Weather Underground
Weather Underground is a weather forecasting service built on a network of over 250,000 personal weather stations worldwide, providing hyperlocal weather data, forecasts, and historical weather information. Originally founded in 1995 as a community-driven platform, it offers both free ad-supported and premium subscription tiers for weather enthusiasts, developers, and general consumers.
Score generated by AI agents based on publicly cited evidence and reviewed by the project maintainer. Not independently validated.
Score History
Timeline events are AI-curated from public reporting. Score trajectory is derived from documented events.
Weather Underground launched as a commercial spinoff of the University of Michigan weather database, offering free weather data to 550 U.S. cities via wunderground.com. Co-founded by Jeff Masters, Perry Samson, and Alan Steremberg, the platform was mission-driven, community-focused, and ad-minimal. Revenue came primarily from modest advertising with no data monetization or exploitation of contributors. The platform embodied the early internet's ethos of open access to public information.
The PWS network launch in 2001 transformed Weather Underground from a simple forecast site into a crowdsourced hyperlocal weather platform. The WunderBlog launched in 2005 and exploded during Hurricane Katrina, establishing Weather Underground as an authoritative weather voice. The platform grew to serve millions of visitors with free API access for developers, webcam hosting, member blogs, and community features. Advertising was present but non-intrusive, and the platform's value proposition centered on open data and community participation.
The Weather Channel Companies (owned by NBC Universal, Blackstone, and Bain Capital) acquired Weather Underground, ending 17 years of independence. While the brand and staff were initially preserved, the acquisition introduced PE-adjacent ownership incentives and consolidated Weather Underground under a media conglomerate. Early commercial pressures emerged through increased ad density and the beginning of shared infrastructure with weather.com, though the core community features and free API remained intact.
IBM acquired The Weather Company for $2 billion, positioning weather data as fuel for its Watson IoT platform. Within 14 months, IBM began systematically stripping community features: member blogs, WUMail, SMS alerts, and the Storm app were all discontinued in April 2017. The location-driven marketing platform JOURNEYfx secretly monetized user geolocation data by selling it to hedge funds and advertisers. IBM's strategy treated Weather Underground's community as a data extraction target rather than a user base to serve.
The free API shutdown on December 31, 2018 destroyed Weather Underground's developer ecosystem, breaking thousands of projects and forcing enterprise pricing on hobbyists. The January 2019 LA lawsuit revealed IBM had secretly sold user location data to hedge funds via the JOURNEYfx platform. Co-founder Jeff Masters departed in October 2019 after 24 years. The v6 app release in December 2019 dropped core features and tanked the Play Store rating from 4.5 stars. This period represented the sharpest acceleration of enshittification, with the platform losing its technical, editorial, and community leadership in rapid succession.
IBM continued stripping Weather Underground's remaining community assets. The Category 6 blog was shuttered in June 2020 during IBM-wide layoffs, with Bob Henson following Jeff Masters to Yale Climate Connections. CSV data exports for PWS owners were removed in early 2020, limiting data portability. Webcam hosting was permanently discontinued in October 2021, deleting over 28,000 webcam feeds. The LA location data lawsuit settled in August 2020 with revised privacy disclosures but no admission of wrongdoing. The platform was increasingly an ad delivery vehicle with deteriorating performance.
Francisco Partners acquired The Weather Company from IBM for roughly $1.1 billion in February 2024, immediately removing ad-free access for non-PWS users in March 2024. Subscription cancellation requires email or phone contact. Ads cover map controls, the website freezes during ad loading, and previously free features continue converting to paid tiers. A third privacy lawsuit was filed in November 2024 over video data sharing. Under PE ownership, the trajectory continues worsening with no sign of community reinvestment.
Alternatives
Community-weather and professional meteorology visualization tool that offers hyperlocal data without the aggressive ad loading and paywall creep that defines Weather Underground's current experience. Windy provides multiple weather model layers including ECMWF and GFS, supports personal weather station integration, and has maintained a cleaner user experience. Not PE-backed in the same extraction-oriented way. Easy switch for most forecast uses; some loss of hyperlocal PWS network density vs. Wunderground's 250,000+ stations.
Community-built platform specifically for personal weather station owners — the community Weather Underground is abandoning. Supports the same station hardware formats (Davis, Ambient Weather, Fine Offset), free API access for contributors, and data portability that Weather Underground removed in 2020. Most modern weather stations can upload to Weathercloud simultaneously with Wunderground, making it a no-cost parallel switch for PWS owners. No PE ownership, no location data sales history.
Dimensional Breakdown
Summaries below were written by AI agents based on the cited evidence. They are editorial interpretations, not independent research findings.
