Weather Alerts For Sleepy Hollow, IL

# HEADLINE -------------------- FLOOD WARNING IN EFFECT UNTIL 11 AM CDT SUNDAY REPLACES FLASH FLOOD WARNINGS PREVIOUSLY IN EFFECT # DETAILS -------------------- WHAT Flooding caused by excessive rainfall continues. WHERE Portions of north central and northeast Illinois, including the following counties, in north central Illinois, De Kalb. In northeast Illinois, Cook, DuPage and Kane. WHEN Until 1100 AM CDT Sunday. IMPACTS Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. High water likely may recede slowly from flooded areas. ADDITIONAL DETAILS - At 644 PM CDT, local law enforcement, emergency dispatch centers, and highway departments reported flooding across the area. Between 1 and 2 inches of rain have fallen from earlier thunderstorms. While heavy rainfall has ended, some flooding will be slow to recede. Some streams may continue to rise over the next few hours. - SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE - Chicago, Aurora, Naperville, Elgin, Cicero, Arlington Heights, Schaumburg, Palatine, Des Plaines, Berwyn, Mount Prospect, Wheaton, Hoffman Estates, Oak Park, Downers Grove, Elmhurst, Lombard, Bartlett, Ohare Airport and Streamwood. - http://www.weather.gov/safety/flood ISSUED AT Saturday, July 4, 2026 at 6:48 PM CDT ISSUED BY National Weather Service Chicago IL HEADER BULLETIN - IMMEDIATE BROADCAST REQUESTED | Flood Warning # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- A Flood Warning means flooding is imminent or may already be occurring. Persons along rivers, creeks, and other waterways should take immediate precautions to protect life and property. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. # AREAS AFFECTED -------------------- Cook IL, De Kalb IL, DuPage IL, Kane IL

# SUMMARY -------------------- The National Weather Service in Chicago has issued a - Flash Flood Warning for... Northwestern Cook County in northeastern Illinois... Northern DuPage County in northeastern Illinois... Northeastern Kane County in northeastern Illinois... - Until 900 PM CDT. - At 307 PM CDT, Doppler radar and automated rain gauges indicated thunderstorms producing torrential rainfall across the warned area. Between 2 and 3 inches of rain have fallen in portions of far northeastern Kane County. The expected rainfall rate is up to 2 inches in 1 hour. Additional rainfall amounts of 1 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. # DETAILS -------------------- HAZARD Flash flooding. SOURCE Radar and automated gauges. IMPACT Rapid-onset flooding of creeks, streams, drainage ditches, streets, underpasses, low-lying areas, and other poor drainage areas. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE Chicago, Elgin, Arlington Heights, Schaumburg, Palatine, Des Plaines, Mount Prospect, Wheaton, Hoffman Estates, Elmhurst, Lombard, Bartlett, Streamwood, Carol Stream, Hanover Park, Carpentersville, Addison, Glendale Heights, Elk Grove Village and St. Charles. ISSUED AT Saturday, July 4, 2026 at 3:07 PM CDT ISSUED BY National Weather Service Chicago IL HEADER BULLETIN - EAS ACTIVATION REQUESTED | Flash Flood Warning # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- A Flash Flood Warning means rapid-onset flooding is imminent or may already be occurring. Persons along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

There is a Marginal Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE SOUTHERN PLAINS AND MID ATLANTIC THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF THE CENTRAL HIGH PLAINS AND FROM THE SOUTHERN HIGH PLAINS TO SOUTHERN NEW ENGLAND SUMMARY Clusters of storms will continue to move across parts of the Allegheny Plateau into the Mid-Atlantic, with potential for numerous damaging wind gusts. Additional severe thunderstorms are still expected across the Great Plains this afternoon and evening, posing a risk for severe wind gusts and large hail. 20Z Update A cold-pool-driven MCS, with a history of measured 50+ kt gusts and wind damage, continues to rapidly propagate eastward across central MO. While deep-layer shear is quite modest over the Ozarks, a pronounced baroclinic boundary is draped across central MO into the St. Louis Metropolitan area. The MCS has likely maintained its intensity thus far by riding this boundary and ingesting some vorticity for bookend vortex and rear-inflow jet maintenance. It is unclear how long this MCS will remain strong/organized given the lack of ambient deep-layer shear. However. surface temperatures on the warm side of the boundary exceeding 90 F, amid mid 70s F dewpoints, is yielding a gradient of 2500-4500 J/kg SBCAPE, which should support some severe gust threat for this MCS for at least the next few hours. As such, 30 percent wind probabilities have been added ahead of the MCS. Guidance consensus, including early depictions from WoFS output, suggests that an MCS will quickly surge southeastward across portions of the southern Plains after initiating along the KS/OK border late this afternoon. The farther southeast initiation (given the current position of the surface outflow boundary left behind from the previous MCS), and southeastward surging potential, it appears that the greatest wind threat will exist into east-central OK. 30 percent/CIG1 wind probabilities have been extended into this region. Five percent hail probabilities have been added across portions of the lower Hudson Valley. Here, MRMS mosaic MESH data suggests that marginally severe hail may already be falling with the more robust storms over northern PA. Furthermore, stronger mid-level flow is grazing the lower Hudson Valley, contributing to 30-40 kts of effective bulk shear amid 1000+ J/kg MLCAPE, which should be adequate to support a continued hail threat. Otherwise, the previous forecast remains on track, including the potential for numerous damaging to occasionally severe gusts expected across portions of the Mid Atlantic into southern New England through the afternoon and evening hours. Mostly minor adjustments have been made to the remainder of the outlook to account for guidance consensus and observations.