@NWSChicago

Official X account for the National Weather Service Chicago. Details: https://nitter.cf/t.co/WJlrehRT4n

 Romeoville, IL
weather.gov/chicago
Joined July 2012
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Here is a list of some of the 48-hour rainfall reports we have received ending at 1 PM CDT this afternoon: partnerservices.nws.noaa.gov… #ILwx #INwx
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Light showers or drizzle will continue at times into Tuesday before drier conditions prevail later in the week. Expect seasonably cool conditions through the week.
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Outlook for the Week. Sub Headline: Cool and damp to start, then turning drier through the week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Sunday, September 20, 2026 1:00 PM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Outlook for the Week. Sub Headline: Cool and damp to start, then turning drier through the week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Sunday, September 20, 2026 1:00 PM CDT

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A Flood Warning has been issued for portions of the Green River in Lee County until 7:15 PM CDT this evening. Ongoing rainfall and run off from recent rains will allow the river to rise in spots and may result in localized river flooding. Stay alert if in the warned area. #ILwx
Map showing a Flood Warning issued for portions of the Green River in Lee County until 7:15 PM CDT this evening (9/20/2026).

ALT Map showing a Flood Warning issued for portions of the Green River in Lee County until 7:15 PM CDT this evening (9/20/2026).

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Rain chances will persist through Monday, though threat of heavy rainfall should end by early this afternoon. Dry, but cooler than average weather can be expected by mid-week. #ILwx #INwx
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Turning drier by mid-week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Sunday, September 20, 2026 2:30 AM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Turning drier by mid-week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Sunday, September 20, 2026 2:30 AM CDT

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Aviso de Inundación Repentina incluye Sandwich IL, Mendota IL, Lake Holiday IL hasta las 8:00 AM CDT
Este gráfico muestra la localización en el mapa de un aviso de inundación repentina. El aviso estará en efecto hasta las 8:00 AM CDT. El aviso incluye a Sandwich IL, Mendota IL, Lake Holiday IL. El aviso incluye el sur del condado de Kalb en el norte centro de Illinois, el norte del condado de La Salle en el norte centro de Illinois y el condado de Lee en el norte centro de Illinois. ¡Evite caminar o manejar su vehículo a través de áreas inundadas! ¡Muévase a un terreno más alto inmediatamente! Hay 43,246 personas bajo este aviso incluyendo 35 escuelas y 2 hospitales.

ALT Este gráfico muestra la localización en el mapa de un aviso de inundación repentina. El aviso estará en efecto hasta las 8:00 AM CDT. El aviso incluye a Sandwich IL, Mendota IL, Lake Holiday IL. El aviso incluye el sur del condado de Kalb en el norte centro de Illinois, el norte del condado de La Salle en el norte centro de Illinois y el condado de Lee en el norte centro de Illinois. ¡Evite caminar o manejar su vehículo a través de áreas inundadas! ¡Muévase a un terreno más alto inmediatamente! Hay 43,246 personas bajo este aviso incluyendo 35 escuelas y 2 hospitales.

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Flash Flood Warning including Sandwich IL, Mendota IL and Lake Holiday IL until 8:00 AM CDT
This graphic displays a flash flood warning plotted on a map. The warning is in effect until 8:00 AM CDT. The warning includes Sandwich IL, Mendota IL and Lake Holiday IL. This warning is for Southern De Kalb County in north central Illinois, Northern La Salle County in north central Illinois and Lee County in north central Illinois. Avoid walking or driving through flood waters! Move immediately to higher ground! There are 43,246 people in the warning along with 35 schools and 2 hospitals.

ALT This graphic displays a flash flood warning plotted on a map. The warning is in effect until 8:00 AM CDT. The warning includes Sandwich IL, Mendota IL and Lake Holiday IL. This warning is for Southern De Kalb County in north central Illinois, Northern La Salle County in north central Illinois and Lee County in north central Illinois. Avoid walking or driving through flood waters! Move immediately to higher ground! There are 43,246 people in the warning along with 35 schools and 2 hospitals.

