower and thunderstorm development on Friday to areas closer to the Mississippi River, with areas east of the I-39 corridor expected to be dry. The air mass remains very warm for early June, and temperatures are once again expected to top out in the upper 80s and lower 90s today away from Lake Michigan. Though drier easterly flow develops Friday, low level temp profiles don't cool appreciably and the drier/sunnier conditions will likely support more widespread lower 90s away from Lake Michigan. Ratzer && .LONG TERM... Issued at 143 AM CDT Thu Jun 1 2023 Friday night through Wednesday... Mainly dry weather expected in the extended with high temps and possible elevated fire danger the main forecast concerns. Models differ on timing and strength of cool fronts moving southwest across the area, the first possibly on Sunday and another one early next week. Overall trends for these fronts look on track with a gradual cooling of high temps for early next week but low confidence on the specifics. GFS tries to generate some precipitation with these fronts. A few showers, possibly a thunderstorm can't be completely ruled out but not enough of a signal to have low chance pops for various periods, given the uncertain timing. Maintained the previous low chance shower mention for Tuesday. With persistent easterly flow, temps will remain cooler near Lake Michigan. Blended guidance already has minimum relative humidity levels in the 25-30 percent range from Saturday onward. Still uncertainty regarding how strong winds may become behind these fronts, but with a bit tighter gradient and mixing, combined with these already low relative humidity levels, which may end up even lower, there could be an elevated fire danger on some of these days though confidence too low to add mention to the HWO for now. cms && .AVIATION... For the 18Z TAFs... Forecast concerns for the terminals... *Scattered pop-up thunderstorms this afternoon *Light easterly winds and VFR conditions overnight into Friday morning Scattered showers and thunderstorms are starting to develop across much of central and northwestern Illinois as well as northern Indiana. The expectation is for storms to continue to develop through late afternoon mainly for areas away from Lake Michigan and near the I-39 corridor. However, a few storms may try to fire along the lake breeze as it continues to advance inland and an upper-level disturbance slides overhead. Though the thinking is that storms should remain west of the Chicago terminals, but I did maintain a VCTS mention for now to account for this potential. While widespread severe storms are not expected, a few more robust cores could produce briefly gusty winds in excess of 30 kts and heavy downpours which would reduce visibility. Thunderstorms are expected to taper around sunset as we lose diurnal heating which will leave dry and VFR conditions overnight into Friday morning. Winds (outside of thunderstorms) are also expected to remain easterly with speeds in the 5 to 10 kt range through the period. Yack && .LOT WATCHES/WARNINGS/ADVISORIES... IL...None. IN...None. LM...None. && Visit us at weather.gov/chicago Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSChicago www.twitter.com/NWSChicago www.youtube.com/NWSChicago
Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 1253 PM CDT Thu Jun 1 2023 ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002- 010-011-019-021800- Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage- La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford- Northern Cook-Central Cook-Southern Cook-Northern Will- Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton- 1253 PM CDT Thu Jun 1 2023 /153 PM EDT Thu Jun 1 2023/ This Hazardous Weather Outlook is for portions of North Central Illinois...Northeast Illinois and Northwest Indiana. .DAY ONE...This Afternoon and Tonight. Weather hazards expected... Limited Thunderstorm Risk. DISCUSSION... Scattered slow moving thunderstorms are likely through early this evening, primarily inland of Lake Michigan. The strongest storms will be capable of producing small hail and localized wind gusts up to 50 mph, strong enough to down small tree branches and move light objects. All thunderstorms can produce cloud to ground lightning strikes, and heavy downpours may produce localized ponding on roads, fields, and ditches. Thunderstorm coverage will diminish this evening, ending after sunset. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Friday... Limited Thunderstorm Risk. DISCUSSION... Additional isolated thunderstorms are possible Friday, generally along and west of the I-39 corridor across northwest Illinois. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be necessary through tonight. GENERAL STORM MOTION OF THE DAY: Erratic and at times stationary to west or northwest at 10 mph. LMZ740>745-021800- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 1253 PM CDT Thu Jun 1 2023 This Hazardous Weather Outlook is for portions of the Illinois nearshore waters of Lake Michigan and the Indiana nearshore waters of Lake Michigan. .DAY ONE...This Afternoon and Tonight. Weather hazards expected... Limited Thunderstorm Risk. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. Castro Visit us at www.weather.gov/chicago Follow us on Facebook, Twitter, and Youtube at: www.facebook.com/nwschicago www.twitter.com/nwschicago www.youtube.com/nwschicago
Special Weather Statement
National Weather Service Chicago/Romeoville
133 PM CDT Thu Jun 1 2023
ILZ039-011900-
Ford IL-
133 PM CDT Thu Jun 1 2023
...A strong thunderstorm will impact portions of southwestern Ford
County through 200 PM CDT...
At 133 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Gibson City, moving west at 10 mph.
HAZARD...Wind gusts of 50 to 55 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Melvin and Elliott.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4045 8836 4062 8835 4062 8824 4063 8823
4062 8820 4044 8821
TIME...MOT...LOC 1833Z 088DEG 10KT 4054 8828
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH
YackThe Chicago radar (KLOT), 13 km away, was scanning. The volume nearest the first event began at 19:47 UTC.
1 hail, 1 thunderstorm wind. Local standard time, as filed.
Hail fell for almost ten minutes with the largest hail roughly quarter size.
Several tree limbs up to 6 inches in diameter were snapped off of trees.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2023Every state in 2023This day in weather historyWarnings in Illinois, June 2023
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: 1093246, 1093245.