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Hardcode lat/lon for simplicity & reliability.\nconst AIRPORTS: Record<\n string,\n { icao: string; iata?: string; lat: number; lon: number }\n> = {\n KLAX: { icao: \"KLAX\", iata: \"LAX\", lat: 33.9425, lon: -118.4081 },\n KHOU: { icao: \"KHOU\", iata: \"HOU\", lat: 29.6454, lon: -95.2789 },\n KSEA: { icao: \"KSEA\", iata: \"SEA\", lat: 47.4472, lon: -122.31361 },\n KMIA: { icao: \"KMIA\", iata: \"MIA\", lat: 25.79, lon: -80.32 },\n KMDW: { icao: \"KMDW\", iata: \"MDW\", lat: 41.78, lon: -87.65 },\n KAUS: { icao: \"KAUS\", iata: \"AUS\", lat: 30.18, lon: -97.68 },\n KDEN: { icao: \"KDEN\", iata: \"DEN\", lat: 39.85, lon: -104.66 },\n KSFO: { icao: \"KSFO\", iata: \"SFO\", lat: 37.61961, lon: -122.36558 },\n KDFW: { icao: \"KDFW\", iata: \"DFW\", lat: 32.9, lon: -97.02 },\n};\n\nfunction resolveStation(params: URLSearchParams) {\n const icaoParam = (params.get(\"icao\") || \"\").toUpperCase();\n const iataParam = (params.get(\"iata\") || \"\").toUpperCase();\n\n if (icaoParam && AIRPORTS[icaoParam]) return AIRPORTS[icaoParam];\n\n if (iataParam) {\n const match = Object.values(AIRPORTS).find((a) => a.iata === iataParam);\n if (match) return match;\n }\n return null;\n}\n\nasync function fetchJson(url: string) {\n const r = await fetch(url, {\n headers: { \"User-Agent\": USER_AGENT, \"Accept\": \"application/geo+json\" },\n });\n if (!r.ok) throw new Error(`Fetch failed ${r.status} for ${url}`);\n return r.json();\n}\n\nasync function getNwsHourly(lat: number, lon: number) {\n const points = await fetchJson(\n `https://api.weather.gov/points/${lat},${lon}`,\n );\n const tz = points.properties.timeZone as string;\n const hourlyUrl = points.properties.forecastHourly as string;\n\n const hourly = await fetchJson(hourlyUrl);\n const periods = hourly.properties.periods as Array<\n { startTime: string; temperature: number; temperatureUnit: string }\n >;\n\n // NWS hourly startTime is ISO with offset; Luxon will parse correctly.\n return {\n tz,\n hours: periods.map((p) => ({\n t: DateTime.fromISO(p.startTime),\n tempF: p.temperatureUnit === \"F\"\n ? p.temperature\n : (p.temperature * 9) / 5 + 32,\n })),\n };\n}\n\n// function parseAddsCsv(text: string): Array> {\n// // ADDS returns comment lines starting with #, then a header row.\n// const lines = text.split(\"\\n\").map((l) => l.trim()).filter((l) =>\n// l && !l.startsWith(\"#\")\n// );\n// if (lines.length < 2) return [];\n// const header = lines[0].split(\",\").map((s) => s.trim());\n// return lines.slice(1).map((line) => {\n// const cols = line.split(\",\");\n// const row: Record = {};\n// for (let i = 0; i < header.length; i++) {\n// row[header[i]] = (cols[i] ?? \"\").trim();\n// }\n// return row;\n// });\n// }\n\nasync function getLatestNwsObservation(stationId: string) {\n const url =\n `https://api.weather.gov/stations/${stationId}/observations/latest`;\n\n const r = await fetch(url, {\n headers: {\n \"User-Agent\": USER_AGENT,\n \"Accept\": \"application/geo+json\",\n },\n });\n if (!r.ok) {\n throw new Error(`NWS obs fetch failed ${r.status} for ${stationId}`);\n }\n const j = await r.json();\n\n const ts = j.properties.timestamp as string; // ISO time\n const tempC = j.properties.temperature?.value; // degC, may be null\n\n if (!ts || tempC === null || tempC === undefined) return null;\n\n return {\n obsTime: DateTime.fromISO(ts).toUTC(),\n tempF: (tempC * 9) / 5 + 32,\n raw: j.properties,\n };\n}\n\nfunction