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A corridor of torrential rainfall and t-storms is expected to set up near and along the I-88 and I-80 corridors overnight. Flash flooding (and potentially significant flash flooding) may occur across these areas before the heaviest rainfall tapers off after daybreak. #ILwx #INwx
Headline: Flash Flooding Threat Overnight. Sub Headline: Greatest likelihood for flooding along/near the I-88 and I-80 corridors. What To Expect: Torrential Rainfall from Showers and Scattered T-storms. Through ~7 AM CDT. Rain and flooding impacts may persist beyond this time. Main Hazard (Primarily in Dark Green Shaded Area in Graphic): Flash Flooding, Potentially Significant. Numerous flooded roads, overflowing creeks/streams, and flooded basements. All thunderstorms will produce: Torrential Rainfall. May cause flooding of roads, low-lying areas, basements, and cause stream/creek rises. Lightning Strikes. What To Do: NEVER drive or walk across flooded roads! Report flooding to us or law enforcement. Graphic Created: Saturday, September 19, 2026 11:30 PM CDT

ALT Headline: Flash Flooding Threat Overnight. Sub Headline: Greatest likelihood for flooding along/near the I-88 and I-80 corridors. What To Expect: Torrential Rainfall from Showers and Scattered T-storms. Through ~7 AM CDT. Rain and flooding impacts may persist beyond this time. Main Hazard (Primarily in Dark Green Shaded Area in Graphic): Flash Flooding, Potentially Significant. Numerous flooded roads, overflowing creeks/streams, and flooded basements. All thunderstorms will produce: Torrential Rainfall. May cause flooding of roads, low-lying areas, basements, and cause stream/creek rises. Lightning Strikes. What To Do: NEVER drive or walk across flooded roads! Report flooding to us or law enforcement. Graphic Created: Saturday, September 19, 2026 11:30 PM CDT

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(🧵1/4) Showers and storms with torrential downpours are expected to develop again across northern IL this evening and continue into Sun AM. This rain will fall over already saturated ground from the past day, increasing the risk for localized flooding. #ILwx #INwx
Headline: Threat for Flash Flooding Tonight. Sub Headline: Main time window for flash flooding late this evening through into Sunday morning. What To Expect. Another round of torrential rainfall. May flood roads, low-lying areas, fields, and basements, and cause rapid stream/creek rises. When: Favored Timing of Highest Rainfall Rates. ~7 PM this evening - 6 AM CDT Sunday. Where: Areawide. Highest rainfall amounts and greatest flooding impacts favored across northern Illinois and far northwest Indiana, which aligns with much of the area that experienced heavy rain over the past day. What To Do. NEVER drive or walk across flooded roads! Move valuables from flood-prone areas, such as basements and outdoor areas with poor drainage. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

ALT Headline: Threat for Flash Flooding Tonight. Sub Headline: Main time window for flash flooding late this evening through into Sunday morning. What To Expect. Another round of torrential rainfall. May flood roads, low-lying areas, fields, and basements, and cause rapid stream/creek rises. When: Favored Timing of Highest Rainfall Rates. ~7 PM this evening - 6 AM CDT Sunday. Where: Areawide. Highest rainfall amounts and greatest flooding impacts favored across northern Illinois and far northwest Indiana, which aligns with much of the area that experienced heavy rain over the past day. What To Do. NEVER drive or walk across flooded roads! Move valuables from flood-prone areas, such as basements and outdoor areas with poor drainage. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

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(🧵3/4) Here is a look at the general rainfall trends through tonight. The greatest heavy rain and flooding threat is late this evening through early Sunday morning. #ILwx #INwx
Headline: General Precipitation Trends. Sub Headline: Thunderstorm coverage increases this evening and overnight. Rest of this afternoon: Highest shower coverage near and north of I-80. Lightning threat 10-15% chance, flooding threat low. 8 PM to 11 PM: Increasing shower and thunderstorm coverage near and north of the Kankakee River Valley. Flooding threat level 1-2 of 4. Overnight: Widespread showers and embedded thunderstorms with locally torrential rainfall. Flash flooding threat highest near and north of I-80. Flooding threat level 2-3 of 4. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

