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Chistopol' 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Chistopol'

Russia

Long range weather outlook for Chistopol' includes 14 day forecast summary:

Over the next 14 days the Chistopol' forecast suggests the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 24°C expected on the afternoon of Sunday 26th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 23rd at 3°C. Expect the following 14 days ahead to have mixed weather with some days dry and some seeing a little rain. It looks like Tuesday 21st will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 19
May		19:00

ENE
ENE

 5 / 8 mph 57 / 55°F 58% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 5 mph 51 / 51°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

NNE
NNE

 2 / 4 mph 48 / 48°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 2 / 3 mph 46 / 46°F 71% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 15%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 2 / 2 mph 50 / 49°F 65% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 4 / 4 mph 58 / 56°F 53% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 5 / 7 mph 62 / 60°F 47% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 6 / 9 mph 63 / 61°F 47% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 5 / 7 mph 63 / 61°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 8 / 16 mph 53 / 51°F 67% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

WSW
WSW

 7 / 15 mph 50 / 47°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 7 / 15 mph 49 / 45°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 8 / 12 mph 54 / 51°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 11 / 13 mph 63 / 61°F 63% 1018 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 19%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 11 / 15 mph 65 / 63°F 62% 1018 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 12 / 16 mph 65 / 64°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 20%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 6 / 9 mph 64 / 61°F 78% 1018 mb
Low level cloud: 19%
Mid level cloud: 51%
High level cloud: 46%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 6 / 11 mph 54 / 52°F 76% 1019 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

NE
NE

 5 / 11 mph 50 / 48°F 74% 1019 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 4 / 8 mph 50 / 49°F 74% 1019 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 50%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 1 / 2 mph 53 / 53°F 71% 1019 mb
Low level cloud: 72%
Mid level cloud: 67%
High level cloud: 39%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 1 / 2 mph 54 / 54°F 78% 1018 mb
Low level cloud: 72%
Mid level cloud: 59%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 4 / 6 mph 57 / 55°F 74% 1018 mb
Low level cloud: 31%
Mid level cloud: 40%
High level cloud: 33%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 7 / 9 mph 63 / 60°F 62% 1018 mb
Low level cloud: 28%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 11 / 16 mph 53 / 48°F 69% 1020 mb
Low level cloud: 60%
Mid level cloud: 81%
High level cloud: 1%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 11 / 19 mph 47 / 42°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 3%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

NNE
NNE

 10 / 19 mph 42 / 36°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 9 / 17 mph 38 / 32°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 11 / 14 mph 42 / 35°F 57% 1027 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 12 / 14 mph 47 / 41°F 42% 1028 mb
Low level cloud: 0%
Mid level cloud: 16%
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

N
N

 12 / 14 mph 50 / 44°F 38% 1028 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 12 / 14 mph 51 / 46°F 38% 1027 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 8 / 11 mph 50 / 46°F 51% 1027 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 5 / 10 mph 43 / 40°F 60% 1028 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 30%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		01:00

WNW
WNW

 5 / 11 mph 41 / 38°F 64% 1028 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 20%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 7 / 14 mph 39 / 35°F 67% 1028 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
07:00

WNW
WNW

 9 / 13 mph 44 / 39°F 63% 1027 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
10:00

NW
NW

 11 / 14 mph 50 / 45°F 51% 1027 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 16 / 20 mph 50 / 44°F 68% 1026 mb
Low level cloud: 76%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 13 / 18 mph 50 / 45°F 71% 1026 mb
Low level cloud: 53%
Mid level cloud: 65%
High level cloud: 19%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 8 / 11 mph 49 / 45°F 73% 1026 mb
Low level cloud: 45%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 5 / 9 mph 46 / 43°F 80% 1028 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May		01:00

NNE
NNE

 5 / 9 mph 43 / 40°F 82% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 40 / 38°F 81% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 2 / 3 mph 46 / 45°F 69% 1031 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 6 / 7 mph 53 / 50°F 61% 1031 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 8 / 9 mph 59 / 56°F 51% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 11 / 13 mph 62 / 60°F 52% 1029 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 9 / 15 mph 61 / 59°F 71% 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
22:00

