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Silka 14 Day Long Range Forecast

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

Russia

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

Taking a look at Silka over the coming two weeks and the average daytime maximum temperature will be around -5°C, with a high for the two weeks of 1°C expected on the afternoon of Thursday 12th. The average minimum temperature will be -20°C, dipping to its lowest on the morning of Saturday 14th at -27°C. Expect the coming 14 days to remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 11
Mar
16:00

SSW
SSW

9 / 10 mph 26 / 17°F 82% 1023 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

6 / 11 mph 25 / 17°F 85% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

4 / 9 mph 12 / 5°F 89% 1021 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Mar
01:00

SW
SW

4 / 9 mph 14 / 7°F 88% 1019 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

4 / 8 mph 18 / 12°F 87% 1017 mb
Low level cloud: 2%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

3 / 7 mph 10 / 4°F 94% 1020 mb
Low level cloud: 37%
Mid level cloud: 11%
High level cloud: 67%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

5 / 10 mph 17 / 9°F 93% 1021 mb
Low level cloud: 31%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

9 / 11 mph 29 / 21°F 87% 1021 mb
Low level cloud: 46%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

9 / 11 mph 34 / 26°F 88% 1019 mb
Low level cloud: 34%
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
19:00

W
W

13 / 16 mph 27 / 16°F 81% 1021 mb
Low level cloud: 10%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

12 / 17 mph 21 / 9°F 83% 1023 mb
Low level cloud: 9%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Mar
01:00

W
W

13 / 19 mph 18 / 5°F 80% 1025 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

9 / 18 mph 7 / -7°F 81% 1028 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

5 / 11 mph -10 / -23°F 91% 1033 mb
Low level cloud: 15%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

5 / 11 mph -4 / -15°F 83% 1034 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

9 / 10 mph 13 / 1°F 66% 1032 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

11 / 12 mph 18 / 6°F 62% 1031 mb
Low level cloud: 19%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

6 / 10 mph 14 / 5°F 69% 1032 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

3 / 7 mph -7 / -16°F 88% 1037 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Mar
01:00

SW
SW

3 / 7 mph -11 / -20°F 91% 1038 mb
Low level cloud: 6%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

4 / 9 mph -14 / -25°F 94% 1038 mb
Low level cloud: 25%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

4 / 9 mph -16 / -28°F 97% 1038 mb
Low level cloud: 55%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

4 / 8 mph -7 / -17°F 93% 1037 mb
Low level cloud: 34%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

6 / 7 mph 11 / 2°F 77% 1032 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

9 / 10 mph 17 / 6°F 75% 1029 mb
Low level cloud: 0%
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
19:00

SSW
SSW

7 / 9 mph 16 / 6°F 84% 1027 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

6 / 12 mph 6 / -4°F 93% 1028 mb
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 15
Mar
01:00

SSW
SSW

7 / 15 mph 9 / -3°F 95% 1027 mb
Low level cloud: 58%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

8 / 16 mph -1 / -15°F 97% 1028 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

7 / 15 mph 1 / -12°F 82% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

8 / 16 mph 6 / -7°F 74% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 20%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

11 / 12 mph 19 / 7°F 59% 1028 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

8 / 10 mph 25 / 15°F 58% 1026 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 8%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

3 / 5 mph 24 / 20°F 77% 1023 mb
Low level cloud: 22%
Mid level cloud: 90%
High level cloud: 7%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

4 / 8 mph 6 / -1°F 92% 1025 mb
Low level cloud: 23%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 16
Mar
01:00

SE
SE

2 / 4 mph 1 / -4°F 97% 1023 mb
Low level cloud: 54%
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
04:00

ESE
ESE

1 / 2 mph 3 / 3°F 97% 1020 mb
Low level cloud: 64%
Mid level cloud: 100%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

2 / 4 mph -2 / -7°F 99% 1019 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

5 / 9 mph 8 / -1°F 93% 1017 mb
Low level cloud: 42%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

10 / 11 mph 19 / 8°F 85% 1014 mb
Low level cloud: 29%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

19 / 22 mph 28 / 14°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 65%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

14 / 20 mph 19 / 5°F 64% 1014 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

15 / 27 mph 9 / -9°F 61% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 17
Mar
01:00

W
W

14 / 24 mph 4 / -14°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

11 / 21 mph 0 / -17°F 79% 1020 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

10 / 22 mph -4 / -22°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

10 / 15 mph 0 / -16°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

15 / 18 mph 10 / -7°F 53% 1020 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

15 / 17 mph 12 / -4°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

11 / 13 mph 11 / -3°F 72% 1021 mb
Low level cloud: 47%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

4 / 10 mph -5 / -16°F 90% 1024 mb
Low level cloud: 21%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 18
Mar
04:00

SW
SW

4 / 10 mph -10 / -22°F 96% 1023 mb
Low level cloud: 48%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: low
55%
0.0 In
10:00

