Forecast versus reality
Save a forecast before its hour arrives. Return to record what you actually see and compare it with the original prediction.
Save a future forecast, or try the clearly labeled practice comparison.
Your sky notebook
Save a prediction now; observe during its forecast hour from the same place. Entries stay on this device.
Open the Weather Explorer and allow location to save a local forecast. You can explore a practice comparison here without location.
The science behind the scene
Forecasts describe possible future conditions using models and observations. A probability is not a promise: rain can occur on a low-probability day or miss a high-probability one. One observation cannot establish a forecast’s accuracy. A fair evaluation needs many comparable forecasts, consistent measurements and matching locations and times.
National Weather Service · Precipitation probabilitySave a future forecast, or try the clearly labeled practice comparison.
Complete the experiment above to unlock.