Alert archive / Illinois / Flash Flood Watches in 2021

Flash Flood Watch 1, NWS Chicago, IL

June 24, 20215 counties in Indiana; 13 counties in Illinois

NWS Chicago, IL issued this flash flood watch at Jun 24, 2021, 3:19 PM EDT for 5 counties in Indiana; 13 counties in Illinois. It took effect at Jun 24, 2021, 8:00 PM EDT. It was in force for 50 hr.

The area

The counties it named.

The facts

Issued
Jun 24, 2021, 3:19 PM EDT (19:19 UTC)
In effect from
Jun 24, 2021, 8:00 PM EDT
Expired
Jun 26, 2021, 9:40 PM EDT
In force
50 hr
Issued by
NWS Chicago, IL
Flood severity
None

Counties Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Will County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 31 km from the middle of the area, began a volume at 19:19 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.3 hours before the alert went out and 139 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 2021-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1467 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted.

400 
WGUS63 KLOT 241919
FFALOT

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Chicago IL
219 PM CDT Thu Jun 24 2021

ILZ019-021-023-032-033-039-107-INZ010-011-019-250330-
/O.NEW.KLOT.FF.A.0001.210625T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Will-
Newton-Jasper-Benton-
Including the cities of Gilman, Kentland, Marseilles, Gibson City, 
La Salle, Manhattan, DeMotte, Watseka, Pontiac, Mendota, 
Bourbonnais, Streator, Oxford, Roselawn, Kankakee, Wilmington, 
Minooka, Ottawa, Morocco, Morris, Rensselaer, Fowler, Paxton, 
Dwight, Channahon, Bradley, Coal City, and Fairbury
219 PM CDT Thu Jun 24 2021 /319 PM EDT Thu Jun 24 2021/

...FLASH FLOOD WATCH IN EFFECT FROM 7 PM CDT /8 PM EDT/ THIS EVENING 
THROUGH SATURDAY MORNING...

The National Weather Service in Chicago has issued a

* Flash Flood Watch for portions of Illinois and northwest Indiana, 
  including the following areas, in Illinois, Ford, Grundy, 
  Iroquois, Kankakee, La Salle, Livingston and Southern Will. In 
  northwest Indiana, Benton, Jasper and Newton.

* From 7 PM CDT /8 PM EDT/ this evening through Saturday morning

* Several rounds of thunderstorms are expected tonight through early 
  Saturday morning. Flash flooding will be possible as heavy rain 
  producing storms move repeatedly over the same location.

* Excessive runoff may result in flooding of rivers, streams and 
  other low-lying and flood-prone areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Birk
9 follow-up statements
729 
WGUS63 KLOT 250238
FFALOT

Flood Watch
National Weather Service Chicago IL
938 PM CDT Thu Jun 24 2021

ILZ019-021-023-032-033-039-107-INZ010-011-019-251200-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Will-
Newton-Jasper-Benton-
Including the cities of Gilman, Kentland, Marseilles, Gibson City, 
La Salle, Manhattan, DeMotte, Watseka, Pontiac, Mendota, 
Bourbonnais, Streator, Oxford, Roselawn, Kankakee, Wilmington, 
Minooka, Ottawa, Morocco, Morris, Rensselaer, Fowler, Paxton, 
Dwight, Channahon, Bradley, Coal City, and Fairbury
938 PM CDT Thu Jun 24 2021 /1038 PM EDT Thu Jun 24 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Ford, Grundy, Iroquois, Kankakee, La 
  Salle, Livingston and Southern Will. In northwest Indiana, Benton, 
  Jasper and Newton.

* Through Saturday morning

* Several rounds of thunderstorms are expected through early 
  Saturday morning. Flash flooding will be possible as storms with 
  heavy rain move repeatedly over the same location.

* Excessive runoff may result in flooding of rivers, streams and 
  other low-lying and flood-prone areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Kluber
987 
WGUS63 KLOT 250706
FFALOT

Flood Watch
National Weather Service Chicago IL
206 AM CDT Fri Jun 25 2021

ILZ010>013-020-103>106-108-INZ001-002-251515-
/O.EXA.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lee-De Kalb-Kane-DuPage-Kendall-Northern Cook-Central Cook-Southern
Cook-Northern Will-Eastern Will-Lake IN-Porter-
Including the cities of La Grange, Carol Stream, Calumet City, 
Chicago, Portage, Wheaton, Evanston, Palatine, Beecher, Dixon, 
Downers Grove, DeKalb, Merrillville, Chesterton, Park Forest, 
Lombard, Oak Lawn, Aurora, Hammond, Lemont, Plano, Sycamore, 
Valparaiso, Bolingbrook, Cicero, Joliet, Oak Park, Gary, Elgin, Des 
Plaines, Orland Park, Mokena, Oswego, Oak Forest, Plainfield, 
Yorkville, Northbrook, Peotone, Crete, Naperville, and Schaumburg
206 AM CDT Fri Jun 25 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY MORNING...

The National Weather Service in Chicago has expanded the

* Flash Flood Watch to include portions of Illinois and northwest 
  Indiana, including the following areas, in Illinois, Central Cook, 
  De Kalb, DuPage, Eastern Will, Kane, Kendall, Lee, Northern Cook, 
  Northern Will and Southern Cook. In northwest Indiana, Lake IN and 
  Porter.

* Through Saturday morning

* Several rounds of torrential rainfall producing thunderstorms will 
  move through northern Illinois and northwestern Indiana through 
  early Saturday morning. Additional rounds of thunderstorms may 
  occur into early Sunday morning, as well. Accordingly, the Flash 
  Flood Watch may be extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

ILZ019-021-023-032-033-039-107-INZ010-011-019-251515-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Will-
Newton-Jasper-Benton-
Including the cities of Gilman, Kentland, Marseilles, Gibson City, 
La Salle, Manhattan, DeMotte, Watseka, Pontiac, Mendota, 
Bourbonnais, Streator, Oxford, Roselawn, Kankakee, Wilmington, 
Minooka, Ottawa, Morocco, Morris, Rensselaer, Fowler, Paxton, 
Dwight, Channahon, Bradley, Coal City, and Fairbury
206 AM CDT Fri Jun 25 2021 /306 AM EDT Fri Jun 25 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Ford, Grundy, Iroquois, Kankakee, La 
  Salle, Livingston and Southern Will. In northwest Indiana, Benton, 
  Jasper and Newton.

* Through Saturday morning

* Several rounds of torrential rainfall producing thunderstorms will 
  move through northern Illinois and northwestern Indiana through 
  early Saturday morning. Additional rounds of thunderstorms may 
  occur into early Sunday morning, as well. Accordingly, the Flash 
  Flood Watch may be extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Borchardt
520 
WGUS63 KLOT 251451
FFALOT

Flood Watch
National Weather Service Chicago IL
951 AM CDT Fri Jun 25 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-011-019-
252300-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Fowler, Wheaton, Evanston, 
Marseilles, Palatine, Beecher, Gibson City, Dixon, Downers Grove, 
DeKalb, La Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, 
Lombard, Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, 
Manhattan, Lemont, Streator, Oxford, Plano, Channahon, Sycamore, 
Gary, Valparaiso, Bolingbrook, Kankakee, Wilmington, Minooka, 
Ottawa, Morocco, Morris, Oak Lawn, Rensselaer, Peotone, Joliet, 
Paxton, Oak Park, Dwight, Cicero, Park Forest, Elgin, Des Plaines, 
Orland Park, Mokena, Oswego, Oak Forest, Plainfield, Yorkville, 
Bradley, Coal City, Crete, Fairbury, DeMotte, Naperville, and 
Schaumburg
951 AM CDT Fri Jun 25 2021 /1051 AM EDT Fri Jun 25 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Central Cook, De Kalb, DuPage, 
  Eastern Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
  Salle, Lee, Livingston, Northern Cook, Northern Will, Southern 
  Cook and Southern Will. In northwest Indiana, Benton, Jasper, Lake 
  IN, Newton and Porter.