ALT Headline: General Precipitation Trends. Sub Headline: Thunderstorm coverage increases this evening and overnight. Rest of this afternoon: Highest shower coverage near and north of I-80. Lightning threat 10-15% chance, flooding threat low. 8 PM to 11 PM: Increasing shower and thunderstorm coverage near and north of the Kankakee River Valley. Flooding threat level 1-2 of 4. Overnight: Widespread showers and embedded thunderstorms with locally torrential rainfall. Flash flooding threat highest near and north of I-80. Flooding threat level 2-3 of 4. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

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(🧵4/4) While rain chances will persist through Monday, drier conditions are forecast towards the middle of next week. Temperatures will also become cooler next week as well. #ILwx #INwx
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Soggy weather through Monday before turning drier and cooler. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Soggy weather through Monday before turning drier and cooler. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Saturday, September 19, 2026 2:27 PM CDT

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Widespread rain and scattered storms will continue through the midday. While the greatest lightning threat will be near and south of I-80, soaking to torrential downpours are expected that could result in localized ponding. Go indoors if you hear thunder! #ILwx #INwx
Headline: Showers and Thunderstorms this Morning. Sub Headline: Graphic valid through 12 PM CDT 9/19/2026. What To Expect. Showers and scattered thunderstorms. Primary hazards north of I-80: Soaking downpours that may lead to slowed driving and localized ponding of low-lying areas. Occasional lightning strikes. Primary hazards south of I-80: Frequent lightning strikes. Torrential rainfall that may lead to localized flooding and river rises. What to Do: Move indoors if you hear thunder. Use caution when driving in heavy rain. Graphic Created: Saturday, September 19, 2026 8:51 AM CDT

ALT Headline: Showers and Thunderstorms this Morning. Sub Headline: Graphic valid through 12 PM CDT 9/19/2026. What To Expect. Showers and scattered thunderstorms. Primary hazards north of I-80: Soaking downpours that may lead to slowed driving and localized ponding of low-lying areas. Occasional lightning strikes. Primary hazards south of I-80: Frequent lightning strikes. Torrential rainfall that may lead to localized flooding and river rises. What to Do: Move indoors if you hear thunder. Use caution when driving in heavy rain. Graphic Created: Saturday, September 19, 2026 8:51 AM CDT

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Waves of showers and thunderstorms, capable of producing locally heavy rainfall, are expected through Sunday night. Rain chances then gradually diminish early next week, with cooler than average temperatures. #ILWX #INWX
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Waves of heavy rainfall this weekend with cooler temperatures next week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Saturday, September 19, 2026 4:34 AM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Five Day Outlook. Sub Headline: Waves of heavy rainfall this weekend with cooler temperatures next week. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Saturday, September 19, 2026 4:34 AM CDT

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Waves of showers and thunderstorms this weekend will likely result in rises on area rivers and possibly some localized river flooding. Make sure you stay updated on the latest forecast, especially if you live near a river! #ILWX #INWX
Headline: River Flood Threat into Next Week. Sub Headline: A large footprint of high rainfall totals will lead to rises in area river levels. What To Expect. Multiple rounds of showers and storms are expected to result in a large footprint of rainfall across northeastern Iowa, southern Wisconsin, and northern Illinois this weekend. Rises in river levels are likely which may persist into next week, including along the Rock, Fox, DuPage, Des Plaines, and Illinois Rivers. There is at least a 10% chance that points along several rivers reach moderate flood stage next week. What To Do. Those along rivers should prepare for potential flooding. Check river observations and forecasts at water.noaa.gov. Graphic Created: Saturday, September 19, 2026 4:26 AM CDT

