The Hawaiian Orographic Precipitation Model is updated twice daily and provides 24 hours of operational output.
Orographic Vertical Motion
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Orographic Rainfall Index
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The orographic vertical motion is calculated using the horizontal winds (from WRF)
and the gradient of the mountain. It is calculated on a 0.0005 x 0.0005 degree
grid. Includes average w, Froude number, LCL height, and inversion height.
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The orographic rainfall index is found by combining the high-resolution
orographic vertical motion with the total column precipitable water from the WRF model.
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Orographic Precipitation Enhancement
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Total Hourly Precipitation
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Orographic precipitation enhancement is calculated by combining the orographic
vertical motion and simple microphysics in the cloud to see how much moisture
flux is input into the cloud over an hour and converted into precipitation
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The precipitation combines the orographic precipitation enhancement with preexisting
hydrometeor conditions in the atmosphere to determine how much precipitation is
occuring
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