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# What is the function of Beaufort scale?

What is the function of Beaufort scale? The Beaufort scale is a scale for measuring wind speeds. It is based on observation rather than accurate measurement. It is the most widely used system to measure wind speed today. The scale was developed in 1805 by Francis Beaufort, an officer of the Royal Navy and first officially used by HMS Beagle.

## What is low wind speed?

Beaufort Wind Scale

0 — Calm. less than 1 mph (0 m/s) Smoke rises vertically. 1 — Light air. 1 – 3 mph.

## What Is a Force 7 wind speed?

How is wind speed measured?

Wind Force Description Wind Speed
6 Strong Breeze 22-27
7
Near Gale
28-33
8 Gale 34-40
9 Strong Gale 41-47

Jul 19, 2018

## What is 7 on the Beaufort scale?

Modern scale

Beaufort number Description Wind speed
6 Strong breeze 10.8–13.8 m/s
7
High wind,

moderate gale,

near gale
28–33 knots
32–38 mph
50–61 km/h

## How do you read a Beaufort scale?

How to read the Beaufort scale chart?

1. 0 — calm. Wind speed: < 0.5 m/s (< 1 mph). …
2. 1 — light air. Wind speed: 0.5–1.5 m/s (1–3 mph). …
3. 2 — light breeze. Wind speed: 1.6–3.3 m/s (4–7 mph). …
4. 3 — gentle breeze. …
5. 4 — moderate breeze. …
6. 5 — fresh breeze. …
7. 6 — strong breeze. …
8. 7 — high wind, moderate gale, near gale.

## What speed wind is strong?

Beaufort number Description Speed
6 Strong Breeze 25 to 31 mph
7 Near Gale 32 to 38 mph
8 Gale 39 to 46 mph
9 Strong Gale
47 to 54 mph

## Is 28 km/h wind strong?

When a wind direction is mentioned without a wind speed descriptor, we mean that the wind will be moderate. For example, the phrase ‘northerly wind’ would describe a wind blowing from the north, at a speed between 20 to 28 km/h. frequent gusts exceeding 110 km/h.

## What is a comfortable wind speed?

4–6 m/s (9–13 mph) Pedestrian Standing (or sitting for a short time or exposure) 6–8 m/s (13–18 mph) Pedestrian Walking. 8–10 m/s (18–22 mph)

## Is 45 km wind strong?

30 to 39 km/h Small trees start to sway. 40 to 50 km/h Strong enough to break umbrellas and move large tree branches. 51 to 62 km/h Walking will be tough. … By 75 km/h, the wind is strong enough to damage structures.

## Is 30 mph wind strong?

Sustained wind speeds around 20 mph, or frequent gusts of 25 to 30 mph.  » No Discernable Threat to Life and Property from High Wind. » The sustain wind speeds are non-threatening; « breezy » conditions may still be present. Note: In « High Wind » conditions, small branches break off trees and loose objects are blown about.

## Is 28 km wind strong?

30 to 39 km/h Small trees start to sway. 40 to 50 km/h Strong enough to break umbrellas and move large tree branches. 51 to 62 km/h Walking will be tough. … By 75 km/h, the wind is strong enough to damage structures.

## Is 20 winds a strong wind?

For example, when the average wind speed is 25 knots, it is normal to experience gusts of 35 knots and lulls of lighter winds.

Wind warnings and gusts.

Average wind speed (knots) Gust strength that should be planned for (knots) Wind Warning thresholds
10 14
15 21
20 28
26 – 33 36 – 45 Strong wind warning issued

## What force is 30 mph wind?

JetStream Max: Beaufort Wind Force Scale

Beaufort Wind Force Wind Average Sea State
4 13 kt 16 mph 24 km/h Moderate
5 19 kt 22 mph 34 km/h Rough
6 24 kt 28 mph 44 km/h Very Rough
7 30 kt 35 mph 56 km/h
High

## How fast does wind need to be to knock someone over?

Knocking you down would take a wind of at least 70 mph. The terminal velocity, which is the wind speed (falling speed) where the force of the wind equals the force of gravity, for a person is about 120 mph — that would likely knock you down.

## Is 10 mph wind fast?

Breezy is described as a sustained wind speed from 15-25 mph. Windy is a sustained wind speed from 20-30 mph. … Sustained winds between 30-40 mph.

The winds of 15-25 mph, with gusts of up to 45 mph, may blow around unsecured objects, take down tree limbs and potentially cause power outages. … – at 55 to 63 mph, entire trees can be uprooted and considerable structural damage can occur. – above 64 mph, expect widespread structural damage.

## Can you walk in 50 mph wind?

20-30 is kind of strong breeze and a bit more. 50-60 is hard to hear in but still possible to walk into. You may find yourself leaning into it. It is tiring to walk into and of course excellent to walk behind.

## Is 30 mph wind strong?

“A Wind Advisory means that sustained winds of 30 mph for one hour and/or frequent gusts of at least 45 mph are occurring or expected within the next 36 hours. These winds will make it difficult to drive high profile vehicles. Small, unsecured objects may be blown around by these winds.

## How much wind is windy?

Windy is a sustained wind speed from 20-30 mph. What makes a very windy day? Sustained winds between 30-40 mph.

## What wind speed is strong?

Beaufort number Description Speed
4 Moderate Breeze 13 to 18 mph
5 Fresh Breeze 19 to 24 mph
6 Strong Breeze
25 to 31 mph
7 Near Gale 32 to 38 mph

## Can you walk in 30 mph winds?

Walking in a 30 mph wind can be tricky, at 40 mph you could be blown off balance and at 60 mph it is almost impossible to walk. The wind speed given by the BBC or local radio station will be at sea level. … At 900m above sea level the wind could be blowing about three times stronger than at sea level.

## What do 25 mph winds feel?

– at 25 to 31 mph, large branches will be in motion, whistling will be heard in overhead wires, and umbrella use becomes difficult if not impossible. – at 32 to 38 mph, whole trees will be in motion. You’ll experience some difficulty when walking into the wind. … – at 47 to 54 mph, there will be light structural damage.

## Is 10 mph winds strong?

Breezy is described as a sustained wind speed from 15-25 mph. Windy is a sustained wind speed from 20-30 mph. … Sustained winds between 30-40 mph.

## Is 45 km/h wind strong?

30 to 39 km/h Small trees start to sway. 40 to 50 km/h Strong enough to break umbrellas and move large tree branches. 51 to 62 km/h Walking will be tough. … And 118 km/h wind is considered hurricane force…but happily it doesn’t get that windy every day.