{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:WI4D2LJNXUICQEK53FDBE6B4N4","short_pith_number":"pith:WI4D2LJN","canonical_record":{"source":{"id":"2508.18486","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2025-08-25T20:55:46Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"6429bb0ccf33d0c1fc6d12a01ca185a6e0ba986d98d3df7a05ca33271203c18b","abstract_canon_sha256":"9dc4f4ed2892c960c05b04a11ab12e1f51f669498e195d7b153d0bf969d1331e"},"schema_version":"1.0"},"canonical_sha256":"b2383d2d2dbd1028115dd94612783c6f1f97c28d4f971c43ed3f5b7855fc5597","source":{"kind":"arxiv","id":"2508.18486","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.18486","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"arxiv_version","alias_value":"2508.18486v2","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.18486","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_12","alias_value":"WI4D2LJNXUIC","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_16","alias_value":"WI4D2LJNXUICQEK5","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_8","alias_value":"WI4D2LJN","created_at":"2026-06-26T00:15:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:WI4D2LJNXUICQEK53FDBE6B4N4","target":"record","payload":{"canonical_record":{"source":{"id":"2508.18486","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2025-08-25T20:55:46Z","cross_cats_sorted":["cs.LG"],"title_canon_sha256":"6429bb0ccf33d0c1fc6d12a01ca185a6e0ba986d98d3df7a05ca33271203c18b","abstract_canon_sha256":"9dc4f4ed2892c960c05b04a11ab12e1f51f669498e195d7b153d0bf969d1331e"},"schema_version":"1.0"},"canonical_sha256":"b2383d2d2dbd1028115dd94612783c6f1f97c28d4f971c43ed3f5b7855fc5597","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-26T00:15:22.509344Z","signature_b64":"yblSUd3mdvCmuBHmyK5tmcKVMFYaIHqcqf7FAvXomYKqBc52+9mxqx9L26+NX2ANSpyXHnt+R447YKmtJh9uDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b2383d2d2dbd1028115dd94612783c6f1f97c28d4f971c43ed3f5b7855fc5597","last_reissued_at":"2026-06-26T00:15:22.508716Z","signature_status":"signed_v1","first_computed_at":"2026-06-26T00:15:22.508716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2508.18486","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-26T00:15:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R6Uxj9B/9b3DU2u2yN6VAc/d2JjdpOt8jXVhNcsuQCi1zFPtGqyn+gA+rwD00F9wOtpIw5+fMyQDwV1XRV7zBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T07:26:59.392270Z"},"content_sha256":"9250eaf5777906728c1381d2a105005da123c08f13f17d7fc207f78ddf0e8418","schema_version":"1.0","event_id":"sha256:9250eaf5777906728c1381d2a105005da123c08f13f17d7fc207f78ddf0e8418"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:WI4D2LJNXUICQEK53FDBE6B4N4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Huracan: A skillful end-to-end data-driven system for ensemble data assimilation and weather prediction","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.LG"],"primary_cat":"physics.ao-ph","authors_text":"Haiyu Dong, Hang Zhang, Hongyu Sun, Jiang Bian, Jonathan Weyn, Kit Thambiratnam, Qi Zhang, Weixin Jin, Yanfei Xiang, Zekun Ni","submitted_at":"2025-08-25T20:55:46Z","abstract_excerpt":"Over the past few years, machine learning-based data-driven weather prediction has been transforming operational weather forecasting by providing more accurate forecasts while using a mere fraction of computing power compared to traditional numerical weather prediction (NWP). However, those models still rely on initial conditions from NWP, putting an upper limit on their forecast abilities. A few end-to-end systems have since been proposed, but they have yet to match the forecast skill of state-of-the-art NWP competitors. In this work, we propose Huracan, an observation-driven weather forecast"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18486","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2508.18486/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-26T00:15:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"txNAA0vTQys0f75dcxBk/E4OunBWkPPCi7Hb2eEE/p2e/J9RDtq7T2HooInPdCOnrGQbgeAd6GiCsN7ov+jRAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T07:26:59.392662Z"},"content_sha256":"5c098a58a36de914ce91ee6c117572d81b16443ede881fc244f4ae70838ab1dd","schema_version":"1.0","event_id":"sha256:5c098a58a36de914ce91ee6c117572d81b16443ede881fc244f4ae70838ab1dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WI4D2LJNXUICQEK53FDBE6B4N4/bundle.json","state_url":"https://