FLIR Commercial Systems Inc. WTH600 Manuale Utente

14  

WTH600-en-US_v1.0   8/17

6 

Strong breeze 

39–49 km/h 

Large branches in motion. Whistling heard in 
overhead wires. Umbrella use becomes difficult. 
Empty plastic bins tip over. 

25–30 mph 
22–27 knots 
10.8–13.8 m/s 

7 

High wind 

50–61 km/h 

Whole trees in motion. Effort needed to walk against 
the wind. 

31–38 mph 
28–33 knots 
13.9–17.1 m/s 

8 

Gale 

62–74 km/h 

Some twigs broken from trees. Cars veer on road. 
Progress on foot is seriously impeded. 

39–46 mph 
34–40 knots 
17.2–20.7 m/s 

9 

Strong gale 

75–88 km/h 

Some branches break off trees, and some small trees 
blow over. Construction/temporary signs and 
barricades blow over. 

47–54 mph 
41–47 knots 
20.8–24.4 m/s 

10 

Storm 

89–102 km/h 

Trees are split or uprooted, structural damage likely. 

55–63 mph 
48–55 knots 
24.5–28.4 m/s 

11 

Violent storm 

103–117 km/h 

Widespread vegetation and structural damage likely. 

64–73 mph 
56–63 knots 
28.5–32.6 m/s 

12 

Hurricane force 

≥ 118 km/h 

Severe widespread damage to vegetation and 
structures. Debris and unsecured objects become 
airborne. 

≥ 74 mph 
≥ 64 knots 
≥ 32.7m/s 

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. 

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. 

80°F to 90°F (27°C to 32°C) 

Caution 

Possibility of heat exhaustion 

91°F to 105°F (33°C to 40°C) 

Extreme Caution  Possibility of heat dehydration 

106°F to 129°F (41°C to 54°C) 

Danger 

Heat exhaustion likely 

≥130°F (≥55°C) 

Extreme Danger 

Strong risk of dehydration / sun stroke