NW
NW

4 / 8 mph 2 / -6°F 78% 1027 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
16:00

SSW
SSW

9 / 10 mph 18 / 7°F 78% 1020 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: low
7%
0.0 In
22:00

SSW
SSW

4 / 10 mph 2 / -8°F 92% 1028 mb
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
26%
0.0 In
Thu 19
Mar
04:00

SSW
SSW

4 / 9 mph -3 / -13°F 94% 1032 mb
Low level cloud: 29%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
10:00

SSW
SSW

6 / 12 mph 13 / 5°F 89% 1014 mb
Low level cloud: 12%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
16:00

SSW
SSW

4 / 5 mph 24 / 18°F 69% 1029 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
22:00

SSW
SSW

4 / 8 mph 3 / -5°F 95% 1030 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
45%
0.0 In
Fri 20
Mar
04:00

SSW
SSW

3 / 7 mph -8 / -16°F 99% 1032 mb
Low level cloud: 80%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
81%
0.0 In
10:00

SW
SW

3 / 6 mph 6 / 0°F 97% 1029 mb
Low level cloud: 94%
Mid level cloud: 5%
High level cloud: 18%
Most Significant Cloud Type: low
97%
0.0 In
16:00

SSW
SSW

6 / 7 mph 24 / 17°F 77% 1024 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
22:00

SSW
SSW

3 / 6 mph 9 / 4°F 97% 1027 mb
Low level cloud: 56%
Mid level cloud: 48%
High level cloud: 12%
Most Significant Cloud Type: low
74%
0.0 In
Sat 21
Mar
04:00

SSW
SSW

3 / 6 mph 3 / -4°F 97% 1025 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
10:00

SW
SW

2 / 5 mph 13 / 9°F 97% 1029 mb
Low level cloud: 82%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
83%
0.0 In
16:00

SSW
SSW

7 / 8 mph 30 / 23°F 85% 1019 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 26%
Most Significant Cloud Type: low
47%
0.0 In
22:00

SSW
SSW

5 / 11 mph 14 / 6°F 96% 1023 mb
Low level cloud: 55%
Mid level cloud: 6%
High level cloud: 42%
Most Significant Cloud Type: low
62%
0.0 In
Sun 22
Mar
04:00

SSW
SSW

4 / 8 mph 5 / -3°F 99% 1018 mb
Low level cloud: 89%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
10:00

SW
SW

5 / 10 mph 14 / 7°F 93% 1019 mb
Low level cloud: 38%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
16:00

SSW
SSW

10 / 11 mph 29 / 20°F 80% 1005 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
22:00

SSW
SSW

5 / 11 mph 21 / 14°F 96% 1014 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 96%
Most Significant Cloud Type: low
73%
0.0 In
Mon 23
Mar
04:00

SE
SE

1 / 2 mph 9 / 9°F 99% 1004 mb
Low level cloud: 79%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.0 In
10:00

SSW
SSW

4 / 7 mph 21 / 16°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
16:00

NE
NE

10 / 11 mph 28 / 19°F 93% 1002 mb
Low level cloud: 77%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
22:00

S
S

2 / 5 mph 25 / 23°F 90% 1009 mb
Low level cloud: 14%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Tue 24
Mar
04:00

NNE
NNE

27 / 35 mph 21 / 4°F 93% 1004 mb
Low level cloud: 74%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
10:00

ENE
ENE

1 / 2 mph 25 / 25°F 86% 1005 mb
Low level cloud: 4%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
0.0 In
16:00

NNE
NNE

19 / 22 mph 22 / 7°F 94% 1010 mb
Low level cloud: 70%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.8 In
22:00

SW
SW

4 / 8 mph 26 / 21°F 92% 1001 mb
Low level cloud: 25%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Wed 25
Mar
04:00

NNE
NNE

15 / 20 mph 20 / 6°F 94% 1016 mb
Low level cloud: 79%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
10:00

NW
NW

17 / 20 mph 22 / 9°F 56% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
16:00

N
N

12 / 14 mph 30 / 20°F 92% 1016 mb
Low level cloud: 73%
Mid level cloud: 57%
High level cloud: 34%
Most Significant Cloud Type: low
97%
0.1 In
22:00

WNW
WNW

14 / 23 mph 19 / 6°F 48% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Thu 26
Mar
04:00

N
N

3 / 6 mph 5 / -1°F 97% 1020 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
87%
0.0 In
10:00

WNW
WNW

9 / 12 mph 15 / 2°F 56% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
16:00

WNW
WNW

2 / 2 mph 30 / 30°F 91% 1016 mb
Low level cloud: 73%
Mid level cloud: 15%
High level cloud: 6%
Most Significant Cloud Type: low
78%
0.0 In
22:00

W
W

8 / 15 mph 17 / 7°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 48%
Most Significant Cloud Type: medium
100%
0.0 In

Other Locations Near to Silka

Cities and Towns: Nercinsk, Russia

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