Project Description | Algorithms | Verification | Data | Updates | Evaluations
There are six algorithms in the collection assembled by John Cortinas and detailed in this paper: http://www.nssl.noaa.gov/~cortinas/preprints/canada6.html. Currently, one of these algorithms, the melting model, is turned off because it needs more work to make it run faster. It produces a result only if the sounding is warm enough to make rain the only possibility. Of the five remaining algorithms, one, the thickness algorithm, contributes a precipitation type determination only if the surface pressure exceeds 1000 mb. So, for many locations and times, only four algorithms produce a result. The NCEP algorithm is the one currently used in the Eta and AVN models. The Bourgouin algorithm is used in Canada. The thickness algorithm is based on the traditional method of precipitation type forecasting. Here is the list of algorithms:
More information on the algorithms will be posted later.
The precipitation types determined by the algorithms are listed below:
Graphics showing the stations for which the models are generating precipitation-type forecasts are:
