What Does CBM Stand For?

The Short Answer: Certified Broadcast Meteorologist

In the context of weather and television, CBM stands for Certified Broadcast Meteorologist. It is a professional certification offered through the American Meteorological Society (AMS) that signals a broadcaster has both the scientific foundation of a trained meteorologist and the communication skill to deliver weather clearly to a public audience.

That second half matters. Plenty of credentials test knowledge alone. The CBM is built around a particular job: standing in front of a camera (or behind a microphone) and translating atmospheric science into forecasts that viewers can act on. The certification therefore evaluates what you know and how you present it.

If you came here wondering about the broader picture, our companion pages on what the CBM is and the meaning of CBM cover the same ground from slightly different angles. This article focuses on the name itself, what each word signals, and what sits behind those three letters.

Who Issues the CBM and Why It Exists

The certification is administered by the American Meteorological Society, the same professional body behind the long-running Seal of Approval tradition for on-air meteorologists. The CBM is the AMS's formal certification program for broadcast weather professionals, and it is distinct from general professional certifications in atmospheric science.

Each word in the title carries meaning:

• Certified means an external body has verified your qualifications against published standards, not that you simply claim expertise.
• Broadcast means the credential is aimed at on-air work in television, and by extension other broadcast delivery, not at research or forecasting for industry clients.
• Meteorologist means a science-trained professional, which is why a recognized degree is part of eligibility.

More Than a Test: The Written Exam Plus Weathercast Evaluation

One of the most commonly misunderstood features of the CBM is that it has two distinct evaluation components. Candidates do not simply sit an exam and receive a certificate.

1. A written examination covering meteorological knowledge across fifteen subject areas.
2. Weathercast evaluation, in which you submit two additional weathercasts that are reviewed against separate performance criteria.

These are different instruments measuring different things. The written exam tests scientific knowledge. The weathercast review tests presentation and graphics. It is important not to conflate them: the weathercast criteria are not written-test topic domains, and the written-test topics are not what reviewers score in your weathercasts.

If you want to understand how this two-part structure affects difficulty, see How Hard Is the CBM Exam? for a fuller discussion.

Who Can Actually Hold the Title

Because the credential carries the word "Meteorologist," eligibility is anchored in education and professional experience. Candidates need:

• An accredited meteorology or atmospheric-science degree, or an approved equivalent.
• The required coursework, documented through transcripts.
• Two years of full-time or three years of part-time on-air experience.

Student-station work does not count toward the on-air experience requirement, which is a detail that catches some recent graduates off guard. The point is professional broadcast experience, not campus practice.

You apply through the AMS before scheduling your exam. For the full qualification picture, our guide to CBM requirements and eligibility walks through each prerequisite in detail.

What the Written Exam Looks Like

The written portion is a closed-book test of 100 multiple-choice and true/false questions. The passing score is 75%. The split between scored and unscored questions is not disclosed publicly.

On timing, the legacy-provider official FAQ describes 120 minutes. Because the testing provider has changed over time (the current provider is SMT/Prometric, while an older AMS FAQ still names PSI), you should reconfirm the time limit on your actual appointment confirmation rather than relying on any single source.

For a deeper look at the scoring threshold, read CBM Passing Score 2026. And if you are curious about outcomes, the CBM pass rate article explains what is and is not publicly known, since current written-exam pass rates are not disclosed.

The Fifteen Subject Areas Behind the Letters

The AMS publishes a study guide and a linked references page that lay out the subject headings candidates should prepare against. Preparation follows fifteen substantive subject headings, running from General Meteorological Knowledge through Winter Weather. An AMS Glossary of Meteorology entry sits just ahead of them as a terminology resource, but it is not counted as a subject area.

An important caveat: these are unweighted, issuer-published reference topics. They are not an official weighted or exhaustive blueprint, and AMS does not publish topic percentages on these pages. Any claim that one area carries the most weight would be a guess, so treat all fifteen as fair game. Our complete guide to all 15 CBM content areas expands on each one.

Why the list reads the way it does

Notice how the topics mix pure atmospheric science with practical broadcast concerns. Physical Meteorology, Cyclones and Jets, and Numerical Weather Prediction are classic science topics. Radar Meteorology and Satellite are interpretation skills you use daily when explaining an evolving storm. Weather Safety and Flooding reflect the public-service responsibility of a broadcaster during hazardous events. Station Scientist reflects the role many CBM candidates play inside a newsroom, and Regional Weather rewards knowing the patterns specific to the area you cover.

For a quick-reference companion once you have studied the material, the CBM cheat sheet condenses the must-know facts into a single page.

The Weathercast Side of the Credential

Beyond the written test, candidates submit two additional weathercasts. These are described as active and routine, with a maximum of 5 minutes each. Reviewers evaluate them on three criteria: Graphical Content, Explanation and Presentation. A candidate must earn an average above 3.0 in each of those areas separately, meaning strength in one cannot compensate for weakness in another.

If your weathercast is delivered in Spanish, an English transcript is required.

This dual structure is the clearest answer to "what does the 'Broadcast' in CBM really mean": the credential is not satisfied by scientific knowledge alone. It demands evidence that you can communicate.

Fees, Validity and Renewal

The application fee is $330 for AMS members and $660 for nonmembers. Testing adds a separate charge each time you schedule: $60 for remote testing, $75 at a US test center, or $85 at an international center.

The remote first-attempt totals shown exclude membership dues and your own preparation costs. Once certified, the credential is valid for one year and renews annually, with 28 professional-development points required every five years. Our full CBM certification cost breakdown covers the pricing mechanics, and the ROI analysis helps you weigh it against your career goals. For scheduling logistics, see CBM exam dates and deadlines.

Where the CBM Matters Professionally

The CBM is relevant to people working as on-air meteorologists, typically at local television stations, and to those building toward chief meteorologist or senior weather roles. Because it validates both science and communication, it is most meaningful in newsrooms where credibility is a competitive differentiator.

We deliberately avoid quoting salary figures here because no verified numbers are available to support a specific claim. If you are researching earnings and openings, the CBM salary guide and the CBM jobs overview discuss how to think about the credential's market value qualitatively.

Not the Other "CBM" You Might Have Seen

The three letters "CBM" are shared by several unrelated credentials and terms in other industries. This article, and this site, concern only the Certified Broadcast Meteorologist credential from the American Meteorological Society. If a search brought you here looking for something in maintenance, reliability, medical coding or any other field that happens to abbreviate to CBM, the details above (the AMS, the fifteen meteorology subject areas, the weathercast evaluation) will not apply to you.

For the cleanest disambiguation, our pages on what a CBM is and what CBM means restate the definition in plain terms.

Sequencing Your Preparation by Subject

Because AMS publishes no topic weights, a sensible approach is to start with foundations that other topics depend on, then move to interpretation skills, then high-consequence hazards. Here is one way to order the fifteen areas over six weeks. Adjust it to your own strengths.

Practice with realistic question styles is where most candidates close their gaps. You can drill across all fifteen areas using our CBM practice tests, and our complete study guide lays out a fuller approach. For official background, the CBM training overview points to additional resources, and the main CBM Exam Prep site is the place to start timed practice.

Frequently Asked Questions