Alert archive / Illinois / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 49, NWS Chicago, IL

May 24, 2024Grundy County, Kendall County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 24, 2024, 11:09 AM CDT for Grundy County, Kendall County, Illinois. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 24, 2024, 11:09 AM CDT (16:09 UTC)
Expired
May 24, 2024, 12:00 PM CDT
In force
51 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Grundy County, IL, Kendall County, IL

The radar

The Chicago radar (KLOT), 34 km from the middle of the area, began a volume at 16:10 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 24, 6:07 AM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.2 hours before the alert went out and 144 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2024-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1248 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2024-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1248 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at May 24, 6:30 AM CDT, 4 hours 39 minutes earlier.

Area forecast discussion, May 24, 6:30 AM CDT, 4 hours 39 minutes before
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Hazardous weather outlook, May 24, 6:25 AM CDT, 4 hours 44 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Chicago/Romeoville IL
625 AM CDT Fri May 24 2024

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-251130-
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-
625 AM CDT Fri May 24 2024 /725 AM EDT Fri May 24 2024/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Limited Tornado Risk.
     Limited Hail Risk...up to quarter size.
     Limited Damaging Wind Risk...up to 70 mph.
  Limited Flooding Risk.

DISCUSSION...

There will be several periods of thunderstorms today. The first
will be mid to late morning, with the highest coverage
west of Chicago. The severe threat is medium with these storms, but
damaging winds will be the main hazard. Additional
scattered thunderstorms, some of which may be severe, are likely
mid afternoon through the early evening. Damaging wind gusts are
the primary severe threat, but isolated large hail is also
possible along with a few tornadoes. The tornado threat is highest
from the Chicago metro area westward.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Elevated Thunderstorm Risk with a:
    Limited Severe Thunderstorm Risk.
  Limited Flooding Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.
Thursday...
  Limited Thunderstorm Risk.

DISCUSSION...

Additional waves of thunderstorms are likely on Sunday into
Sunday evening. Severe thunderstorms will again be possible,
primarily Sunday afternoon until around sunset.

Any focused corridors of heavy rainfall from thunderstorms on
Sunday may result in localized flooding.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed mid to late morning through early evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 40 to 50 mph this morning, 35 to
  40 mph this afternoon and evening.

LMZ740>745-251130-
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-
625 AM CDT Fri May 24 2024

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...Today and Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Waterspout Risk
     Limited Hail Risk...up to quarter size.
     Limited Thunderstorm Wind Gust Risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Sunday...
  Hazardous conditions for small craft are likely.
  Elevated Thunderstorm Risk with a:
    Limited Severe Thunderstorm Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

KMD

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In the hours before

Special weather statement, May 24, 9:37 AM CDT, 1 hour 32 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
937 AM CDT Fri May 24 2024

ILZ003-241515-
Winnebago IL-
937 AM CDT Fri May 24 2024

...STRONG THUNDERSTORMS WILL IMPACT WINNEBAGO COUNTY THROUGH 1015 AM
CDT...

At 937 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles north of Lake Summerset to near German
Valley. Movement was east at 45 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Machesney Park, Roscoe, South Beloit, Rockton, Winnebago,
Pecatonica, Durand, Seward, Harrison, Shirland, and Lake Summerset.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
north central Illinois.

&&

LAT...LON 4249 8894 4248 8894 4220 8917 4220 8940
      4250 8940
TIME...MOT...LOC 1437Z 252DEG 39KT 4253 8943 4222 8954

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Kluber
Special weather statement, May 24, 9:48 AM CDT, 1 hour 21 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
948 AM CDT Fri May 24 2024

ILZ008-010-241530-
Ogle IL-Lee IL-
948 AM CDT Fri May 24 2024

...STRONG THUNDERSTORMS WILL IMPACT OGLE AND EASTERN LEE COUNTIES
THROUGH 1030 AM CDT...

At 947 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Mount Morris to near Ashton to near
Sublette. Movement was east at 35 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Rochelle, Byron, Oregon, Mount Morris, Davis Junction, Hillcrest,
Stillman Valley, Franklin Grove, Ashton, Paw Paw, Lost Nation,
Sublette, Woodhaven Lakes, Creston, Lindenwood, Monroe Center, Leaf
River, Lee, Compton, Steward, West Brooklyn, Adeline, Kings, Chana,
and Lee Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
north central Illinois.

&&

LAT...LON 4221 8917 4215 8917 4215 8894 4163 8894
      4163 8917 4158 8917 4159 8927 4189 8936
      4220 8954
TIME...MOT...LOC 1447Z 259DEG 32KT 4213 8945 4190 8928 4161 8921

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Kluber
Special weather statement, May 24, 11:06 AM CDT, 3 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
1106 AM CDT Fri May 24 2024

ILZ020-241630-
Kendall IL-
1106 AM CDT Fri May 24 2024

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL KENDALL COUNTY THROUGH
1130 AM CDT...

At 1106 AM CDT, Doppler radar was tracking a strong thunderstorm near
Newark, or near Yorkville, moving east at 25 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Joliet, Plainfield, Oswego, Yorkville, Newark, Millington, Millbrook,
and Plattville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 100 PM CDT for
north central and northeastern Illinois.

&&

LAT...LON 4167 8826 4150 8825 4151 8860 4161 8860
TIME...MOT...LOC 1606Z 263DEG 23KT 4157 8850

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

Kluber

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 24, 8:58 AM CDTSevere Thunderstorm WarningLOTLee, Ogle62 min
May 24, 9:37 AM CDTSpecial Weather StatementLOTWinnebago38 min
May 24, 9:48 AM CDTSpecial Weather StatementLOTLee, Ogle42 min
May 24, 11:06 AM CDTSpecial Weather StatementLOTKendall24 min
May 24, 11:31 AM CDTSevere Thunderstorm WarningLOTGrundy, Will59 min
May 24, 12:06 PM CDTSevere Thunderstorm WarningLOTCook, DuPage, Will54 min
May 24, 12:07 PM CDTSpecial Marine WarningLOT113 min
May 24, 12:53 PM CDTSevere Thunderstorm WarningLOTCook, Will67 min
May 24, 1:07 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois68 min
May 24, 1:53 PM CDTSpecial Marine WarningLOT41 min
May 24, 2:11 PM CDTSevere Thunderstorm WarningLOTIroquois49 min
May 24, 4:07 PM CDTSpecial Weather StatementLOTBoone, DeKalb, LaSalle, Lee, Ogle, Winnebago68 min
May 24, 4:57 PM CDTSpecial Weather StatementLOTFord, Iroquois63 min
May 24, 6:01 PM CDTSpecial Weather StatementLOTWinnebago29 min
May 24, 6:17 PM CDTSpecial Weather StatementLOTBoone43 min
May 24, 6:31 PM CDTSpecial Weather StatementLOTMcHenry44 min
May 24, 1:35 PM CDTSevere Thunderstorm WarningLOTPorter55 min
May 24, 2:14 PM CDTSpecial Weather StatementLOTNewton46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2024Every severe thunderstorm warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.