todayHighForLocalDate(\n hours: Array<{ t: DateTime; tempF: number }>,\n tz: string,\n localDateISO: string,\n) {\n const todays = hours\n .map((h) => ({ ...h, local: h.t.setZone(tz) }))\n .filter((h) => h.local.toISODate() === localDateISO);\n\n if (!todays.length) return null;\n\n let max = -Infinity;\n let maxTime: DateTime | null = null;\n for (const h of todays) {\n if (h.tempF > max) {\n max = h.tempF;\n maxTime = h.local;\n }\n }\n return { highF: max, atLocal: maxTime! };\n}\n\nfunction nearestForecastTemp(\n hours: Array<{ t: DateTime; tempF: number }>,\n whenUTC: DateTime,\n) {\n let best = hours[0];\n let bestAbs = Infinity;\n for (const h of hours) {\n const d = Math.abs(h.t.toUTC().diff(whenUTC).as(\"minutes\"));\n if (d < bestAbs) {\n bestAbs = d;\n best = h;\n }\n }\n return best.tempF;\n}\n\nfunction adjustedHigh(\n hours: Array<{ t: DateTime; tempF: number }>,\n tz: string,\n localDateISO: string,\n obsUTC: DateTime,\n biasF: number,\n tauHours = 6,\n) {\n const obs = obsUTC.toUTC();\n const todays = hours\n .map((h) => ({ ...h, local: h.t.setZone(tz) }))\n .filter((h) => h.local.toISODate() === localDateISO);\n\n let maxAdj = -Infinity;\n for (const h of todays) {\n const leadHours = Math.max(0, h.t.toUTC().diff(obs).as(\"hours\"));\n const weight = Math.exp(-leadHours / tauHours);\n const tadj = h.tempF + biasF * weight;\n if (tadj > maxAdj) maxAdj = tadj;\n }\n return maxAdj;\n}\n\nfunction clamp(x: number, a: number, b: number) {\n return Math.max(a, Math.min(b, x));\n}\n\nexport default async function (req: Request): Promise {\n try {\n const url = new URL(req.url);\n const airport = resolveStation(url.searchParams);\n if (!airport) {\n return new Response(\n JSON.stringify(\n {\n error: \"Pass eg ?icao=KLAX or ?iata=LAX.\",\n },\n null,\n 2,\n ),\n {\n status: 400,\n headers: { \"content-type\": \"application/json\" },\n },\n );\n }\n\n const { tz, hours } = await getNwsHourly(airport.lat, airport.lon);\n const nowLocal = DateTime.now().setZone(tz);\n const todayISO = nowLocal.toISODate()!;\n\n const base = todayHighForLocalDate(hours, tz, todayISO);\n if (!base) throw new Error(\"No NWS hourly data for today.\");\n\n const metar = await getLatestNwsObservation(airport.icao);\n\n let highAdj = base.highF;\n let bias = 0;\n\n if (metar) {\n const tNwsNow = nearestForecastTemp(hours, metar.obsTime);\n bias = metar.tempF - tNwsNow;\n highAdj = adjustedHigh(hours, tz, todayISO, metar.obsTime, bias, 6);\n }\n\n const range = clamp(\n 2 + 0.6 * Math.abs(highAdj - base.highF) + 0.3 * Math.abs(bias),\n 2,\n 8,\n );\n\n const out = {\n station: airport.icao,\n iata: airport.iata ?? null,\n dateLocal: todayISO,\n timeZone: tz,\n\n forecastHighF: Math.round(highAdj),\n confidencePlusMinusF: Math.round(range),\n\n debug: {\n nwsHighF: Math.round(base.highF),\n nwsHighTimeLocal: base.atLocal.toISO(),\n metarUsed: Boolean(metar),\n biasF: Math.round(bias * 10) / 10,\n metarObsTimeUTC: metar?.obsTime.toISO() ?? null,\n metarTempF: metar ? Math.round(metar.tempF * 10) / 10 : null,\n },\n };\n\n return new Response(JSON.stringify(out, null, 2), {\n headers: { \"content-type\": \"application/json\" },\n });\n } catch (e: any) {\n return new Response(\n JSON.stringify({ error: String(e?.message ?? e) }, null, 2),\n {\n status: 500,\n headers: { \"content-type\": \"application/json\" },\n },\n );\n }\n}","deleted","label",[99],"permalink","https://www.val.town/x/jvt012/get-high-temp/code/initial-works.ts","extension","actionData","errors"]