37 lines
2.3 KiB
Text
37 lines
2.3 KiB
Text
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{% extends "base.html.j2" %}
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{% block title %}{{ page_title }}{% endblock %}
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{% block description %}{{ page_description }}{% endblock %}
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{% block canonical_path %}{{ canonical_path }}{% endblock %}
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{% block content %}
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<nav class="breadcrumb" aria-label="Breadcrumb">
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{% for label, href in breadcrumb %}{% if href %}<a href="{{ href }}">{{ label }}</a>{% else %}<span>{{ label }}</span>{% endif %}{% if not loop.last %} <span class="sep">›</span> {% endif %}{% endfor %}
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</nav>
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<article class="climate-page">
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<h1>About Thermograph</h1>
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<p class="lede">Thermograph answers one question for any point on Earth: <b>how unusual is this
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weather?</b> Instead of an absolute temperature, it shows where a day falls in that exact
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location's own climate history.</p>
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<h2>Where the data comes from</h2>
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<p>The ~45-year daily record (high, low, feels-like, humidity, wind, gust and precipitation)
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comes from the <b>ERA5 reanalysis</b> (ECMWF), served via <a href="https://open-meteo.com/" rel="nofollow">Open-Meteo</a>.
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Because reanalysis is a gridded, model-consistent record, Thermograph works even where there's
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no weather station, anywhere on the ~4 sq mi grid.</p>
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<h2>How a day is graded</h2>
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<p>For each metric and date, Thermograph builds a reference distribution from every historical day
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within <b>±7 days of that day-of-year</b>, a 15-day seasonal window across all years. The
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observed value is placed on that distribution as an <a href="{{ base }}/glossary/percentile">empirical
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percentile</a>, then mapped to a grade from “Below Normal” through “High” to “Near Record”.</p>
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<p>Everything is <b>relative to the location</b>: a {{ temp(60) }} day can be “Above Normal” in one place and
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“Below Normal” in another. Precipitation is graded only among days that actually rained, so “Heavy”
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means heavy for a rainy day <i>here</i>. See the <a href="{{ base }}/legend">grade guide</a> for the full scale.</p>
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<h2>Freshness</h2>
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<p>The historical archive updates as new days are added; recent and forecast conditions refresh hourly.
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City climate pages show the latest recorded day graded against the local normal.</p>
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<p><a class="cta" href="{{ base }}/">Open the weather grader →</a></p>
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</article>
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{% endblock %}
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