Update files to run v17p8_ugwpv1_c3_mynn experiment in realtime

[kayeekayee]

Description

• effective 00Z 10Mar24
• dt_inner change to 75 effective 00Z 19Mar24
• add experiment directory, rt_v17p8_ugwpv1_c3_mynn

Type of change

• Bug fix
• New feature

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

Hera

Checklist

• [ x] Any dependent changes have been merged and published
• [x ] My code follows the style guidelines of this project
• [ x] I have performed a self-review of my own code
• [x ] I have commented my code, particularly in hard-to-understand areas
• [ x] My changes generate no new warnings
• [ x] New and existing tests pass with my changes
• [ x] I have made corresponding changes to the documentation if necessary

[github-advanced-security]

shellcheck found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.

[jderrico-noaa]

These changes have been incorporated into PR #51