* Through Saturday morning

* Another round of torrential rainfall producing thunderstorms will 
  move through northern Illinois and northwestern Indiana tonight 
  into early Saturday morning. Additional rounds of thunderstorms 
  may occur into early Sunday morning, as well. Accordingly, the 
  Flash Flood Watch may be extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Birk
652 
WGUS63 KLOT 252047
FFALOT

Flood Watch
National Weather Service Chicago IL
347 PM CDT Fri Jun 25 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-011-019-
260500-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Fowler, Wheaton, Evanston, 
Marseilles, Palatine, Beecher, Gibson City, Dixon, Downers Grove, 
DeKalb, La Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, 
Lombard, Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, 
Manhattan, Lemont, Streator, Oxford, Plano, Channahon, Sycamore, 
Gary, Valparaiso, Bolingbrook, Kankakee, Wilmington, Minooka, 
Ottawa, Morocco, Morris, Oak Lawn, Rensselaer, Peotone, Joliet, 
Paxton, Oak Park, Dwight, Cicero, Park Forest, Elgin, Des Plaines, 
Orland Park, Mokena, Oswego, Oak Forest, Plainfield, Yorkville, 
Bradley, Coal City, Crete, Fairbury, DeMotte, Naperville, and 
Schaumburg
347 PM CDT Fri Jun 25 2021 /447 PM EDT Fri Jun 25 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Central Cook, De Kalb, DuPage, 
  Eastern Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
  Salle, Lee, Livingston, Northern Cook, Northern Will, Southern 
  Cook and Southern Will. In northwest Indiana, Benton, Jasper, Lake 
  IN, Newton and Porter.

* Through Saturday morning

* Another round of torrential rainfall producing thunderstorms will 
  move through northern Illinois and northwestern Indiana tonight 
  into early Saturday morning. Additional rounds of thunderstorms 
  may occur into early Sunday morning, as well. Accordingly, the 
  Flash Flood Watch may be extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Birk
259 
WGUS63 KLOT 260355
FFALOT

Flood Watch
National Weather Service Chicago IL
1055 PM CDT Fri Jun 25 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-011-019-
261200-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210626T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Fowler, Wheaton, Evanston, 
Marseilles, Palatine, Beecher, Gibson City, Dixon, Downers Grove, 
DeKalb, La Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, 
Lombard, Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, 
Manhattan, Lemont, Streator, Oxford, Plano, Channahon, Sycamore, 
Gary, Valparaiso, Bolingbrook, Kankakee, Wilmington, Minooka, 
Ottawa, Morocco, Morris, Oak Lawn, Rensselaer, Peotone, Joliet, 
Paxton, Oak Park, Dwight, Cicero, Park Forest, Elgin, Des Plaines, 
Orland Park, Mokena, Oswego, Oak Forest, Plainfield, Yorkville, 
Bradley, Coal City, Crete, Fairbury, DeMotte, Naperville, and 
Schaumburg
1055 PM CDT Fri Jun 25 2021 /1155 PM EDT Fri Jun 25 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT/8 AM EDT/ 
SATURDAY...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Central Cook, De Kalb, DuPage, 
  Eastern Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
  Salle, Lee, Livingston, Northern Cook, Northern Will, Southern 
  Cook and Southern Will. In northwest Indiana, Benton, Jasper, Lake 
  IN, Newton and Porter.

* Until 7 AM CDT/8 AM EDT/ Saturday

* Torrential rainfall-producing thunderstorms will continue to move 
  through northern Illinois and northwestern Indiana tonight into 
  early Saturday morning. Flash flooding has already occurred near 
  Bloomington, IL and may occur elsewhere overnight where heavy rain 
  falls for a prolonged period of time. Additional rounds of 
  thunderstorms may occur into early Sunday morning, as well. 
  Accordingly, the Flash Flood Watch may be extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Ogorek
698 
WGUS63 KLOT 260741
FFALOT

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Chicago IL
241 AM CDT Sat Jun 26 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-011-019-
261545-
/O.EXT.KLOT.FF.A.0001.000000T0000Z-210627T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Fowler, Wheaton, Evanston, 
Marseilles, Palatine, Beecher, Gibson City, Dixon, Downers Grove, 
DeKalb, La Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, 
Lombard, Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, 
Manhattan, Lemont, Streator, Oxford, Plano, Channahon, Sycamore, 
Gary, Valparaiso, Bolingbrook, Kankakee, Wilmington, Minooka, 
Ottawa, Morocco, Morris, Oak Lawn, Rensselaer, Peotone, Joliet, 
Paxton, Oak Park, Dwight, Cicero, Park Forest, Elgin, Des Plaines, 
Orland Park, Mokena, Oswego, Oak Forest, Plainfield, Yorkville, 
Bradley, Coal City, Crete, Fairbury, DeMotte, Naperville, and 
Schaumburg
241 AM CDT Sat Jun 26 2021 /341 AM EDT Sat Jun 26 2021/

...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SUNDAY MORNING...

