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West Linn 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for West Linn

Oregon, United States Of America

Long range weather outlook for West Linn includes 14 day forecast summary:

For West Linn in the coming two weeks the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 31°C expected on the afternoon of Tuesday 25th. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Monday 1st at 8°C. Expect the next 14 days have mixed weather with some days dry and some seeing a little rain. Predictions are Thursday 27th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 22
Jun		01:00

ESE
ESE

 0 / 1 mph 57 / 58°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 0 / 1 mph 57 / 58°F 71% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 2 / 2 mph 68 / 65°F 59% 1014 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 3 / 3 mph 79 / 77°F 40% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 18%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 5 mph 84 / 80°F 29% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 7 / 8 mph 86 / 81°F 30% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 6 / 6 mph 78 / 78°F 63% 1011 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 2 / 3 mph 61 / 61°F 86% 1014 mb
Low level cloud: 66%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Jun		19:00

NNW
NNW

 4 / 5 mph 64 / 64°F 54% 1017 mb
Low level cloud: 7%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 2 / 4 mph 55 / 56°F 72% 1018 mb
Low level cloud: 7%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 24
Jun		01:00

NNE
NNE

 2 / 3 mph 52 / 52°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 2 / 3 mph 47 / 47°F 92% 1019 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 3 / 3 mph 58 / 57°F 73% 1019 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 4 / 5 mph 69 / 67°F 48% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 4 / 4 mph 78 / 76°F 35% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 4 / 4 mph 80 / 77°F 32% 1014 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

NNW
NNW

 4 / 5 mph 75 / 76°F 53% 1014 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
22:00

N
N

 2 / 2 mph 63 / 63°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
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 25
Jun		01:00

NNE
NNE

 2 / 2 mph 55 / 55°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 5%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 2 / 3 mph 51 / 51°F 87% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 3 / 4 mph 61 / 59°F 68% 1015 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
10:00

NNW
NNW

 4 / 5 mph 75 / 76°F 44% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 4 / 4 mph 85 / 81°F 30% 1011 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

 3 / 4 mph 87 / 82°F 28% 1009 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
19:00

SW
SW

 4 / 5 mph 83 / 81°F 54% 1010 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 5 mph 65 / 65°F 72% 1012 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
Wed 26
Jun		01:00

S
S

 2 / 4 mph 57 / 58°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 3 / 5 mph 52 / 52°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 4 / 4 mph 60 / 59°F 71% 1014 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 5 / 6 mph 70 / 67°F 55% 1014 mb
Low level cloud: 37%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 8 / 10 mph 74 / 76°F 50% 1013 mb
Low level cloud: 10%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 8 / 9 mph 66 / 66°F 67% 1015 mb
Low level cloud: 88%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 3 mph 61 / 60°F 90% 1016 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 2 / 2 mph 57 / 57°F 91% 1017 mb
Low level cloud: 81%
Mid level cloud: 80%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 27
Jun		01:00

SSW
SSW

 4 / 7 mph 55 / 54°F 92% 1017 mb
Low level cloud: 95%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 5 / 8 mph 54 / 53°F 92% 1018 mb
Low level cloud: 96%
Mid level cloud: 92%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 7 / 10 mph 55 / 53°F 90% 1018 mb
Low level cloud: 94%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 7 / 9 mph 59 / 58°F 81% 1019 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 5 / 6 mph 67 / 64°F 75% 1019 mb
Low level cloud: 61%
Mid level cloud: 30%
High level cloud: 1%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 4 / 5 mph 69 / 66°F 68% 1018 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 6 / 8 mph 68 / 65°F 58% 1018 mb
Low level cloud: 4%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 2 / 4 mph 54 / 55°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 28
Jun		01:00

