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Syowa 14 Day Long Range Forecast

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

Antarctica

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

Taking a look at Syowa over the coming two weeks and the average daytime maximum temperature will be around -8°C, with a high for the two weeks of 1°C expected on the afternoon of Tuesday 31st. The mean minimum temperature will be -14°C, dipping to its lowest on the morning of Sunday 29th at -21°C. The next 14 days will have mostly dry days although Thursday 26th and Friday 27th are likely to see a little snow. Predictions are Friday 27th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the afternoon of Thursday 26th, coming from a north easterly direction, and reaching around 46mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 21
Mar		18:00

E
E

 9 / 18 mph 14 / 2°F 79% 986 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 56%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 8 / 17 mph 12 / 1°F 76% 985 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Mar		00:00

ESE
ESE

 7 / 15 mph 5 / -8°F 73% 983 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 40%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 6 / 13 mph 6 / -5°F 74% 981 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 4 / 9 mph 3 / -6°F 72% 980 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 3 / 7 mph 8 / 1°F 70% 978 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 30%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 3 / 7 mph 7 / 1°F 79% 977 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 22%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 4 / 10 mph 5 / -4°F 80% 976 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 46%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 5 / 11 mph 1 / -9°F 77% 975 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 5 / 10 mph 0 / -10°F 79% 975 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 83%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 23
Mar		00:00

SSE
SSE

 4 / 9 mph 0 / -10°F 81% 975 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 69%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 4 / 8 mph -1 / -10°F 83% 976 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 3 / 6 mph 2 / -3°F 80% 977 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 1 / 2 mph -1 / -1°F 71% 979 mb
Low level cloud: 0%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 1 / 3 mph -1 / -1°F 79% 980 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 4 / 9 mph -2 / -12°F 85% 981 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 17%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 6 / 13 mph -2 / -15°F 90% 982 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 9 / 18 mph -1 / -16°F 86% 983 mb
Low level cloud: 61%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 24
Mar		00:00

E
E

 9 / 18 mph 11 / -1°F 80% 984 mb
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 8 / 16 mph 12 / 0°F 76% 984 mb
Low level cloud: 57%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 6 / 12 mph 13 / 4°F 73% 984 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 3 / 6 mph 10 / 5°F 65% 985 mb
Low level cloud: 5%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 2 / 3 mph 10 / 10°F 72% 985 mb
Low level cloud: 15%
Mid level cloud: 53%
High level cloud: 93%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 6 / 14 mph 11 / 1°F 82% 985 mb
Low level cloud: 31%
Mid level cloud: 63%
High level cloud: 46%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 6 / 12 mph 11 / 1°F 83% 985 mb
Low level cloud: 70%
Mid level cloud: 54%
High level cloud: 35%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 5 / 11 mph 9 / -1°F 81% 986 mb
Low level cloud: 74%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 25
Mar		00:00

E
E

 6 / 10 mph 18 / 10°F 85% 986 mb
Low level cloud: 76%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 15 / 31 mph 15 / 0°F 82% 987 mb
Low level cloud: 43%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 26 / 53 mph 16 / -3°F 79% 988 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 30 / 62 mph 16 / -4°F 84% 989 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 28 / 59 mph 16 / -3°F 81% 989 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 44%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 22 / 46 mph 16 / -2°F 82% 988 mb
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 11 / 23 mph 15 / 2°F 80% 987 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 87%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 15 / 31 mph 16 / 1°F 84% 985 mb
Low level cloud: 32%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 26
Mar		00:00

ENE
ENE

 27 / 31 mph 27 / 12°F 79% 981 mb
Low level cloud: 8%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 34 / 39 mph 28 / 11°F 80% 978 mb
Low level cloud: 19%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 38 / 81 mph 20 / -1°F 62% 973 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 42 / 88 mph 19 / -3°F 65% 968 mb
Low level cloud: 4%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 47 / 100 mph 19 / -4°F 71% 961 mb
Low level cloud: 11%
Mid level cloud: 35%
High level cloud: 7%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 30 / 64 mph 19 / 0°F 85% 961 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 32 / 68 mph 19 / -1°F 80% 960 mb
Low level cloud: 2%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 37 / 78 mph 19 / -2°F 80% 961 mb
Low level cloud: 7%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 27
Mar		00:00

ENE
ENE

 34 / 71 mph 4 / -21°F 82% 961 mb
Low level cloud: 24%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 30 / 63 mph 5 / -19°F 87% 962 mb
Low level cloud: 44%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 26 / 54 mph 4 / -19°F 88% 963 mb
Low level cloud: 49%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 30 / 64 mph 4 / -20°F 86% 965 mb
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 31 / 65 mph 5 / -20°F 83% 966 mb
Low level cloud: 37%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 27 / 57 mph 8 / -14°F 78% 968 mb
Low level cloud: 15%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 24 / 51 mph 11 / -9°F 77% 970 mb
Low level cloud: 14%
Mid level cloud: 100%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 17 / 20 mph 29 / 17°F 70% 972 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 3%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 28
Mar		00:00