The Flash Flood Watch is now in effect for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Central Cook, De Kalb, DuPage, 
  Eastern Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
  Salle, Lee, Livingston, Northern Cook, Northern Will, Southern 
  Cook and Southern Will. In northwest Indiana, Benton, Jasper, Lake 
  IN, Newton and Porter.

* Through Sunday morning

* Showers and thunderstorms with torrential downpours are expected 
  throughout the next 24 hours, especially along and southeast of 
  Interstate 55. Considering many areas have received one to four 
  inches of rain over the past 48 hours, additional rain will likely 
  lead to runoff and flash flooding. As such, the Flash Flood Watch 
  has been extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Borchardt
694 
WGUS63 KLOT 261935
FFALOT

Flood Watch
National Weather Service Chicago IL
235 PM CDT Sat Jun 26 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-011-019-
270345-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210627T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Fowler, Wheaton, Evanston, 
Marseilles, Palatine, Beecher, Gibson City, Dixon, Downers Grove, 
DeKalb, La Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, 
Lombard, Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, 
Manhattan, Lemont, Streator, Oxford, Plano, Channahon, Sycamore, 
Gary, Valparaiso, Bolingbrook, Kankakee, Wilmington, Minooka, 
Ottawa, Morocco, Morris, Oak Lawn, Rensselaer, Peotone, Joliet, 
Paxton, Oak Park, Dwight, Cicero, Park Forest, Elgin, Des Plaines, 
Orland Park, Mokena, Oswego, Oak Forest, Plainfield, Yorkville, 
Bradley, Coal City, Crete, Fairbury, DeMotte, Naperville, and 
Schaumburg
235 PM CDT Sat Jun 26 2021 /335 PM EDT Sat Jun 26 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SUNDAY MORNING...

The Flash Flood Watch continues for

* Portions of Illinois and northwest Indiana, including the 
  following areas, in Illinois, Central Cook, De Kalb, DuPage, 
  Eastern Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
  Salle, Lee, Livingston, Northern Cook, Northern Will, Southern 
  Cook and Southern Will. In northwest Indiana, Benton, Jasper, Lake 
  IN, Newton and Porter.

* Through Sunday morning

* Showers and thunderstorms with torrential downpours are expected 
  through tonight, especially along and southeast of Interstate 55. 
  Considering many areas have received one to four inches of rain 
  over the past 48 hours, additional rain will likely lead to runoff 
  and flash flooding. As such, the Flash Flood Watch has been 
  extended.

* Flooding of low-lying areas including farm fields, ditches, and 
  roadways is possible. Additionally, rises in water levels in 
  rivers and streams are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

MDB
558 
WGUS63 KLOT 270102
FFALOT

Flood Watch
National Weather Service Chicago IL
802 PM CDT Sat Jun 26 2021

ILZ010>013-019>021-023-032-033-039-103>108-INZ001-002-010-270215-
/O.CAN.KLOT.FF.A.0001.000000T0000Z-210627T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of La Grange, Carol Stream, Gilman, Kentland, 
Calumet City, Chicago, Portage, Wheaton, Evanston, Marseilles, 
Palatine, Beecher, Gibson City, Dixon, Downers Grove, DeKalb, La 
Salle, Bourbonnais, Chesterton, Merrillville, Northbrook, Lombard, 
Watseka, Pontiac, Roselawn, Mendota, Aurora, Hammond, Manhattan, 
Lemont, Streator, Plano, Channahon, Sycamore, Gary, Valparaiso, 
Bolingbrook, Kankakee, Wilmington, Minooka, Ottawa, Morocco, Morris, 
Oak Lawn, Peotone, Joliet, Paxton, Oak Park, Dwight, Cicero, Park 
Forest, Elgin, Des Plaines, Orland Park, Mokena, Oswego, Oak Forest, 
Plainfield, Yorkville, Bradley, Coal City, Crete, Fairbury, 
Naperville, and Schaumburg
802 PM CDT Sat Jun 26 2021

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of Illinois and northwest 
Indiana, including the following areas, in Illinois, Cook, De Kalb, 
DuPage, Will, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La 
Salle, Lee, and Livingston, and in northwest Indiana, Lake, Newton 
and Porter has been cancelled.

