Local Weather

La Libertad 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for La Libertad

Egypt

Long range weather outlook for La Libertad includes 14 day forecast summary:

Reviewing the forecast for La Libertad Over the next 14 days and the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 24°C expected on the afternoon of Monday 15th. The mean minimum temperature will be 20°C, dipping to its lowest on the morning of Tuesday 16th at 20°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 12
Aug
17:00

WSW
WSW

8 / 9 mph 74 / 78°F 79% 1017 mb
Low level cloud: 69%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

WSW
WSW

10 / 12 mph 72 / 76°F 77% 1014 mb
Low level cloud: 43%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

12 / 13 mph 70 / 71°F 79% 1012 mb
Low level cloud: 74%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 13
Aug
02:00

WSW
WSW

8 / 10 mph 70 / 70°F 82% 1013 mb
Low level cloud: 96%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

WSW
WSW

9 / 12 mph 69 / 69°F 83% 1015 mb
Low level cloud: 89%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

WSW
WSW

9 / 10 mph 69 / 69°F 84% 1015 mb
Low level cloud: 87%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

SW
SW

9 / 10 mph 72 / 77°F 85% 1015 mb
Low level cloud: 96%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SSW
SSW

9 / 11 mph 74 / 78°F 85% 1016 mb
Low level cloud: 100%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

SSW
SSW

10 / 11 mph 74 / 78°F 82% 1017 mb
Low level cloud: 93%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

WSW
WSW

9 / 10 mph 72 / 76°F 78% 1015 mb
Low level cloud: 56%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

11 / 13 mph 71 / 71°F 79% 1013 mb
Low level cloud: 60%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 14
Aug
02:00

WSW
WSW

10 / 11 mph 69 / 69°F 84% 1014 mb
Low level cloud: 99%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

SW
SW

9 / 12 mph 68 / 69°F 85% 1016 mb
Low level cloud: 97%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

SW
SW

11 / 12 mph 69 / 69°F 87% 1016 mb
Low level cloud: 87%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
11:00

SW
SW

10 / 12 mph 72 / 77°F 86% 1015 mb
Low level cloud: 98%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
14:00

SSW
SSW

10 / 11 mph 74 / 78°F 85% 1015 mb
Low level cloud: 90%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

SW
SW

10 / 11 mph 74 / 78°F 81% 1017 mb
Low level cloud: 89%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

WSW
WSW

12 / 13 mph 72 / 76°F 78% 1015 mb
Low level cloud: 66%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

12 / 14 mph 71 / 71°F 80% 1013 mb
Low level cloud: 76%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 15
Aug
02:00

WSW
WSW

9 / 11 mph 69 / 69°F 83% 1014 mb
Low level cloud: 89%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

SW
SW

10 / 14 mph 68 / 68°F 83% 1016 mb
Low level cloud: 93%
Mid level cloud: 11%
High level cloud: 5%
Most Significant Cloud Type: low
97%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

SW
SW

11 / 13 mph 69 / 69°F 84% 1015 mb
Low level cloud: 98%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

SW
SW

10 / 12 mph 73 / 77°F 86% 1014 mb
Low level cloud: 86%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: low
92%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

8 / 9 mph 75 / 79°F 83% 1014 mb
Low level cloud: 89%
Mid level cloud: 8%
High level cloud: 31%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

WSW
WSW

9 / 11 mph 75 / 78°F 79% 1015 mb
Low level cloud: 66%
Mid level cloud: 6%
High level cloud: 73%
Most Significant Cloud Type: low
76%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

WSW
WSW

11 / 13 mph 72 / 76°F 79% 1012 mb
Low level cloud: 55%
Mid level cloud: 9%
High level cloud: 60%
Most Significant Cloud Type: low
65%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

11 / 13 mph 70 / 71°F 81% 1011 mb
Low level cloud: 76%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
80%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 16
Aug
02:00

SW
SW

12 / 15 mph 69 / 69°F 84% 1013 mb
Low level cloud: 91%
Mid level cloud: 10%
High level cloud: 27%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

SW
SW

11 / 15 mph 68 / 68°F 82% 1015 mb
Low level cloud: 92%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

SSW
SSW

10 / 11 mph 69 / 69°F 82% 1014 mb
Low level cloud: 89%
Mid level cloud: 13%
High level cloud: 18%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

