diff --git a/.gitattributes b/.gitattributes
index 9cb6f068500f3507b77bf0a5aa7077239daef313..56b3118dc0984c2c772f1c9111ddc60dd2ce3f9f 100644
--- a/.gitattributes
+++ b/.gitattributes
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diff --git a/2024-W20/.zattrs b/2024-W20/.zattrs
new file mode 100644
index 0000000000000000000000000000000000000000..b41c77861d64c0a4bee7ffd801d92741ced9fdd6
--- /dev/null
+++ b/2024-W20/.zattrs
@@ -0,0 +1,14 @@
+{
+  "id": "noaa-nbm-conus-forecast",
+  "title": "NOAA NBM CONUS Forecast (native cadence, lead hours 1-264)",
+  "description": "National Blend of Models (NBM) CONUS forecast, 00z cycle, stored at native forecast-step resolution on the native ~2.5 km Lambert conformal grid: hourly lead hours f001-f036, then 3-hourly through f264 (11 full days). Variables are step-level 2 m temperature, 1 h precipitation ending at the stored lead hour, downward shortwave radiation, and rolling TMAX/TMIN guidance when present.",
+  "version": "0.2.0",
+  "provider": "NOAA",
+  "model": "NBM",
+  "variant": "conus-forecast-native",
+  "valid_time_convention": "valid_time = init_time + lead_hour hours; lead_hour stores the actual forecast hours published in the public NBM core feed (hourly to f036, then 3-hourly to f264).",
+  "precip_semantics": "precip stores the deterministic 1 h APCP window ending at each stored lead hour; after f036 the archive is sampled every 3 h because intermediate forecast files do not exist in the public core feed.",
+  "source": "https://noaa-nbm-grib2-pds.s3.amazonaws.com/",
+  "license": "CC-BY-4.0 (derived); source NOAA NBM is public domain",
+  "attribution": "NOAA NBM via AWS Open Data; layout inspired by dynamical.org"
+}
\ No newline at end of file
diff --git a/2024-W20/.zgroup b/2024-W20/.zgroup
new file mode 100644
index 0000000000000000000000000000000000000000..cab13da6ee9f76aa1d91f6d4ba15fb726913efa8
--- /dev/null
+++ b/2024-W20/.zgroup
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diff --git a/2024-W20/.zmetadata b/2024-W20/.zmetadata
new file mode 100644
index 0000000000000000000000000000000000000000..69e54b401b3ffb477afaaf0fe5f2d45524bdc931
--- /dev/null
+++ b/2024-W20/.zmetadata
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new file mode 100644
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new file mode 100644
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--- /dev/null
+++ b/2024-W20/init_time/.zattrs
@@ -0,0 +1,9 @@
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+  "long_name": "Forecast initialization time",
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+  "calendar": "proleptic_gregorian",
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+  "standard_name": "latitude",
+  "units": "degrees_north",
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new file mode 100644
index 0000000000000000000000000000000000000000..99823a3381e930cec44655abfa682743ca2fe7f6
--- /dev/null
+++ b/2024-W20/y/.zarray
@@ -0,0 +1,21 @@
+{
+  "shape": [
+    1597
+  ],
+  "chunks": [
+    1597
+  ],
+  "dtype": "<f8",
+  "fill_value": "NaN",
+  "order": "C",
+  "filters": null,
+  "dimension_separator": ".",
+  "compressor": {
+    "id": "blosc",
+    "cname": "lz4",
+    "clevel": 5,
+    "shuffle": 1,
+    "blocksize": 0
+  },
+  "zarr_format": 2
+}
\ No newline at end of file
diff --git a/2024-W20/y/.zattrs b/2024-W20/y/.zattrs
new file mode 100644
index 0000000000000000000000000000000000000000..db7b3c6e400e5d501bdebdcb43403201a0677669
--- /dev/null
+++ b/2024-W20/y/.zattrs
@@ -0,0 +1,8 @@
+{
+  "units": "meters",
+  "long_name": "Y coordinate (Lambert conformal projection)",
+  "standard_name": "projection_y_coordinate",
+  "_ARRAY_DIMENSIONS": [
+    "y"
+  ]
+}
\ No newline at end of file
diff --git a/2024-W20/y/0 b/2024-W20/y/0
new file mode 100644
index 0000000000000000000000000000000000000000..a3254c1f7dc30ead68df178f055c5a9601907a80
Binary files /dev/null and b/2024-W20/y/0 differ