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Johnston Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Johnston Island

Alaska, United States Of America

Long range weather outlook for Johnston Island includes 14 day forecast summary:

The forecast for Johnston Island in the coming two weeks is predicting the average daytime maximum temperature will be around 30°C, with a high for the two weeks of 31°C expected on the afternoon of Monday 20th. The mean minimum temperature will be 25°C, dipping to its lowest on the morning of Saturday 18th at 23°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. It looks like Saturday 18th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		00:00

NNE
NNE

 15 / 17 mph 76 / 79°F 74% 1013 mb
Low level cloud: 89%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 13 / 16 mph 75 / 78°F 76% 1011 mb
Low level cloud: 87%
Mid level cloud: 9%
High level cloud: 8%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 11 / 14 mph 74 / 78°F 73% 1010 mb
Low level cloud: 58%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 10 / 12 mph 78 / 79°F 72% 1011 mb
Low level cloud: 67%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 8 / 9 mph 81 / 81°F 71% 1012 mb
Low level cloud: 44%
Mid level cloud: 47%
High level cloud: 2%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 6 / 7 mph 82 / 82°F 70% 1011 mb
Low level cloud: 18%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 8 / 9 mph 80 / 81°F 71% 1010 mb
Low level cloud: 27%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 8 / 11 mph 79 / 80°F 72% 1011 mb
Low level cloud: 35%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		15:00

NE
NE

 9 / 13 mph 83 / 92°F 85% 1012 mb
Low level cloud: 83%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

 8 / 16 mph 81 / 89°F 88% 1011 mb
Low level cloud: 97%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

ENE
ENE

 10 / 16 mph 81 / 84°F 87% 1013 mb
Low level cloud: 56%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

ENE
ENE

 10 / 13 mph 78 / 82°F 87% 1014 mb
Low level cloud: 82%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 11 / 16 mph 76 / 80°F 89% 1013 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

NE
NE

 11 / 18 mph 75 / 79°F 87% 1013 mb
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 13 / 16 mph 79 / 83°F 87% 1014 mb
Low level cloud: 71%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 12 / 15 mph 82 / 89°F 87% 1015 mb
Low level cloud: 71%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 11 / 18 mph 84 / 91°F 84% 1014 mb
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

E
E

 12 / 15 mph 83 / 88°F 83% 1013 mb
Low level cloud: 18%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 9 / 13 mph 82 / 84°F 85% 1013 mb
Low level cloud: 9%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 20
May		00:00

ESE
ESE

 10 / 15 mph 81 / 88°F 84% 1015 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SE
SE

 11 / 15 mph 79 / 85°F 83% 1014 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 9 / 15 mph 78 / 82°F 82% 1013 mb
Low level cloud: 29%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 9 / 11 mph 84 / 89°F 83% 1015 mb
Low level cloud: 23%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 9 / 10 mph 88 / 98°F 83% 1015 mb
Low level cloud: 26%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 9 / 11 mph 89 / 103°F 82% 1014 mb
Low level cloud: 57%
Mid level cloud: 23%
High level cloud: 17%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 11 / 13 mph 87 / 97°F 80% 1013 mb
Low level cloud: 27%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 11 / 13 mph 84 / 91°F 83% 1014 mb
Low level cloud: 26%
Mid level cloud: 23%
High level cloud: 15%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

E
E

 13 / 16 mph 81 / 89°F 84% 1015 mb
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 13 / 17 mph 80 / 85°F 81% 1014 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 82%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 11 / 18 mph 79 / 83°F 78% 1013 mb
Low level cloud: 4%
Mid level cloud: 25%
High level cloud: 40%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 11 / 13 mph 84 / 88°F 76% 1014 mb
Low level cloud: 50%
Mid level cloud: 27%
High level cloud: 50%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 13 / 15 mph 86 / 96°F 80% 1015 mb
Low level cloud: 14%
Mid level cloud: 45%
High level cloud: 38%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 12 / 13 mph 88 / 100°F 80% 1013 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 13 / 15 mph 86 / 95°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 13 / 15 mph 84 / 91°F 82% 1013 mb
Low level cloud: 16%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

E
E

 14 / 17 mph 81 / 88°F 83% 1014 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 13 / 17 mph 79 / 85°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 13 / 20 mph 78 / 83°F 81% 1012 mb
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 16 / 18 mph 83 / 88°F 83% 1014 mb
Low level cloud: 33%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 17 / 19 mph 86 / 95°F 82% 1014 mb
Low level cloud: 17%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 16 / 19 mph 88 / 99°F 82% 1014 mb
Low level cloud: 67%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 17 / 20 mph 86 / 96°F 82% 1013 mb
Low level cloud: 69%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 16 / 18 mph 84 / 91°F 85% 1014 mb
Low level cloud: 30%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

E
E

 16 / 19 mph 81 / 88°F 85% 1016 mb
Low level cloud: 40%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

 17 / 23 mph 79 / 85°F 82% 1015 mb
Low level cloud: 60%
Mid level cloud: 4%
High level cloud: 37%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 19 / 27 mph 78 / 83°F 82% 1014 mb
Low level cloud: 56%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 18 / 20 mph 82 / 87°F 82% 1015 mb
Low level cloud: 66%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 18 / 20 mph 85 / 93°F 82% 1016 mb
Low level cloud: 69%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 18 / 21 mph 86 / 96°F 82% 1016 mb
Low level cloud: 66%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 19 / 21 mph 85 / 93°F 82% 1014 mb
Low level cloud: 62%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 19 / 21 mph 83 / 90°F 86% 1015 mb
Low level cloud: 10%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		03:00

