NWS Weather Alerts & Point Forecast Scraper

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Fetch active National Weather Service (NWS) weather alerts and multi-day point forecasts for any list of coordinates. Supply a list of lat/lon pairs (trailheads, campgrounds, peaks, campsites, or any geographic point) and get back per-point active alerts plus a 7-day forecast in a single run.

No API key required — the actor uses the public api.weather.gov REST API with a polite request rate.

What it does

For each coordinate you provide, the actor:

1. Fetches active alerts (via /alerts/active?point=lat,lon) — returns any currently active NWS weather alerts (Severe Thunderstorm Warning, Winter Storm Warning, Flood Watch, Red Flag Warning, etc.) that cover that location.
2. Fetches the 7-day point forecast (two-hop: /points/lat,lon → /gridpoints/{office}/{x},{y}/forecast) — returns the NWS forecast for the nearest grid cell, broken into morning/afternoon/overnight periods.

Each output record carries a record_type field (alert or point_forecast) so you can filter downstream.

Input

Example input

{
"coordinates":[
{"lat":44.2706,"lon":-71.3033,"label":"Mt Washington Summit"},
{"lat":44.5236,"lon":-71.1762,"label":"Pinkham Notch"},
{"lat":43.9342,"lon":-71.6476,"label":"Lonesome Lake Hut"}
],
"includeAlerts":true,
"includeForecast":true,
"maxItems":100
}

Output

Each record in the dataset has the following fields:

Example alert record

{
"record_type":"alert",
"latitude":44.2706,
"longitude":-71.3033,
"label":"Mt Washington Summit",
"event":"Wind Advisory",
"severity":"Moderate",
"certainty":"Likely",
"urgency":"Expected",
"area_desc":"Northern White Mountains; White Mountains",
"effective":"2026-05-29T06:00:00-04:00",
"expires":"2026-05-29T18:00:00-04:00",
"headline":"Wind Advisory issued May 29 at 6:00AM EDT until May 29 at 6:00PM EDT",
"description":"Southwest winds 25 to 35 mph with gusts up to 50 mph.",
"instruction":"Use extra caution when driving, especially in high-profile vehicles.",
"forecast_period":"",
"temperature":null,
"wind_speed":"",
"short_forecast":"",
"detailed_forecast":""
}

Example forecast record

{
"record_type":"point_forecast",
"latitude":44.2706,
"longitude":-71.3033,
"label":"Mt Washington Summit",
"event":"",
"severity":"",
"forecast_period":"Tonight",
"effective":"2026-05-29T18:00:00-04:00",
"expires":"2026-05-30T06:00:00-04:00",
"temperature":34,
"wind_speed":"35 to 45 mph",
"short_forecast":"Mostly Cloudy",
"detailed_forecast":"Mostly cloudy, with a low around 34. Southwest wind 35 to 45 mph, with gusts as high as 65 mph.",
"description":"Mostly cloudy, with a low around 34. Southwest wind 35 to 45 mph, with gusts as high as 65 mph.",
"headline":"",
"instruction":"",
"alert_id":"",
"area_desc":"",
"certainty":"",
"urgency":""
}

Coverage notes

• Continental US only. The NWS API (api.weather.gov) covers the contiguous United States, Alaska, Hawaii, and some US territories. Coordinates outside NWS coverage (ocean, international) return no data and are skipped with a warning.
• Alerts: Returns only currently active alerts at the time of the run. Historical alerts are not available via this endpoint.
• Forecast: 7-day forecast, typically 14 periods (7 daytime + 7 overnight).

Use cases

• Trail condition monitoring — batch-check active weather alerts and forecasts for a list of trailheads before a trip.
• Outdoor trip planning automation — pair with NPS Park Data Scraper or Recreation.gov data to enrich venue records with live weather context.
• Campground weather briefings — generate per-campsite weather summaries from a coordinate list.
• Alert dashboards — monitor which locations in a portfolio currently have active weather alerts.

Rate limiting

The NWS API has no published hard rate limit but requests a polite User-Agent header (included automatically) and reasonable request rates. This actor observes a 1-second delay between API calls per coordinate. For large coordinate lists, runs may take several minutes.