ESE
ESE

 6 / 13 mph 12 / 2°F 74% 994 mb
Low level cloud: 68%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

E
E

 7 / 15 mph 0 / -13°F 77% 985 mb
Low level cloud: 58%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: low
94%
0.0 In
12:00

NE
NE

 26 / 30 mph 22 / 5°F 87% 968 mb
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
18:00

ESE
ESE

 7 / 15 mph -6 / -20°F 70% 970 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 29
Mar		00:00

ESE
ESE

 6 / 13 mph -5 / -18°F 73% 976 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
06:00

NE
NE

 19 / 39 mph 16 / -1°F 66% 987 mb
Low level cloud: 7%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SE
SE

 5 / 8 mph 21 / 14°F 71% 974 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 8%
Most Significant Cloud Type: medium
26%
0.0 In
18:00

SE
SE

 6 / 13 mph 1 / -10°F 86% 995 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 30
Mar		00:00

SE
SE

 7 / 16 mph 0 / -14°F 86% 992 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

SSE
SSE

 10 / 21 mph 2 / -13°F 70% 990 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

ENE
ENE

 12 / 18 mph 19 / 6°F 83% 999 mb
Low level cloud: 16%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: low
21%
0.0 In
18:00

E
E

 11 / 16 mph 24 / 13°F 62% 984 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
0.0 In
Tue 31
Mar		00:00

SE
SE

 7 / 15 mph 17 / 7°F 68% 1000 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

E
E

 8 / 17 mph 14 / 3°F 64% 989 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

ENE
ENE

 30 / 48 mph 33 / 19°F 45% 998 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

ENE
ENE

 12 / 25 mph 22 / 11°F 61% 998 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
0.0 In
Wed 01
Apr		00:00

NE
NE

 31 / 42 mph 32 / 18°F 56% 1002 mb
Low level cloud: 30%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ESE
ESE

 7 / 15 mph 13 / 2°F 63% 1007 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
0.0 In
12:00

NE
NE

 29 / 38 mph 29 / 14°F 67% 1010 mb
Low level cloud: 60%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
76%
0.0 In
18:00

ENE
ENE

 6 / 8 mph 21 / 14°F 73% 1002 mb
Low level cloud: 25%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 02
Apr		00:00

ESE
ESE

 6 / 12 mph 21 / 13°F 71% 1009 mb
Low level cloud: 51%
Mid level cloud: 57%
High level cloud: 9%
Most Significant Cloud Type: low
72%
0.0 In
06:00

E
E

 4 / 6 mph 20 / 14°F 84% 1001 mb
Low level cloud: 79%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSE
SSE

 4 / 8 mph 16 / 10°F 73% 998 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
18:00

ESE
ESE

 6 / 13 mph 7 / -4°F 79% 1002 mb
Low level cloud: 73%
Mid level cloud: 33%
High level cloud: 11%
Most Significant Cloud Type: low
85%
0.0 In
Fri 03
Apr		00:00

ESE
ESE

 7 / 14 mph 2 / -11°F 65% 993 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

SE
SE

 5 / 10 mph 1 / -9°F 76% 1001 mb
Low level cloud: 20%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
30%
0.0 In
12:00

ESE
ESE

 7 / 12 mph 11 / 0°F 65% 998 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: medium
96%
0.0 In
18:00

SE
SE

 4 / 9 mph 5 / -4°F 73% 1001 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 04
Apr		00:00

E
E

 11 / 17 mph 15 / 2°F 61% 1001 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

E
E

 4 / 9 mph 9 / 2°F 71% 1004 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

S
S

 3 / 4 mph 27 / 23°F 81% 999 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
88%
0.0 In
18:00

ENE
ENE

 4 / 5 mph 19 / 14°F 78% 1005 mb
Low level cloud: 72%
Mid level cloud: 100%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
Sun 05
Apr		00:00

ESE
ESE

 7 / 15 mph 9 / -2°F 66% 994 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 82%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ENE
ENE

 9 / 18 mph 15 / 4°F 89% 1005 mb
Low level cloud: 61%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
12:00

SE
SE

 4 / 7 mph 9 / 3°F 75% 993 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 58%
Most Significant Cloud Type: medium
44%
0.0 In
18:00

NE
NE

 17 / 21 mph 23 / 10°F 86% 1004 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 7%
Most Significant Cloud Type: low
88%
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