METARs, TAFs, PIREPs, domestic/international SIGMETs and CWAs via NWS AWC. AIRMETs not served.
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Resolve an airport or weather reporting station by its identifier, or discover stations within a bounding box or US state. Returns all identifier variants (ICAO/IATA/FAA), coordinates, elevation, and available data types (METAR, TAF, SYNOP, etc.). A lookup matches the registry's own identifier, which for an airport is its 4-character ICAO ID (e.g., KSEA, KJFK, K0S9); buoys and mesonet sites carry identifiers of other shapes and resolve by those. At least one of station_ids, bbox, or state is required. limit bounds how many stations an area search returns without changing the area searched, and belongs to the bbox and state modes only.
Geographic bounding box for spatial queries.
Maximum stations to return, applied after ordering by ICAO identifier ascending with identifier-less stations last — so the same query with the same limit returns the same stations, and airports rather than unidentified sites lead the first page. It bounds the response without changing the area searched, which a smaller bbox or a different state would. Distinct from the 400-row upstream cap: a limited result examined every station it counted and withheld some, while a capped one never drew the rest. Belongs to the bbox and state modes; supplying it alongside station_ids is rejected, since that mode already names the set. Omit to return every match. Optional.
Two-letter USPS code for one of the 50 US states or DC (e.g., "WA") to list all stations in that jurisdiction. US territories are not supported — use bbox for those.
One or more station identifiers (e.g., KSEA, KJFK). A lookup matches the registry's own identifier: a 4-character ICAO ID for an airport (e.g., KSEA, K0S9), and other shapes for the buoys and mesonet sites the registry also carries, which resolve by those. A 3-letter IATA code (e.g., SEA) never resolves, even for a station whose entry carries one. Whitespace around an entry is trimmed, so a padded identifier resolves the same as the bare one; an empty or whitespace-only entry is rejected. Use bbox or state to discover identifiers by location.
Resolve an airport or weather reporting station by its identifier, or discover stations within a bounding box or US state. Returns all identifier variants (ICAO/IATA/FAA), coordinates, elevation, and available data types (METAR, TAF, SYNOP, etc.). A lookup matches the registry's own identifier, which for an airport is its 4-character ICAO ID (e.g., KSEA, KJFK, K0S9); buoys and mesonet sites carry identifiers of other shapes and resolve by those. At least one of station_ids, bbox, or state is required. limit bounds how many stations an area search returns without changing the area searched, and belongs to the bbox and state modes only.
| Argument | Type | Description |
|---|---|---|
| bbox | object | Geographic bounding box for spatial queries. |
| limit | integer | Maximum stations to return, applied after ordering by ICAO identifier ascending with identifier-less stations last — so the same query with the same limit returns the same stations, and airports rather than unidentified sites lead the first page. It bounds the response without changing the area searched, which a smaller bbox or a different state would. Distinct from the 400-row upstream cap: a limited result examined every station it counted and withheld some, while a capped one never drew the rest. Belongs to the bbox and state modes; supplying it alongside station_ids is rejected, since that mode already names the set. Omit to return every match. Optional. |
| state | string | Two-letter USPS code for one of the 50 US states or DC (e.g., "WA") to list all stations in that jurisdiction. US territories are not supported — use bbox for those. |
| station_ids | array | One or more station identifiers (e.g., KSEA, KJFK). A lookup matches the registry's own identifier: a 4-character ICAO ID for an airport (e.g., KSEA, K0S9), and other shapes for the buoys and mesonet sites the registry also carries, which resolve by those. A 3-letter IATA code (e.g., SEA) never resolves, even for a station whose entry carries one. Whitespace around an entry is trimmed, so a padded identifier resolves the same as the bare one; an empty or whitespace-only entry is rejected. Use bbox or state to discover identifiers by location. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"bbox": {
"type": "object",
"required": [
"minLat",
"minLon",
"maxLat",
"maxLon"
],
"properties": {
"maxLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Northern boundary latitude in decimal degrees."
},
"maxLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Eastern boundary longitude in decimal degrees."
},
"minLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Southern boundary latitude in decimal degrees."
},
"minLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Western boundary longitude in decimal degrees."
}
},
"description": "Geographic bounding box for spatial queries."