WSW
WSW

 10 / 21 mph 54 / 51°F 85% 1028 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 17%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 26
May		04:00

NNW
NNW

 7 / 14 mph 44 / 40°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
10:00

W
W

 11 / 19 mph 55 / 52°F 57% 1026 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: medium
54%
0.0 In
16:00

W
W

 15 / 30 mph 69 / 69°F 58% 1012 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: medium
25%
0.0 In
22:00

N
N

 6 / 12 mph 52 / 49°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Mon 27
May		04:00

ENE
ENE

 6 / 10 mph 52 / 50°F 95% 1022 mb
Low level cloud: 46%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
10:00

NNE
NNE

 10 / 18 mph 53 / 50°F 50% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: medium
1%
0.0 In
16:00

W
W

 11 / 19 mph 73 / 76°F 49% 1023 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 18%
Most Significant Cloud Type: medium
23%
0.0 In
22:00

NNW
NNW

 4 / 8 mph 61 / 61°F 79% 1023 mb
Low level cloud: 9%
Mid level cloud: 26%
High level cloud: 15%
Most Significant Cloud Type: low
20%
0.0 In
Tue 28
May		04:00

WNW
WNW

 5 / 10 mph 58 / 58°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 5%
Most Significant Cloud Type: medium
43%
0.0 In
10:00

N
N

 9 / 15 mph 60 / 60°F 48% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

ENE
ENE

 11 / 18 mph 68 / 68°F 59% 1024 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
23%
0.0 In
22:00

N
N

 7 / 16 mph 52 / 49°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Wed 29
May		04:00

ESE
ESE

 7 / 15 mph 50 / 47°F 68% 1026 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
10:00

N
N

 6 / 10 mph 59 / 58°F 48% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

SSE
SSE

 6 / 10 mph 69 / 69°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
22:00

NNE
NNE

 8 / 16 mph 53 / 50°F 71% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Thu 30
May		04:00

SSW
SSW

 4 / 9 mph 58 / 58°F 93% 1022 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
21%
0.1 In
10:00

N
N

 3 / 5 mph 63 / 63°F 49% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

W
W

 3 / 6 mph 75 / 78°F 55% 1021 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: medium
18%
0.0 In
22:00

WSW
WSW

 7 / 14 mph 57 / 56°F 63% 1025 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Fri 31
May		04:00

WSW
WSW

 5 / 11 mph 59 / 58°F 91% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
10:00

WNW
WNW

 9 / 14 mph 65 / 65°F 62% 1024 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 10%
Most Significant Cloud Type: medium
25%
0.0 In
16:00

SW
SW

 6 / 12 mph 73 / 76°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: medium
32%
0.1 In
22:00

N
N

 4 / 8 mph 62 / 62°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: medium
19%
0.1 In
Sat 01
Jun		04:00

NNE
NNE

 13 / 28 mph 49 / 43°F 89% 1021 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.2 In
10:00

E
E

 5 / 9 mph 67 / 67°F 62% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
16:00

N
N

 13 / 27 mph 60 / 60°F 45% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
0.0 In
22:00

ESE
ESE

 3 / 6 mph 66 / 66°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 02
Jun		04:00

NNW
NNW

 7 / 15 mph 47 / 43°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: medium
13%
0.0 In
10:00

SW
SW

 7 / 13 mph 70 / 70°F 65% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: medium
15%
0.0 In
16:00

NW
NW

 13 / 27 mph 67 / 67°F 50% 1023 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
22:00

W
W

 3 / 6 mph 69 / 69°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: medium
15%
0.0 In
Mon 03
Jun		04:00

W
W

 9 / 19 mph 53 / 50°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 5%
Most Significant Cloud Type: medium
11%
0.0 In
10:00

SW
SW

 8 / 15 mph 70 / 71°F 68% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: medium
23%
0.0 In
16:00

W
W

 16 / 34 mph 71 / 71°F 58% 1014 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 9%
Most Significant Cloud Type: medium
26%
0.0 In
22:00

SSW
SSW

 4 / 9 mph 66 / 66°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.1 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