Meet The TMJ4 Weather Team: Milwaukee’s Leading Meteorologists For 2026

The TMJ4 weather team, known professionally as Storm Team 4, consists of a dedicated group of certified meteorologists including Chief Meteorologist Brian Niznansky, Kristen Kirchhaine, Marisa Woloszyn, and Brendan Johnson. They provide 24/7 localized forecasting for Southeast Wisconsin, utilizing advanced radar technology and the "Exact Track" system to track Lake Michigan’s microclimates and severe weather patterns.

The Role of the TMJ4 Weather Team in Southeast Wisconsin

In the complex meteorological landscape of Southeast Wisconsin, the TMJ4 weather team serves as a critical bridge between atmospheric data and public safety. Operating out of WTMJ-TV’s Milwaukee studios, the team manages the unique challenges posed by the region’s proximity to Lake Michigan, which creates distinct microclimates that can vary significantly between the lakeshore and inland counties like Waukesha or Washington.

As of 2026, the team continues to prioritize hyper-local accuracy. This isn't merely about predicting rain or shine; it involves sophisticated modeling of the "lake breeze" effect, which can drop temperatures by 15 degrees in a matter of minutes, and the precision tracking of winter lake-effect snow bands. The team’s primary mission is to provide "Weather First" coverage, ensuring that residents have ample lead time to prepare for the blizzards, thunderstorms, and humidity spikes characteristic of the Great Lakes region.

The expertise required for this role is significant. Each member of the team holds credentials from recognized institutions like the American Meteorological Society (AMS) or the National Weather Association (NWA). Their work extends beyond the television screen, encompassing digital platforms, social media, and emergency broadcast systems, making them a ubiquitous presence in the daily lives of Wisconsinites.

Profiles of the Storm Team 4 Meteorologists

The strength of the TMJ4 weather team lies in the diverse expertise and local knowledge of its individual members. By 2026, the roster has solidified into a group known for both scientific rigor and community relatability.

Brian Niznansky: Chief Meteorologist

Brian Niznansky leads the team with a focus on precision and severe weather preparedness. A native of Southeast Wisconsin and a graduate of the University of Wisconsin-Green Bay, Niznansky’s deep roots in the state provide him with an intuitive understanding of local weather nuances. As Chief, he oversees the evening broadcasts and sets the technical standards for the station's forecasting models. His approach often emphasizes the "Why" behind the weather, breaking down complex meteorological phenomena into actionable information for viewers.

Kristen Kirchhaine: Morning and Midday Forecasting

Kristen Kirchhaine is a central figure for the TMJ4 morning news block. Known for her data-driven approach, she specializes in the early-morning "commute forecasts," which are vital for a region frequently impacted by ice and fog. Her background in meteorology allows her to navigate the rapid shifts in morning temperatures that occur as the sun rises over Lake Michigan, providing viewers with high-resolution timing for precipitation.

Marisa Woloszyn: Weekend and Evening Specialist

Marisa Woloszyn brings a wealth of experience in high-impact weather events. Her role often involves managing the weekend shifts and contributing to the station’s environmental and climate reporting. Woloszyn is particularly skilled at utilizing the station's 4D radar technology to visualize storm structures, helping viewers understand the severity of incoming fronts before they reach the metro Milwaukee area.

Brendan Johnson: Meteorologist and Digital Lead

Brendan Johnson rounds out the team, frequently appearing on weekend mornings and contributing heavily to TMJ4’s digital and mobile platforms. As digital consumption of weather data has increased, Johnson’s role in translating complex data into digestible social media updates and app alerts has become indispensable for the station’s 2026 strategy.

Advanced Technology: The Exact Track 4D System

To maintain their status as a leading news source, the TMJ4 weather team utilizes a suite of high-tech tools. The centerpiece of their operation is the Exact Track 4D radar system. Unlike standard Doppler radar, which may have refresh delays, Exact Track provides high-definition, real-time data that allows meteorologists to see "inside" a storm.

S-Band Radar and Local Integration

The team leverages S-Band radar technology, which is superior for penetrating heavy precipitation. This is crucial during Wisconsin’s summer months when torrential downpours can "blind" lesser radar systems. By integrating this with the National Weather Service (NWS) NEXRAD feeds, Storm Team 4 creates a redundant and highly accurate observation network.

The Power of Predictive Modeling

In 2026, the team employs proprietary computer models that ingest local data from weather stations across the "WeatherNet"—a series of sensors located at schools and businesses throughout Southeast Wisconsin. This dense network allows the team to correct broader global models (like the GFS or Euro) with hyper-local observations, resulting in a more accurate 4-day and 7-day "4Cast."

The Science of the "Lake Effect" in Milwaukee

One of the most frequent technical discussions the TMJ4 weather team engages in involves the influence of Lake Michigan. For meteorologists in Milwaukee, the lake is the single most important variable.

