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Bug fix in UDM MP#2365

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wrf-model:masterfrom
Songyou184:WDM7-4.8.1
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Bug fix in UDM MP#2365
Songyou184 wants to merge 1 commit into
wrf-model:masterfrom
Songyou184:WDM7-4.8.1

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The first line should be a single-line "purpose" for this change

TYPE: Bug fix

KEYWORDS: Prevent artificial rain accumulation

SOURCE: songyou hong

DESCRIPTION OF CHANGES:
Problem:
UDM MP occasionally produces unphysical rain activities

Solution:
Allow tiny values of rain drops (qr < 1.e-9) to be sedimented

LIST OF MODIFIED FILES: module_mp_udm.F

TESTS CONDUCTED:

  1. Ming Chen confirmed that this PR fixes the issue in 4.8 UDM MP
  2. Are the Jenkins tests all passing?

RELEASE NOTE:

@Songyou184 Songyou184 requested a review from a team as a code owner July 13, 2026 22:19
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