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Healey 14 Day Long Range Forecast

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

Northumberland, United Kingdom

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

Reviewing the forecast for Healey Over the next 14 days and the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 14°C expected on the afternoon of Wednesday 18th. The average minimum temperature will be 3°C, dipping to its lowest on the morning of Sunday 15th at 1°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain or sleet. The current forecast indicates Thursday 12th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the afternoon of Thursday 12th, coming from a south westerly direction, and reaching around 38mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 10
Mar		18:00

S
S

 16 / 19 mph 49 / 44°F 77% 1001 mb
Low level cloud: 93%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 17 / 22 mph 49 / 42°F 81% 997 mb
Low level cloud: 98%
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
Wed 11
Mar		00:00

SW
SW

 22 / 29 mph 50 / 43°F 85% 994 mb
Low level cloud: 96%
Mid level cloud: 89%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 27 / 33 mph 44 / 35°F 75% 995 mb
Low level cloud: 79%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 30 / 38 mph 42 / 31°F 81% 997 mb
Low level cloud: 40%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 28 / 32 mph 44 / 34°F 75% 1000 mb
Low level cloud: 87%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 24 / 28 mph 47 / 39°F 72% 1004 mb
Low level cloud: 68%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 20 / 23 mph 48 / 41°F 70% 1006 mb
Low level cloud: 20%
Mid level cloud: 13%
High level cloud: 25%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 18 / 26 mph 44 / 35°F 75% 1008 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 21 / 32 mph 43 / 34°F 73% 1007 mb
Low level cloud: 19%
Mid level cloud: 81%
High level cloud: 90%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Mar		00:00

SW
SW

 27 / 36 mph 44 / 34°F 77% 1004 mb
Low level cloud: 19%
Mid level cloud: 16%
High level cloud: 96%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 33 / 42 mph 45 / 34°F 86% 1002 mb
Low level cloud: 76%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 34 / 44 mph 46 / 36°F 85% 997 mb
Low level cloud: 74%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 32 / 38 mph 49 / 40°F 83% 994 mb
Low level cloud: 67%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 38 / 51 mph 51 / 43°F 84% 990 mb
Low level cloud: 76%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 16 / 21 mph 47 / 40°F 91% 991 mb
Low level cloud: 97%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
18:00

WSW
WSW

 12 / 14 mph 43 / 36°F 94% 993 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

 15 / 19 mph 41 / 33°F 85% 992 mb
Low level cloud: 32%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Mar		00:00

SW
SW

 11 / 14 mph 38 / 31°F 91% 990 mb
Low level cloud: 40%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

WSW
WSW

 15 / 23 mph 36 / 26°F 83% 990 mb
Low level cloud: 23%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 22 / 34 mph 34 / 22°F 75% 990 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 25 / 29 mph 39 / 28°F 72% 991 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
12:00

WSW
WSW

 23 / 26 mph 43 / 34°F 65% 991 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 21 / 24 mph 39 / 30°F 85% 993 mb
Low level cloud: 66%
Mid level cloud: 93%
High level cloud: 4%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 15 / 22 mph 38 / 29°F 84% 994 mb
Low level cloud: 31%
Mid level cloud: 44%
High level cloud: 18%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 14 / 22 mph 37 / 28°F 84% 997 mb
Low level cloud: 14%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Mar		00:00

W
W

 17 / 22 mph 40 / 31°F 78% 999 mb
Low level cloud: 6%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 14 / 23 mph 36 / 27°F 86% 1001 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 12 / 21 mph 35 / 26°F 90% 1002 mb
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 15 / 17 mph 43 / 35°F 81% 1004 mb
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 19 / 22 mph 47 / 40°F 64% 1005 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 16 / 19 mph 48 / 42°F 63% 1006 mb
Low level cloud: 31%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 13 / 22 mph 40 / 33°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 9 / 19 mph 35 / 28°F 89% 1009 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 15
Mar		00:00

WSW
WSW

 8 / 16 mph 34 / 27°F 90% 1010 mb
Low level cloud: 3%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 7 / 14 mph 34 / 28°F 89% 1009 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 8 / 15 mph 37 / 30°F 84% 1008 mb
Low level cloud: 14%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 16 / 18 mph 45 / 38°F 81% 1006 mb
Low level cloud: 98%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 20 / 24 mph 43 / 35°F 87% 1003 mb
Low level cloud: 82%
Mid level cloud: 73%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 21 / 25 mph 45 / 37°F 82% 1002 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 26 / 31 mph 40 / 29°F 86% 1004 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 22 / 35 mph 35 / 23°F 76% 1008 mb
Low level cloud: 11%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 16
Mar		00:00

W
W

 22 / 34 mph 35 / 23°F 79% 1010 mb
Low level cloud: 10%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 21 / 29 mph 35 / 24°F 90% 1012 mb
Low level cloud: 77%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 14 / 17 mph 37 / 28°F 91% 1014 mb
Low level cloud: 78%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 15 mph 41 / 34°F 83% 1015 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 17 / 19 mph 46 / 39°F 77% 1015 mb
Low level cloud: 55%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 13 / 15 mph 46 / 40°F 77% 1014 mb
Low level cloud: 69%
Mid level cloud: 100%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 11 / 14 mph 43 / 37°F 90% 1014 mb
Low level cloud: 95%
Mid level cloud: 89%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 13 / 17 mph 44 / 38°F 88% 1013 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 74%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 17
Mar		00:00