},
"limit": {
"type": "integer",
"maximum": 400,
"minimum": 1,
"description": "Maximum stations to return, applied after ordering by ICAO identifier ascending with identifier-less stations last — so the same query with the same limit returns the same stations, and airports rather than unidentified sites lead the first page. It bounds the response without changing the area searched, which a smaller bbox or a different state would. Distinct from the 400-row upstream cap: a limited result examined every station it counted and withheld some, while a capped one never drew the rest. Belongs to the bbox and state modes; supplying it alongside station_ids is rejected, since that mode already names the set. Omit to return every match. Optional."
},
"state": {
"type": "string",
"maxLength": 2,
"minLength": 2,
"description": "Two-letter USPS code for one of the 50 US states or DC (e.g., \"WA\") to list all stations in that jurisdiction. US territories are not supported — use bbox for those."
},
"station_ids": {
"type": "array",
"items": {
"type": "string",
"pattern": "\\S",
"description": "One station identifier (e.g., KSEA)."
},
"maxItems": 20,
"minItems": 1,
"description": "One or more station identifiers (e.g., KSEA, KJFK). A lookup matches the registry's own identifier: a 4-character ICAO ID for an airport (e.g., KSEA, K0S9), and other shapes for the buoys and mesonet sites the registry also carries, which resolve by those. A 3-letter IATA code (e.g., SEA) never resolves, even for a station whose entry carries one. Whitespace around an entry is trimmed, so a padded identifier resolves the same as the bare one; an empty or whitespace-only entry is rejected. Use bbox or state to discover identifiers by location."
}
},
"additionalProperties": false
}Get active domestic SIGMETs, international SIGMETs (including oceanic products), and Center Weather Advisories from the NWS Aviation Weather Center. Filter by advisory_type, hazard, or ordered bbox. Returns source coverage, decoded hazards/altitudes/movement, multipart geometry, and original bulletins; missing facts stay null. Independent source failures retain healthy results with partial coverage. AIRMET requests are rejected; this tool does not retrieve AIRMETs. Omit limit to return every available match; an explicit limit sorts results and discloses withheld matches.
| Argument | Type | Description |
|---|---|---|
| bbox | object | Ordered geographic bounding box. Matches each geometry part by its bounding envelope, not exact polygon intersection; date-line-crossing source geometry is unwrapped. |
| limit | integer | Optional maximum matches to return, without a default or automatic cap. Sorts by source, issuer, series and validity; omit or raise it to retrieve withheld matches. |
| hazard | string | Upstream hazard filter. Domestic: CONVECTIVE, TURBULENCE, ICING, IFR. International: TS, TURBULENCE, ICING, MTW (mountain wave), DS (duststorm), SS (sandstorm), TC (tropical cyclone), VA (volcanic ash). CWA: TS, TURBULENCE, ICING, IFR, PCPN (precipitation), UNK (unknown). Incompatible sources are not_applicable; wholly incompatible selections are rejected. MTN OBSCN, SURFACE WIND and LLWS are not served and are rejected. A hazard-scoped zero says nothing about other hazards. |
| advisory_type | string | Product selection: sigmet is domestic SIGMETs, isigmet is international SIGMETs, cwa is Center Weather Advisories, and all reads all three independently. airmet is rejected with guidance to separate AIRMET products. |
Get current weather observations (METARs) for named airports, or survey every reporting station inside a geographic area. Returns decoded fields — wind direction/speed/gusts, visibility, ceiling with its kind (measured, or indefinite for vertical visibility into an obscuration), present weather, temperature, dewpoint, altimeter, cloud layers — plus the computed flight category (VFR/MVFR/IFR/LIFR) and the raw METAR string. Requires either station_ids (1–10 ICAO IDs, e.g., KSEA, KJFK, K0S9) or bbox (area survey) — not both. station_ids returns every observation inside the hours window; bbox returns the latest observation per station in the box, with flight_category keeping only the stations in the categories named (e.g., IFR and LIFR) and limit bounding how many stations come back. Use aviation_find_stations to resolve or verify an ICAO ID, or to discover nearby stations.
