fbrissette
Well-known member
What's a weather analog
It's a case from the historical past where atmospheric conditions (as defined by several spatialized variables such as wind speed, specific humidity, pressure, temps etc) were very similar to current conditions.
The closer the analogue, the closest you can expect the present outcome to match the outcome of the historical period (analogue).
However, as with numerical models, lack of actual observations of atmospheric conditions coupled with the chaotic nature of the climate system renders long-term forecasting (>5 days) very suspect.