Wind Chill / Heat Index / Dew Point - Extech Instruments WTH600 User Manual

6 Strong breeze
7
8
9 Strong gale
10
11 Violent storm
12 Hurricane force

11. WIND CHILL / HEAT INDEX / DEW POINT

View the Wind Chill
Press the [INDEX] button repeatedly until the WINDCHILL appears.
Note: The wind chill factor is based on the combined effects of temperature and wind speed. The
wind chill displayed is calculated solely from temperature and humidity measured by the wireless
sensor.
View the Heat Index
Press the [INDEX] button repeatedly until the HEAT INDEX appears.
Note: Heat index is only calculated when temperature is 80°F/27°C or above, and based solely from
the temperature and humidity measured by the wireless sensor.
Heat Index Range
80°F to 90°F (27°C to 32°C)
91°F to 105°F (33°C to 40°C)
106°F to 129°F (41°C to 54°C)
≥130°F (≥55°C)
14
39–49 km/h
25–30 mph
22–27 knots
10.8–13.8 m/s
High wind 50–61 km/h
31–38 mph
28–33 knots
13.9–17.1 m/s
Gale 62–74 km/h
39–46 mph
34–40 knots
17.2–20.7 m/s
75–88 km/h
47–54 mph
41–47 knots
20.8–24.4 m/s
Storm 89–102 km/h
55–63 mph
48–55 knots
24.5–28.4 m/s
103–117 km/h
64–73 mph
56–63 knots
28.5–32.6 m/s
≥ 118 km/h
≥ 74 mph
≥ 64 knots
≥ 32.7m/s
Warning
Caution
Extreme Caution
Danger
Extreme Danger
Large branches in motion. Whistling heard in
overhead wires. Umbrella use becomes difficult.
Empty plastic bins tip over.
Whole trees in motion. Effort needed to walk against
the wind.
Some twigs broken from trees. Cars veer on road.
Progress on foot is seriously impeded.
Some branches break off trees, and some small trees
blow over. Construction/temporary signs and
barricades blow over.
Trees are split or uprooted, structural damage likely.
Widespread vegetation and structural damage likely.
Severe widespread damage to vegetation and
structures. Debris and unsecured objects become
airborne.
Explanation
Possibility of heat exhaustion
Possibility of heat dehydration
Heat exhaustion likely
Strong risk of dehydration / sun stroke
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