classification_jc: classification_jc
In jcext: Extended Classification of Weather Types

Description Usage Arguments Value References See Also Examples

Calculates the classification of the main weather types for one central point that is surrounded by 16-points (grid16). Wind-flow characteristics are computed for the daily pressure field according to the rules proposed by the original Jenkinson and Collison classification (see Jones et al. 1993, Jones et al. 2016).

1	classification_jc(mslp, grid16, centralp, loni, lati, times, gale)

`mslp`	3-Dimensional multi-array ([loni,lati,time]) with mean sea level pressure in Pa.
`grid16`	Data frame obtained in the main function (extended_jc) that contains the 16 grid-points defining the scheme. First row is for longitudes, while the second row is for latitudes.
`centralp`	Numeric that refers to the central point for which the JC classification is calculated.
`loni`	Array with longitude values.
`lati`	Array with latitude values.
`times`	Array with the dates used.
`gale`	A logical for deteriming Gale days.

Daily frequencies of Weather Types and airflow indices.

Jones, P. D., Hulme M., Briffa K. R. (1993) A comparison of Lamb circulation types with an objective classification scheme Int. J. Climatol. 13: 655–663.

Jones, P. D., Harpham C, Briffa K. R. (2013) Lamb weather types derived from Reanalysis products Int. J. Climatol. 33: 1129–1139.

calculate_cwt

# Load data
data(press)
mslp  <- press$msl
loni  <- press$loni
lati  <- press$lati
times <- press$dates
# Define a central point
centralp <- c(10,50)
# Get the scheme for the  central point
grid16 <- get_jcpoints(10,50)[1:16]
classification_jc(mslp, grid16, centralp, loni, lati, times, gale=FALSE)