The net water vapor flux is positive always, but its content is low about 21.88% than average state in dry year, and is high about 53.99% in wet year.

Do this test must be in a well-ventilated place, and to wear gloves, masks in case of water vapor and tin flux burns.

Although the water vapor convergence in the surface boundary layer is very important, the rainfall amount depends on the vertically integrated moisture flux convergence.