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Bug fix for HRRR IFI: Use ifi_apcp if it is 0 #1127

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SamuelTrahanNOAA
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This is the bug fix described in detail here:

It corrects a bug in how accumulated hourly precipitation is sent to IFI from within UPP.

I've tested it with the regression tests in this branch:

With these changes, the HRRR UPP IFI and standalone IFI match, which they don't in develop now.

@WenMeng-NOAA WenMeng-NOAA added the bug Something isn't working label Feb 21, 2025
@SamuelTrahanNOAA
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This PR is expected to change IFI results due to the bugfix in IFI.F

It is not expected to change results of other tests. Also, it shouldn't change results of the "ifi missing" tests.

@SamuelTrahanNOAA
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My tests produce a change I don't expect:

.../upp-HERA/rap_2020072316_pe_test/WRFPRS.GrbF16.diff:1:708:195559853:CDCON:convective cloud layer:rpn_corr=-nan:rpn_rms=undefined

There are no commits in this PR which should change the result of the rap_2020072316_pe_test

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IFI.F can use junk values for hourly accumulated precipitation
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