2c:["$","title",null,{"children":"Fire Weather in the U.S. | Climate Central | Observable"}] 31:T8ef,function plotDrivers(data, driveVar) { const div = d3.create("div"); const projection = d3.geoAlbersUsa().scale(550).translate([250, 140]); const path = d3.geoPath().projection(projection); const svg = div.append("svg").attr("viewBox", [0, 0, 500, 500 * 0.55]); const logo = svg.append("svg:image") .attr("x",425) .attr("y", 200) .attr('width', 50) .attr('height', 50) .attr("xlink:href", squarelogo1); const colors = [ "#08519c", "#3182bd", "#6baed6", "#9ecae1", "#eff3ff", "#f7f7f7", "#fee5d9", "#fc9272", "#fb6a4a", "#de2d26", "#a50f15" ]; let seasData = data.filter(d=> d.season === driverOpts[1]); for (let i = 0; i < seasData.length; i++) { let div = +seasData[i].CLIMDIV; let change = +seasData[i][driveVar]; let color; if (change <= -40) { color = colors[0]; } else if (change > -40 && change <= -30) { color = colors[1]; } else if (change > -30 && change <= -20) { color = colors[2]; } else if (change > -20 && change <= -10) { color = colors[3]; } else if (change > -10 && change <= -1) { color = colors[4]; } else if (change > -1 && change < 1) { color = colors[5]; } else if (change >= 1 && change < 10) { color = colors[6]; } else if (change >= 10 && change < 20) { color = colors[7]; } else if (change >= 20 && change < 30) { color = colors[8]; } else if (change >= 30 && change < 40) { color = colors[9]; } else if (change >= 40) { color = colors[10]; } else { color = "#dbdbdb"; } for (let j = 0; j < climdivs.features.length; j++) { let jsonDiv = +climdivs.features[j].properties.CLIMDIV; if (div === jsonDiv) { climdivs.features[j].properties.change = +change; climdivs.features[j].properties.color = color; break; } } }; const allDivs = svg .selectAll("path") .data(climdivs.features) .enter() .append("path") .attr("d", path) .style("fill", (d) => d.properties.color === undefined ? "#dbdbdb" : d.properties.color ) .style("stroke", "black") .style("stroke-width", 0.15); return div.node(); 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2f:{"id":"1263f874cb3eefda","slug":"fire-weather-in-the-us","title":"Fire Weather in the U.S.","thumbnail":"58c40ccf0915afaa8114abde2dcc6589e0505474ba4927f49573ead5fd1bde40","access_level":"public","create_time":"$D2023-04-06T16:00:32.598Z","update_time":"$D2026-09-01T20:29:30.547Z","view_time":null,"first_public_time":"$D2023-05-01T05:45:22.169Z","fork":false,"stars":10,"starred":false,"owner":{"type":"team","id":"1b16cfac8e47ddf9","login":"climatecentral","name":"Climate Central","avatar_url":"https://avatars-next.observableusercontent.com/b8d84fbc6265f9a7c731e62fc076af7c84c7be3a9be06e52da319786d6b129dd","tier":"pro_2024"},"version":10235,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"43d98796353ee1e2","login":"ktrudeau","name":"Kaitlyn Trudeau","avatar_url":"https://avatars-next.observableusercontent.com/3650447af2e2411fcfe3aa899ed520cce0fe01a62f5b78ec6617c32d64cdf326","tier":null}],"members":[{"type":"individual","id":"43d98796353ee1e2","login":"ktrudeau","name":"Kaitlyn Trudeau","avatar_url":"https://avatars-next.observableusercontent.com/3650447af2e2411fcfe3aa899ed520cce0fe01a62f5b78ec6617c32d64cdf326","tier":null,"role":"editor"},{"type":"team","id":"1b16cfac8e47ddf9","login":"climatecentral","name":"Climate Central","avatar_url":"https://avatars-next.observableusercontent.com/b8d84fbc6265f9a7c731e62fc076af7c84c7be3a9be06e52da319786d6b129dd","tier":"pro_2024","role":"viewer"}],"comments":[],"custom_thumbnail":true,"trashed":false,"subscribed":null,"forks":20,"collection":null,"type":"notebook","body":{"title":"Fire Weather in the U.S.","cells":[{"id":0,"value":"

Fire Weather in the U.S.

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":1541,"value":"

Climate change is worsening wildfires across the United States and putting more people and places at risk. Warming from heat-trapping pollution is affecting weather conditions in ways that increase the risks of wildfire. Long-term warming trends are drying out forests, grasslands, and other landscapes — helping fires spread and hindering opportunities to fight and prevent them.

To explore growing wildfire risks across the U.S., Climate Central analyzed historical trends in fire weather — the combination of high heat, low humidity, and strong winds.

","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":8966,"value":"

See all of Climate Central's resources about fire weather.

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":1571,"value":"

What is a fire weather day?

","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":1700,"value":"

Fire weather can generally be described as hot, dry, and windy conditions which prime the landscape for extreme fire behavior. The presence of fire weather conditions does not mean a fire is guaranteed to occur. Instead, fire weather acts as a threat multiplier — increasing the chances that, should a fire break out, that fire will be much more dangerous and destructive than if the conditions were otherwise.

While the definition of fire weather may vary, we define a fire weather day as any calendar day when temperature, relative humidity, and wind speed co-occur at or above their respective thresholds (as defined below) for at least two hours.

","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":2197,"value":" \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

Temperature	Relative Humidity	Wind Speed
At least 45°F in the winter, 50°F in the spring or fall, or 55°F in summer	At or below regional thresholds, ranging from 20-40%	Sustained winds of at least 15 mph (or 10 mph for Florida)

\n","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":9872,"value":"
","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":3477,"value":"

Fire Weather Trends by Climate Division, 1973-2025

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":8998,"value":"Find your climate division.

