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1. Precipitable water:
Precipitable water is the amount of water that would fall to the surface if all moisture in the atmosphere were brought down to the surface. The value can be found by either finding the data from a Skew-T or located a precipitable water chart. Precipitable water values less than 0.75 inches are considered relatively low while greater than 1.5 relatively high. The value must be compared with the climatology of a region. A vegetated region will support higher values of precipitable water than a semi-desert region. Precipitable water should not be used to predict an exact rain total since moisture convergence can enhance the amount of moisture that has the potential to fall over an area. Higher PW values are maximized when surface dewpoints are high and the atmosphere is near saturation through a large depth of the atmosphere. Often the precipitable water value will be given with a percent of climatology value. If the percent of climatology value is above 150%, this is an indication heavy prolonged rain will produce flooding in that region.
Βy METEOROLOGIST JEFF HABY
http://www.theweatherprediction.com/heavyrain/
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Precipitable water is the amount of water that would fall to the surface if all moisture in the atmosphere were brought down to the surface. The value can be found by either finding the data from a Skew-T or located a precipitable water chart. Precipitable water values less than 0.75 inches are considered relatively low while greater than 1.5 relatively high. The value must be compared with the climatology of a region. A vegetated region will support higher values of precipitable water than a semi-desert region. Precipitable water should not be used to predict an exact rain total since moisture convergence can enhance the amount of moisture that has the potential to fall over an area. Higher PW values are maximized when surface dewpoints are high and the atmosphere is near saturation through a large depth of the atmosphere. Often the precipitable water value will be given with a percent of climatology value. If the percent of climatology value is above 150%, this is an indication heavy prolonged rain will produce flooding in that region.
Βy METEOROLOGIST JEFF HABY
http://www.theweatherprediction.com/heavyrain/
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