pith.science/pith/WI4D2LJNXUICQEK53FDBE6B4N4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WI4D2LJNXUICQEK53FDBE6B4N4/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-28T07:26:59Z","links":{"resolver":"https://pith.science/pith/WI4D2LJNXUICQEK53FDBE6B4N4","bundle":"https://pith.science/pith/WI4D2LJNXUICQEK53FDBE6B4N4/bundle.json","state":"https://pith.science/pith/WI4D2LJNXUICQEK53FDBE6B4N4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WI4D2LJNXUICQEK53FDBE6B4N4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:WI4D2LJNXUICQEK53FDBE6B4N4","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"9dc4f4ed2892c960c05b04a11ab12e1f51f669498e195d7b153d0bf969d1331e","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2025-08-25T20:55:46Z","title_canon_sha256":"6429bb0ccf33d0c1fc6d12a01ca185a6e0ba986d98d3df7a05ca33271203c18b"},"schema_version":"1.0","source":{"id":"2508.18486","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.18486","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"arxiv_version","alias_value":"2508.18486v2","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.18486","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_12","alias_value":"WI4D2LJNXUIC","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_16","alias_value":"WI4D2LJNXUICQEK5","created_at":"2026-06-26T00:15:22Z"},{"alias_kind":"pith_short_8","alias_value":"WI4D2LJN","created_at":"2026-06-26T00:15:22Z"}],"graph_snapshots":[{"event_id":"sha256:5c098a58a36de914ce91ee6c117572d81b16443ede881fc244f4ae70838ab1dd","target":"graph","created_at":"2026-06-26T00:15:22Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2508.18486/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Over the past few years, machine learning-based data-driven weather prediction has been transforming operational weather forecasting by providing more accurate forecasts while using a mere fraction of computing power compared to traditional numerical weather prediction (NWP). However, those models still rely on initial conditions from NWP, putting an upper limit on their forecast abilities. A few end-to-end systems have since been proposed, but they have yet to match the forecast skill of state-of-the-art NWP competitors. In this work, we propose Huracan, an observation-driven weather forecast","authors_text":"Haiyu Dong, Hang Zhang, Hongyu Sun, Jiang Bian, Jonathan Weyn, Kit Thambiratnam, Qi Zhang, Weixin Jin, Yanfei Xiang, Zekun Ni","cross_cats":["cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2025-08-25T20:55:46Z","title":"Huracan: A skillful end-to-end data-driven system for ensemble data assimilation and weather prediction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.18486","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9250eaf5777906728c1381d2a105005da123c08f13f17d7fc207f78ddf0e8418","target":"record","created_at":"2026-06-26T00:15:22Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"9dc4f4ed2892c960c05b04a11ab12e1f51f669498e195d7b153d0bf969d1331e","cross_cats_sorted":["cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ao-ph","submitted_at":"2025-08-25T20:55:46Z","title_canon_sha256":"6429bb0ccf33d0c1fc6d12a01ca185a6e0ba986d98d3df7a05ca33271203c18b"},"schema_version":"1.0","source":{"id":"2508.18486","kind":"arxiv","version":2}},"canonical_sha256":"b2383d2d2dbd1028115dd94612783c6f1f97c28d4f971c43ed3f5b7855fc5597","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b2383d2d2dbd1028115dd94612783c6f1f97c28d4f971c43ed3f5b7855fc5597","first_computed_at":"2026-06-26T00:15:22.508716Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-26T00:15:22.508716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yblSUd3mdvCmuBHmyK5tmcKVMFYaIHqcqf7FAvXomYKqBc52+9mxqx9L26+NX2ANSpyXHnt+R447YKmtJh9uDA==","signature_status":"signed_v1","signed_at":"2026-06-26T00:15:22.509344Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.18486","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9250eaf5777906728c1381d2a105005da123c08f13f17d7fc207f78ddf0e8418","sha256:5c098a58a36de914ce91ee6c117572d81b16443ede881fc244f4ae70838ab1dd"],"state_sha256":"9bbdf168d19bab11aa6d34d71518b796d035446f57f23f39eca961e4bf217dbd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2MA2+e4MvonWQqgCcqfVPMN208QvNo98ykrcA6to00mul5XtEF3ihvfAEQco4inLCe3oz89opWTOS87VT3U6CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T07:26:59.395038Z","bundle_sha256":"e532ba51e98749ce34d7b4666f4fb2a674dc7f658652e5eb1ab24cdf022da106"}}