THE PRIMARY IMPACT TO CUSTOMERS RECEIVING THE GFS WILL BE THAT THE
DEFAULT PRECIPITATION TYPE ALGORITHM WILL CHANGE FROM THE BALDWIN METHOD
TO THE DOMINANT PRECIPITATION TYPE. THE DOMINANT PRECIPITATION TYPE IS
DETERMINED BY TAKING THE PREDICTED TEMPERATURE AND MOISTURE PROFILES AND
RUNNING THEM THROUGH FIVE ALGORITHMS: BALDWIN (NCEP)...REVISED
NCEP...RAMER...BOURGOUIN
...AND AN EXPLICIT MICROPHYSICS ALGORITHM. AT EACH POINT...THE CODE
DETERMINES WHICH PRECIPITATION TYPE WAS PREDICTED BY THE MAJORITY OF THE
ALGORITHMS AND USES THAT AS THE DOMINANT TYPE. TIES ARE BROKEN IN FAVOR
OF THE MORE DANGEROUS WEATHER (ZR>SN>IP>RA).
Bron:
http://www.nco.ncep.noaa.gov/pmb/changes/GFS-10_10_2007-12Z.html
Neerslagtype wordt dus wel degelijk door het model bepaald en als 'flag' in de uitvoer gezet (in de vorm van 4 parameters die op 0 ('uit') of 1 ('aan') kunnen staan).
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