The Lake Breeze and Thermal Inversions

During the spring and summer, the lake remains much cooler than the land. This temperature gradient creates a localized high-pressure zone over the water, which pushes cool air inland—the famous "cooler by the lake" phenomenon. The TMJ4 team must accurately predict how far inland this "lake breeze front" will travel. If the front stalls, it can act as a trigger for localized thunderstorms; if it moves quickly, it can provide relief from heatwaves for lakeshore residents while those in Oconomowoc remain in the 90s.

Lake-Effect Snow Mechanisms

In the winter, the process reverses. Cold arctic air moving over the relatively warm waters of Lake Michigan picks up moisture and heat. This creates narrow bands of intense snow. The TMJ4 weather team uses specialized "omega" and "vorticity" charts to determine where these bands will "set up." A shift of just five miles in wind direction can mean the difference between a dusting and ten inches of snow for neighborhoods in Kenosha or Racine.

Accessing Storm Team 4: Platforms and Integration

The TMJ4 weather team ensures that their forecasts are accessible regardless of how a viewer consumes media. In 2026, this integration is seamless across several channels.

The TMJ4 Weather App

The mobile application is a cornerstone of the team’s service. It features "FutureView," which allows users to scroll through the next 24 hours of simulated radar. For users in 2026, the app also integrates lightning detection and per-street precipitation alerts, which are vital for outdoor planning and safety during Wisconsin's volatile spring season.

Community Involvement and Weather Safety Education

The TMJ4 weather team views itself as a public service entity. This is evidenced by their extensive outreach programs. Throughout the year, members of Storm Team 4 visit local schools to teach students about atmospheric science and the importance of having a "weather-ready" plan.

Severe Weather Preparedness Week

Every spring, the team leads a concentrated effort to educate the public on tornado safety. This includes explaining the difference between a Watch (conditions are favorable) and a Warning (danger is imminent). By 2026, they have expanded these efforts to include "Digital Town Halls," where viewers can ask questions about home reinforcement and emergency kit essentials.

Climate and Environmental Reporting

Beyond the daily forecast, the team investigates long-term trends affecting the Great Lakes. This includes reporting on lake levels, which impact erosion and local property, as well as the changing duration of the winter ice cover. By providing this context, the TMJ4 weather team helps the community understand not just what is happening today, but how the local environment is evolving over decades.

FAQ: Common Questions About the TMJ4 Weather Team

How does the TMJ4 weather team predict lake-effect snow?

The team uses high-resolution "mesoscale" models that factor in the temperature difference between the air and the lake water. When this difference is at least 13 degrees Celsius (about 23 degrees Fahrenheit), lake-effect snow becomes possible. They also track wind "fetch"—the distance the air travels over the water—to determine the intensity of the snow bands.

What is the "Exact Track 4D" radar?

Exact Track 4D is the station's premier radar technology. The "4D" refers to the three spatial dimensions plus the dimension of time (real-time updates). It allows the meteorologists to see the vertical structure of a storm, identifying where hail is forming or where a tornado's "debris ball" might be located.

Why is there sometimes a difference between the TV forecast and the app?

The TV forecast is often the most recently "human-vetted" data, where a meteorologist has adjusted the models based on their professional experience. The app sometimes relies on automated model updates that occur between live broadcasts. For the most accurate information during rapidly changing weather, the live broadcast or the "Live" section of the app is recommended.

How can I get my school or organization a visit from a TMJ4 meteorologist?

Requests for school visits or community appearances can be made through the TMJ4 website under the "About Us" or "Contact" sections. The team prioritizes educational events that focus on STEM and weather safety.

Does the TMJ4 weather team cover all of Wisconsin?

The team primarily focuses on the ten counties of Southeast Wisconsin, including Milwaukee, Waukesha, Racine, Kenosha, Ozaukee, Washington, Sheboygan, Walworth, Jefferson, and Dodge. However, for major statewide events like significant blizzards, they collaborate with sister stations to provide broader coverage.

Recommendations for Staying Weather-Aware

To get the most out of the TMJ4 weather team’s resources, residents should take a multi-layered approach to weather awareness. Relying on a single source can be risky during severe events.

1. Download the Storm Team 4 App: Ensure that "Location Services" are enabled so you receive alerts specific to your current neighborhood, not just the city of Milwaukee.
2. Enable NOAA Weather Radio: While the TMJ4 team provides excellent digital coverage, a battery-operated NOAA weather radio is a vital backup if power and cell towers fail during a storm.
3. Follow Individual Meteorologists on Social Media: For "behind-the-scenes" data and more frequent updates than a standard broadcast allows, follow Brian Niznansky and the rest of the team on platforms like X (formerly Twitter) or Facebook.
4. Understand Your Geography: Know which county you are in and which counties are "upstream" (to the west and south) of you. This helps you understand how storms tracked by the TMJ4 team will affect your specific location.

By combining the professional expertise of the TMJ4 weather team with proactive personal planning, residents of Southeast Wisconsin can navigate the region’s volatile weather with confidence and safety.