E
E

 17 / 35 mph 80 / 85°F 80% 1014 mb
Low level cloud: 31%
Mid level cloud: 30%
High level cloud: 6%
Most Significant Cloud Type: low
41%
0.0 In
09:00

ESE
ESE

 18 / 38 mph 80 / 86°F 79% 1014 mb
Low level cloud: 51%
Mid level cloud: 24%
High level cloud: 5%
Most Significant Cloud Type: low
60%
0.0 In
15:00

E
E

 19 / 39 mph 83 / 90°F 80% 1014 mb
Low level cloud: 57%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: low
66%
0.0 In
21:00

E
E

 19 / 39 mph 81 / 87°F 80% 1014 mb
Low level cloud: 63%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
Sat 25
May		03:00

E
E

 18 / 37 mph 79 / 83°F 81% 1015 mb
Low level cloud: 69%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: low
79%
0.0 In
09:00

ENE
ENE

 17 / 35 mph 80 / 86°F 80% 1015 mb
Low level cloud: 70%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: low
75%
0.0 In
15:00

ENE
ENE

 16 / 34 mph 82 / 89°F 77% 1014 mb
Low level cloud: 32%
Mid level cloud: 8%
High level cloud: 12%
Most Significant Cloud Type: low
35%
0.0 In
21:00

ENE
ENE

 16 / 34 mph 81 / 86°F 78% 1014 mb
Low level cloud: 43%
Mid level cloud: 10%
High level cloud: 12%
Most Significant Cloud Type: low
47%
0.0 In
Sun 26
May		03:00

E
E

 17 / 36 mph 78 / 83°F 80% 1014 mb
Low level cloud: 60%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
63%
0.0 In
09:00

ENE
ENE

 14 / 29 mph 80 / 85°F 80% 1013 mb
Low level cloud: 63%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
15:00

E
E

 17 / 34 mph 82 / 89°F 79% 1014 mb
Low level cloud: 53%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
21:00

E
E

 15 / 32 mph 80 / 86°F 77% 1013 mb
Low level cloud: 28%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
Mon 27
May		03:00

E
E

 18 / 38 mph 79 / 83°F 78% 1014 mb
Low level cloud: 45%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
09:00

E
E

 16 / 34 mph 81 / 87°F 80% 1013 mb
Low level cloud: 64%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
15:00

E
E

 20 / 42 mph 85 / 95°F 78% 1015 mb
Low level cloud: 57%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
21:00

E
E

 18 / 37 mph 81 / 88°F 80% 1013 mb
Low level cloud: 53%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
Tue 28
May		03:00

E
E

 20 / 43 mph 78 / 83°F 81% 1014 mb
Low level cloud: 45%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
09:00

E
E

 19 / 39 mph 80 / 86°F 80% 1014 mb
Low level cloud: 65%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
15:00

ENE
ENE

 21 / 43 mph 85 / 95°F 77% 1014 mb
Low level cloud: 21%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
21:00

E
E

 20 / 43 mph 81 / 87°F 81% 1014 mb
Low level cloud: 64%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.1 In
Wed 29
May		03:00

E
E

 21 / 43 mph 78 / 82°F 81% 1014 mb
Low level cloud: 64%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
09:00

E
E

 21 / 45 mph 79 / 85°F 80% 1014 mb
Low level cloud: 53%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.1 In
15:00

E
E

 20 / 41 mph 82 / 89°F 80% 1014 mb
Low level cloud: 63%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
21:00

ENE
ENE

 21 / 44 mph 80 / 86°F 82% 1015 mb
Low level cloud: 66%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
Thu 30
May		03:00

E
E

 21 / 45 mph 79 / 84°F 83% 1014 mb
Low level cloud: 46%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
09:00

E
E

 23 / 48 mph 81 / 87°F 81% 1015 mb
Low level cloud: 27%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
15:00

ENE
ENE

 22 / 46 mph 82 / 91°F 84% 1014 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
21:00

ENE
ENE

 23 / 47 mph 82 / 90°F 83% 1015 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
31%
0.0 In
Fri 31
May		03:00

E
E

 19 / 40 mph 79 / 84°F 82% 1015 mb
Low level cloud: 49%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
09:00

ENE
ENE

 23 / 49 mph 81 / 88°F 84% 1015 mb
Low level cloud: 44%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
15:00

ENE
ENE

 20 / 41 mph 83 / 94°F 83% 1015 mb
Low level cloud: 69%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
21:00

ENE
ENE

 22 / 46 mph 82 / 90°F 83% 1016 mb
Low level cloud: 42%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
45%
0.0 In
Sat 01
Jun		03:00

E
E

 21 / 44 mph 79 / 85°F 82% 1014 mb
Low level cloud: 67%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
09:00

ENE
ENE

 22 / 47 mph 81 / 89°F 84% 1017 mb
Low level cloud: 35%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
15:00

E
E

 20 / 42 mph 84 / 93°F 82% 1013 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
21:00

ENE
ENE

 19 / 41 mph 82 / 91°F 85% 1017 mb
Low level cloud: 23%
Mid level cloud: 16%
High level cloud: 98%
Most Significant Cloud Type: low
40%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure