Why tempC from the Forecast Hour Doesn’t Match the Hourly Observation — and How to Detect the Gap
Forecast temps and actual observations diverge more than you’d expect. Here’s why it happens, when it matters, and how to detect it in your app.
API
API
API
Why wind_degree Is Useless for Interpolation (And How to Build Direction-Aware Wind Logic That Doesn’t Break at North)
wind_degree wraps at 360°. Naive averaging breaks near north. Here’s how to handle circular wind direction correctly in your app.
API
Why station_id Changes Between Calls — and How to Build a Response Pipeline That Doesn’t Break When It Does
WeatherAPI can return a different METAR station between calls for the same location. Here’s why it happens and how to build a pipeline that handles it cleanly.
API
Why Model Initialization Time Matters More Than Model Name When Choosing Forecast Data
GFS, NAM, HRRR — the model name isn’t what determines forecast quality. The init time is. Here’s what that means for API-driven apps.
API
Why API-Key-Per-Tenant Is the Wrong Pattern for Multi-Tenant Weather Apps (And What to Build Instead)
Giving each tenant their own WeatherAPI key creates quota, caching, and deduplication headaches. Here’s a better architecture pattern.
API
Why uv_index Spikes at High Altitude Before Cloud Cover Does: Understanding the Fields That Don’t Move Together
UV index and cloud cover fields can move in opposite directions at elevation. Here’s why, and how to build altitude-aware UV logic in your app.
API
Why Snow Water Equivalent Gets Dropped from API Responses (And How to Back-Calculate It from What You Do Get)
SWE is missing from most weather API responses. Here’s why, and how to estimate it from totalsnow_cm, temp, and humidity fields you already have.
API
Why moon_phase Isn’t Enough: Building Lunar Illumination Estimates from WeatherAPI’s Astronomy Fields
moon_phase strings tell you the phase name, not how bright the sky actually is. Here’s how to derive lunar illumination from WeatherAPI’s astronomy fields.
API
Why vis_km Collapses at Night: Visibility Fields, Sensor Limits, and Building Fog Detection That Actually Works After Dark
Visibility fields in weather APIs behave differently after dark. Here’s why vis_km breaks down at night and how to build fog detection that accounts for it.
API
Why humidity_pct Alone Will Mislead You: Building Evapotranspiration Estimates from WeatherAPI Fields
humidity_pct alone tells you almost nothing about water demand. Here’s how to derive ET₀ estimates from WeatherAPI’s hourly fields — and where the math breaks down.