While flooding is ongoing from thunderstorms today across portions 
of the area, renewed or additional flash flooding is not expected 
tonight with little to no additional rain forecast. Therefore, the 
Flash Flood Watch is cancelled.

$$

INZ011-019-270915-
/O.CON.KLOT.FF.A.0001.000000T0000Z-210627T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jasper-Benton-
Including the cities of Oxford, Rensselaer, DeMotte, and Fowler
802 PM CDT Sat Jun 26 2021 /902 PM EDT Sat Jun 26 2021/

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT/8 AM EDT/ 
SUNDAY...

The Flash Flood Watch continues for

* A portion of northwest Indiana, including the following areas, 
  Benton and Jasper.

* Until 7 AM CDT/8 AM EDT/ Sunday

* Showers and thunderstorms with torrential downpours may continue 
  to affect the area this evening and potentially produce localized 
  flooding.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means rapid-onset flooding is possible, but not 
yet certain, based upon the latest forecasts. Flash flooding is a 
dangerous situation. Persons with interests along area rivers, 
creeks, and other waterways should monitor the latest forecasts and 
be prepared to take action should flooding develop.

&&

$$

Kluber
952 
WGUS63 KLOT 270140
FFALOT

Flood Watch
National Weather Service Chicago IL
840 PM CDT Sat Jun 26 2021

INZ011-019-270245-
/O.CAN.KLOT.FF.A.0001.000000T0000Z-210627T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jasper-Benton-
Including the cities of Oxford, Rensselaer, DeMotte, and Fowler
840 PM CDT Sat Jun 26 2021 /940 PM EDT Sat Jun 26 2021/

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for Benton and Jasper counties has been 
cancelled.

Renewed or additional flash flooding is not expected 
tonight with little to no additional rain forecast. Therefore, the 
Flash Flood Watch is cancelled.

$$

Kluber

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 24, 2:34 PM EDT, 45 minutes earlier.

Area forecast discussion, Jun 24, 2:34 PM EDT, 45 minutes before
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
134 PM CDT Thu Jun 24 2021

.UPDATE...
1201 PM CDT

Scattered showers and thunderstorms continue to develop along and
just east of the I-55 corridor late this morning. This activity
is occurring within an area of enhanced lower-level warm air
advection in association with an approaching MCV centered just
north of MLI. Very heavy rainfall is the primary concern with
this area of storms, with amounts of 1-2 inches falling per hour.
We recently issued a flood advisory for much of this area south of
the metro to highlight this threat, but we will have to keep an
eye on this activity as it continues to develop northward over
southern parts of the metro. Expect this activity to continue into
this afternoon as it gradually shifts eastward into northwestern
IN.

Additional showers and some embedded storms will also be possible
this afternoon to the north and west of the main corridor of
ongoing storms as the aforementioned MCV north of MLI shifts
eastward across northern IL.

Our next concern comes with the potential for another period of
heavy rain producing storms developing into the area later this
evening and overnight. We will assess the need for a flood watch
for parts of the area for the afternoon package.

KJB

&&

.SHORT TERM...
320 AM CDT

Through Friday...

One of the common mid-summer forecast challenges has taken up shop
the remainder of the week, and that is timing multiple rounds of
showers and storms with successive influences (domino effect) on
where next convective rounds will be. There will be periods of
regional heavy rain, with the first likely tonight into Friday
morning. Will continue messaging this in graphic(s) and a
Hydrologic Outlook. A Flood Watch may be needed later today or
tonight for cumulative effects by Friday and Saturday.

Large scale GOES-16 water vapor imagery this morning depicts a
slightly dampening ridge over the country's midsection as a strong
upper jet streak races eastward across the Canadian border. A
slow-moving surface cold front from Minnesota into eastern/central
Nebraska early this morning is serving as a focus for scattered
convective clusters in Minnesota and northwest Wisconsin. This is
one area we are watching as well as the MCS near Omaha as of 300
A.M. It is likely the MCS will progress southeast, however a low
amplitude convectively-enhanced perturbation seen on satellite and
regional radar mosaic is emanating eastward and is also key.

