NWS Chicago
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| NWS Chicago | |
|---|---|
| Agency name | National Weather Service Chicago |
| Abbreviation | NWS Chicago |
| Formed | 1870s (as U.S. Signal Service precursor) |
| Jurisdiction | Northeastern Illinois, Northwest Indiana, Southeastern Wisconsin |
| Headquarters | Romeoville, Illinois |
| Parent agency | National Weather Service |
NWS Chicago is the National Weather Service forecast office responsible for weather forecasting, warnings, and meteorological services for the Chicago metropolitan area and surrounding counties in Illinois, Indiana, and Wisconsin. The office issues forecasts, watches, warnings, and advisories that affect major population centers including Chicago, Aurora, Joliet, Gary, Kenosha, and the Lake Michigan shoreline. It operates within the broader frameworks of the National Weather Service and the National Oceanic and Atmospheric Administration and cooperates with federal, state, and local partners including Federal Aviation Administration, United States Coast Guard, and state emergency management agencies.
Overview
The office provides continuous monitoring and short- to long-range forecasting for a region that includes urban centers such as Chicago, suburban municipalities like Schaumburg and Naperville, industrial hubs including Gary, Indiana and Joliet, Illinois, and transportation nodes such as O'Hare International Airport and Midway International Airport. Primary responsibilities include issuing warnings for phenomena tied to the Midwestern United States such as severe convective storms that can produce tornadoes affecting counties like Cook County, Illinois and Lake County, Indiana, lake-effect snow along Lake Michigan and winter storm impacts for communities including Waukegan, as well as heat advisories that influence cities like Evanston and Oak Park.
History
Meteorological services in the Chicago region trace back to the 19th century with the U.S. Signal Service and later the U.S. Weather Bureau, eventually becoming part of the modern NWS. The office has evolved through relocations and technological shifts, moving from early observation sites near Grant Park and Midway Airport to modern facilities in Romeoville, Illinois. It has supported response to historic events including the Chicago Fire (1871) aftermath meteorological studies, the Great Blizzard of 1978 impacts in the Midwest, the Super Outbreak (1974) regional tornado impacts, and more recent high-impact events like the Halloween Blizzard of 1991 and multiple derechos that affected the region. The office adopted Doppler radar technology associated with the WSR-88D network and integrated satellite data from platforms such as GOES to improve situational awareness.
Organization and Jurisdiction
The office is part of the National Weather Service network under the National Oceanic and Atmospheric Administration and coordinates with regional offices including NWS Indianapolis, NWS Milwaukee/Sullivan, and NWS Central Illinois. Its forecast area encompasses counties in northeastern Illinois, northwestern Indiana, and southeastern Wisconsin, aligning with county-level emergency management bodies like Cook County Emergency Management and Will County Emergency Management. The staff includes meteorologists trained through institutions and programs such as The Ohio State University Department of Atmospheric Sciences, Penn State Meteorology, University of Illinois Urbana-Champaign Department of Atmospheric Sciences, and operational training paths associated with the National Weather Service Training Center. The office supports aviation operations at Chicago O'Hare International Airport and Chicago Midway International Airport and marine services for the United States Coast Guard District operating on Lake Michigan.
Products and Services
NWS Chicago issues a suite of products including severe thunderstorm warnings, tornado warnings, winter storm warnings, lake-effect snow advisories, heat advisories, and marine forecasts for Lake Michigan. It produces Zone Forecasts, County Warning Area products, Aviation Terminal Aerodrome Forecasts (TAFs) for O'Hare International Airport and Midway Airport, river forecasts in coordination with the National Weather Service River Forecast Center (RFC), and probabilistic outlooks used by utilities such as ComEd and transportation agencies like the Metra and Chicago Transit Authority. The office disseminates information via the NOAA Weather Radio network, social media channels, and partnerships with broadcasters including WGN-TV, WBBM, and regional newspapers such as the Chicago Tribune.
Forecast and Warning Operations
Operational forecasting integrates data from the WSR-88D radar in Romeoville, surface observations from ASOS and AWOS stations at airports, satellite imagery from GOES-R Series, and numerical model output from systems including the Global Forecast System, North American Mesoscale Model, and the High-Resolution Rapid Refresh (HRRR) model. Forecasters apply techniques from synoptic-scale analysis used in NOAA Storm Prediction Center coordination, mesoscale convective system tracking, and ensemble guidance from systems like the Global Ensemble Forecast System. Warning operations coordinate with emergency managers in Cook County, Illinois Emergency Management Agency, law enforcement partners including the Chicago Police Department, and transportation officials at Illinois Department of Transportation to support public safety during events such as severe thunderstorms, flash floods tied to the Chicago River basin, and winter storms that affect interstates like Interstate 90 and Interstate 94.
Research, Technology, and Partnerships
The office engages in applied research and technology integration, collaborating with academic partners such as University of Chicago, Northwestern University, University of Illinois Chicago, and research centers like the Cooperative Institute for Mesoscale Meteorological Studies. It participates in field campaigns that leverage mobile radar platforms and dense observation networks used in projects associated with the National Science Foundation and Federal Aviation Administration studies. Partnerships with Illinois State Water Survey inform hydrometeorological forecasting, while coordination with NOAA Great Lakes Environmental Research Laboratory supports lake-effect and lake-breeze process studies. The office contributes operational observations to national datasets and evaluates new tools such as probabilistic QPF derived from the Ensemble Kalman Filter and machine learning models tested by teams at Argonne National Laboratory.
Public Outreach and Community Programs
Public outreach includes education and preparedness initiatives with schools in districts like Chicago Public Schools and community organizations including local American Red Cross chapters and county emergency management offices. The office supports CERT programs and public briefings during events affecting venues such as Navy Pier and Soldier Field, and provides training for broadcasters, emergency managers, and first responders through workshops hosted with entities like the Illinois Emergency Management Agency. Engagements include storm spotter training coordinated with the Skywarn program, climate services discussions with Chicago Climate Action Plan stakeholders, and participation in community resilience efforts tied to heat-health action plans and urban heat island studies conducted with universities and municipal partners.