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Rothera Point 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Rothera Point

Antarctica

Long range weather outlook for Rothera Point includes 14 day forecast summary:

The next 14 day outlook for Rothera Point shows the average daytime maximum temperature will be around -7°C, with a high for the two weeks of -2°C expected on the afternoon of Monday 26th. The average minimum temperature will be -14°C, dipping to its lowest on the morning of Wednesday 28th at -24°C. The fortnight ahead will have most days seeing a little snow. Current predictions suggest Monday 26th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 20
Aug
15:00

N
N

5 / 9 mph 27 / 21°F 87% 1015 mb
Low level cloud: 82%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

N
N

5 / 9 mph 26 / 20°F 88% 1015 mb
Low level cloud: 85%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

N
N

5 / 11 mph 24 / 17°F 88% 1016 mb
Low level cloud: 87%
Mid level cloud: 44%
High level cloud: 61%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Wed 21
Aug
00:00

NW
NW

2 / 4 mph 23 / 23°F 87% 1016 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

SW
SW

1 / 2 mph 16 / 16°F 92% 1016 mb
Low level cloud: 85%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNW
NNW

1 / 2 mph 20 / 20°F 96% 1016 mb
Low level cloud: 73%
Mid level cloud: 14%
High level cloud: 57%
Most Significant Cloud Type: low
85%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
09:00

NNW
NNW

2 / 5 mph 15 / 12°F 95% 1017 mb
Low level cloud: 66%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NNW
NNW

2 / 4 mph 14 / 14°F 93% 1017 mb
Low level cloud: 59%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNE
NNE

1 / 2 mph 16 / 16°F 89% 1017 mb
Low level cloud: 62%
Mid level cloud: 3%
High level cloud: 94%
Most Significant Cloud Type: low
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNE
NNE

2 / 4 mph 15 / 12°F 90% 1017 mb
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNW
NNW

2 / 4 mph 13 / 10°F 90% 1016 mb
Low level cloud: 54%
Mid level cloud: 6%
High level cloud: 20%
Most Significant Cloud Type: low
58%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 22
Aug
00:00

N
N

3 / 6 mph 12 / 6°F 89% 1016 mb
Low level cloud: 46%
Mid level cloud: 5%
High level cloud: 54%
Most Significant Cloud Type: low
54%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

N
N

3 / 6 mph 9 / 4°F 89% 1016 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

N
N

2 / 3 mph 7 / 7°F 92% 1016 mb
Low level cloud: 70%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNE
NNE

2 / 5 mph 12 / 8°F 93% 1016 mb
Low level cloud: 61%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

N
N

2 / 4 mph 17 / 14°F 91% 1015 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: low
70%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

0 / 0 mph 20 / 20°F 94% 1014 mb
Low level cloud: 70%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
70%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

N
N

3 / 4 mph 17 / 13°F 94% 1013 mb
Low level cloud: 52%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

N
N

4 / 8 mph 14 / 7°F 92% 1012 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 23
Aug
00:00

N
N

3 / 7 mph 7 / 0°F 89% 1011 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

N
N

4 / 9 mph 6 / -3°F 86% 1010 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

N
N

5 / 10 mph 5 / -4°F 84% 1009 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
09:00

NNE
NNE

4 / 9 mph 5 / -4°F 85% 1008 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
12:00

NNE
NNE

6 / 13 mph 6 / -5°F 82% 1008 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
15:00

NNE
NNE

7 / 14 mph 11 / 1°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNE
NNE

9 / 14 mph 21 / 11°F 84% 1007 mb
Low level cloud: 12%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: low
35%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNE
NNE

8 / 13 mph 23 / 14°F 83% 1007 mb
Low level cloud: 19%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 24
Aug
00:00

NNE
NNE

7 / 16 mph 20 / 11°F 81% 1007 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 95%
Most Significant Cloud Type: medium
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NNE
NNE

6 / 13 mph 18 / 10°F 80% 1006 mb
Low level cloud: 3%
Mid level cloud: 19%
High level cloud: 87%
Most Significant Cloud Type: medium
30%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

5 / 11 mph 17 / 9°F 82% 1005 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNE
NNE

5 / 11 mph 21 / 14°F 83% 1004 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 79%
Most Significant Cloud Type: medium
30%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NNE
NNE

6 / 10 mph 25 / 18°F 83% 1003 mb
Low level cloud: 0%
Mid level cloud: 90%
High level cloud: 69%
Most Significant Cloud Type: medium
92%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNE
NNE

6 / 9 mph 28 / 21°F 85% 1002 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NNE
NNE

7 / 14 mph 25 / 18°F 84% 1000 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNE
NNE

7 / 15 mph 22 / 13°F 80% 999 mb
Low level cloud: 0%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 25
Aug
00:00

NNE
NNE

8 / 17 mph 22 / 13°F 82% 996 mb
Low level cloud: 0%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NNE
NNE

7 / 16 mph 20 / 11°F 82% 993 mb
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NE
NE

9 / 19 mph 19 / 9°F 76% 991 mb
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNE
NNE

9 / 17 mph 23 / 13°F 79% 989 mb
Low level cloud: 4%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NE
NE

9 / 12 mph 26 / 17°F 84% 987 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
57%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
15:00

NNE
NNE

14 / 17 mph 28 / 17°F 88% 988 mb
Low level cloud: 17%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: low
28%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
18:00

NNE
NNE

13 / 25 mph 26 / 15°F 83% 988 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

N
N

12 / 25 mph 24 / 12°F 88% 989 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 45%
Most Significant Cloud Type: medium
54%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 26
Aug
00:00

