Weather Watching
I was walking around New York last month during some light rain and noticed about half the people had umbrellas open. When the rain picked up a few minutes later, that number jumped closer to 80%. It got me thinking it'd be cool to track this somehow, so I built a website! I am taking a sidewalk livestream, feeding it into a YOLO model for people tracking, then sending a frame of each detected person to Gemini 2.0 Flash, which returns structured JSON about each person's clothing and if they're holding an umbrella. I also had fun making the site look like a TV weather channel. I showed some…
Weather Watching launched on June 23, 2025 with 94 votes, #452 of 7,999 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Weather Watching analyzes a New York City sidewalk livestream to track umbrella usage among pedestrians. Using computer vision to detect people and an AI model to identify umbrellas and clothing, the tool generates structured data about real-time umbrella adoption rates as weather conditions change. The site presents this data in a weather channel interface style, demonstrating how modern vision models can quickly answer practical observational questions that would have been difficult to automate previously.
written from the facts on this page · September 2026
From the sources
AI is watching this Manhattan doorbell camera, counting the people walking by. It counts what they're wearing and if they have an umbrella. Sometimes the best forecast is just paying attention. A simple person-detection AI model called YOLO ("You Only Look Once") watches the video feed continously, and draws a box around every pedestrian it sees. As people walk through the frame, it assigns each one a unique ID. It can follow people across multiple video frames, even if they briefly disappear behind someone else. For each person, the system saves a single clear image to analyze what they're wearing. All those "best shot" frames get sent in a batch to a LLM, specifically Google's Gemini, a…from walzr.com
In the maker’s words, at launch
I was walking around New York last month during some light rain and noticed about half the people had umbrellas open. When the rain picked up a few minutes later, that number jumped closer to 80%. It got me thinking it'd be cool to track this somehow, so I built a website! I am taking a sidewalk livestream, feeding…
Does a similar job
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GrayCloud – a modern Dark Sky alternativeJun 2026 · graycloud.app · ▲8I miss Dark Sky, so I built my own weather app. Here's how GrayCloud works: * Raincast: minute-by-minute rain prediction and accumulation tracking for your exact location * Forecasts: 10 day forecasts use multiple high resolution sources and correct for bias at your location. * Alerts: rain starting, stopping, severe weather, daily summary and more * Widgets: home and lock screen widgets * Multi-platform: apple watch and mac apps I use NOAA and ECMWF models for core weather data and a custom model to compute rain accumulation and the next 60 minute radar movements. I also offer Apple…
Source: Show HN post ↗ · launch text quoted in part
Launched alongside, June 2025
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