Add observation YAML and chronicle files for new snow observations

observation_chronicle/snow/t00z/snocvr_snomad.yaml

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+# Instrument metadata
+# -------------------
+commissioned: 2025-09-01T00:00:00
+
+observer_type: conventional  # Type of chronicle to use
+
+window_option: max
+
+# observation type initial configuration
+# --------------------------------
+stations_to_reject: [fakelist]
+
+# Chronicle of changes for this observation type
+# ----------------------------------------

observation_chronicle/snow/t00z/snomad.yaml

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+# Instrument metadata
+# -------------------
+commissioned: 2025-09-01T00:00:00
+
+observer_type: conventional  # Type of chronicle to use
+
+window_option: max
+
+# observation type initial configuration
+# --------------------------------
+stations_to_reject: [fakelist]
+
+# Chronicle of changes for this observation type
+# ----------------------------------------

observation_chronicle/snow/t06z/snocvr_snomad.yaml

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+# Instrument metadata
+# -------------------
+commissioned: 2025-09-01T00:00:00
+
+observer_type: conventional  # Type of chronicle to use
+
+window_option: max
+
+# observation type initial configuration
+# --------------------------------
+stations_to_reject: [fakelist]
+
+# Chronicle of changes for this observation type
+# ----------------------------------------

observation_chronicle/snow/t06z/snomad.yaml

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+# Instrument metadata
+# -------------------
+commissioned: 2025-09-01T00:00:00
+
+observer_type: conventional  # Type of chronicle to use
+
+window_option: max
+
+# observation type initial configuration
+# --------------------------------
+stations_to_reject: [fakelist]
+
+# Chronicle of changes for this observation type
+# ----------------------------------------