Dimension History
Timeline (37 events)
Weather Underground Founded as University of Michigan Spinoff
Jeff Masters, Perry Samson, Alan Steremberg, and other University of Michigan colleagues incorporated Weather Underground Inc. as a commercial entity, building on the Telnet-based weather information system Masters had developed in 1991. The site wunderground.com launched offering daily forecasts and hourly conditions for 550 U.S. cities, becoming one of the first commercial internet weather services.
Personal Weather Station Network Launched
Weather Underground began hosting data from personal weather stations, allowing users worldwide to submit their own local weather data. This crowdsourced network would grow to become the platform's most distinctive feature and primary competitive moat, eventually encompassing over 250,000 stations across 195 countries.
Jeff Masters Launches WunderBlog (Later Category 6)
Weather Underground co-founder Jeff Masters launched his WunderBlog, which became one of the internet's most popular weather and climate information sources. The blog exploded in readership during Hurricane Katrina in 2005, establishing Weather Underground as an authoritative voice in extreme weather coverage. It was later renamed Category 6.
Weather Underground Wins $3.5M Cybersquatting Lawsuit
Weather Underground filed a cybersquatting suit against Navigation Catalyst Systems Inc. over 250+ typo domain registrations of their trademarks. The court awarded Weather Underground $3.5 million in damages, establishing a landmark ruling on bulk typosquatting practices.
Weather Underground Launches iOS and Android Apps
Weather Underground released mobile apps for iOS and Android platforms, bringing its personal weather station data and hyperlocal forecasts to smartphones. The app was well-received, with early reviews praising it as raising the bar for weather apps. It would eventually accumulate over 5 million downloads with a 4.5-star rating before later degradation.
Weather Channel Acquires Weather Underground
The Weather Channel Companies (owned by NBC Universal, Blackstone, and Bain Capital) acquired Weather Underground after 17 years of independence. Deal terms were not disclosed. Weather Underground maintained its separate brand and website, and existing staff were retained, with its San Francisco headquarters becoming a TWCC regional office. The community received the news with apprehension about corporate influence.
Weather Underground Launches Major Site Redesign
Weather Underground undertook its biggest-ever website redesign, introducing a new logo, updated color palette, new PWS dashboard, and customizable content modules. The classic site remained available at classic.wunderground.com for users who preferred the old layout. Reception was polarized, with some praising the modern look while others complained about excessive white space.
Weather Underground Launches Storm App for iOS
Weather Underground released Storm, a dedicated iOS app for radar and storm tracking that became popular among weather enthusiasts for its comprehensive data layers and visualization features. The app would later be discontinued in favor of The Weather Channel's Storm Radar app, frustrating users who preferred Storm's superior feature set.
IBM Announces $2 Billion Acquisition of The Weather Company
IBM announced a definitive agreement to acquire The Weather Company's B2B, mobile, and cloud-based properties including Weather Underground, weather.com, and WSI for approximately $2 billion. IBM positioned the acquisition as foundational to its Watson IoT platform, planning to merge Weather Underground's 200,000+ personal weather stations with Watson. The Weather Channel TV network was excluded from the deal.
IBM Closes Weather Company Acquisition
IBM completed its acquisition of The Weather Company's digital properties, including Weather Underground. The Weather Company became part of IBM's Watson and Cloud Platform business unit. David Kenny was named to lead the new Watson platform. IBM gained access to over 5,000 enterprise customers in aviation, energy, and insurance who used Weather Company data.
Weather Underground Ends Member Blogs, WUMail, and SMS Alerts
Weather Underground discontinued member blogs, WUMail email service, SMS weather alerts, NOAA Weather Radio rebroadcast, and aviation features. This mass removal of community features marked the first major wave of stripping under IBM ownership, eliminating services that had defined Weather Underground's community identity for over a decade.
Storm App Discontinued in Favor of Weather Channel's Storm Radar
Weather Underground removed support for its popular Storm iOS app, replacing it with The Weather Channel Interactive's Storm Radar app released in June 2017. Users widely criticized the replacement as inferior to the original Storm app, which had offered more comprehensive data layers and better visualization for weather enthusiasts.
Webcam Time-Lapse Service Temporarily Removed After Backlash
Weather Underground announced it was discontinuing webcam time-lapse videos, citing cost concerns. After a mass exodus and wave of user complaints, the company partially reversed the decision, but most users had already been removed from the service and did not return. The incident foreshadowed the full webcam hosting discontinuation that would follow in 2021.