Both of these aforementioned features and their forcing for
ascent and foci for convergence should increase the shower and
thunderstorm potential from northwest to southeast over the area
late this morning into afternoon. Some of the expected convective
clusters in Wisconsin later this morning will likely have cold
pool/outflow pushes to help them reach the Illinois state line
area late this morning, though there is uncertainty how filled in
this activity will be as it further outpaces the front. Several
CAM solutions -- which need to be used with multiple grains of
salt in this pattern -- show the activity to be fairly narrow (1-2
hours in duration) as it moves into the area from Wisconsin,
potentially resulting in the northern CWA seeing chances drop off
for a period mid-late afternoon. Confidence on this is presently
low. Other scattered activity ahead of the short wave (related to
moistening isentropic ascent) should progress east-southeast over
the central and southern CWA this afternoon. Typically with such
a feature arriving during peak heating, we are more concerned for
severe potential, but surface and mixed layer instability will be
still limited. It's possible a few storms feed on outflows and
gradually increasing MUCAPE (>1,500 J/kg especially in north
central Illinois) to become temporarily near or marginally
severe.

Moving forward into tonight, that "domino effect" of prior and
ongoing rounds of convection starts to grow and making it more
challenging. However, synoptically we are under a right entrance
region of the northern stream jet and a stout 35-40 kt
southwesterly low-level jet will be nosing into northern Illinois
this evening. One potential issue is robust convection on a
warm front extending into northern Missouri may rob some moisture
transport. But think there is still plenty going for lift and
moisture (PWATs at or above 1.9 inches) for a growing footprint of
showers and convection in the CWA this evening, probably more
favored in north central Illinois at first. If this does
materialize, an expansion east into the overnight is likely before
a gradual shift and fade eastward Friday morning. The ECMWF
overall supports this solution, with over half of its ensemble
members producing over two inches by Friday morning across parts
o northern Illinois. While the NCEP models develop more of an MCS
from the IA/MO border eastward into the area late, they also
produce large QPF values. So while confidence on exact morphology
is low, did boost PoPs and rainfall amounts given the signal.
Periods of heavy rainfall rates are favored given warm rain
process ingredients, such as 700 mb Tds of a beefy 5C, and these
rates will be sharply increased within convection which there
looks to be plenty of. There is uncertainty on how much of the CWA
gets into a heavy rain duration a large part of the night, but
where that occurs there could be a mesoscale area of 3 inches of
rain by the end of Friday morning. Will again have to watch for
moisture robbing effect of any widespread convection, and our
northern CWA is most susceptible to this and potentially missing
some of the bigger QPF, but no clear cut signal at all for that at
this time.

There is some agreement on a break midday and/or afternoon Friday
for at least northern areas, but again that can easily be
modulated the opposite direction by just one little perturbation
that is too far out to resolve at this time. The surface cold
front is forecast to be near the Illinois/Wisconsin border Friday,
and depending on convective effects may make it down the lake
turning winds onshore and supporting some cooler temperatures
than forecast for Chicago on Friday afternoon.

MTF

&&

.LONG TERM...

Friday night through Wednesday...

243 AM...Primary forecast concern and challenge remains heavy
rain potential, rain amounts and severe potential through the
weekend.

Not much change in the overall expectations for Friday night
through Sunday morning. A frontal boundary in the area or nearby
and rounds of convection, each one dependent on the previous and
other ongoing rounds. Dewpoints remain in the lower 70s, possibly
pooling into the mid 70s along any stronger frontal boundary and
precipitable water values of 2 to 2.5 inches are still expected.
All of this supports the potential for torrential rainfall across
the entire area. Unfortunately, timing and location remains
uncertain and as a result, fairly high pops are warranted for many
time periods. WPC will be highlighting all of the area for a
slight risk for flooding for both Friday and Saturday with a
moderate risk centered across central IL Friday, clipping part of
the southern cwa. Rainfall amounts Friday night through Sunday
morning from the models show a large swath of 3-6 inches across
central IL with 1-3 inches across the northern cwa and these
amounts would be in addition to what falls through Friday
afternoon. Thus, these outlooks look on track and added locally
heavy rainfall through Sunday morning. The severe potential is
looking more limited and will also depend on the position of
various boundaries.

From Sunday onward, trends are fairly uncertain. A large upper
trough will remain from the northern Plains across the Great Lakes
region with various disturbances moving across the region. Models
continue to close off an upper low over the Plains by Tuesday and
now are closing off a second upper low by the end of next week,
somewhere from the northern Plains to the western Great Lakes.
Chance pops warranted for the entire extended period. cms

&&

.AVIATION...
For the 18Z TAFs...