SW
SW

8 / 9 mph 72 / 77°F 82% 1013 mb
Low level cloud: 90%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: low
94%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

7 / 9 mph 75 / 78°F 81% 1013 mb
Low level cloud: 85%
Mid level cloud: 11%
High level cloud: 50%
Most Significant Cloud Type: low
94%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

WSW
WSW

7 / 8 mph 75 / 78°F 77% 1014 mb
Low level cloud: 64%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: low
69%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

W
W

11 / 13 mph 72 / 76°F 76% 1012 mb
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: low
34%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

W
W

13 / 15 mph 70 / 70°F 80% 1010 mb
Low level cloud: 68%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: low
74%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 17
Aug
02:00

WSW
WSW

9 / 11 mph 69 / 69°F 83% 1011 mb
Low level cloud: 99%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

WSW
WSW

9 / 12 mph 68 / 68°F 84% 1013 mb
Low level cloud: 92%
Mid level cloud: 19%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

W
W

9 / 11 mph 69 / 69°F 85% 1013 mb
Low level cloud: 89%
Mid level cloud: 18%
High level cloud: 8%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

WSW
WSW

9 / 10 mph 72 / 77°F 85% 1013 mb
Low level cloud: 99%
Mid level cloud: 24%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SW
SW

9 / 10 mph 74 / 78°F 85% 1014 mb
Low level cloud: 94%
Mid level cloud: 20%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

SW
SW

8 / 9 mph 74 / 78°F 81% 1015 mb
Low level cloud: 95%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

WSW
WSW

10 / 11 mph 72 / 76°F 80% 1013 mb
Low level cloud: 90%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

9 / 11 mph 71 / 71°F 80% 1011 mb
Low level cloud: 81%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
84%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 18
Aug
02:00

SW
SW

8 / 9 mph 69 / 69°F 83% 1013 mb
Low level cloud: 90%
Mid level cloud: 13%
High level cloud: 19%
Most Significant Cloud Type: low
96%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

SW
SW

9 / 12 mph 68 / 68°F 84% 1014 mb
Low level cloud: 88%
Mid level cloud: 10%
High level cloud: 60%
Most Significant Cloud Type: low
98%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

SW
SW

9 / 10 mph 69 / 69°F 87% 1013 mb
Low level cloud: 95%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

SSW
SSW

9 / 11 mph 72 / 77°F 87% 1012 mb
Low level cloud: 100%
Mid level cloud: 26%
High level cloud: 60%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

SSW
SSW

10 / 11 mph 74 / 78°F 87% 1013 mb
Low level cloud: 96%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

SSW
SSW

9 / 10 mph 74 / 78°F 83% 1014 mb
Low level cloud: 94%
Mid level cloud: 15%
High level cloud: 8%
Most Significant Cloud Type: low
99%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

SW
SW

11 / 12 mph 72 / 76°F 79% 1012 mb
Low level cloud: 72%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

WSW
WSW

12 / 14 mph 71 / 71°F 81% 1011 mb
Low level cloud: 47%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 19
Aug
02:00

SW
SW

9 / 11 mph 69 / 69°F 84% 1012 mb
Low level cloud: 89%
Mid level cloud: 12%
High level cloud: 21%
Most Significant Cloud Type: low
96%
0.00 In
08:00

SSW
SSW

12 / 14 mph 69 / 69°F 87% 1014 mb
Low level cloud: 89%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.00 In
14:00

SW
SW

9 / 11 mph 71 / 71°F 84% 1014 mb
Low level cloud: 89%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.01 In
20:00

WSW
WSW

12 / 14 mph 72 / 76°F 76% 1013 mb
Low level cloud: 53%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.00 In
Sat 20
Aug
02:00

SW
SW

11 / 13 mph 69 / 69°F 83% 1012 mb
Low level cloud: 22%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.00 In
08:00

SW
SW

11 / 13 mph 69 / 69°F 84% 1014 mb
Low level cloud: 94%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

9 / 10 mph 71 / 71°F 84% 1014 mb
Low level cloud: 85%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.01 In
20:00

WSW
WSW

11 / 13 mph 73 / 77°F 77% 1012 mb
Low level cloud: 46%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.00 In
Sun 21
Aug
02:00