Wundermap Storm Tracks and Storm Reports Features Removed
Weather Underground removed Storm Tracks and Storm Reports features from the Wundermap interactive map. Users had relied on these features to see predicted storm direction, size, hail probability, and storm reporting data. The removal reduced the Wundermap from a comprehensive meteorological tool to a simpler radar and temperature display.
Free API Keys Quietly Removed for Non-PWS Users
Weather Underground silently removed the free API key registration option with no public announcement or advance notice to developers. Thousands of hobby projects, home automation systems, and educational applications relied on the free API tier. Only PWS contributors retained limited API access (1,500 calls/day). New users faced enterprise pricing starting at approximately $200/month.
Change.org Petition Protests API Shutdown for PWS Contributors
A Change.org petition titled 'Wunderground About to Shaft Longtime Weather Station Data Providers' captured community anger over the impending API shutdown. The petition highlighted that PWS owners had purchased, installed, and maintained hardware at their own expense for up to 20 years, providing free data under the expectation of free non-commercial API access. The petition noted that enterprise API pricing was approximately $800/month.
Weather Underground Free API Fully Shut Down
All Weather Underground API subscriptions and access expired on December 31, 2018 (later extended to February 15, 2019). The shutdown broke thousands of developer projects, home automation integrations, and educational applications that had built on Weather Underground's data. Developers scrambled to migrate to alternatives like OpenWeatherMap and Dark Sky. The free API had been a cornerstone of Weather Underground's value proposition to the developer community.
LA City Attorney Sues IBM Over Weather Channel App Location Data Sales
Los Angeles City Attorney Mike Feuer filed a lawsuit against TWC Product and Technology LLC and IBM, alleging the Weather Channel app deceptively collected users' precise geolocation data 24/7 while telling users data was only for 'personalized local weather data, alerts and forecasts.' The suit revealed the data was sold to at least a dozen websites for targeted advertising and to hedge funds analyzing consumer behavior. IBM had developed a location-driven marketing platform called JOURNEYfx to monetize the data.
Reports Reveal Weather Channel App Sold Location Data to Hedge Funds
Multiple media outlets reported that the Weather Channel app's primary revenue source was the sale of location data, with the company internally describing itself as 'a location data company powered by the weather.' The app tracked users' locations on a minute-by-minute basis even when not in use, selling data to hedge funds and private equity firms to monitor consumer shopping and recreation patterns.
All Weather Underground API Keys Stop Working
The final deadline for Weather Underground API access passed, with all remaining API keys deactivated on February 15, 2019. Home Assistant integrations, PiClock projects, OpenSprinkler weather systems, and thousands of other applications that relied on Weather Underground data permanently broke. The only remaining free API access was limited to PWS owners uploading data to the network.
Email Forecast Program Discontinued
Weather Underground announced discontinuation of its Email Forecast Program effective October 1, 2019. Daily email forecasts had been a popular free feature for users who relied on Weather Underground without visiting the ad-heavy website. The removal further reduced the platform's free feature set under IBM ownership.
Co-Founder Jeff Masters Announces Departure
After co-founding Weather Underground 24 years earlier and writing over 3,000 blog posts during a 14-year career at WunderBlog/Category 6, Jeff Masters announced he would leave Weather Underground at the end of October 2019. His departure represented the final severing of the platform's connection to its community-driven roots. Masters subsequently blogged at Scientific American and then Yale Climate Connections.
App v6 Released with Missing Features, Rating Plummets
Weather Underground released app version 6 for Android, which dropped widgets, notification bar icons, manual tile rearrangement, weather station source info, and detailed precipitation data. The app's Play Store rating plummeted from 4.5 stars to predominantly 1-star reviews. Developers acknowledged releasing 'a half-baked app with missing features' in a January 2020 note. Some features were later restored, but tile rearrangement never returned.
Weather.com Identified as Pawn in Data Theft Scheme
Security researchers discovered that Weather.com was compromised by malicious advertising that scraped personal information from mobile users. The attack exploited the platform's advertising infrastructure to intercept user data, highlighting the risks of Weather Underground's ad-heavy business model and the vulnerability created by extensive third-party ad network integration.
CSV Data Export for PWS Data Discontinued
Weather Underground removed the CSV download option for personal weather station daily and hourly data, eliminating the primary data portability mechanism for PWS owners. The dashboard table view's 'Download' button disappeared without announcement. Users were left without a straightforward way to export their own contributed historical data, deepening lock-in for the platform's most invested contributors.
IBM Lays Off Dozens at Weather Company, Shutters Category 6 Blog
The Weather Company laid off dozens of employees as part of IBM's broader pandemic-era workforce restructuring. The layoffs were announced internally on May 21 with a last day of June 22. The company simultaneously shuttered the Category 6 blog (formerly WunderBlog), which had run for 15 years as one of the internet's most popular weather information sources. Bob Henson subsequently joined Jeff Masters at Yale Climate Connections.
