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Clearlake 14 Day Long Range Forecast

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

California, United States Of America

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

For Clearlake in the coming two weeks the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 21°C expected on the afternoon of Tuesday 16th. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 18th at 5°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Wednesday 24th will have the most precipitation with an accumulation of around 52.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 14
Dec		01:00

NE
NE

 2 / 4 mph 41 / 40°F 61% 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
04:00

NE
NE

 2 / 5 mph 41 / 40°F 63% 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
07:00

NNE
NNE

 3 / 6 mph 38 / 37°F 66% 1021 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
10:00

ENE
ENE

 3 / 3 mph 59 / 60°F 44% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 3 / 3 mph 65 / 64°F 37% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 2 / 4 mph 57 / 56°F 50% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 2 / 4 mph 46 / 46°F 61% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 2 / 4 mph 44 / 44°F 61% 1023 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 15%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec		19:00

WNW
WNW

 4 / 8 mph 50 / 49°F 74% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 4 / 9 mph 49 / 47°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 70%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Dec		01:00

NW
NW

 4 / 8 mph 49 / 48°F 92% 1022 mb
Low level cloud: 6%
Mid level cloud: 11%
High level cloud: 61%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 3 / 6 mph 51 / 51°F 94% 1023 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 94%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 2 / 5 mph 52 / 52°F 94% 1022 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 56%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 2 / 2 mph 66 / 65°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 5 mph 70 / 69°F 60% 1019 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 4 / 6 mph 59 / 59°F 87% 1019 mb
Low level cloud: 22%
Mid level cloud: 97%
High level cloud: 15%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 2 / 3 mph 58 / 59°F 97% 1019 mb
Low level cloud: 84%
Mid level cloud: 95%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SW
SW

 4 / 6 mph 57 / 57°F 99% 1019 mb
Low level cloud: 97%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 17
Dec		01:00

WSW
WSW

 6 / 9 mph 58 / 57°F 95% 1019 mb
Low level cloud: 78%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 6 / 8 mph 57 / 56°F 93% 1019 mb
Low level cloud: 75%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 6 / 7 mph 56 / 55°F 92% 1021 mb
Low level cloud: 79%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 7 / 8 mph 59 / 57°F 80% 1023 mb
Low level cloud: 55%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 9 / 10 mph 60 / 59°F 70% 1021 mb
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 5 / 6 mph 58 / 57°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 4 / 7 mph 46 / 45°F 89% 1022 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 4 / 7 mph 43 / 42°F 90% 1022 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		01:00

WNW
WNW

 4 / 7 mph 42 / 40°F 81% 1021 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
04:00

W
W

 4 / 9 mph 41 / 39°F 69% 1021 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 4 / 8 mph 46 / 44°F 59% 1021 mb
Low level cloud: 63%
Mid level cloud: 27%
High level cloud: 29%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 3 / 4 mph 56 / 55°F 62% 1022 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 4 mph 61 / 60°F 69% 1020 mb
Low level cloud: 57%
Mid level cloud: 9%
High level cloud: 31%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 3 / 4 mph 57 / 57°F 80% 1019 mb
Low level cloud: 77%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 4 / 7 mph 52 / 51°F 90% 1019 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 4 / 8 mph 46 / 44°F 96% 1020 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 91%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		01:00

WSW
WSW

 4 / 9 mph 45 / 43°F 98% 1019 mb
Low level cloud: 74%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 4 / 6 mph 48 / 47°F 95% 1018 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 4 / 6 mph 50 / 49°F 94% 1018 mb
Low level cloud: 89%
Mid level cloud: 9%
High level cloud: 40%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 7 mph 55 / 54°F 87% 1018 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 21%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 5 / 6 mph 53 / 51°F 94% 1016 mb
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SW
SW

 4 / 5 mph 53 / 52°F 97% 1015 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSW
SSW

 3 / 4 mph 52 / 52°F 99% 1015 mb
Low level cloud: 97%
Mid level cloud: 52%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SSW
SSW

 3 / 4 mph 52 / 51°F 99% 1016 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		01:00

WSW
WSW

 4 / 5 mph 52 / 52°F 99% 1016 mb
Low level cloud: 87%
Mid level cloud: 22%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 4 / 6 mph 49 / 48°F 98% 1017 mb
Low level cloud: 73%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 3 / 5 mph 49 / 48°F 98% 1018 mb
Low level cloud: 76%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 3 / 3 mph 53 / 53°F 89% 1019 mb
Low level cloud: 26%
Mid level cloud: 24%
High level cloud: 37%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 3 / 3 mph 60 / 60°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 32%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 3 / 4 mph 56 / 55°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 2 / 5 mph 46 / 46°F 88% 1017 mb
Low level cloud: 2%
Mid level cloud: 55%
High level cloud: 21%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 2 / 4 mph 49 / 49°F 86% 1017 mb
Low level cloud: 3%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 21
Dec		04:00

ESE
ESE

 2 / 4 mph 43 / 43°F 96% 1014 mb
Low level cloud: 93%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
10:00

SE
SE

 2 / 4 mph 48 / 48°F 92% 1016 mb
Low level cloud: 97%
Mid level cloud: 95%
High level cloud: 41%
Most Significant Cloud Type: low
100%
0.0 In
16:00

