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New heat bands for UTCI and Air -using latest research values
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<h1>Reading the stress bands</h1>
<p class="tagline">Colour-coded comfort, at a glance.</p>
<p>
SunScope maps every SunSoak value to a thermal stress band so you can read conditions at a glance.
The same colours run through the forecast table and the day strip — blue for cold, green for
comfortable, and yellow through red for increasing heat stress.
</p>
<table class="stress-table">
<thead>
<tr><th>SunSoak range</th><th>Band</th><th>What it means outdoors</th></tr>
</thead>
<tbody>
<tr><td><span class="swatch" style="background:#23408f"></span>Below 27 °C</td><td>Polar</td><td>Survivable only with expedition-grade kit; do not go outside unprepared</td></tr>
<tr><td><span class="swatch" style="background:#3f73c4"></span>27 to 13 °C</td><td>Arctic</td><td>Very strong cold stress; full winter protection needed</td></tr>
<tr><td><span class="swatch" style="background:#7eb0e0"></span>13 to 0 °C</td><td>Freezing</td><td>Strong cold stress; warm layers essential</td></tr>
<tr><td><span class="swatch" style="background:#bcd9ec"></span>0 to 9 °C</td><td>Cold</td><td>Moderate cold stress; coat and gloves advised</td></tr>
<tr><td><span class="swatch" style="background:#c8dcc0"></span>9 to 18 °C</td><td>Chilled</td><td>Slight cold stress; comfortable with a light jacket</td></tr>
<tr><td><span class="swatch" style="background:#4a8a3a"></span>18 to 24 °C</td><td>Comfortable</td><td>No thermal stress; ideal outdoor conditions</td></tr>
<tr><td><span class="swatch" style="background:#f8e554"></span>24 to 27 °C</td><td>Warm</td><td>Mild heat stress; still comfortable for most activity</td></tr>
<tr><td><span class="swatch" style="background:#f5aa54"></span>27 to 32 °C</td><td>Caution</td><td><ul><li>Avoid strenuous activity or exercise outdoors</li><li>Drink plenty of fluids</li><li>Wear light clothing</li></ul></td></tr>
<tr><td><span class="swatch" style="background:#f5884a"></span>32 to 41 °C</td><td>Extreme</td><td><ul><li>Take frequent breaks and spend time indoors in the air conditioning</li><li>Avoid strenuous activity or exercise outdoors</li><li>Drink plenty of fluids</li><li>Wear light clothing</li></ul></td></tr>
<tr><td><span class="swatch" style="background:#880000"></span>Above 41 °C</td><td>Danger</td><td><ul><li>Limit time spent outdoors</li><li>Stay indoors with the air conditioning on as much as possible</li><li>Avoid strenuous activity or exercise outdoors</li><li>Drink plenty of fluids</li><li>Wear light clothing</li></ul></td></tr>
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</table>
<p>
These bands follow the UTCI thermal-stress categories. The SunSoak value they colour is the
felt temperature after the rain/snow penalty, Solar Model, and mean radiant temperature are applied —
see <a href="./sunsoak.html">SunSoak &amp; the science</a> for how that number is built.
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