US severe-weather alerts (NWS) API

Active U.S. National Weather Service alerts for a point (lat/lng) or a state: event, severity, urgency, area, headline, effective/expiry. Live official data (US-only). Answers 'any weather alerts here', 'severe weather warnings for CA', 'is there a storm warning at these coordinates'.

Price$0.01per request

MethodPOST

Route/v1/data/weather-alerts

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache300s public

dataweatheralertsnwssevere-weatherwarningsstormus

API URLhttps://x402.hexl.dev/v1/data/weather-alerts

Integration docs

Example request

{
  "area": "CA",
  "limit": 1
}

Example response

{
  "query": {
    "area": "CA"
  },
  "count": 1,
  "alerts": [
    {
      "event": "Heat Advisory",
      "severity": "Moderate",
      "urgency": "Expected",
      "area": "Central California",
      "headline": "Heat Advisory until 8 PM PDT",
      "effective": "2026-06-02T10:00:00-07:00",
      "expires": "2026-06-02T20:00:00-07:00"
    }
  ]
}

Input schema

{
  "type": "object",
  "properties": {
    "latitude": {
      "type": "number"
    },
    "longitude": {
      "type": "number"
    },
    "area": {
      "type": "string",
      "examples": [
        "CA"
      ]
    },
    "limit": {
      "type": "number",
      "default": 10
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}