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":2330,"value":"

${viewof form1}

${viewof form2}

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":9635,"value":"$${viewof dataDownload}

Hover over a climate division for more information.

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":2265,"value":"trendMap = html`

${viewof bigChart}

${viewof legend}

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9045,"value":"
","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":9065,"value":"fwDrivers= html`

Fire Weather Drivers by Climate Division, 1973-2025

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":2757,"value":"

We looked at each fire weather variable — temperature, relative humidity, and wind speed — separately to better understand whether they meet their respective threshold more or less now compared to fifty-one years ago. Red colors show where each variable is meeting its threshold more often and blue shows where each variable is meeting its threshold less often.

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"},{"id":9061,"value":"viewof driverOpts = Inputs.form([\n Inputs.select([\"Temperature\", \"Relative Humidity\", \"Wind Speed\"], {label: \"Variable\", value: \"Temperature\"}), \n Inputs.select([\"Annual\", \"Winter\", \"Spring\", \"Summer\", \"Fall\"], {label: \"Season\", value: \"Annual\"})\n])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9077,"value":"driverMap = html`

${plotDrivers(drivers, driveVar)}

${viewof legend2}

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9445,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":9659,"value":"---","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":2808,"value":"### CODE FOR PAGE FUNCTIONALITY","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":9161,"value":"viewof bigChart = {\n if (form1 === \"Change in Fire Weather Days\") {\n return plotTrends(fireWx, form2);\n } else {\n return plotTrends(averages, form2);\n } \n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9209,"value":"viewof legend = {\n if(form1 === \"Change in Fire Weather Days\") {\n return Legend(d3.scaleThreshold([-56, -28, -14, -7, -1, 1, 7, 14, 28, 56], [\"#08519c\",\"#3182bd\",\"#6baed6\",\"#9ecae1\",\"#eff3ff\",\"#f7f7f7\",\"#fee5d9\",\"#fc9272\", \"#fb6a4a\",\"#de2d26\",\"#a50f15\"]), {\n tickLabels: \"20px\",\n title: `Change in average ${form2.toLowerCase()} fire weather days since 1973`,\nwidth: width,\n height: 60\n})} else {\n return Legend(d3.scaleThreshold([-56, -28, -14, -7, -1, 1, 7, 14, 28, 56], [\"#08519c\",\"#3182bd\",\"#6baed6\",\"#9ecae1\",\"#eff3ff\",\"#f7f7f7\",\"#fee5d9\",\"#fc9272\", \"#fb6a4a\",\"#de2d26\",\"#a50f15\"]), {\n tickLabels: \"20px\",\n title: `Average ${form2.toLowerCase()} fire weather days, 1973-2024`,\n width: width,\n height: 60\n })\n}\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9427,"value":"viewof legend2 = Legend(d3.scaleThreshold([-56, -28, -14, -7, -1, 1, 7, 14, 28, 56], [\"#08519c\",\"#3182bd\",\"#6baed6\",\"#9ecae1\",\"#eff3ff\",\"#f7f7f7\",\"#fee5d9\",\"#fc9272\",\"#fb6a4a\",\"#de2d26\",\"#a50f15\"]), {\n tickLabels: \"20px\",\n title: `Change in ${driverOpts[1].toLowerCase()} days ${driverOpts[0].toLowerCase()} met its threshold`,\nwidth: width,\n height: 60\n});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9335,"value":"viewof dataDownload = DOM.download(\n FileAttachment(\"2026FireWeatherData.xlsx\").blob(),\n FileAttachment(\"2026FireWeatherData.xlsx\").name,\n \"Download Data\"\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9281,"value":"driveVar = {\n if (driverOpts[0] === \"Temperature\") {\n return \"tempChange\";\n } else if (driverOpts[0] === \"Relative Humidity\") {\n return \"rhChange\";\n } else if (driverOpts[0] === \"Wind Speed\") {\n return \"windChange\";\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9269,"value":"$31","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":10120,"value":"mutable thisDiv = null","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":10114,"value":"colors = [\n \"#08519c\",\n \"#3182bd\",\n \"#6baed6\",\n \"#9ecae1\",\n \"#eff3ff\",\n \"#f7f7f7\",\n \"#fee5d9\",\n \"#fc9272\",\n \"#fb6a4a\",\n \"#de2d26\",\n \"#a50f15\"\n]\n","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9127,"value":"drivers = FileAttachment(\"FINAL_DRIVER_SLOPES.csv\").csv({typed:true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":100,"value":"averages = FileAttachment(\"2026FWAvgs.csv\").csv({typed:true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":3339,"value":"fireWx = FileAttachment(\"2026FWSlopes.csv\").csv({typed:true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":24,"value":"climdivs = FileAttachment(\"climdiv-1.js\").json()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":9609,"value":"squarelogo1 = await(FileAttachment(\"squarelogo (1).png\")).url()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":17,"value":"import { Legend } from \"observable:@d3/color-legend\"","pinned":false,"hidden":false,"mode":"js","author":"$undefined","summary":"$undefined"},{"id":10099,"value":"import {plotTrends, getMessage, viewof form1, viewof form2, toCamelCase} from \"@climatecentral/fire-weather-interactive-map\";","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":10125,"value":"","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined"},{"id":5890,"value":"import * as d3 from \"npm:d3\";","pinned":false,"hidden":false,"mode":"js","author":"$undefined","summary":"$undefined"},{"id":3079,"value":"","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined"}],"files":"$W32","stdlib":"2","titling":"auto"}} 30:"$2f:body" 2b:E{"digest":"NEXT_REDIRECT;replace;/@climatecentral/fire-weather-in-the-us;307;"}