| Argument | Type | Description |
|---|---|---|
| bbox | object | Geographic bounding box for an area observation survey. |
| hours | integer | Lookback window in hours (1–12), not a row limit. With station_ids every observation inside the window is returned, so a station reporting more often than hourly yields more than one row per hour: at the default of 1, half-hourly stations return two observations and SPECI-issuing stations can return more, so budget rows by the station reporting interval, never one per station. With bbox the result is reduced to the latest observation per station, but the window still shapes the draw the upstream row cap applies to — a wide window spends that cap on repeat readings from busy stations instead of on more stations, so lower it before narrowing the box. |
| limit | integer | Maximum stations to return, applied after the draw is reduced to the latest observation per station, after any flight_category filter, and ordered by station ID ascending — so the same query with the same limit returns the same stations. It bounds the response without changing the area searched, which a smaller bbox would, and it keeps an alphabetical slice rather than a region or a condition. Distinct from the 400-row upstream cap: a limited result examined every station it counted and withheld some, while a capped one never drew the rest. Belongs to the bbox mode; supplying it alongside station_ids is rejected, since that mode already names the set. Omit to return every station in the box. Optional. |
Get recent Pilot Reports (PIREPs) near an airport or within a bounding box. Returns decoded turbulence, icing, and cloud reports with altitude, aircraft type, intensity, outside air temperature, wind aloft, flight weather, and the raw PIREP string. Requires either station_id (ICAO center point for radial search, e.g., KSEA) or bbox (area search) — not both. distance_nm belongs to the station_id search only, and altitude_min_ft must not exceed altitude_max_ft. min_intensity restricts the result to reports carrying a turbulence or icing layer at that intensity or above. limit bounds how many reports come back without changing what is searched, keeping the most recent. Coverage is US-centric; PIREPs are sparse and absence of reports does not imply smooth conditions.
| Argument | Type | Description |
|---|---|---|
| bbox | object | Geographic bounding box for area PIREP search. |
| hours | integer | How many hours of history to return. Default 3. |
| limit | integer | Maximum reports to return, applied last — after every filter and after ordering by observation time descending, so a limited result is the most recent reports rather than an arbitrary slice. It bounds the response without changing what is searched, which every other parameter does. Distinct from the 400-row upstream cap: a limited result examined every report it counted and withheld some, while a capped one never drew the rest. Selection is by recency alone, so pair it with min_intensity to bound a result by severity. Omit to return every match. Optional. |
| station_id | string | ICAO station ID as center point for radial search — 4 ASCII letters or digits, case-insensitive and normalized to uppercase (e.g., KSEA, K0S9). Use with distance_nm. |
Get the Terminal Aerodrome Forecast (TAF) for one or more airports. Returns each forecast period with valid times, surface wind, low-level wind shear, visibility, decoded weather conditions, cloud layers, and the vertical visibility into a forecast obscuration, plus the raw TAF string. TAFs cover the next 24–30 hours and are issued only for airports with scheduled commercial service; check data_types from aviation_find_stations to confirm TAF availability. Accepts 1–4 ICAO station IDs (e.g., KSEA, KJFK, K36U).
| Argument | Type | Description |
|---|---|---|
| station_ids* | array | ICAO station IDs to query. 1–4 stations per call. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"station_ids"
],
"properties": {
"station_ids": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[A-Za-z0-9]{4}$",
"description": "ICAO station ID: 4 ASCII letters or digits, case-insensitive and normalized to uppercase (e.g., KSEA, KJFK, K36U)."
},
"maxItems": 4,
"minItems": 1,
"description": "ICAO station IDs to query. 1–4 stations per call."
}
},
"additionalProperties": false
}{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"bbox": {
"type": "object",
"required": [
"minLat",
"minLon",
"maxLat",
"maxLon"
],
"properties": {
"maxLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Northern boundary latitude in decimal degrees."
},
"maxLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Eastern boundary longitude in decimal degrees."
},
"minLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Southern boundary latitude in decimal degrees."
},
"minLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Western boundary longitude in decimal degrees."
}
},
"description": "Ordered geographic bounding box. Matches each geometry part by its bounding envelope, not exact polygon intersection; date-line-crossing source geometry is unwrapped."
},
"limit": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": 1,
"description": "Optional maximum matches to return, without a default or automatic cap. Sorts by source, issuer, series and validity; omit or raise it to retrieve withheld matches."
