User`s guide

Virtual Weather Station User's Guide
-101- 03/07/06
Air speed
Number and
description
Features
kph mph
9 strong gale branches break from trees 75–87 47–54
10 storm trees uprooted; weak buildings collapse 88–101 55–63
11 violent
storm
widespread damage 102–117 64–73
12 hurricane widespread structural damage above 118 above 74
Table 20 - Beaufort Scale
11.2 Heat Stress Index
The Heat Stress Index calculates the body's reaction to heat
and humidity, or the Heat Index. High temperatures and
humidity stress the body's ability to cool itself, and heat
illness becomes a special concern during hot weather.
Do not base important decisions on this heat stress index!
Everybody's reaction to heat is different.
Scale Condition
---
Heat Index < 80 °F
Caution
80 °F < Heat Index < 90 °F
Extreme Caution
90 °F < Heat Index < 105 °F
Danger
105 °F < Heat Index > 130 °F
Extreme Danger
Heat Index > 130 °F
Table 21 - Heat Stress Index
11.3 Comfort Index
The comfort index calculates the body's reaction to heat,
cold, humidity and wind chill. High temperatures and
humidity stress the body's ability to cool itself, and low
temperature can stress the body's ability to heat itself.
Do not base important decisions on this comfort index!
Everybody's reaction to heat and cold is different.
Scale Condition
Extreme Cold
Wind chill < 0 °F
Uncomfortably Cold
0 °F < Wind chill < 30 °F
Cool
30 °F < Wind Chill < 60 °F
Comfortable
60 °F < Temperature < 80 °F
Warm
80 °F < Temperature < 90 °F
Uncomfortably Hot
Temperature > 90 °F and Heat
Index < 100 °F
Extreme Hot
Heat Index > 100 °F
Table 22 - Comfort Index