Tropical Terms II - KALB-TV News Channel 5 & CBS 2

Tropical Terms II

 

We classify tropical systems by Maximum sustained wind speeds. This helps determine possible damage after a storm makes landfall as well as helps define the severity of a tropical system.

Hurricanes are divided into 5 different classifications better known as categories.

Saffir–Simpson Hurricane Scale 

Category

Wind speed

Storm surge

 

 

 

mph
(km/h)

ft
(m)

 

 

 

Five

≥ 156
(≥ 250)

> 18
(> 5.5)

 

 

 

Four

131–155
(210–249)

13–18
(4.0–5.5)

 

 

  

Three

111–130
(178–209)

9–12
(2.7–3.7)

 

 

  

Two

96–110
(154–177)

6–8
(1.8–2.4)

 

 

  

One

74–95
(119–153)

4–5
(1.2–1.5)

 

 

Additional classifications

  

Tropical
storm

39–73
(63–117)

0–3
(0–0.9)

 

 

  

Tropical
depression

0–38
(0–62)

0
(0)

 

 

 

 

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