The Commonwealth player is allowed to bomb these convoys from Malta either abstractly, or with airpower using the optional air game rules. After bombing, the Axis player gets to put what supply is left into the Tripoli box. The Commonwealth player receives unlimited supply from Cairo. The logistical problem of getting the supply to the combat units, however, is left as an exercise for the players. The initiative player is given the duty of rolling for weather.
Hot weather makes it a bit harder to move for foot-infantry and makes for harsher attrition results.
Sandstorms and Rain Squalls, which are localized phenomena, can also be invoked - but only through a random event. As one would expect, these severe weather occurrences have an even greater impact on a unit's ability to perform. The TCT system integrates BOTH players' moves and combat into one phase, such that moving and fighting actually become a series of actions and reactions. Before rolling the dice, a table of modifiers is consulted. These modifiers run the gamut from units being out of supply, to being out of range of a commander or HQ, disruption, etc.