ALT Headline: River Flood Threat into Next Week. Sub Headline: A large footprint of high rainfall totals will lead to rises in area river levels. What To Expect. Multiple rounds of showers and storms are expected to result in a large footprint of rainfall across northeastern Iowa, southern Wisconsin, and northern Illinois this weekend. Rises in river levels are likely which may persist into next week, including along the Rock, Fox, DuPage, Des Plaines, and Illinois Rivers. There is at least a 10% chance that points along several rivers reach moderate flood stage next week. What To Do. Those along rivers should prepare for potential flooding. Check river observations and forecasts at water.noaa.gov. Graphic Created: Saturday, September 19, 2026 4:26 AM CDT

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Waves of showers and storms this weekend will be capable of torrential downpours which may result in localized flooding, especially in poor drainage and low-lying areas. Some uncertainty in the placement of the heaviest rain remains, so stay tuned for updates. #ILwx #INwx
Headline: Threat for Flash Flooding this Weekend. Sub Headline: Primary time window for flash flooding will be this morning and again late this evening and overnight. What To Expect. Repeated rounds of torrential rainfall. May flood roads, low-lying areas, fields, and basements, and cause rapid stream/creek rises. Favored Timing of Highest Rainfall Rates. Round 1: Through 12 PM CDT today Round 2: ~7 PM this evening - 6 AM CDT Sunday Areawide. Highest rainfall amounts and greatest flooding impacts favored near and north of a Dixon to Rensselaer line. What To Do. NEVER drive or walk across flooded roads! Move valuables from flood-prone areas, such as basements and outdoor areas with poor drainage. Graphic Created: Saturday, September 19, 2026 4:18 AM CDT

ALT Headline: Threat for Flash Flooding this Weekend. Sub Headline: Primary time window for flash flooding will be this morning and again late this evening and overnight. What To Expect. Repeated rounds of torrential rainfall. May flood roads, low-lying areas, fields, and basements, and cause rapid stream/creek rises. Favored Timing of Highest Rainfall Rates. Round 1: Through 12 PM CDT today Round 2: ~7 PM this evening - 6 AM CDT Sunday Areawide. Highest rainfall amounts and greatest flooding impacts favored near and north of a Dixon to Rensselaer line. What To Do. NEVER drive or walk across flooded roads! Move valuables from flood-prone areas, such as basements and outdoor areas with poor drainage. Graphic Created: Saturday, September 19, 2026 4:18 AM CDT

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(🧵1/3) Waves of showers and thunderstorms Saturday through Sunday will likely result in rises on area rivers and possibly some localized river flooding. Make sure you stay updated on the latest forecast, especially if you live near a river! #ILwx #INwx
Headline: River Flood Threat into Next Week. Sub Headline: A large footprint of high rainfall totals will lead to rises in area river levels. What to Expect: Multiple waves of storms are expected in the region Saturday into Sunday. A large footprint of rainfall is expected across northeastern Iowa, southern Wisconsin, and northern Illinois into local areal river basins. Rises in river levels are likely that will last into next week, including along the: Rock River. Fox River. DuPage River. Des Plaines River. Illinois River. There is at least a 10% chance that points along several rivers reach moderate flood stage next week. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

ALT Headline: River Flood Threat into Next Week. Sub Headline: A large footprint of high rainfall totals will lead to rises in area river levels. What to Expect: Multiple waves of storms are expected in the region Saturday into Sunday. A large footprint of rainfall is expected across northeastern Iowa, southern Wisconsin, and northern Illinois into local areal river basins. Rises in river levels are likely that will last into next week, including along the: Rock River. Fox River. DuPage River. Des Plaines River. Illinois River. There is at least a 10% chance that points along several rivers reach moderate flood stage next week. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