SW
SW

10 / 12 mph 69 / 69°F 82% 1012 mb
Low level cloud: 90%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: low
95%
0.00 In
08:00

SW
SW

8 / 9 mph 69 / 69°F 82% 1013 mb
Low level cloud: 96%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

6 / 6 mph 75 / 79°F 81% 1013 mb
Low level cloud: 87%
Mid level cloud: 31%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.00 In
20:00

WSW
WSW

12 / 14 mph 72 / 76°F 75% 1013 mb
Low level cloud: 57%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.00 In
Mon 22
Aug
02:00

W
W

10 / 12 mph 69 / 69°F 83% 1012 mb
Low level cloud: 49%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
60%
0.00 In
08:00

WSW
WSW

7 / 11 mph 67 / 67°F 83% 1013 mb
Low level cloud: 89%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

7 / 8 mph 75 / 78°F 85% 1013 mb
Low level cloud: 99%
Mid level cloud: 23%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.01 In
20:00

WSW
WSW

11 / 14 mph 70 / 70°F 79% 1013 mb
Low level cloud: 90%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
93%
0.00 In
Tue 23
Aug
02:00

WSW
WSW

10 / 12 mph 69 / 69°F 82% 1012 mb
Low level cloud: 25%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: low
34%
0.00 In
08:00

SW
SW

10 / 13 mph 67 / 67°F 85% 1014 mb
Low level cloud: 99%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.01 In
14:00

SW
SW

9 / 10 mph 74 / 78°F 84% 1013 mb
Low level cloud: 88%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.01 In
20:00

WSW
WSW

12 / 13 mph 71 / 71°F 76% 1012 mb
Low level cloud: 59%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.00 In
Wed 24
Aug
02:00

WSW
WSW

10 / 12 mph 69 / 69°F 83% 1012 mb
Low level cloud: 28%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.00 In
08:00

SW
SW

10 / 15 mph 67 / 67°F 83% 1013 mb
Low level cloud: 92%
Mid level cloud: 23%
High level cloud: 53%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

6 / 8 mph 76 / 80°F 82% 1013 mb
Low level cloud: 82%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.01 In
20:00

WSW
WSW

12 / 14 mph 70 / 70°F 77% 1013 mb
Low level cloud: 57%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
64%
0.00 In
Thu 25
Aug
02:00

WSW
WSW

10 / 11 mph 69 / 69°F 83% 1012 mb
Low level cloud: 55%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: low
59%
0.00 In
08:00

SSW
SSW

8 / 11 mph 67 / 67°F 82% 1013 mb
Low level cloud: 88%
Mid level cloud: 22%
High level cloud: 70%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

6 / 7 mph 76 / 80°F 84% 1013 mb
Low level cloud: 87%
Mid level cloud: 36%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.00 In
20:00

WSW
WSW

11 / 13 mph 70 / 71°F 76% 1013 mb
Low level cloud: 33%
Mid level cloud: 16%
High level cloud: 14%
Most Significant Cloud Type: low
39%
0.00 In
Fri 26
Aug
02:00

WSW
WSW

10 / 12 mph 69 / 69°F 83% 1012 mb
Low level cloud: 12%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.00 In
08:00

SSW
SSW

7 / 9 mph 68 / 68°F 83% 1014 mb
Low level cloud: 95%
Mid level cloud: 29%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

7 / 9 mph 76 / 80°F 81% 1014 mb
Low level cloud: 87%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.00 In
20:00

W
W

11 / 12 mph 71 / 71°F 77% 1014 mb
Low level cloud: 38%
Mid level cloud: 15%
High level cloud: 12%
Most Significant Cloud Type: low
44%
0.00 In
Sat 27
Aug
02:00

SW
SW

12 / 15 mph 69 / 69°F 84% 1012 mb
Low level cloud: 50%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.00 In
08:00

SW
SW

8 / 11 mph 68 / 68°F 84% 1014 mb
Low level cloud: 94%
Mid level cloud: 25%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.00 In
14:00

SW
SW

5 / 6 mph 76 / 80°F 80% 1014 mb
Low level cloud: 83%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.00 In
20:00

W
W

11 / 12 mph 71 / 71°F 77% 1013 mb
Low level cloud: 36%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
39%
0.00 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