},
"hazard": {
"enum": [
"CONVECTIVE",
"TURBULENCE",
"ICING",
"IFR",
"TS",
"MTW",
"DS",
"SS",
"TC",
"VA",
"PCPN",
"UNK",
"MTN OBSCN",
"SURFACE WIND",
"LLWS"
],
"type": "string",
"description": "Upstream hazard filter. Domestic: CONVECTIVE, TURBULENCE, ICING, IFR. International: TS, TURBULENCE, ICING, MTW (mountain wave), DS (duststorm), SS (sandstorm), TC (tropical cyclone), VA (volcanic ash). CWA: TS, TURBULENCE, ICING, IFR, PCPN (precipitation), UNK (unknown). Incompatible sources are not_applicable; wholly incompatible selections are rejected. MTN OBSCN, SURFACE WIND and LLWS are not served and are rejected. A hazard-scoped zero says nothing about other hazards."
},
"advisory_type": {
"enum": [
"sigmet",
"isigmet",
"cwa",
"airmet",
"all"
],
"type": "string",
"default": "all",
"description": "Product selection: sigmet is domestic SIGMETs, isigmet is international SIGMETs, cwa is Center Weather Advisories, and all reads all three independently. airmet is rejected with guidance to separate AIRMET products."
}
},
"additionalProperties": false
}| station_ids | array | ICAO station IDs to query. 1–10 stations per call, and every observation inside the hours window is returned for each. Supplying it alongside bbox is rejected — use bbox to ask about an area rather than a named set. |
| flight_category | array | Return only the stations whose flight category is one of these (e.g., ["IFR", "LIFR"] to find where conditions are poor). Applied in the tool after the draw is reduced to the latest observation per station and before limit, so it changes which stations come back, not what AWC draws or the upstream row cap. A station AWC could not rate (flight_category "unknown") never matches. Belongs to the bbox mode; supplying it alongside station_ids is rejected, since each named station already reports its own category. Optional. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"bbox": {
"type": "object",
"required": [
"minLat",
"minLon",
"maxLat",
"maxLon"
],
"properties": {
"maxLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Northern boundary latitude in decimal degrees."
},
"maxLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Eastern boundary longitude in decimal degrees."
},
"minLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Southern boundary latitude in decimal degrees."
},
"minLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Western boundary longitude in decimal degrees."
}
},
"description": "Geographic bounding box for an area observation survey."
},
"hours": {
"type": "integer",
"default": 1,
"maximum": 12,
"minimum": 1,
"description": "Lookback window in hours (1–12), not a row limit. With station_ids every observation inside the window is returned, so a station reporting more often than hourly yields more than one row per hour: at the default of 1, half-hourly stations return two observations and SPECI-issuing stations can return more, so budget rows by the station reporting interval, never one per station. With bbox the result is reduced to the latest observation per station, but the window still shapes the draw the upstream row cap applies to — a wide window spends that cap on repeat readings from busy stations instead of on more stations, so lower it before narrowing the box."
},
"limit": {
"type": "integer",
"maximum": 400,
"minimum": 1,
"description": "Maximum stations to return, applied after the draw is reduced to the latest observation per station, after any flight_category filter, and ordered by station ID ascending — so the same query with the same limit returns the same stations. It bounds the response without changing the area searched, which a smaller bbox would, and it keeps an alphabetical slice rather than a region or a condition. Distinct from the 400-row upstream cap: a limited result examined every station it counted and withheld some, while a capped one never drew the rest. Belongs to the bbox mode; supplying it alongside station_ids is rejected, since that mode already names the set. Omit to return every station in the box. Optional."
},
"station_ids": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[A-Za-z0-9]{4}$",
"description": "ICAO station ID: 4 ASCII letters or digits, case-insensitive and normalized to uppercase (e.g., KSEA, KJFK, K0S9)."
},
"maxItems": 10,
"minItems": 1,
"description": "ICAO station IDs to query. 1–10 stations per call, and every observation inside the hours window is returned for each. Supplying it alongside bbox is rejected — use bbox to ask about an area rather than a named set."
},
"flight_category": {
"type": "array",
"items": {
"enum": [
"VFR",
"MVFR",
"IFR",
"LIFR"
],
"type": "string",
"description": "A flight category: VFR, MVFR, IFR, or LIFR."
},
"minItems": 1,
"description": "Return only the stations whose flight category is one of these (e.g., [\"IFR\", \"LIFR\"] to find where conditions are poor). Applied in the tool after the draw is reduced to the latest observation per station and before limit, so it changes which stations come back, not what AWC draws or the upstream row cap. A station AWC could not rate (flight_category \"unknown\") never matches. Belongs to the bbox mode; supplying it alongside station_ids is rejected, since each named station already reports its own category. Optional."
