Local Weather

Xichang 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Xichang

China

Long range weather outlook for Xichang includes 14 day forecast summary:

For Xichang in the coming two weeks the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 29°C expected on the afternoon of Tuesday 17th. The average minimum temperature will be 1°C, dipping to its lowest on the morning of Wednesday 11th at -2°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 09
Feb
17:00

S
S

11 / 13 mph 80 / 76°F 19% 1004 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SSE
SSE

6 / 12 mph 49 / 47°F 36% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

SSE
SSE

2 / 5 mph 44 / 43°F 40% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 10
Feb
02:00

ESE
ESE

1 / 2 mph 40 / 40°F 46% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

E
E

1 / 3 mph 37 / 37°F 52% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

ENE
ENE

1 / 2 mph 34 / 34°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

W
W

2 / 2 mph 67 / 66°F 37% 1015 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

4 / 4 mph 78 / 76°F 27% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

8 / 9 mph 81 / 77°F 23% 1006 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

E
E

6 / 12 mph 47 / 44°F 44% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NNE
NNE

6 / 13 mph 36 / 30°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 11
Feb
02:00

NNE
NNE

4 / 8 mph 32 / 28°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NNE
NNE

2 / 5 mph 30 / 28°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

2 / 4 mph 28 / 28°F 85% 1025 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

W
W

2 / 2 mph 62 / 61°F 51% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

3 / 4 mph 74 / 75°F 34% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

6 / 7 mph 79 / 76°F 27% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SE
SE

5 / 11 mph 47 / 45°F 42% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

ESE
ESE

2 / 4 mph 44 / 44°F 44% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 12
Feb
02:00

ENE
ENE

1 / 2 mph 40 / 40°F 52% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

2 / 3 mph 36 / 36°F 58% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

1 / 2 mph 34 / 34°F 62% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

SW
SW

2 / 3 mph 68 / 66°F 39% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SSW
SSW

3 / 3 mph 79 / 76°F 27% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

7 / 8 mph 82 / 78°F 23% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SE
SE

5 / 10 mph 52 / 51°F 39% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

E
E

2 / 4 mph 46 / 46°F 42% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 13
Feb
02:00

NE
NE

4 / 9 mph 40 / 37°F 58% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NNE
NNE

4 / 9 mph 33 / 29°F 80% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NE
NE

3 / 6 mph 31 / 28°F 87% 1021 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

WNW
WNW

2 / 3 mph 66 / 64°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

WSW
WSW

4 / 5 mph 76 / 75°F 35% 1010 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

7 / 9 mph 80 / 77°F 25% 1004 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

ESE
ESE

5 / 10 mph 49 / 47°F 33% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

NE
NE

3 / 6 mph 43 / 42°F 44% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 14
Feb
02:00

NNE
NNE

3 / 6 mph 39 / 37°F 65% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NNE
NNE

2 / 5 mph 36 / 35°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NNE
NNE

2 / 4 mph 34 / 34°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

W
W

2 / 2 mph 67 / 65°F 49% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

4 / 4 mph 78 / 76°F 28% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

7 / 9 mph 82 / 77°F 20% 1004 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: medium
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

ESE
ESE

4 / 10 mph 49 / 47°F 35% 1009 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

E
E

2 / 4 mph 44 / 44°F 40% 1012 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 15
Feb
02:00

NE
NE

2 / 4 mph 42 / 42°F 47% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

2 / 4 mph 38 / 38°F 54% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

NNE
NNE

1 / 2 mph 35 / 35°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

WSW
WSW

2 / 2 mph 69 / 67°F 40% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

3 / 4 mph 79 / 76°F 25% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

S
S

7 / 8 mph 82 / 78°F 20% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SE
SE

5 / 10 mph 49 / 47°F 35% 1010 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

ENE
ENE

3 / 6 mph 44 / 44°F 37% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 16
Feb
02:00

NE
NE

2 / 4 mph 44 / 44°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
08:00

ENE
ENE

1 / 2 mph 38 / 38°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
14:00

SSW
SSW

3 / 3 mph 84 / 81°F 24% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
20:00

SE
SE

5 / 10 mph 50 / 49°F 35% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Tue 17
Feb
02:00

NE
NE

3 / 6 mph 43 / 42°F 42% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
08:00

E
E

1 / 2 mph 37 / 37°F 49% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
14:00

S
S

6 / 7 mph 82 / 79°F 20% 1003 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
20:00

SE
SE

6 / 13 mph 50 / 48°F 31% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Wed 18
Feb
02:00

NE
NE

1 / 2 mph 44 / 44°F 43% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
08:00

NE
NE

3 / 5 mph 37 / 36°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.00 In
14:00

SSW
SSW

6 / 7 mph 84 / 80°F 19% 1000 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
20:00

ENE
ENE

6 / 13 mph 49 / 47°F 42% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.00 In
Thu 19
Feb
02:00

S
S

3 / 6 mph 45 / 44°F 36% 1004 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
08:00

NNE
NNE

5 / 7 mph 35 / 31°F 66% 1028 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.00 In
14:00

S
S

9 / 10 mph 83 / 79°F 16% 1000 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
20:00

ENE
ENE

5 / 11 mph 44 / 41°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.00 In
Fri 20
Feb
02:00

NE
NE

5 / 8 mph 38 / 34°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.00 In
08:00

NE
NE

2 / 3 mph 32 / 32°F 78% 1024 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.00 In
14:00

NNW
NNW

4 / 5 mph 71 / 71°F 33% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.00 In
20:00

ENE
ENE

3 / 6 mph 48 / 47°F 64% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
0.02 In
Sat 21
Feb
02:00

N
N

3 / 4 mph 52 / 52°F 86% 1025 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
65%
0.07 In
08:00

NNE
NNE

2 / 3 mph 37 / 37°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.01 In
14:00

SW
SW

4 / 4 mph 74 / 76°F 42% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.01 In
20:00

SSE
SSE

6 / 12 mph 52 / 51°F 42% 1004 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Sun 22
Feb
02:00

NE
NE

1 / 2 mph 41 / 41°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In
08:00

SE
SE

1 / 2 mph 40 / 40°F 61% 1007 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.00 In
14:00

SSW
SSW

4 / 4 mph 78 / 79°F 39% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.00 In
20:00

ESE
ESE

6 / 13 mph 51 / 49°F 34% 1000 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.00 In
Mon 23
Feb
02:00

SSE
SSE

1 / 2 mph 44 / 44°F 76% 1009 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.00 In
08:00

ENE
ENE

1 / 2 mph 36 / 36°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
0.00 In
14:00

S
S

6 / 7 mph 81 / 81°F 40% 999 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.00 In
20:00

NE
NE

7 / 9 mph 58 / 57°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
0.04 In
Tue 24
Feb
02:00

NE
NE

2 / 3 mph 49 / 50°F 64% 1005 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.00 In
08:00

ENE
ENE

4 / 6 mph 41 / 38°F 77% 1036 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.23 In
14:00

NNE
NNE

2 / 2 mph 61 / 61°F 91% 1010 mb
Low level cloud: 62%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.18 In
20:00

SSE
SSE

1 / 1 mph 49 / 49°F 94% 1029 mb
Low level cloud: 52%
Mid level cloud: 43%
High level cloud: 80%
Most Significant Cloud Type: low
77%
0.08 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