The National Weather Service (NWS) is implementing a significant modernization effort, transitioning from all-uppercase letters to mixed-case letters in its weather forecasts. This change, facilitated by upgrades to the Advanced Weather Interactive Processing System (AWIPS 2), reflects the agency’s commitment to leveraging technology for clearer and more accessible weather communication. For decades, the NWS relied on teletype systems that only supported uppercase letters. While forecasting technology advanced, this convention persisted due to compatibility with older equipment used by some customers.
From Teletype to Modern Technology: The Evolution of NWS Forecasts
The shift to mixed-case has been a long time coming. The NWS has proposed this change multiple times since the 1990s, when the widespread adoption of the internet and email rendered teletype obsolete. In fact, the use of all capital letters online became associated with shouting or anger, making the NWS forecasts appear outdated and potentially misconstrued. However, the transition required a phased approach to allow users with legacy equipment to adapt. The recent upgrade to AWIPS 2, the core computer system used by forecasters to generate predictions, finally enables this much-needed update.
Image: National Weather Service forecasters utilizing modern technology.
A Phased Rollout for Improved Clarity
Starting May 11, 2023, following a 30-day notification period for customers, several key forecast products will transition to mixed-case:
- Area Forecast Discussions: Detailed analyses of current and expected weather conditions.
- Public Information Statements: Informational messages regarding specific weather events or situations.
- Regional Weather Summaries: Broad overviews of weather patterns across larger geographic areas.
Severe weather warnings will adopt mixed-case later in the summer, with other forecasts and warnings transitioning throughout early 2024.
Uppercase Letters Still Relevant in Emergency Situations
While mixed-case enhances readability, uppercase letters will retain their importance. Forecasters will still utilize all capitals in weather warnings to emphasize imminent threats during exceptionally dangerous events. Additionally, certain international forecast products, like those for aviation and shipping, will continue using uppercase due to established international agreements that standardize weather communication across borders. This ensures consistency and avoids potential misinterpretations in critical sectors.
Image: Example of a National Weather Service weather warning.
National Weather Service Continues to Evolve
This transition to mixed-case by the National Weather Service signifies a commitment to modernizing communication and improving the accessibility of critical weather information. It demonstrates a responsiveness to evolving user needs and technological advancements, ultimately ensuring clearer and more effective delivery of vital weather forecasts. While initially appearing as a small change, this update reflects a broader effort to optimize communication clarity and enhance public safety.