NNE
NNE

7 / 15 mph 22 / 13°F 86% 989 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NE
NE

5 / 10 mph 22 / 16°F 91% 987 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 61%
Most Significant Cloud Type: low
95%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NNE
NNE

8 / 16 mph 23 / 14°F 91% 984 mb
Low level cloud: 30%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
09:00

NNE
NNE

10 / 17 mph 27 / 18°F 94% 982 mb
Low level cloud: 44%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
87%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
12:00

NNE
NNE

12 / 22 mph 26 / 16°F 93% 982 mb
Low level cloud: 27%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
54%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
15:00

NNE
NNE

8 / 13 mph 28 / 20°F 94% 981 mb
Low level cloud: 41%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
18:00

ESE
ESE

1 / 3 mph 28 / 28°F 89% 977 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

E
E

5 / 10 mph 25 / 19°F 85% 975 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
95%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 27
Aug
00:00

N
N

4 / 6 mph 9 / 2°F 86% 986 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 75%
Most Significant Cloud Type: medium
50%
0.00 In
06:00

N
N

1 / 3 mph 5 / 5°F 75% 986 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 7%
Most Significant Cloud Type: medium
32%
0.00 In
12:00

NE
NE

7 / 10 mph 9 / -2°F 68% 987 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.00 In
18:00

NE
NE

7 / 13 mph 23 / 15°F 71% 981 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
0.00 In
Wed 28
Aug
00:00

NE
NE

5 / 9 mph 14 / 7°F 67% 983 mb
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 74%
Most Significant Cloud Type: medium
99%
0.00 In
06:00

NE
NE

4 / 9 mph 11 / 3°F 67% 995 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 63%
Most Significant Cloud Type: medium
64%
0.00 In
12:00

NNE
NNE

5 / 11 mph 9 / 0°F 66% 977 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
0.00 In
18:00

SSE
SSE

1 / 2 mph 6 / 6°F 74% 994 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
0.00 In
Thu 29
Aug
00:00

SSW
SSW

3 / 4 mph 15 / 10°F 95% 984 mb
Low level cloud: 66%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.02 In
06:00

SW
SW

1 / 2 mph -5 / -5°F 76% 995 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: medium
9%
0.00 In
12:00

SSW
SSW

2 / 4 mph -10 / -10°F 99% 991 mb
Low level cloud: 94%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: low
96%
0.01 In
18:00

NE
NE

1 / 2 mph 8 / 8°F 77% 994 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
Fri 30
Aug
00:00

NNE
NNE

3 / 6 mph -7 / -14°F 82% 995 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.00 In
06:00

NW
NW

0 / 1 mph -2 / -2°F 61% 995 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.00 In
12:00

NNE
NNE

3 / 7 mph -1 / -9°F 78% 995 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.00 In
18:00

S
S

2 / 2 mph 8 / 8°F 76% 996 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.00 In
Sat 31
Aug
00:00

NE
NE

4 / 9 mph 9 / 1°F 74% 996 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 5%
Most Significant Cloud Type: medium
35%
0.00 In
06:00

SSW
SSW

2 / 4 mph -3 / -8°F 97% 999 mb
Low level cloud: 76%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.01 In
12:00

SSE
SSE

1 / 1 mph -1 / -1°F 83% 1001 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.00 In
18:00

SE
SE

0 / 1 mph 5 / 5°F 92% 1005 mb
Low level cloud: 11%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
15%
0.00 In
Sun 01
Sep
00:00

WSW
WSW

2 / 3 mph -6 / -6°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.00 In
06:00

NNW
NNW

1 / 2 mph 5 / 5°F 72% 1006 mb
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 15%
Most Significant Cloud Type: medium
28%
0.00 In
12:00

SSE
SSE

1 / 2 mph 0 / 0°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

NW
NW

7 / 9 mph 22 / 14°F 84% 1002 mb
Low level cloud: 63%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.10 In
Mon 02
Sep
00:00

N
N

1 / 2 mph -10 / -10°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 22%
Most Significant Cloud Type: medium
14%
0.00 In
06:00

NW
NW

4 / 9 mph 7 / -1°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: medium
7%
0.00 In
12:00

ESE
ESE

1 / 2 mph 13 / 13°F 93% 1018 mb
Low level cloud: 31%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.00 In
18:00

N
N

18 / 23 mph 26 / 12°F 83% 1013 mb
Low level cloud: 70%
Mid level cloud: 44%
High level cloud: 48%
Most Significant Cloud Type: low
90%
0.06 In
Tue 03
Sep
00:00

N
N

13 / 15 mph 29 / 19°F 89% 1011 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: low
70%
0.05 In
06:00

N
N

13 / 15 mph 38 / 30°F 94% 1006 mb
Low level cloud: 66%
Mid level cloud: 53%
High level cloud: 99%
Most Significant Cloud Type: low
96%
0.10 In
12:00

N
N

15 / 18 mph 37 / 28°F 91% 997 mb
Low level cloud: 46%
Mid level cloud: 45%
High level cloud: 36%
Most Significant Cloud Type: low
65%
0.09 In
18:00

NNW
NNW

16 / 18 mph 40 / 31°F 96% 1000 mb
Low level cloud: 82%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.47 In
Wed 04
Sep
00:00

WNW
WNW

13 / 27 mph 20 / 7°F 82% 987 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.24 In
06:00

NW
NW

9 / 19 mph 19 / 8°F 84% 997 mb
Low level cloud: 67%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.08 In
12:00

ENE
ENE

2 / 5 mph -7 / -12°F 73% 1004 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.00 In
18:00

S
S

4 / 8 mph 5 / -3°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
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