IBM Settles LA Location Data Lawsuit
IBM and TWC Product and Technology settled the Los Angeles City Attorney's lawsuit over Weather Channel app location data practices. Under the settlement, IBM agreed to revise opt-in consent notices with additional location data disclosures, update its 'learn more' page, and provide two years' notice of any changes to those disclosures. IBM also donated approximately $1 million in equipment to LA for COVID-19 contact tracing efforts.
Webcam Hosting Service Permanently Discontinued
Weather Underground permanently discontinued its webcam hosting service, deleting all webcam data from its servers. The service had previously hosted over 17,190 international weather webcams and 11,390 U.S. cameras. The company stated it wanted to 'better focus on the core products,' but the move eliminated another community feature that had been part of the platform's identity since the early 2000s.
Ads Covering Map Controls Documented by Weather Community
Weather forum users documented that advertisements on the Weather Underground website were covering interactive map controls, forcing users to close ads before they could interact with basic Wundermap features. The pattern of ads obstructing functional controls represented a dark pattern where advertising directly impeded core platform functionality rather than appearing in designated ad spaces.
Geolocation Class Action Settled After Three Years
The Weather Channel settled its class action lawsuit (Hart v. TWC Product and Technology LLC) alleging fraudulent collection and monetization of geolocation data. The case, filed in 2020, alleged the app tracked users' precise locations at all times and sold data to third-party advertising agencies without adequate disclosure. The settlement terms were not publicly disclosed, and the case was dismissed with prejudice.
VPPA Lawsuit Filed Over Video Viewing Data Sharing
A lawsuit was filed against IBM's Weather Company in federal court in New York, alleging that weather.com shared users' video viewing data and personally identifiable information with third parties mParticle and AppNexus/Xandr (Microsoft) without consent. The complaint cited violations of the Video Privacy Protection Act and the Maryland Wiretapping Act, alleging that video URLs and user names were 'intercepted in real time' by advertising firms.
PWS Ad-Free Grandfathering Cutoff Date Set
Weather Underground established August 2023 as the cutoff date for grandfathered ad-free access for personal weather station contributors. PWS owners who registered before this date and maintained active data uploads would continue receiving ad-free access, while new PWS registrants after August 2023 would not receive this benefit. The two-tier system created unequal treatment among contributors providing identical value to the network.
IBM Agrees to Sell Weather Company to Francisco Partners
IBM announced a definitive agreement to sell The Weather Company's assets to private equity firm Francisco Partners. The deal was valued at approximately $1.1 billion ($750M cash, $100M deferred over 7 years, $250M contingent), representing a significant loss from IBM's $2 billion acquisition in 2016. IBM retained access to weather data for its AI models. The sale reflected IBM's strategic pivot away from consumer-facing digital properties toward enterprise software and AI.
Francisco Partners Completes Acquisition of The Weather Company
Francisco Partners completed its acquisition of The Weather Company from IBM, including Weather Underground, weather.com, and Storm Radar. The Weather Company began operating as a standalone entity under PE ownership. Rohit Agarwal would later be installed as CEO in November 2024 to guide the company's post-IBM growth strategy. The transaction marked Weather Underground's third ownership change in 12 years.
Ad-Free Access Removed for Non-PWS Users
Weather Underground moved all non-PWS users who had been accessing ad-free content at no cost to a free, ad-supported experience. The change, implemented just one month after the Francisco Partners acquisition closed, significantly expanded the ad-supported user base. Non-PWS users who wanted ad-free access were directed to monthly and annual subscription plans. The rapid timeline suggested this had been planned as an immediate post-acquisition monetization move.
Subscription Cancellation Reported as Requiring Phone/Email Contact
Users reported to the Dark Patterns Tip Line that canceling a Weather Underground subscription could not be done through the website interface, instead requiring email or phone contact with customer support during limited hours. This roach motel pattern — easy sign-up but difficult cancellation — was documented as a recurring complaint across consumer review platforms.
Fourth Privacy Lawsuit Filed Over Weather Channel Video Data Sharing
IBM was sued again over Weather Channel data sharing, with California plaintiff Ed Penning alleging that watching videos on the Weather Channel website caused his full name, gender, email address, precise geolocation, and video URLs to be shared with mParticle and AppNexus/Xandr without consent. The VPPA lawsuit sought class action certification with potential statutory damages of $2,500 per violation. This represented the fourth major privacy lawsuit against the platform's operators.