Combined with the projected increase in precipitable water, resulting precipitation magnitude would increase. Often abbreviated as "TPW" = total precipitable water. This is also referred to as "total precipitable water vapour". Those with heavy rainfall normally have precipitable water values greater than . A broad swath of ample precipitable water, or atmospheric moisture, extended across this region. As a depth, the precipitable water is measured in millimeters or inches. Unusually high precipitable water values of were present over the island as Erika moved through. Precipitable water values of greater than favor the development of organized thunderstorm complexes.