observations/snow/snocvr_snomad.yaml.j2

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+-
+
+  # Observation Space (I/O)
+  # -----------------------
+  obs space:
+    name: snocvr_snomad
+    obsdatain:
+      engine:
+        type: H5File
+        obsfile: "{{snow_prepobs_path}}/{{snow_obsdatain_prefix}}{{observation_from_jcb}}.tm00.nc"
+        missing file action: warn
+      obsgrouping:
+        group variables: [stationIdentification]
+    obsdataout:
+      engine:
+        type: H5File
+        obsfile: "{{snow_obsdataout_path}}/{{snow_obsdataout_prefix}}{{observation_from_jcb}}{{snow_obsdataout_suffix}}"
+    simulated variables: [totalSnowDepth]
+  #
+
+  # Observation Operator
+  # --------------------
+  obs operator:
+    name: Identity
+  #
+
+  # Observation Filters (QC)
+  # ------------------------
+  obs pre filters:
+    - filter: Create Diagnostic Flags
+      flags:
+      - name: missing_snowdepth
+        initial value: false
+      - name: missing_elevation
+        initial value: false
+      - name: temporal_thinning
+        initial value: false
+      - name: invalid_snowdepth
+        initial value: false
+      - name: invalid_elevation
+        initial value: false
+      - name: land_check
+        initial value: false
+      - name: landice_check
+        initial value: false
+      - name: seaice_check
+        initial value: false
+      - name: elevation_bkgdiff
+        initial value: false
+      - name: rejectlist
+        initial value: false
+      - name: background_check
+        initial value: false
+    - filter: Perform Action
+      filter variables:
+      - name: totalSnowDepth
+      action:
+        name: assign error
+        error parameter: 40.0
+    - filter: Domain Check
+      where:
+      - variable:
+          name: ObsValue/totalSnowDepth
+        value: is_valid
+      actions:
+      - name: set
+        flag: missing_snowdepth
+        ignore: rejected observations
+      - name: reject
+    - filter: Domain Check
+      where:
+      - variable:
+          name: MetaData/stationElevation
+        value: is_valid
+      actions:
+      - name: set
+        flag: missing_elevation
+        ignore: rejected observations
+      - name: reject
+    - filter: Temporal Thinning
+      min_spacing: '{{ window_length }}'
+      seed_time: '{{ snow_background_time_iso }}'
+      category_variable:
+        name: MetaData/stationIdentification
+      actions:
+      - name: set
+        flag: temporal_thinning
+        ignore: rejected observations
+      - name: reject
+  obs prior filters:
+    - filter: Bounds Check
+      filter variables:
+      - name: totalSnowDepth
+      minvalue: 0.0
+      maxvalue: 20000.0
+      actions:
+      - name: set
+        flag: invalid_snowdepth
+        ignore: rejected observations
+      - name: reject
+    - filter: Domain Check # land only
+      where:
+      - variable:
+          name: GeoVaLs/fraction_of_land
+        minvalue: 0.5
+      actions:
+      - name: set
+        flag: land_check
+        ignore: rejected observations
+      - name: reject
+    - filter: Domain Check
+      where:
+      - variable:
+          name: MetaData/stationElevation
+        minvalue: -200.0
+        maxvalue: 9900.0
+      actions:
+      - name: set
+        flag: invalid_elevation
+        ignore: rejected observations
+      - name: reject
+    - filter: Domain Check # land only, no sea ice
+      where:
+      - variable:
+          name: GeoVaLs/fraction_of_ice
+        maxvalue: 0.0
+      actions:
+      - name: set
+        flag: seaice_check
+        ignore: rejected observations
+      - name: reject
+    - filter: RejectList  # no land-ice
+      where:
+      - variable:
+          name: GeoVaLs/vtype
+        minvalue: 14.5
+        maxvalue: 15.5
+      actions:
+      - name: set
+        flag: landice_check
+        ignore: rejected observations
+      - name: reject
+    - filter: Difference Check # elevation check
+      reference: MetaData/stationElevation
+      value: GeoVaLs/filtered_orography
+      threshold: 800.
+      actions:
+      - name: set
+        flag: elevation_bkgdiff
+        ignore: rejected observations
+      - name: reject
+    # Add inflate error characterized by a function of elevation difference
+    - filter: Variable Assignment
+      assignments:
+      - name: DerivedMetaData/elevation_diff
+        type: float
+        function:
+          name: ObsFunction/Arithmetic
+          options:
+            variables: [MetaData/stationElevation, GeoVaLs/filtered_orography]
+            coefficients: [1., -1.]
+            total exponent: 2
+            total coefficient: 0.0000015625  #1/(800*800)
+    - filter: Variable Assignment
+      assignments:
+      - name: DerivedMetaData/elevation_diff_exp
+        type: float
+        function:
+          name: ObsFunction/Exponential
+          options:
+            variables: [DerivedMetaData/elevation_diff]
+            coeffA: 1.
+            coeffB: -1.
+            coeffC: 0.
+            coeffD: 1.
+    - filter: Variable Assignment
+      assignments:
+      - name: DerivedMetaData/elevation_diff_exp_inv
+        type: float
+        function:
+          name: ObsFunction/Arithmetic
+          options:
+            variables: [DerivedMetaData/elevation_diff_exp]
+            total exponent: -1.
+    - filter: Perform Action
+      filter variables:
+      - name: totalSnowDepth
+      where:
+      - variable:
+          name: ObsValue/totalSnowDepth
+        minvalue: 0.
+      action:
+        name: inflate error
+        inflation variable: DerivedMetaData/elevation_diff_exp_inv # 2.0
+    - filter: BlackList
+      where:
+      - variable:
+          name: MetaData/stationIdentification
+        is_in: {{ get_conventional_rejected_stations(observation_from_jcb) }}
+      actions:
+      - name: set
+        flag: rejectlist
+        ignore: rejected observations
+      - name: reject
+  obs post filters:
+    - filter: Background Check # gross error check
+      filter variables:
+      - name: totalSnowDepth
+      absolute threshold: 250
+      bias correction parameter: 1.0
+      actions:
+      - name: set
+        flag: background_check
+        ignore: rejected observations
+      - name: reject
+