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North Andover 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for North Andover

Massachusetts, United States Of America

Long range weather outlook for North Andover includes 14 day forecast summary:

For North Andover in the coming two weeks the average daytime maximum temperature will be around 3°C, with a high for the two weeks of 9°C expected on the evening of Friday 26th. The mean minimum temperature will be -2°C, dipping to its lowest on the morning of Monday 29th at -5°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain, sleet or snow. The indicators are that Friday 26th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 19
Dec		01:00

SSE
SSE

 4 / 9 mph 40 / 37°F 98% 1016 mb
Low level cloud: 100%
Mid level cloud: 68%
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

SSE
SSE

 7 / 15 mph 46 / 43°F 97% 1012 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 69%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 13 / 21 mph 54 / 50°F 95% 1007 mb
Low level cloud: 100%
Mid level cloud: 46%
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

S
S

 17 / 28 mph 57 / 53°F 86% 1001 mb
Low level cloud: 51%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

S
S

 25 / 37 mph 58 / 54°F 87% 989 mb
Low level cloud: 100%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

W
W

 11 / 16 mph 44 / 38°F 87% 990 mb
Low level cloud: 24%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

W
W

 13 / 20 mph 41 / 33°F 77% 994 mb
Low level cloud: 20%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 16 / 22 mph 32 / 21°F 64% 1000 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		19:00

SSW
SSW

 7 / 11 mph 34 / 28°F 54% 1019 mb
Low level cloud: 0%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 12 / 18 mph 34 / 25°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 78%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec		01:00

SSW
SSW

 13 / 21 mph 36 / 27°F 59% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 12 / 20 mph 38 / 30°F 62% 1012 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 59%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 9 / 14 mph 36 / 29°F 65% 1012 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

WSW
WSW

 12 / 16 mph 41 / 34°F 58% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: high
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 14 / 16 mph 41 / 33°F 49% 1013 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

WNW
WNW

 13 / 16 mph 34 / 25°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
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

WNW
WNW

 10 / 15 mph 30 / 22°F 56% 1018 mb
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 10 / 14 mph 29 / 20°F 55% 1020 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 22
Dec		01:00

NW
NW

 11 / 15 mph 28 / 18°F 62% 1021 mb
Low level cloud: 73%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 13 / 16 mph 25 / 13°F 49% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 13 / 16 mph 24 / 12°F 45% 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
10:00

NW
NW

 13 / 15 mph 27 / 16°F 37% 1029 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
13:00

NW
NW

 12 / 13 mph 31 / 22°F 33% 1028 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 7 / 9 mph 30 / 23°F 43% 1029 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 5 / 7 mph 29 / 23°F 53% 1029 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 6 / 10 mph 28 / 21°F 63% 1028 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 23
Dec		01:00

SW
SW

 6 / 10 mph 30 / 23°F 63% 1028 mb
Low level cloud: 51%
Mid level cloud: 51%
High level cloud: 43%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 5 / 10 mph 29 / 23°F 60% 1026 mb
Low level cloud: 56%
Mid level cloud: 100%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 7 / 12 mph 28 / 21°F 86% 1026 mb
Low level cloud: 63%
Mid level cloud: 96%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 9 / 14 mph 33 / 25°F 69% 1024 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 6 / 7 mph 36 / 31°F 94% 1018 mb
Low level cloud: 89%
Mid level cloud: 50%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 3 / 4 mph 36 / 33°F 99% 1015 mb
Low level cloud: 97%
Mid level cloud: 87%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

WSW
WSW

 5 / 7 mph 34 / 29°F 98% 1013 mb
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 4 / 7 mph 32 / 28°F 96% 1012 mb
Low level cloud: 44%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 24
Dec		01:00

WNW
WNW

 6 / 10 mph 31 / 26°F 93% 1013 mb
Low level cloud: 19%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 7 / 13 mph 31 / 24°F 89% 1015 mb
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 7 / 12 mph 31 / 24°F 81% 1019 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 7 / 9 mph 36 / 30°F 66% 1023 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 7 / 9 mph 39 / 34°F 57% 1024 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 6 / 9 mph 35 / 30°F 71% 1027 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
19:00

WNW
WNW

 5 / 9 mph 33 / 28°F 80% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 5 / 10 mph 30 / 25°F 81% 1028 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 34%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 25
Dec		01:00

WSW
WSW

 4 / 9 mph 30 / 25°F 81% 1027 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 92%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 5 / 8 mph 31 / 26°F 81% 1025 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 6 / 10 mph 32 / 26°F 79% 1024 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 89%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 8 / 11 mph 35 / 29°F 81% 1023 mb
Low level cloud: 2%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 9 / 13 mph 40 / 33°F 72% 1019 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 6 / 8 mph 36 / 31°F 98% 1020 mb
Low level cloud: 89%
Mid level cloud: 62%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 4 / 6 mph 35 / 32°F 98% 1020 mb
Low level cloud: 77%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 2 / 4 mph 32 / 31°F 96% 1019 mb
Low level cloud: 30%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 26
Dec		01:00

