Weather Information You Can USE

Storm Warning Signals

Wind-Waves

Beaufort Scale

Temperature Conversions

Weather Map Symbols

Marine Forecasts
Local
Regional
National

Satellite Imagery

Storm Tracking


Swells & Conditions

Weather Phenomena


Weather Education

International Weather

Other Weather Sites

Storm Warning Signals


Wind-Waves

Beaufort Scale

Temperature Conversions

Storm Warning Signals
Small Craft Advisory
 Forecast winds of 18 to 33 knots

Gale Warning:
Forecast winds of 34 to 47 knots. 

Storm Warning:
Forecast winds of 48 knots or greater.
Tropical Storm Warning:
Forecast winds of 34 to 63 knots associated with a tropical storm.



Hurricane Warning:
Winds of 64 knots plus associated with a hurricane.

Wind Speed/Surface Height/Wind Knots/Wave Conditions

0-3 Kts - Smooth, Surface Calm
4-6 Kts - Ripples, Under 1 ft.
7-10 Kts - Smooth Wavelets, 1 - 2 ft.
11-16 Kts - Little Waves, 2 4 ft.
17-21 Kts - Moderate Waves, whitecaps, 4 - 8 ft.
22-27 Kts - Big Waves, spray, 8 13 ft.
28-33 Kts - Heaped Seas, Foam from breaking waves, 13 - 20 ft.
34-40 Kts - High Waves, Foam blown in well-marked streaks, 13 -20 ft.
41-47 Kts - Seas Roll, Spray may reduce visibility, 13 - 20 ft.
48-55 Kts - Very High Waves, White Seas, Overhanging Crests, 20 - 30 ft.
56-63 Kts - Exceptionally High Waves, 30 - 45 ft.
63 + Kts - Air filled with foam, Seas completely white, over 45 ft.
 
Beaufort Wind Scale
0 under 1 knot
1 - Light Air 1 - 3 knots Or just sufficient to give steerage way.
2 - Light Breeze 4 - 6 knots Or that in which a man-of-war with
3 - Gentle Breeze 7 - 10 knots all sail set, and clean full would go
4 - Moderate Breeze 11 - 16 knots in smooth water from.
5 - Fresh Breeze 17 - 21 knots Or that to which 
6 - Strong Breeze 22 - 27 knots a well-conditioned
7 - Moderate Gale 28 - 33 knots man-of-war could just 
8 - Fresh Gale 34 - 40 knots carry in chase,
9 - Strong Gale 41 - 47 knots full an by
10 - Whole Gale 48 - 55 knots or that with which she could scarcely bear close-reefed main-topsail and reefed fore-sail
11 - Storm 56 - 63 knots Or that which would reduce her to storm staysails.
12 - Hurricane 64 and over Or that which no canvas could withstand.
Temperature Conversions
To convert Fahrenheit temperatures into Celsius
Begin by subtracting 32 from the Fahrenheit number. 
Divide the answer by 9. 
Then multiply that answer by 5. 

Here's an example: Change 81 degrees Fahrenheit to Celsius: 81 minus 32 is 49. Then, 48 divided by 9 is 5.3. Finally, 5.3 times 5 is 26.5 degrees Celsius. 
To convert Celsius temperatures into Fahrenheit:
Begin by multiplying the Celsius temperature by 9. 
Divide the answer by 5. 
Now add 32. 

Here's an example: Change 32 degrees Celsius to Fahrenheit: 32 times 9 is 288. Then 288 divided by 5 is 57.6. Finally, 57.6 plus 32 is 89.6 degrees Fahrenheit. 

What do all those little squiggles and arrows mean on the weather chart? Thanks to UCSD, you can find out on the Weather Station Plot and Common Weather Symbols page they host. thanks!

Do you have an interesting link or story about your sailing experience with WEATHER! 
E-mail it to us & we'll post it for the world to learn! 
copyright Makai Promotions 1997-98-99-2000FB
 Web-Design by Makai Promotions
Return to Sailors Choice