Jun-Sep 2017 precipitation (mm) for West Africa: (a) total accumulation; 100-mm isohets (red dashed line), 600-mm isohyets
(red solid line), (b) Departure from 1981-2010 climatology.
Since the moisture factor was the first bioclimatic variable examined, the average yearly rainfall isohyets
for the period 1981-2010 were observed.
The average annual rainfall is defined by the continental equatorial regime, with annual isohyets
around 700 to 1,200 mm.
The six rainiest day's isohyets
in the flooding window, November-December 2011.
Pulling out my old school Phillip's atlas (1969) showed that lines joining up places with equal rainfall ("isohyets
") join Liverpool up with Cheshire, the West Midlands and even parts of the South East all the way to the Kent coast!
Mean rainfall isohyets
have shifted by more than 185 km southwards (Jauro, 2007).
Traditionally, the dense isohyets
are depicted around the highest part of this upland (Galvonaitc et al.
A map of isohyets
(contours of equal rainfall) showing mean annual UAE rainfall for the 18-year period 1971/1972 through 1988/1989 indicates a figure for the western Ru'us al-Jibal in excess of 160 mm, but apparently not in excess of 180 mm (UAE University 1993, Plate 50).
In our analysis, we have adopted the 500 and 900 mm annual rainfall isohyets
as the lower and upper limits for the HRZ in south-eastern Australia.