Moi International Airport lies in the tropics at 4.03° S, 39.59° E, on Africa/Nairobi time (UTC+3). Tropical airports contend with heat and humidity, both of which thin the air and lengthen takeoff runs, and with convective storms that build fast in the afternoon.
Moi International Airport has 2 runways. The longest, 03/21, measures 10,991 ft by 151 ft, which puts the field in the long-haul capable category: widebodies operate comfortably, though the very longest sectors may need a payload trade. The surface is asphalt. 1 of the 2 carry runway lighting.
Runway 03/21 is aligned roughly north-east/south-west, which is the clearest hint you get about the prevailing wind here: runways are built to face the wind that blows most often, because aircraft take off and land into it. With 2 runways across 2 different headings, crews can pick whichever best suits the wind.
The runways are not interchangeable. 15/33 is 4,473 ft against 03/21's 10,991 ft, a difference of 6,518 ft, so the shorter one generally takes regional traffic while the longer handles anything heavy.