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Brehat Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Brehat Island

France

Long range weather outlook for Brehat Island includes 14 day forecast summary:

Over the next 14 days the Brehat Island forecast suggests the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 28°C expected on the afternoon of Saturday 5th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Saturday 5th at 12°C. The coming 14 days will have mostly dry days although Sunday is likely to see a little rain. Current predictions suggest Sunday 6th 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
Tue 01
Jul		19:00

NW
NW

 12 / 13 mph 72 / 76°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 11 / 13 mph 69 / 67°F 95% 1017 mb
Low level cloud: 31%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 02
Jul		01:00

WNW
WNW

 8 / 12 mph 63 / 63°F 95% 1018 mb
Low level cloud: 25%
Mid level cloud: 10%
High level cloud: 14%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 12 / 19 mph 61 / 61°F 94% 1018 mb
Low level cloud: 31%
Mid level cloud: 27%
High level cloud: 96%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 12 / 16 mph 63 / 61°F 92% 1019 mb
Low level cloud: 32%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 17 / 20 mph 68 / 67°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 20 / 23 mph 72 / 76°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 17 / 19 mph 72 / 76°F 67% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 18 / 20 mph 70 / 69°F 71% 1024 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
22:00

NNW
NNW

 16 / 18 mph 66 / 65°F 79% 1026 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
Thu 03
Jul		01:00

NNW
NNW

 13 / 19 mph 60 / 60°F 82% 1027 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

N
N

 11 / 17 mph 58 / 56°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 11 / 16 mph 59 / 56°F 78% 1028 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

NNE
NNE

 10 / 11 mph 64 / 62°F 67% 1029 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
13:00

NNE
NNE

 11 / 13 mph 67 / 66°F 62% 1030 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
16:00

N
N

 13 / 15 mph 68 / 67°F 62% 1029 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

NNW
NNW

 14 / 16 mph 65 / 64°F 68% 1029 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
22:00

NNW
NNW

 12 / 17 mph 62 / 61°F 83% 1029 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
Fri 04
Jul		01:00

N
N

 13 / 17 mph 62 / 62°F 81% 1030 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 10 / 15 mph 59 / 57°F 82% 1029 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

 9 / 13 mph 61 / 59°F 76% 1030 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

NNE
NNE

 8 / 9 mph 67 / 66°F 66% 1030 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
13:00

N
N

 9 / 10 mph 73 / 76°F 63% 1029 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
16:00

N
N

 9 / 11 mph 75 / 76°F 62% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 10 / 11 mph 69 / 68°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 9 / 10 mph 66 / 64°F 85% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 05
Jul		01:00

NW
NW

 7 / 15 mph 56 / 54°F 85% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 6 / 12 mph 55 / 53°F 87% 1023 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 10%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 7 / 15 mph 56 / 53°F 85% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 35%
Most Significant Cloud Type: high
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 9 / 10 mph 76 / 77°F 64% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 83%
Most Significant Cloud Type: high
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 15 / 17 mph 83 / 83°F 56% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 16%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 21 / 24 mph 82 / 82°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 19 / 22 mph 73 / 76°F 78% 1015 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 17 / 32 mph 60 / 60°F 91% 1014 mb
Low level cloud: 97%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 06
Jul		01:00

WNW
WNW

 18 / 27 mph 61 / 61°F 88% 1014 mb
Low level cloud: 61%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 15 / 23 mph 59 / 59°F 82% 1014 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 59%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 19 / 30 mph 61 / 59°F 82% 1013 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 30%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 21 / 25 mph 64 / 63°F 73% 1014 mb
Low level cloud: 42%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 21 / 25 mph 67 / 66°F 72% 1015 mb
Low level cloud: 26%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 21 / 23 mph 68 / 66°F 69% 1016 mb
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 19 / 22 mph 65 / 64°F 74% 1017 mb
Low level cloud: 35%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 13 / 16 mph 63 / 62°F 76% 1018 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 07
Jul		01:00