SW
SW

 21 / 34 mph 50 / 44°F 91% 995 mb
Low level cloud: 90%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
91%
0.0 In
06:00

WSW
WSW

 20 / 34 mph 42 / 33°F 86% 985 mb
Low level cloud: 37%
Mid level cloud: 25%
High level cloud: 33%
Most Significant Cloud Type: low
49%
0.0 In
12:00

SW
SW

 17 / 27 mph 46 / 39°F 85% 985 mb
Low level cloud: 85%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
18:00

WSW
WSW

 13 / 21 mph 42 / 35°F 81% 997 mb
Low level cloud: 31%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Wed 18
Mar		00:00

SSW
SSW

 14 / 21 mph 50 / 45°F 77% 1000 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

 23 / 37 mph 41 / 31°F 86% 996 mb
Low level cloud: 81%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
12:00

WSW
WSW

 13 / 19 mph 47 / 42°F 69% 1009 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 91%
Most Significant Cloud Type: low
55%
0.0 In
18:00

W
W

 15 / 22 mph 47 / 41°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Thu 19
Mar		00:00

ESE
ESE

 6 / 12 mph 39 / 34°F 95% 1024 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
37%
0.0 In
06:00

WSW
WSW

 25 / 36 mph 41 / 31°F 72% 1009 mb
Low level cloud: 13%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
35%
0.0 In
12:00

SSE
SSE

 11 / 16 mph 53 / 50°F 54% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
18:00

WSW
WSW

 21 / 31 mph 47 / 40°F 90% 1005 mb
Low level cloud: 93%
Mid level cloud: 50%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
Fri 20
Mar		00:00

SSW
SSW

 4 / 8 mph 41 / 38°F 78% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
06:00

WSW
WSW

 19 / 29 mph 49 / 43°F 90% 1004 mb
Low level cloud: 95%
Mid level cloud: 22%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 9 / 14 mph 54 / 51°F 64% 1023 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

WSW
WSW

 26 / 38 mph 55 / 50°F 86% 1000 mb
Low level cloud: 89%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sat 21
Mar		00:00

WSW
WSW

 7 / 15 mph 37 / 31°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

WSW
WSW

 9 / 13 mph 39 / 33°F 83% 1005 mb
Low level cloud: 70%
Mid level cloud: 68%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 9 / 14 mph 52 / 49°F 76% 1019 mb
Low level cloud: 87%
Mid level cloud: 20%
High level cloud: 81%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 17 / 27 mph 45 / 37°F 80% 1002 mb
Low level cloud: 53%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.0 In
Sun 22
Mar		00:00

SW
SW

 2 / 4 mph 47 / 47°F 90% 1016 mb
Low level cloud: 68%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
06:00

WSW
WSW

 23 / 35 mph 36 / 25°F 75% 1003 mb
Low level cloud: 95%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
12:00

SW
SW

 11 / 17 mph 57 / 55°F 67% 1011 mb
Low level cloud: 5%
Mid level cloud: 27%
High level cloud: 99%
Most Significant Cloud Type: medium
44%
0.0 In
18:00

WSW
WSW

 18 / 28 mph 43 / 34°F 69% 1007 mb
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: low
10%
0.0 In
Mon 23
Mar		00:00

SW
SW

 12 / 18 mph 48 / 43°F 59% 1003 mb
Low level cloud: 0%
Mid level cloud: 63%
High level cloud: 58%
Most Significant Cloud Type: medium
65%
0.0 In
06:00

W
W

 9 / 18 mph 34 / 27°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 14%
Most Significant Cloud Type: medium
55%
0.0 In
12:00

WNW
WNW

 19 / 28 mph 48 / 41°F 54% 1009 mb
Low level cloud: 13%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: low
19%
0.0 In
18:00

NE
NE

 9 / 17 mph 39 / 33°F 84% 1021 mb
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.1 In
Tue 24
Mar		00:00

W
W

 13 / 22 mph 35 / 26°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

W
W

 5 / 9 mph 32 / 27°F 86% 1030 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

W
W

 18 / 28 mph 49 / 42°F 59% 1027 mb
Low level cloud: 9%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
18:00

ENE
ENE

 6 / 12 mph 39 / 35°F 73% 1032 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
51%
0.0 In
Wed 25
Mar		00:00

W
W

 11 / 19 mph 39 / 32°F 91% 1030 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
21%
0.0 In
06:00

SSE
SSE

 4 / 8 mph 32 / 28°F 90% 1030 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
12:00

N
N

 9 / 15 mph 51 / 47°F 56% 1031 mb
Low level cloud: 100%
Mid level cloud: 27%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 5 / 10 mph 43 / 40°F 69% 1027 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
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