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(🧵2/3) The waves of showers and storms this weekend will be capable of torrential downpours which may result in localized flooding, especially in poor drainage and low-lying areas. Some uncertainty in the placement of the heaviest rain remains, so stay tuned. #ILwx #INwx
Headline: Threat for Flash Flooding this Weekend. Sub Headline: Primary time window for flash flooding will be Saturday afternoon through early Sunday morning. What to Expect: Repeated rounds of storms over saturated soils will support areas of flash flooding, especially Saturday afternoon through early Sunday morning locally. The greatest threat for flash flooding locally appears to be near the I-88 and I-80 corridors where soaking rain fell earlier this week. Potential Mitigating Scenarios: There are scenarios where each round of storms is further south than the prior round which would lead to a broader, but less focused, corridor of excessive rainfall. Picture a hose with a broader spray setting rather than a focused stream directed at one area. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

ALT Headline: Threat for Flash Flooding this Weekend. Sub Headline: Primary time window for flash flooding will be Saturday afternoon through early Sunday morning. What to Expect: Repeated rounds of storms over saturated soils will support areas of flash flooding, especially Saturday afternoon through early Sunday morning locally. The greatest threat for flash flooding locally appears to be near the I-88 and I-80 corridors where soaking rain fell earlier this week. Potential Mitigating Scenarios: There are scenarios where each round of storms is further south than the prior round which would lead to a broader, but less focused, corridor of excessive rainfall. Picture a hose with a broader spray setting rather than a focused stream directed at one area. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

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(🧵3/3) After a soggy weekend, rain chances are expected to diminish early next week. Temperatures will also become cooler next week with below average readings forecast. #ILwx #INwx
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Stormy Pattern Tonight Through Monday. Sub Headline: Waves of Heavy Rainfall Late Tonight through Sunday Night. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Stormy Pattern Tonight Through Monday. Sub Headline: Waves of Heavy Rainfall Late Tonight through Sunday Night. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Friday, September 18, 2026 2:57 PM CDT

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Periods of showers and thunderstorms, capable of producing locally heavy rainfall, are expected late tonight through Sunday night. Rain chances then gradually diminish early next week, with cooler than average temperatures. #ILwx #INwx
This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Stormy Pattern Tonight Through Monday. Sub Headline: Periods of Heavy Rainfall Possible Late Tonight through Sunday Night. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Friday, September 18, 2026 4:02 AM CDT

ALT This is a multiday forecast graphic for northern Illinois and northwest Indiana. Headline: Stormy Pattern Tonight Through Monday. Sub Headline: Periods of Heavy Rainfall Possible Late Tonight through Sunday Night. Visit weather.gov/Chicago for more forecast details for your location. Graphic Created: Friday, September 18, 2026 4:02 AM CDT

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Rounds of heavy-rain producin showers and thunderstorms are expected late tonight through Sunday night. Successive rounds of heavy rainfall could lead to localized flooding, including flooding of low-lying and poor drainage areas and potential rises on rivers. #ILwx #INwx
Headline: Localized Flooding Possible This Weekend. Sub Headline: Multiple Rounds of Heavy Rain likely from late Tonight through Sunday night. What To Expect. What To Do. Those along rivers should prepare for potential flooding. NEVER drive or walk across flooded roads. Torrential Rainfall. Widespread rainfall amounts 2 to 4 inches by Sunday night are possible, with localized higher amounts. Late Tonight through Sunday night. Along and North of I-80 Corridor. (Darkest Green Area on Map). For highest rainfall amounts through Sunday night. Graphic Created: Friday, September 18, 2026 4:02 AM CDT

ALT Headline: Localized Flooding Possible This Weekend. Sub Headline: Multiple Rounds of Heavy Rain likely from late Tonight through Sunday night. What To Expect. What To Do. Those along rivers should prepare for potential flooding. NEVER drive or walk across flooded roads. Torrential Rainfall. Widespread rainfall amounts 2 to 4 inches by Sunday night are possible, with localized higher amounts. Late Tonight through Sunday night. Along and North of I-80 Corridor. (Darkest Green Area on Map). For highest rainfall amounts through Sunday night. Graphic Created: Friday, September 18, 2026 4:02 AM CDT

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