Cross Totals Index

Usage

Cross_Totals_Index(td850, ta500)

Arguments

td850: dew point temperature at 850 hPa (K).
ta500: air temperature at 500 hPa (K).

Value

the computed cross totals index (K).

References

Miller, R.C., 1967. Notes on analysis and severe storm forecasting procedures of the Military Weather Warning Center. Tech. Rep. 200, AWS, U.S. Air Force. 94 pp. [Headquarters, AWS, Scott AFB, IL 62225].

Examples

data("ERA5_pl")
hus <- ERA5_pl$hus
ta <- ERA5_pl$ta
hus_d <- dim(hus)
pa <- ERA5_pl$plev / 100 # convert to hPa
l500 <- which(pa == 500)
l850 <- which(pa == 850)
pa <- convert_plev_to_array(pa, hus_d)
td <- td_from_hus(hus, pa, nthreads = 1)

res <- Cross_Totals_Index(td[, , l850, ], ta[, , l500, ])