# io.github.cyanheads/nws-weather-mcp-server (remote · nws.caseyjhand.com)

Get US weather forecasts, active alerts, and current observations.

- Trust score: 72/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `nws.caseyjhand.com`: 72/100 (this document), [markdown](https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws.md), [page](https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws)
- npm · `@cyanheads/nws-weather-mcp-server`: 35/100, [markdown](https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/cyanheads-nws-weather-mcp-server.md), [page](https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/cyanheads-nws-weather-mcp-server)

## Channel facts

- Endpoint: `https://nws.caseyjhand.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.7.2`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 66/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 7 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 82/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1357 tokens (~169/item across 8 items; 7 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http cyanheads-nws-weather-mcp-server https://nws.caseyjhand.com/mcp
```

### Codex

```toml
[mcp_servers.cyanheads-nws-weather-mcp-server]
url = "https://nws.caseyjhand.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cyanheads-nws-weather-mcp-server": {
      "type": "remote",
      "url": "https://nws.caseyjhand.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add cyanheads-nws-weather-mcp-server --url https://nws.caseyjhand.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  cyanheads-nws-weather-mcp-server:
    url: "https://nws.caseyjhand.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "cyanheads-nws-weather-mcp-server": {
      "type": "http",
      "url": "https://nws.caseyjhand.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-01 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 70, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 70, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 68, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 67)

First indexed and scored.

## MCP tools (7)

### `nws_get_forecast` (~114 tokens)

Nws Get Forecast

Get the weather forecast for a US location. Returns either named 12-hour periods (default) or hourly breakdowns.

Input parameters:

- `hourly` (boolean): If true, returns hourly forecast (next 48 one-hour periods) instead of 12-hour named periods (14 periods). Hourly includes dewpoint and relative humidity.
- `latitude` (number, required): Latitude in decimal degrees (e.g., 47.6062).
- `longitude` (number, required): Longitude in decimal degrees (e.g., -122.3321).

Output parameters:

- `generatedAt` (string): When the forecast was generated (ISO 8601)
- `location` (object): Resolved location metadata
- `mode` (string): Forecast mode: "hourly" or "7-day"
- `notice` (string): Set when upstream returned more periods than the cap — states how many periods were omitted.
- `periodCount` (number): Number of forecast periods returned (capped at 48).
- `periods` (array): Forecast periods
- `totalPeriodCount` (number): Total forecast periods available upstream before the cap was applied.

### `nws_search_alerts` (~356 tokens)

Nws Search Alerts

Search active weather alerts (watches, warnings, advisories) across the US. Filter by state, coordinates, zone, event type, severity, urgency, or certainty. area, point, and zone are mutually exclusive. Omit all filters for a national search.

Input parameters:

- `area` (string): US state/territory code (e.g., "WA", "OK", "PR") or marine area code (e.g., "GM"). Mutually exclusive with point and zone.
- `certainty` (array): Filter by certainty level.
- `event` (array): Filter to specific event types (e.g., ["Tornado Warning"]). Matches are case-insensitive and partial, so "tornado" matches both "Tornado Warning" and "Tornado Watch". Use nws_list_alert_types to disc…
- `limit` (integer): Maximum number of alerts to include in the response (1-25, default 25). totalCount still reports the full number of matches, so a small limit returns a digest of broad or national searches without dr…
- `point` (string): Coordinates as "lat,lon" (e.g., "47.6,-122.3"). Returns alerts whose geometry contains this point. Mutually exclusive with area and zone.
- `severity` (array): Filter by severity level.
- `status` (string): Alert status filter. Default "Actual". Use a different value only when you specifically need non-live alerts.
- `urgency` (array): Filter by urgency level.
- `zone` (string): NWS forecast zone (e.g., "WAZ558") or county zone (e.g., "WAC033"). Mutually exclusive with area and point.

Output parameters:

- `alerts` (array): Matching alerts (capped at the requested limit, max 25)
- `appliedFilters` (string): Summary of applied search filters
- `notice` (string): Guidance when no alerts matched — echoes applied filters and suggests how to broaden the search.
- `shownCount` (number): Number of alerts included in this response
- `totalCount` (number): Total number of matching alerts before the limit/cap is applied

### `nws_get_observations` (~123 tokens)

Nws Get Observations

Get current weather observations (actual measured conditions). Accepts coordinates (resolves nearest station automatically) or a station ID directly (e.g., "KSEA").

Input parameters:

- `latitude` (number): Latitude for automatic station resolution. Use with longitude. Ignored if station_id is provided.
- `longitude` (number): Longitude for automatic station resolution. Use with latitude. Ignored if station_id is provided.
- `station_id` (string): Station identifier directly (e.g., "KSEA", "KORD"). Use nws_find_stations to discover station IDs.

