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Old 14-08-2012, 08:22   #1
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Number On a Wind Map - What Does It Mean ?

Could someone please enlighten me as to the meaning of the number underneath the wind arrows on the HNMS maps where the station circle would usually be?

Example here: Wind Maps

Is this the wind speed in knots per hour?
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Old 21-08-2012, 22:56   #2
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Link doesn't work for me.

On any weather map I've seen the arrow points in the direction of the wind and the little hockey stick ends are the speed. Long stick = 10 knots, short stick = 5 knots. So a hockey stick with two long and one short is 25 knots.
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Old 22-08-2012, 00:29   #3
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Re: Number On A Wind Map - What Does It Mean?

Link Didn't work for me either but I was able to navigate to the home page and find it - attached.

It appears that as Rebel says, the tail choices are 5 knot or 10 knots that the forecasting site rounds the tail upwards - i.e. 26 knots is 3 long tails and also prints the actual predicted number.
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Old 22-08-2012, 02:28   #4
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Re: Number On A Wind Map - What Does It Mean?

Just to expand a bit on the numbers.

As noted by Ex-Calif, the numbers are the precise wind speed in knots, rather than in 5 knot increments as represented by the tails. Note that the tails do not represent the closest 5 knot increment (as I had assumed), but the next higher increment.

So 6-10 knots would be shown with a large tail, and 11-15 knots by a large tail and a small one.
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Old 22-08-2012, 05:49   #5
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Re: Number On A Wind Map - What Does It Mean?

Some useful weather info', from my gallery:

Good Old Boat Article on “How to Read Weather Maps”:

36 ➥ Weather Basics - How to read weather maps Cruisers & Sailing Photo Gallery

37 ➥ Weather Basics - How to read weather maps Cruisers & Sailing Photo Gallery

38 ➥ Weather Basics - Page 38 - Weather Cruisers & Sailing Photo Gallery

39 ➥ Weather Basics - How to read a weather map Cruisers & Sailing Photo Gallery
Weather Basics - How to read weather maps Cruisers & Sailing Photo Gallery


WX Symbols ➥ Weather Chart Symbols - Cruisers & Sailing Photo Gallery

Locating Lows ➥ Locating Low Pressure Systems - Weather Cruisers & Sailing Photo Gallery

Cyclone Evasion ➥ Cyclone Evasion - Cyclone Evasion in the Southern Hemisphere Cruisers & Sailing Photo Gallery

Global Weather ➥ Global Weather - GENERAL GLOBAL SCALE WEATHER AND FRONTOGENESIS: Cruisers & Sailing Photo Gallery

Global Wind Patterns ➥ Global Wind Patterns - Cruisers & Sailing Photo Gallery

Barometric Pressure Conversions ➥ Barometric Pressure Conversions - Barometric Pressure Conversions Cruisers & Sailing Photo Gallery
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Old 22-08-2012, 06:06   #6
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Re: Number On A Wind Map - What Does It Mean?

When you start seeing triangular pennants on the end of the hockey stick, you know you're in trouble. . . .
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Old 22-08-2012, 07:10   #7
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Re: Number On A Wind Map - What Does It Mean?

Quote:
Originally Posted by EViS View Post
Is this the wind speed in knots per hour?
Not to be too pedantic, but you don't say 'knots per hour' as knot = nautical mile per hour.
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