N
N

 5 / 6 mph 35 / 30°F 83% 1015 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
0.0 In
07:00

ENE
ENE

 4 / 7 mph 30 / 26°F 75% 1016 mb
Low level cloud: 92%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.0 In
13:00

ENE
ENE

 3 / 4 mph 34 / 31°F 97% 1009 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

WNW
WNW

 11 / 19 mph 44 / 38°F 83% 1008 mb
Low level cloud: 76%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
Sat 27
Dec		01:00

ESE
ESE

 1 / 2 mph 38 / 38°F 97% 1009 mb
Low level cloud: 72%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 4 / 6 mph 38 / 34°F 90% 1016 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
13:00

NW
NW

 5 / 7 mph 37 / 33°F 74% 1008 mb
Low level cloud: 1%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

NW
NW

 11 / 15 mph 25 / 15°F 65% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
Sun 28
Dec		01:00

S
S

 7 / 9 mph 33 / 26°F 54% 1019 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WNW
WNW

 11 / 15 mph 23 / 13°F 60% 1028 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

WNW
WNW

 10 / 14 mph 42 / 36°F 68% 1011 mb
Low level cloud: 87%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.1 In
19:00

NW
NW

 11 / 16 mph 26 / 17°F 56% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 29
Dec		01:00

NW
NW

 12 / 17 mph 27 / 17°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

WNW
WNW

 4 / 5 mph 29 / 25°F 54% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

SSE
SSE

 2 / 2 mph 37 / 37°F 44% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

WNW
WNW

 5 / 6 mph 32 / 28°F 65% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
Tue 30
Dec		01:00

ESE
ESE

 5 / 6 mph 32 / 27°F 63% 1025 mb
Low level cloud: 48%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
91%
0.0 In
07:00

N
N

 3 / 3 mph 30 / 28°F 63% 1023 mb
Low level cloud: 0%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: medium
83%
0.0 In
13:00

E
E

 15 / 23 mph 33 / 22°F 98% 1011 mb
Low level cloud: 95%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
19:00

NNW
NNW

 2 / 3 mph 41 / 41°F 77% 1022 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 74%
Most Significant Cloud Type: medium
17%
0.0 In
Wed 31
Dec		01:00

N
N

 12 / 18 mph 34 / 25°F 97% 998 mb
Low level cloud: 96%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.8 In
07:00

NNE
NNE

 4 / 7 mph 32 / 28°F 88% 1019 mb
Low level cloud: 96%
Mid level cloud: 91%
High level cloud: 57%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 8 / 10 mph 32 / 24°F 96% 1003 mb
Low level cloud: 78%
Mid level cloud: 63%
High level cloud: 1%
Most Significant Cloud Type: low
99%
0.2 In
19:00

NNE
NNE

 9 / 16 mph 36 / 29°F 97% 1012 mb
Low level cloud: 97%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Thu 01
Jan		01:00

NW
NW

 6 / 7 mph 27 / 21°F 89% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 14%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NNE
NNE

 4 / 5 mph 32 / 29°F 92% 1009 mb
Low level cloud: 98%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
13:00

SW
SW

 2 / 3 mph 39 / 38°F 87% 1016 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
0.0 In
19:00

SW
SW

 2 / 3 mph 35 / 33°F 98% 1008 mb
Low level cloud: 94%
Mid level cloud: 50%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.1 In
Fri 02
Jan		01:00

SSE
SSE

 4 / 6 mph 33 / 30°F 95% 1009 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 40%
Most Significant Cloud Type: medium
87%
0.0 In
07:00

WNW
WNW

 9 / 12 mph 30 / 22°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
13:00

WNW
WNW

 18 / 24 mph 37 / 28°F 80% 1002 mb
Low level cloud: 25%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.2 In
19:00

WSW
WSW

 6 / 8 mph 39 / 34°F 90% 1010 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
0.0 In
Sat 03
Jan		01:00

WNW
WNW

 11 / 16 mph 17 / 4°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

WSW
WSW

 7 / 9 mph 31 / 25°F 86% 1008 mb
Low level cloud: 2%
Mid level cloud: 15%
High level cloud: 20%
Most Significant Cloud Type: medium
22%
0.0 In
13:00

W
W

 13 / 16 mph 32 / 22°F 71% 1017 mb
Low level cloud: 71%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
19:00

ESE
ESE

 4 / 6 mph 35 / 31°F 94% 1001 mb
Low level cloud: 64%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
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