Causes. Although doctors don't know what causes ITP, they know that it happens when your immune system -- your body's defense against disease -- doesn't work right. Your antibodies, which are supposed to attack infections, instead mistakenly destroy your blood platelets.
Although not as strong as the Asian monsoon, the cycle is typical of monsoon seasons worldwide. The monsoon season begins on June 15 and ends on September 30, but the storms peak between mid-July and mid-August. On average, about half of Arizona receives about half of its annual rainfall during the monsoon. However, rainfall can vary tremendously between distances of just a few miles.
Arizona and New Mexico receive up to half of their annual precipitation during the monsoon season. The monsoonâs wild winds and driving rains are most dramatic in Tucson and in western New Mexico, tapering off in Phoenix and Yuma (Figure 1). On average, the monsoon delivers approximately 6.1 inches of rain a year to Tucson compared to 2.8 inches to Phoenix. But the monsoon is variable.