Zambretti Forecaster - v1.0
Enter Data
Environment: Hemisphere:   Local 'Weather Range':   Low:  High:
Current Variables: Wind conditions:   Month:
(Relative / Sea Level Adjusted)
(hPa / mb):    Trend:
12 Hour Forecast: Your forecast will appear here
Best done at 09:00 local solar time

This is an input / output form for a Javascript version of the the 1915 Negretti and Zambra (Zambretti) weather forecaster.

The original was designed for the Northern Hemisphere and UK 'Weather Range'. ie. The nearer the Poles the greater the spread between lower and upper barometer levels and large 'trends' are needed for weather conditions change. Conversely, the nearer the Equator the smaller the 'spread' and smaller 'trends' for change.

A forecast at approx. 09:00 local Solar Time is better than 90% accurate ! - even though it takes no account of rate of barometer change, wind speed or temperature.