P4 Related Information

Davis Vantage Pro2 Plus with
 wind, solar, and UV sensors
OregonWMR200 wind sensors

Stevenson Screen used for protecting
thermometers and remote sensors,
barographs, and thermographs against
solar radiation

     

UV Index and Skin Type

UV Index	Danger Level
0-2	Low
3-5	Moderate
6-7	High
8-10	Very High
11+	Extremely High

Skin Type	Tan	Burn	Hair Colour	Eye Colour
1	Never	Always	Red	Blue
2	Sometimes	Always	Blonde	Blue/Green
3	Always	Rarely	Brown	Gray/Brown
4	Always	Never	Black	Brown

Heat Index

Temperature Range	Warning	Meaning
27°C - 32°C (80°F - 89°F)	Caution	Possibility of heat exhaustion
32°C - 40°C (90°F - 104°F)	Extreme Caution	Possibility of heat dehydration
41°C - 54°C (105°F - 129°F)	Danger	Heat exhaustion likely
54°C - 92°C (130°F - 151°F)	Extreme Danger	Strong risk of dehydration / sun stroke

Beaufort Wind Scale

Force	Description and MPH	Land Specifications	Sea Specifications
0	Calm          0-1 mph	Calm; Smoke rises vertically	Sea like a mirror
1	Light air     1-3 mph	Direction of wind shown by smoke drift, but not by wind vanes	Ripples with the appearance of scales are formed, but without foam crests
2	Lt breeze   4-7 mph	Wind felt on face; leaves rustle; ordinary vane moved by wind	Small wavelets, still short but more pronounced. Crests have a glassy appearance and do not break
3	Gentle breeze         8-12 mph	Leaves and small twigs in constant motion; wind extends light flag	Large wavelets. Crests begin to break. Foam of glassy appearance. Perhaps scattered white horses
4	Moderate breeze       13-18 mph	Raises dust and loose paper; small branches are moved	Small waves, becoming longer; fairly frequent white horses
5	Fresh breeze       19-24 mph	Small trees in leaf begin to sway; crested wavelets form on inland waters	Moderate waves, taking a more pronounced long form; many white horses are formed. Chance of some spray
6	Strong breeze       25-31 mph	Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty	Large waves begin to form; the white foam crests are more extensive everywhere. Probably some spray
7	Near gale   32-38 mph	Whole trees in motion; inconvenience felt when walking against wind	Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind
8	Fresh gale 39-46 mph	Breaks twigs off trees; generally impedes progress	Moderately high waves of greater length; edges of crests begin to break into the spindrift. The foam is blown in well marked streaks along the direction of the wind
9	Strong gale 47-54 mph	Slight structural damage occurs (chimney pots and slates removed)	High waves. Dense streaks of foam along the direction of the wind. Crests of waves being to topple, tumble and roll over. Spray may affect visibility
10	Whole gale 55-63 mph	Seldom experienced inland; trees uprooted; considerable structural damage occurs	Very high waves with long overhanging crests. The resulting foam, in great patches, is blown in dense white streaks along the direction of the wind. On the whole the surface of the sea takes a white appearance. The 'tumbling' of the sea becomes heavy and shock-like. Visibility affected
11	Storm         64-72 mph	Very rarely experienced; accompanied by widespread damage	Exceptionally high waves (small and medium-sized ships might be for a time lost to view behind the waves). The sea is completely covered with long white patches of foam lying along the direction of the wind. Everywhere the edges of the wave crests are blown into froth. Visibility affected
12	Hurricane   73-82 mph	--	The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected