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.
So, as opposed to an individual storm, the monsoon is a specific season of the year. Here in Arizona, the monsoon is essentially a change in the weather pattern. We have winds that typically blow in from the west and southwest, keeping the state fairly dry. Around this time of year, however, the wind flow shifts.