}
},
"additionalProperties": false
}| distance_nm | integer | Search radius in nautical miles around station_id, defaulting to 100 when omitted. Belongs to the station_id search only — supplying it alongside bbox is rejected. |
| min_intensity | string | Return only reports carrying at least one turbulence or icing layer at this intensity or above. The filter selects reports, not layers — a matching report still carries its lighter layers, so a result may include NEG, TRC, or LGT entries alongside the layer that matched. Optional. |
| altitude_max_ft | integer | Filter by maximum altitude in feet MSL (e.g., 35000 for FL350), from 0 to 60000 ft — AWC searches no band below sea level, and none centred above FL600, which is already above the altitude any pilot report carries. Reports with an unknown altitude (altitude_ft null) cannot be shown to satisfy a bound and are dropped whenever either bound is set. Optional. |
| altitude_min_ft | integer | Filter by minimum altitude in feet MSL (e.g., 18000 for FL180), from 0 to 60000 ft — AWC searches no band below sea level, and none centred above FL600, which is already above the altitude any pilot report carries. Reports with an unknown altitude (altitude_ft null) cannot be shown to satisfy a bound and are dropped whenever either bound is set. Optional. |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"bbox": {
"type": "object",
"required": [
"minLat",
"minLon",
"maxLat",
"maxLon"
],
"properties": {
"maxLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Northern boundary latitude in decimal degrees."
},
"maxLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Eastern boundary longitude in decimal degrees."
},
"minLat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Southern boundary latitude in decimal degrees."
},
"minLon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Western boundary longitude in decimal degrees."
}
},
"description": "Geographic bounding box for area PIREP search."
},
"hours": {
"type": "integer",
"default": 3,
"maximum": 12,
"minimum": 1,
"description": "How many hours of history to return. Default 3."
},
"limit": {
"type": "integer",
"maximum": 400,
"minimum": 1,
"description": "Maximum reports to return, applied last — after every filter and after ordering by observation time descending, so a limited result is the most recent reports rather than an arbitrary slice. It bounds the response without changing what is searched, which every other parameter does. Distinct from the 400-row upstream cap: a limited result examined every report it counted and withheld some, while a capped one never drew the rest. Selection is by recency alone, so pair it with min_intensity to bound a result by severity. Omit to return every match. Optional."
},
"station_id": {
"type": "string",
"pattern": "^[A-Za-z0-9]{4}$",
"description": "ICAO station ID as center point for radial search — 4 ASCII letters or digits, case-insensitive and normalized to uppercase (e.g., KSEA, K0S9). Use with distance_nm."
},
"distance_nm": {
"type": "integer",
"maximum": 500,
"minimum": 10,
"description": "Search radius in nautical miles around station_id, defaulting to 100 when omitted. Belongs to the station_id search only — supplying it alongside bbox is rejected."
},
"min_intensity": {
"enum": [
"lgt",
"mod",
"sev"
],
"type": "string",
"description": "Return only reports carrying at least one turbulence or icing layer at this intensity or above. The filter selects reports, not layers — a matching report still carries its lighter layers, so a result may include NEG, TRC, or LGT entries alongside the layer that matched. Optional."
},
"altitude_max_ft": {
"type": "integer",
"maximum": 60000,
"minimum": 0,
"description": "Filter by maximum altitude in feet MSL (e.g., 35000 for FL350), from 0 to 60000 ft — AWC searches no band below sea level, and none centred above FL600, which is already above the altitude any pilot report carries. Reports with an unknown altitude (altitude_ft null) cannot be shown to satisfy a bound and are dropped whenever either bound is set. Optional."
},
"altitude_min_ft": {
"type": "integer",
"maximum": 60000,
"minimum": 0,
"description": "Filter by minimum altitude in feet MSL (e.g., 18000 for FL180), from 0 to 60000 ft — AWC searches no band below sea level, and none centred above FL600, which is already above the altitude any pilot report carries. Reports with an unknown altitude (altitude_ft null) cannot be shown to satisfy a bound and are dropped whenever either bound is set. Optional."
}
},
"additionalProperties": false
}