WNW
WNW

 13 / 23 mph 57 / 54°F 85% 1019 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 13 / 23 mph 56 / 53°F 89% 1018 mb
Low level cloud: 19%
Mid level cloud: 2%
High level cloud: 18%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 12 / 21 mph 58 / 54°F 86% 1018 mb
Low level cloud: 14%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 13 / 15 mph 67 / 66°F 68% 1018 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 14 / 16 mph 71 / 69°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 20%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 14 / 16 mph 68 / 67°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 8 / 13 mph 62 / 61°F 78% 1016 mb
Low level cloud: 5%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 1 / 2 mph 63 / 59°F 85% 1016 mb
Low level cloud: 34%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 08
Jul		01:00

NW
NW

 13 / 21 mph 60 / 60°F 85% 1015 mb
Low level cloud: 17%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
18%
0.0 In
07:00

ENE
ENE

 10 / 18 mph 61 / 61°F 76% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

E
E

 15 / 25 mph 60 / 60°F 95% 1012 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NW
NW

 13 / 18 mph 66 / 66°F 67% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 49%
Most Significant Cloud Type: high
48%
0.0 In
Wed 09
Jul		01:00

NW
NW

 10 / 16 mph 59 / 59°F 79% 1022 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
50%
0.0 In
07:00

W
W

 6 / 10 mph 58 / 57°F 85% 1024 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 45%
Most Significant Cloud Type: medium
8%
0.0 In
13:00

NNW
NNW

 11 / 15 mph 67 / 67°F 77% 1026 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
19:00

NW
NW

 11 / 15 mph 65 / 65°F 72% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Thu 10
Jul		01:00

WSW
WSW

 11 / 22 mph 60 / 60°F 94% 1022 mb
Low level cloud: 27%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: low
35%
0.0 In
07:00

W
W

 6 / 9 mph 59 / 58°F 87% 1024 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 16%
Most Significant Cloud Type: low
7%
0.0 In
13:00

W
W

 18 / 26 mph 71 / 71°F 76% 1020 mb
Low level cloud: 88%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NW
NW

 11 / 16 mph 66 / 66°F 80% 1022 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
0.0 In
Fri 11
Jul		01:00

WSW
WSW

 13 / 21 mph 65 / 65°F 94% 1020 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
07:00

NW
NW

 8 / 13 mph 61 / 61°F 86% 1022 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
13:00

WNW
WNW

 15 / 22 mph 69 / 69°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

NW
NW

 10 / 15 mph 68 / 68°F 82% 1021 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: medium
16%
0.0 In
Sat 12
Jul		01:00

WSW
WSW

 8 / 17 mph 60 / 60°F 94% 1022 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
07:00

NW
NW

 8 / 13 mph 62 / 62°F 89% 1020 mb
Low level cloud: 10%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
13:00

N
N

 8 / 11 mph 71 / 71°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

NW
NW

 12 / 17 mph 67 / 67°F 79% 1021 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
0.0 In
Sun 13
Jul		01:00

NW
NW

 7 / 11 mph 66 / 66°F 94% 1023 mb
Low level cloud: 34%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
07:00

NW
NW

 8 / 13 mph 62 / 62°F 90% 1022 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
13:00

N
N

 8 / 12 mph 73 / 77°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

NW
NW

 10 / 15 mph 68 / 68°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 98%
Most Significant Cloud Type: medium
7%
0.0 In
Mon 14
Jul		01:00

NW
NW

 7 / 11 mph 66 / 66°F 93% 1022 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
07:00

NNE
NNE

 5 / 10 mph 64 / 64°F 93% 1023 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
5%
0.0 In
13:00

NNW
NNW

 9 / 13 mph 74 / 77°F 76% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

N
N

 9 / 13 mph 71 / 71°F 78% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 15
Jul		01:00

NW
NW

 9 / 15 mph 66 / 66°F 95% 1022 mb
Low level cloud: 5%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
07:00

NE
NE

 4 / 8 mph 62 / 62°F 88% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

N
N

 11 / 16 mph 74 / 77°F 80% 1022 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

N
N

 14 / 21 mph 75 / 78°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
0.0 In
Wed 16
Jul		01:00

NE
NE

 8 / 15 mph 65 / 65°F 89% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

NNE
NNE

 8 / 17 mph 63 / 63°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 36%
Most Significant Cloud Type: medium
44%
0.0 In
13:00

NNE
NNE

 13 / 19 mph 73 / 77°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

NE
NE

 5 / 11 mph 71 / 71°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 8%
Most Significant Cloud Type: medium
9%
0.0 In

Other Locations Near to Brehat Island

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