ESE
ESE

 1 / 2 mph 50 / 50°F 89% 1019 mb
Low level cloud: 3%
Mid level cloud: 25%
High level cloud: 13%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 2 / 4 mph 48 / 49°F 93% 1019 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 3 / 4 mph 58 / 56°F 75% 1019 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 4 / 4 mph 69 / 67°F 52% 1017 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 41%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 5 / 6 mph 78 / 76°F 40% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 6 / 8 mph 82 / 78°F 35% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 6 / 10 mph 73 / 69°F 54% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 86%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 2 / 3 mph 60 / 60°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 29
Jun		04:00

NE
NE

 2 / 3 mph 54 / 54°F 93% 1019 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
10:00

N
N

 3 / 4 mph 86 / 84°F 32% 1011 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 82%
Most Significant Cloud Type: medium
12%
0.0 In
16:00

NW
NW

 6 / 7 mph 90 / 88°F 30% 1010 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 13%
Most Significant Cloud Type: medium
25%
0.0 In
22:00

SSW
SSW

 2 / 3 mph 69 / 69°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 49%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 30
Jun		04:00

NNE
NNE

 1 / 1 mph 62 / 62°F 94% 1017 mb
Low level cloud: 15%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: low
20%
0.0 In
10:00

SW
SW

 5 / 6 mph 75 / 77°F 55% 1015 mb
Low level cloud: 16%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
16:00

NNW
NNW

 8 / 11 mph 83 / 83°F 41% 1017 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
22:00

NNW
NNW

 5 / 9 mph 61 / 61°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 01
Jul		04:00

SSE
SSE

 1 / 1 mph 52 / 52°F 88% 1022 mb
Low level cloud: 52%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
10:00

WNW
WNW

 2 / 5 mph 68 / 68°F 52% 1024 mb
Low level cloud: 30%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
16:00

NW
NW

 6 / 7 mph 67 / 67°F 56% 1021 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
22:00

NNW
NNW

 2 / 3 mph 62 / 62°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Tue 02
Jul		04:00

NNE
NNE

 1 / 2 mph 52 / 52°F 94% 1022 mb
Low level cloud: 33%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
10:00

NNW
NNW

 3 / 6 mph 73 / 76°F 51% 1022 mb
Low level cloud: 18%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
19%
0.0 In
16:00

N
N

 6 / 8 mph 83 / 82°F 34% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
22:00

N
N

 2 / 4 mph 63 / 63°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Wed 03
Jul		04:00

NNE
NNE

 2 / 3 mph 59 / 60°F 92% 1016 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
10:00

N
N

 5 / 8 mph 72 / 76°F 49% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

NNW
NNW

 7 / 9 mph 90 / 88°F 27% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
22:00

N
N

 3 / 5 mph 66 / 66°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 04
Jul		04:00

NE
NE

 2 / 3 mph 57 / 58°F 90% 1019 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
10:00

NNW
NNW

 4 / 8 mph 73 / 76°F 47% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

NNW
NNW

 9 / 11 mph 84 / 81°F 27% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

NNW
NNW

 3 / 6 mph 61 / 61°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Fri 05
Jul		04:00

NNE
NNE

 2 / 3 mph 55 / 56°F 90% 1019 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
10:00

WSW
WSW

 4 / 7 mph 69 / 69°F 47% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

NNW
NNW

 7 / 9 mph 92 / 88°F 22% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

N
N

 1 / 2 mph 61 / 61°F 72% 1019 mb
Low level cloud: 8%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
Sat 06
Jul		04:00

NE
NE

 1 / 1 mph 62 / 62°F 80% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

NNW
NNW

 3 / 6 mph 71 / 71°F 46% 1020 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
16:00

WSW
WSW

 6 / 8 mph 92 / 91°F 29% 1009 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
22:00

N
N

 3 / 5 mph 61 / 61°F 61% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 07
Jul		04:00

ENE
ENE

 1 / 1 mph 57 / 57°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

NNW
NNW

 5 / 9 mph 69 / 69°F 45% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

NW
NW

 6 / 8 mph 83 / 81°F 31% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: medium
11%
0.0 In
22:00

N
N

 2 / 4 mph 64 / 64°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
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