Output parameters:

- `barometricPressurePa`: Barometric pressure in Pascals
- `cloudLayers` (array): Cloud layer information
- `dewpointC`: Dewpoint in Celsius
- `heatIndexC`: Heat index in Celsius
- `notice` (string): Guidance when the latest observation is more than 2 hours old — data may not reflect current conditions.
- `observedAt` (string): Observation timestamp (ISO 8601)
- `relativeHumidityPct`: Relative humidity in percent (0-100)
- `station` (string): Station ID that served the observation (e.g., "KSEA")
- `stationId` (string): Observation station ID
- `stationName` (string): Station name
- `temperatureC`: Temperature in Celsius
- `textDescription` (string): Conditions summary (e.g., "Mostly Cloudy")
- `timeZone`: Station time zone when known
- `timestamp` (string): Observation time (ISO 8601)
- `visibilityM`: Visibility in meters
- `windChillC`: Wind chill in Celsius
- `windDirectionDeg`: Wind direction in degrees (0-360)
- `windGustKmh`: Wind gust in km/h
- `windSpeedKmh`: Wind speed in km/h

### `nws_find_stations` (~79 tokens)

Nws Find Stations

Find weather observation stations near a location. Returns stations sorted by proximity with distance and bearing. Use to discover station IDs for nws_get_observations.

Input parameters:

- `latitude` (number, required): Center latitude for proximity search.
- `limit` (integer): Max stations to return (1-50).
- `longitude` (number, required): Center longitude for proximity search.

Output parameters:

- `notice` (string): Guidance when no stations were found near the requested coordinates.
- `stations` (array): Nearby stations sorted by distance
- `totalCount` (number): Number of stations returned (respects the limit parameter)
- `totalFound` (number): Total observation stations available near this location before the limit was applied

### `nws_list_alert_types` (~45 tokens)

Nws List Alert Types

List all valid NWS alert event type names. Use to discover valid values for the event filter in nws_search_alerts, or to browse alert categories. No parameters required.

Output parameters:

- `count` (number): Number of event types
- `eventTypes` (array): Alert event type names sorted alphabetically

### `nws_get_office_discussion` (~267 tokens)

Nws Get Office Discussion

Get the latest narrative forecast product from a Weather Forecast Office (WFO). The default product is AFD (Area Forecast Discussion), which explains the meteorological reasoning behind the forecast — synoptic setup, model guidance, and forecaster confidence. Other types: HWO (Hazardous Weather Outlook, 1-7 day severe/flood/winter outlook), ZFP (Zone Forecast Product, zone-by-zone text), SPS (Special Weather Statement, short-fuse advisory). The office code is the 3-letter WFO identifier returned as the "office" field by nws_get_forecast.

Input parameters:

- `office` (string, required): Three-letter Weather Forecast Office (WFO) code (e.g., "SEW" for Seattle, "LOX" for Los Angeles). Returned as the "office" field in nws_get_forecast output.
- `product_type` (string): Product type code. AFD (Area Forecast Discussion) — meteorological reasoning, model analysis, forecaster confidence. HWO (Hazardous Weather Outlook) — 1-7 day outlook for severe weather, flooding, wi…

Output parameters:

- `issuanceTime` (string): When the product was issued (ISO 8601), e.g., "2026-05-30T10:33:00+00:00".
- `issuingOffice` (string): Issuing office call sign (e.g., "KSEW"). Includes the K/P prefix, unlike the input office code.
- `productCode` (string): Product type code (e.g., "AFD").
- `productName` (string): Full product name (e.g., "Area Forecast Discussion").
- `productText` (string): Full narrative product text as issued by the forecaster. AFDs are typically 1,000-3,000 words covering synoptic setup, model guidance, and period-by-period reasoning.
- `wmoCollectiveId` (string): WMO collective identifier (e.g., "FXUS66"). Identifies the product family in international message routing.

### `nws_get_zone_forecast` (~214 tokens)

Nws Get Zone Forecast

Get the text forecast for a public NWS forecast zone. Returns named forecast periods (e.g., "Today", "Tonight", "Monday") with detailed narrative text — the human-readable, zone-level forecast written by local forecasters. Completes the alert-to-forecast chain: nws_search_alerts returns zone codes in "affectedZones", and nws_find_stations returns them in the "forecastZone" column; use those codes here. Zone codes follow the pattern XXZ### (e.g., "WAZ315" for Western Washington lowlands). County zone codes (XXC###) are not supported — use the forecast zone code.

Input parameters:

- `zone_id` (string, required): NWS public forecast zone code (e.g., "WAZ315" for the Western Washington lowlands including Seattle). Returned as "forecastZone" by nws_get_forecast and nws_find_stations, or in "affectedZones" by nw…

Output parameters:

- `periodCount` (number): Number of forecast periods returned.
- `periods` (array): Forecast periods in chronological order, typically covering 7 days.
- `updated` (string): When the zone forecast was last updated (ISO 8601 with timezone offset).
- `zoneId` (string): Zone ID as provided (e.g., "WAZ315").

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws#diagnostics

## Score history

- 2026-08-03: 72
- 2026-08-02: 71
- 2026-08-01: 71
- 2026-07-31: 70
- 2026-07-30: 70
- 2026-07-29: 69
- 2026-07-28: 68
- 2026-07-27: 68
- 2026-07-26: 67

## Links

- Remote endpoint: https://nws.caseyjhand.com/mcp
- Repository: https://github.com/cyanheads/nws-weather-mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws/changelog.json
- HTML version of this page: https://verifymcp.io/servers/cyanheads-nws-weather-mcp-server/nws