Satyam-Rastogi
108 lines
3.9 KiB
JavaScript
108 lines
3.9 KiB
JavaScript
/**
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* IEM Local Storm Reports (LSR) hook.
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* Fetches spotter-verified ground truth reports from the same provider as SBW.
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* CORS-open, no auth needed.
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*/
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import { useState, useEffect } from 'react';
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const LSR_URL = 'https://mesonet.agron.iastate.edu/geojson/lsr.geojson';
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const WFO = 'FWD';
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const KEEP_TYPES = new Set(['H', 'G', 'W', 'T', 'F', 'D', '4']);
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const TYPE_TEXT = {
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H: 'HAIL',
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'4': 'HAIL',
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G: 'WIND GUST',
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W: 'HIGH WIND',
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T: 'TORNADO',
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F: 'FLASH FLOOD',
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D: 'STRUCTURAL DAMAGE',
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};
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// Plano / Collin County bounding box
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const BBOX = { minLat: 32.85, maxLat: 33.45, minLon: -97.15, maxLon: -96.35 };
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function inBBox(lat, lon) {
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return lat >= BBOX.minLat && lat <= BBOX.maxLat && lon >= BBOX.minLon && lon <= BBOX.maxLon;
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}
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export function useStormReports() {
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const [reports, setReports] = useState([]);
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const [loading, setLoading] = useState(true);
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useEffect(() => {
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let cancelled = false;
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const load = async () => {
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setLoading(true);
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try {
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const now = new Date();
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const cutoff = new Date(now.getTime() - 36 * 30.44 * 86400000);
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const sts = encodeURIComponent(cutoff.toISOString());
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const ets = encodeURIComponent(now.toISOString());
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const url = `${LSR_URL}?sts=${sts}&ets=${ets}&wfo=${WFO}`;
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const res = await fetch(url);
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if (!res.ok) throw new Error(`LSR ${res.status}`);
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const geojson = await res.json();
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const parsed = (geojson.features || [])
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.map(feature => {
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const p = feature.properties || {};
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const type = p.typetext?.charAt(0)?.toUpperCase() || p.type || '';
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// Some feeds use numeric string type code instead
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const typeKey = KEEP_TYPES.has(type) ? type
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: KEEP_TYPES.has(p.type) ? p.type
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: null;
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if (!typeKey) return null;
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const coords = feature.geometry?.coordinates;
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if (!coords || coords.length < 2) return null;
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const [lon, lat] = coords;
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if (!inBBox(lat, lon)) return null;
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const valid = p.valid || p.utc_valid || null;
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const magnitude = (p.magnitude != null && p.magnitude !== '') ? parseFloat(p.magnitude) : null;
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const city = p.city || p.st || '';
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const county = p.county || '';
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const source = p.source || p.remark_source || '';
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const remark = p.remark || '';
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return {
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id: `LSR-${typeKey}-${valid}-${Math.round(lat * 1000)}-${Math.round(lon * 1000)}`,
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lat,
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lon,
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type: typeKey,
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typetext: TYPE_TEXT[typeKey] ?? typeKey,
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magnitude: isNaN(magnitude) ? null : magnitude,
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city,
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county,
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source,
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remark,
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valid,
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};
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})
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.filter(Boolean)
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.sort((a, b) => new Date(b.valid) - new Date(a.valid))
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.slice(0, 500);
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if (!cancelled) setReports(parsed);
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} catch {
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// LSR unreachable — silently show empty
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if (!cancelled) setReports([]);
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} finally {
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if (!cancelled) setLoading(false);
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}
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};
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load();
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return () => { cancelled = true; };
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}, []);
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return { reports, loading };
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}
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