SW
SW

 4 / 6 mph 45 / 43°F 98% 1012 mb
Low level cloud: 89%
Mid level cloud: 71%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
22:00

SW
SW

 5 / 8 mph 45 / 42°F 97% 1011 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
Mon 22
Dec		04:00

SW
SW

 6 / 9 mph 54 / 53°F 98% 1012 mb
Low level cloud: 89%
Mid level cloud: 53%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.0 In
10:00

SSW
SSW

 11 / 19 mph 55 / 52°F 92% 1014 mb
Low level cloud: 89%
Mid level cloud: 27%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.0 In
16:00

WSW
WSW

 10 / 18 mph 55 / 53°F 94% 1011 mb
Low level cloud: 85%
Mid level cloud: 89%
High level cloud: 78%
Most Significant Cloud Type: low
100%
0.0 In
22:00

WSW
WSW

 1 / 2 mph 50 / 50°F 95% 1015 mb
Low level cloud: 47%
Mid level cloud: 72%
High level cloud: 43%
Most Significant Cloud Type: low
77%
0.0 In
Tue 23
Dec		04:00

WNW
WNW

 3 / 5 mph 42 / 41°F 93% 1020 mb
Low level cloud: 17%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.4 In
10:00

ESE
ESE

 4 / 7 mph 52 / 51°F 96% 1013 mb
Low level cloud: 96%
Mid level cloud: 83%
High level cloud: 43%
Most Significant Cloud Type: low
100%
0.0 In
16:00

NE
NE

 3 / 6 mph 48 / 47°F 95% 1018 mb
Low level cloud: 96%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
22:00

SSE
SSE

 13 / 24 mph 51 / 47°F 88% 1006 mb
Low level cloud: 68%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Wed 24
Dec		04:00

ENE
ENE

 4 / 7 mph 43 / 41°F 98% 1016 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
10:00

SSW
SSW

 16 / 31 mph 54 / 50°F 96% 998 mb
Low level cloud: 100%
Mid level cloud: 91%
High level cloud: 97%
Most Significant Cloud Type: low
100%
2.0 In
16:00

ENE
ENE

 4 / 8 mph 50 / 49°F 96% 1014 mb
Low level cloud: 57%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.1 In
22:00

SSW
SSW

 12 / 23 mph 46 / 40°F 90% 1004 mb
Low level cloud: 92%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.6 In
Thu 25
Dec		04:00

E
E

 4 / 8 mph 50 / 49°F 98% 1018 mb
Low level cloud: 93%
Mid level cloud: 84%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.4 In
10:00

SSW
SSW

 9 / 18 mph 47 / 42°F 85% 1009 mb
Low level cloud: 36%
Mid level cloud: 29%
High level cloud: 98%
Most Significant Cloud Type: low
58%
0.2 In
16:00

SE
SE

 6 / 12 mph 54 / 53°F 98% 1020 mb
Low level cloud: 98%
Mid level cloud: 72%
High level cloud: 54%
Most Significant Cloud Type: low
100%
0.3 In
22:00

SSE
SSE

 11 / 23 mph 46 / 40°F 94% 1006 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Fri 26
Dec		04:00

SSE
SSE

 3 / 6 mph 53 / 54°F 98% 1022 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
10:00

W
W

 4 / 8 mph 46 / 45°F 82% 1009 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
0.4 In
16:00

ESE
ESE

 3 / 6 mph 57 / 58°F 95% 1020 mb
Low level cloud: 84%
Mid level cloud: 84%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.1 In
22:00

NW
NW

 4 / 9 mph 35 / 31°F 96% 1018 mb
Low level cloud: 40%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
Sat 27
Dec		04:00

E
E

 3 / 6 mph 53 / 54°F 97% 1019 mb
Low level cloud: 84%
Mid level cloud: 57%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.0 In
10:00

NE
NE

 1 / 3 mph 47 / 47°F 63% 1028 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
16:00

ESE
ESE

 4 / 8 mph 56 / 56°F 98% 1014 mb
Low level cloud: 93%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
22:00

NNW
NNW

 3 / 6 mph 36 / 33°F 87% 1031 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
Sun 28
Dec		04:00

WSW
WSW

 12 / 26 mph 51 / 47°F 94% 1010 mb
Low level cloud: 84%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.2 In
10:00

N
N

 1 / 2 mph 49 / 49°F 60% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
16:00

S
S

 7 / 14 mph 56 / 55°F 79% 1014 mb
Low level cloud: 19%
Mid level cloud: 36%
High level cloud: 83%
Most Significant Cloud Type: low
41%
0.0 In
22:00

NNW
NNW

 2 / 5 mph 37 / 35°F 81% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
0.0 In
Mon 29
Dec		04:00

SSW
SSW

 9 / 20 mph 49 / 45°F 95% 1010 mb
Low level cloud: 100%
Mid level cloud: 57%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
10:00

N
N

 1 / 2 mph 52 / 53°F 54% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

SW
SW

 7 / 14 mph 52 / 49°F 86% 1009 mb
Low level cloud: 33%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.8 In
22:00

N
N

 2 / 4 mph 40 / 40°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
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