Aviation Weather Concerns
* Widespread thunderstorms this afternoon, especially south of I-80
* Continued gusty winds this afternoon
* MVFR ceilings developing overnight, with possible IFR ceilings
* Threat of heavy rain and isolated thunderstorms Friday

Showers and thunderstorms continue to move through northeastern
IL/northwestern IN, mainly southeast of I-55. Another area of
showers is moving in from the west. These will initially remain
primarily showers, but isolated thunderstorms will form later this
afternoon with these showers. The area is expected to continue to
move east-northeast. Winds will be from the south with non-
thunderstorms gusts in the lower 20 kt range, although occasional
gusts in the upper 20 kt is possible. Cloud ceilings are remaining
VFR between 3500 to 4000 ft, with occasional MVFR CIGs in
showers/storms. This overall area of showers/storms will move east
of Lake Michigan by late afternoon.

Models indicate that ceilings will lower tonight to MVFR at around
1500 ft working west to east after sunset as winds become slightly
weaker, but remaining from the south. Isolated showers may pop up
over north IL late evening, while isolated thunderstorms are
possible with these showers after midnight. Confidence in location
of these showers and storms is low, but I expect most of northern IL
/ northwestern IN will see showers/thunderstorms, especially south
of I-90. MVFR ceilings are expected to remain throughout Thursday
night into Friday morning and early afternoon.

Showers/storms will shift slightly south of I-88 late Friday morning
/ early afternoon before shifting north again by late Friday
afternoon. Ceilings are expected to rise back to VFR by Friday mid-
afternoon. Winds will be gusty once again, but not as gusty as
today, with gusts at or below 20 kt expected. The rain associated
with these storms may be heavy and steady throughout Friday,
restricting visibilities to MVFR conditions. These heavy showers and
storms are expected to continue into Friday evening.

BKL

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory...nearshore waters
     until 7 PM Thursday.

&&

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, Jun 24, 1:57 PM EDT, 1 hour 22 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1257 PM CDT Thu Jun 24 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-251800-
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-
1257 PM CDT Thu Jun 24 2021 /157 PM EDT Thu Jun 24 2021/

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...

  Significant Thunderstorm Risk...with an associated:
     Limited hail risk...up to penny size.
     Limited damaging wind risk...up to 60 mph.
  Limited Flooding Risk.

DISCUSSION...

Scattered thunderstorms are expected this afternoon across the
area, followed by more widespread thunderstorms after dark. A few
storms could approach severe limits. Heavy rainfall is likely with
storms. Totals of two to four inches are possible in some places by
Friday morning. This heavy rain may thus result in some localized
flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Limited Severe Thunderstorm Risk.
  Significant Flooding Risk.
Saturday...
  Limited Severe Thunderstorm Risk.
  Elevated Flooding Risk.
  Limited Non Thunderstorm Wind Risk.
Sunday through Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION:

Additional rounds of thunderstorms will affect the region Friday
into the weekend. A flooding risk may increase into Friday due to
cumulative rainfall, with some locations forecast to receive over
five inches of rain.

A period or two within that may support isolated strong to severe
thunderstorms as well.

.SPOTTER INFORMATION STATEMENT...

 Spotter activation is not anticipated today.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 15 to 25 mph.

LMZ740>745-251800-
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-
1257 PM CDT Thu Jun 24 2021

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...

  Hazardous conditions for small craft.
  Significant Thunderstorm Risk...with an associated:
     Limited hail risk...up to penny size.
     Limited thunderstorm wind gust risk...up to 50 knots.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday and Saturday...
  Limited Severe Thunderstorm Risk.
Sunday through Wednesday...
  Limited Thunderstorm Risk.

KJB

Visit us at http://weather.gov/chicago

Follow us on Facebook, Twitter, and Youtube at:
www.facebook.com/nwschicago
www.twitter.com/nwschicago
www.youtube.com/nwschicago

In the hours before

Special weather statement, Jun 24, 10:50 AM EDT, 4 hours 29 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
950 AM CDT Thu Jun 24 2021

ILZ032-241515-
Livingston IL-
950 AM CDT Thu Jun 24 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LIVINGSTON COUNTY
UNTIL 1015 AM CDT...

