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Fixes for fire perimeter and smoke emissions from fire behavior model#3267

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Fixes for fire perimeter and smoke emissions from fire behavior model#3267
mkavulich wants to merge 2 commits into
ufs-community:developfrom
mkavulich:CFBM_and_RRFS_smoke_bugfixes

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@mkavulich

@mkavulich mkavulich commented Jun 18, 2026

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Commit Queue Requirements:

  • This PR addresses a relevant WM issue (if not, create an issue).
  • All subcomponent pull requests (if any) have been reviewed by their code managers.
  • Run the full Intel+GNU RT suite (compared to current baselines), preferably on Ursa (Derecho or Hercules are acceptable alternatives). Exceptions: documentation-only PRs, CI-only PRs, etc.
    • Commit log file w/full results from RT suite run (if applicable).
    • Verify that test_changes.list indicates which tests, if any, are changed by this PR. Commit test_changes.list, even if it is empty.
  • Transparency in the use of generative AI is required by NOAA policy. Was GenAI used in this work?
    • [Generative AI tool (insert name, if any)] was used to assist with developing this code. The code has been reviewed, edited, and validated by NWS staff.
  • Fill out all sections of this template.

Description:

This PR incorporates fixes in submodules for two separate problems affecting the Community Fire Behavior Model in UFS:

Unrealistic fire perimeters at long forecast times

Here is an example fire area from a 6-hour and 16-hour forecast prior to the introduction of the bug:
ncview fire_area_081400ncview fire_area_081410

This is the same simulated fire area with the current ufs-weather-model code:
ncview fire_area_081400ncview fire_area_081410

And this is the same forecast after the fix:
ncview fire_area_081400ncview fire_area_081410

Smoke emissions not persisting to subsequent timesteps

In the current UFS code the smoke emissions from the CFBM fire_behavior module do not persist in subsequent timesteps. Only a few instantaneous pixels of smoke can be seen in the first layer. This series of images shows smoke concentrations in the first layer at 3 h, 4 h, 5h and 6 h lead times using the current UFS weather model code:
image

After the fix, smoke now accumulates properly in the atmosphere over time:
image

Commit Message:

* UFSWM - Fixes for fire perimeter and smoke emissions from fire behavior model
  * UFSATM - Fixes for smoke emissions from fire behavior model
    * ccpp-physics - Fixes for smoke emissions from fire behavior model
  * fire_behavior Fixes for fire perimeter calculations

Priority:

  • High: Period of performance for this project ends in July

Git Tracking

UFSWM:

Sub component Pull Requests:

UFSWM Blocking Dependencies:

  • None

Documentation:

  • Documentation update NOT required.
    • Explanation: Bugfix only

Changes

Regression Test Changes (Please commit test_changes.list):

  • PR Updates/Changes Baselines.

Input data Changes:

  • None.

Library Changes/Upgrades:

  • No Updates

Testing Log:

  • RDHPCS
    • Orion
    • Hercules
    • GaeaC6
    • Derecho
    • Ursa
  • WCOSS2
    • Dogwood/Cactus
    • Acorn
  • CI
  • opnReqTest (complete task if unnecessary)

Testing Remarks:

@github-project-automation github-project-automation Bot moved this to Evaluating in PRs to Process Jun 18, 2026
@gspetro-NOAA gspetro-NOAA added Baseline Updates Current baselines will be updated. UFSATM There are changes to the UFSATM repository. CCPP There are changes to a CCPP repository. FB Fire behavior labels Jun 18, 2026
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Labels

Baseline Updates Current baselines will be updated. CCPP There are changes to a CCPP repository. FB Fire behavior UFSATM There are changes to the UFSATM repository.

Projects

Status: Evaluating

Development

Successfully merging this pull request may close these issues.

Problem with smoke emissions from fire_behavior model not persisting to subsequent timesteps

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