# NWS Active Severe Weather Alerts Feed

> NWS Active Severe Weather Alerts Feed is a paid API for AI agents from oracles-production.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns active NWS severe/extreme weather alert changes (tornado, hurricane, flood, winter storm, etc.) with area, urgency, certainty, effective/expiry times, and a 1-10 severity score

## Facts

- Endpoint: GET https://oracles-production.up.railway.app/v1/weather-alerts/changes
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nws-active-severe-weather-alerts-feed-c335845d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2dFVuX5CvYlXniaBfsmos

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nws-active-severe-weather-alerts-feed-c335845d
```

Example prompt: Pull all new NWS severe weather alerts since 2025-06-01T00:00:00Z with a significance score of at least 7 — I want to see tornado, hurricane, and major flood warnings, up to 50 results.

## When to prefer this

Use this endpoint when you need structured, scored, real-time NWS severe weather alert data with urgency/certainty metadata and change-tracking since a specific timestamp. Prefer it over general weather APIs when you need emergency-grade alert signals (tornado, hurricane, flood, winter storm) with a severity score for triage, or when building monitoring systems that poll for new high-severity alerts at regular intervals.

## Known failure modes

- Invalid date-time format for 'since' parameter returns a 400 validation error
- min_significance outside 1-10 range returns a 400 error
- limit outside 1-500 range returns a 400 error
- No active alerts matching filters returns an empty changes array with count 0
- Payment not provided or insufficient returns a 402 Payment Required response
- NWS upstream feed unavailable may return a 503 or stale data
- Network timeout on Railway infrastructure returns a 504

## How this service works

Active NWS severe/extreme weather alerts (tornado, hurricane, flood, winter storm…) with area, urgency, certainty, effective/expiry times, and a 1-10 severity score.

## Output

A JSON object containing a count of matching alerts, the data source identifier, and an array of alert change objects. Each change includes the alert type (e.g. TornadoWarning), a title, a detail object with area/urgency/certainty info, a plain-language summary, a unique entityId, a link to the primary NWS source for verification, the ISO-8601 timestamp when the change was detected, an integer severity score from 1-10, and the effective date of the alert.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 500,
       "minimum": 1
      },
      "since": {
       "type": "string",
       "format": "date-time",
       "description": "Only changes detected after this ISO-8601 instant"
      },
      "min_significance": {
       "type": "integer",
       "maximum": 10,
       "minimum": 1,
       "description": "Keep only changes scored at least this"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "count": {
       "type": "integer"
      },
      "source": {
       "type": "string"
      },
      "changes": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "type": {
          "type": "string"
         },
         "title": {
          "type": "string"
         },
         "detail": {
          "type": "object"
         },
         "summary": {
          "type": "string"
         },
         "entityId": {
          "type": "string"
         },
         "sourceUrl": {
          "type": [
           "string",
           "null"
          ],
          "description": "Primary-source link for verification"
         },
         "detectedAt": {
          "type": "string",
          "format": "date-time"
         },
         "significance": {
          "type": "integer",
          "maximum": 10,
          "minimum": 1
         },
         "effectiveDate": {
          "type": [
           "string",
           "null"
          ]
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nws-active-severe-weather-alerts-feed-c335845d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oracles-production.up.railway.app](https://www.zero.xyz/host/oracles-production.up.railway.app/llms.txt)