{"uid":"cap_QwKXOLP6DUpM9RLig7KI2","slug":"noaa-spc-severe-weather-outlook-by-coordinate-e44f8c99","name":"NOAA SPC Severe Weather Outlook by Coordinate","description":"NOAA SPC severe weather outlook at a coordinate - risk category for days 1 to 3 and day 1 tornado, damaging wind and large hail probabilities","url":"https://saylorinnovations.com/api/weather/severe-outlook?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"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","required":["lat","lon"],"properties":{"lat":{"type":"string","description":"Latitude (United States)"},"lon":{"type":"string","description":"Longitude (United States)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["outlook","any_severe_risk"],"properties":{"lat":{"type":"number","description":"Latitude in decimal degrees"},"lon":{"type":"number","description":"Longitude in decimal degrees"},"note":{"type":"string","description":"Caveat or context for reading the result"},"source":{"type":"string","description":"Data source the values come from"},"outlook":{"type":"array","items":{"type":"object","properties":{"day":{"type":["number","null"],"description":"Outlook day, 1 to 3"},"risk":{"type":["string","null"],"description":"Risk name"},"valid":{"description":"True when the input passed validation"},"issued":{"type":["string","null"],"description":"Issued at (UTC)"},"expires":{"type":["string","null"],"description":"Valid until (UTC)"},"category":{"description":"Category"},"forecaster":{"type":["string","null"],"description":"Forecaster names"},"description":{"description":"Short description"}}},"description":"One entry per day (1 to 3) with the risk name, SPC category code (TSTM, MRGL, SLGT, ENH, MDT, HIGH or NONE), validity window, issue time and forecaster"},"any_severe_risk":{"type":"boolean","description":"Any severe risk"},"highest_risk_in_3_days":{"type":["object","null"],"properties":{"day":{"type":["number","null"],"description":"Day of the highest risk"},"risk":{"type":["string","null"],"description":"Name of the highest risk"}},"description":"Highest risk in 3 days"},"day1_probabilities_percent":{"type":"object","properties":{"tornado":{"type":["number","null"],"description":"Tornado chance within 25 miles, percent"},"large_hail":{"type":["number","null"],"description":"Large hail"},"damaging_wind":{"type":["number","null"],"description":"Damaging wind"}},"description":"Day1 probabilities, as a percentage"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1Yv2lYyPwIXtv5TNGUn1u","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns NOAA Storm Prediction Center severe weather risk categories for days 1–3 and day 1 tornado, damaging wind, and large hail probabilities for a given US lat/lon.","exampleAgentPrompt":"What's the NOAA SPC severe weather outlook for the next 3 days at latitude 36.15, longitude -95.99? I want to know the risk category each day and whether there's any tornado or large hail probability on day 1.","exampleUseCases":[{"title":"Outdoor event safety check","prompt":"We're hosting an outdoor concert in Tulsa, Oklahoma — roughly 36.15 latitude, -95.99 longitude — this weekend. Can you pull the SPC severe weather outlook for the next 3 days and tell me if there's any significant tornado or hail risk on day 1?"},{"title":"Agricultural field operations planning","prompt":"I need to decide whether to start harvesting wheat at my field near Amarillo, Texas — about 35.22 latitude, -101.83 longitude. Can you check the SPC convective outlook for the next 3 days and flag if there's any moderate or higher severe weather risk?"},{"title":"Construction site weather risk monitoring","prompt":"My crew is working a job site outside Oklahoma City at 35.47 latitude, -97.52 longitude all week. Can you check the NOAA SPC severe weather outlook for days 1 through 3 and let me know if damaging winds or large hail are in the forecast for day 1?"}],"resultDescription":"Returns an array of outlook entries for days 1–3, each with the SPC risk name (e.g. SLGT, ENH, MDT, HIGH), category code, validity window, issue time, and forecaster. Also includes a boolean any_severe_risk flag, highest risk in the 3-day window with its day, and day 1 specific probabilities for tornado, damaging wind, and large hail. A note field provides context for interpreting the result and a source field identifies the data origin.","failureModes":["Missing or invalid lat/lon query parameters — returns validation error","Coordinates outside the contiguous United States — may return NONE risk or an error","NOAA SPC data temporarily unavailable — upstream fetch failure","Coordinates on the boundary of outlook polygons may produce ambiguous results","Outlook not yet issued for a future day — may return null for day 2 or day 3 entries"],"whenToPreferThis":"Use this endpoint when you need structured, per-day NOAA SPC severe weather risk categories and day 1 hazard probabilities (tornado, wind, hail) for a specific US coordinate. Prefer this over general weather APIs when the use case specifically requires SPC convective outlook data (TSTM/MRGL/SLGT/ENH/MDT/HIGH classifications) rather than temperature or precipitation forecasts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:39:44.689Z","isFirstParty":false,"canonicalSlug":"noaa-spc-severe-weather-outlook-by-coordinate-e44f8c99"}