banding in Grid Diag 2d pdf of precip vs column water vapor

[dwfncar]

Describe the New Feature

There is banding in Grid Diag 2d pdf of precip vs column water vapor

The precip variable appears to be clustering around certain values.

Interchanging precip and CWV in config dictionary reverses variable order
as expected but does change pdf distribution.

It would be good to more fully test this tools using additional fields (850 temp, 500mb hgt, 250mb wind)

It would also be good to test on a different dataset to determine if it's the current test precip that's the problem.

Acceptance Testing

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Describe tests required for new functionality.

Time Estimate

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Issues should represent approximately 1 to 3 days of work.
Larger issues should be broken down into sub-issues.

Relevant Deadlines

Should be done by sometime in May

Funding Source

7790971

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banding in Grid Diag 2d pdf of precip vs column water vapor

precip variable appears to be clustering around certain values.
Interchanging precip and CWV in config dictionary reverses variable order
as expected but does change pdf distribution.

[michelleharrold]

Tested 24-h accumulated precip and PWAT (at day 5/120 h fcst). In testing, the suggested ranges and bins were modified, which yielded more appropriate results. The output from the grid-diag tool was plotted to ensure the banding issue was resolved. Testing revealed no problems in the code, but updates were made to (1) apply the mask before computing data min/max values and (2) keeping track of those min/max values over the entire series.