At 950 AM CDT, Doppler radar was tracking a strong thunderstorm near
Odell, or near Dwight, moving northeast at 30 mph.

Penny size hail will be possible with this storm.

Locations impacted include...
Dwight, Odell, Campus, Reddick and Emington.

Including the following interstate...
 I-55 between mile markers 209 and 218.

LAT...LON 4104 8857 4111 8847 4111 8825 4097 8825
      4089 8847
TIME...MOT...LOC 1450Z 230DEG 25KT 4101 8846

Birk
Special weather statement, Jun 24, 11:28 AM EDT, 3 hours 51 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
1028 AM CDT Thu Jun 24 2021

ILZ021-023-032-039-107-241545-
Grundy IL-Livingston IL-Southern Will IL-Kankakee IL-Ford IL-
1028 AM CDT Thu Jun 24 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LIVINGSTON...
SOUTHWESTERN WILL...SOUTHEASTERN GRUNDY...SOUTHWESTERN KANKAKEE AND
NORTH CENTRAL FORD COUNTIES UNTIL 1045 AM CDT...

At 1027 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Gardner to 6 miles south of Braceville to
near Cullom. Movement was northeast at 20 mph.

Penny size hail and winds to 45 mph will be possible with these
storms.

Locations impacted include...
Braidwood, Wilmington, Herscher, Gardner, Lakewood Shores,
Braceville, Cullom, Saunemin, Essex, South Wilmington, Godley,
Buckingham, Cabery, Kempton, Campus, Reddick, Emington, East
Brooklyn, Stelle and Union Hill.

Including the following interstate...
 I-55 between mile markers 224 and 232.

LAT...LON 4079 8844 4120 8835 4134 8808 4118 8808
      4079 8817
TIME...MOT...LOC 1527Z 247DEG 17KT 4118 8826 4114 8824 4086 8830

Birk
Local storm report, Jun 24, 1:31 PM EDT, 1 hour 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1231 PM CDT THU JUN 24 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1149 AM     HEAVY RAIN       2 SE EMINGTON           40.95N 88.32W
06/24/2021  M3.39 INCH       LIVINGSTON         IL   PUBLIC

            PRIVATE WEATHER STATION REPORTS 3.39 INCHES
            TOTAL RAINFALL OVER 1 HOUR AND 45 MINUTES.
            ALMOST 2.5 INCHES OCCURRED IN 1 HOUR.

&&

WSL
Local storm report, Jun 24, 1:32 PM EDT, 1 hour 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1232 PM CDT THU JUN 24 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1204 PM     HEAVY RAIN       2 SE SAUNEMIN           40.87N 88.38W
06/24/2021  M2.26 INCH       LIVINGSTON         IL   PUBLIC

            PRIVATE WEATHER STATION REPORTS 2.26 INCHES
            TOTAL RAINFALL OVER 1 HOUR 45 MINUTES.

&&

WSL
Local storm report, Jun 24, 1:46 PM EDT, 1 hour 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1246 PM CDT THU JUN 24 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1240 PM     FLOOD            4 N CHATSWORTH          40.80N 88.30W
06/24/2021                   LIVINGSTON         IL   CO-OP OBSERVER

            WATER OVER ROADWAY NORTH OF CHATSWORTH. CAR
            IN THE DITCH.

&&

WSL
Local storm report, Jun 24, 2:06 PM EDT, 1 hour 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
106 PM CDT THU JUN 24 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1255 PM     FLOOD            3 NE SAUNEMIN           40.92N 88.36W
06/24/2021                   LIVINGSTON         IL   911 CALL CENTER

            VCOM REPORTS ROADWAY FLOODING OF N 3000 ROAD
            NEAR 2000 ROAD. VEHICLE IN THE DITCH. OTHER
            ROADWAYS POTENTIALLY FLOODED IN THIS PORTION
            OF THE COUNTY.

&&

WSL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 24, 10:50 AM EDTSpecial Weather StatementLOTLivingston25 min
Jun 24, 11:28 AM EDTSpecial Weather StatementLOTGrundy17 min
Jun 24, 12:43 PM EDTAreal Flood AdvisoryLOTFord, Grundy, Iroquois, Kankakee, Livingston, Will4 hr

Nearby

Flash Flood Watches in Illinois, 2021Flash Flood Watches in Indiana, 2021Every flash flood watch in 2021

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.