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Heacham 14 Day Long Range Forecast

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

Norfolk, United Kingdom

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

For Heacham in the coming two weeks the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 15°C expected on the afternoon of Friday 21st. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Tuesday 18th at 3°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Current predictions suggest Thursday 27th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate.

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

ESE
ESE

 14 / 16 mph 45 / 38°F 67% 1025 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
21:00

ESE
ESE

 12 / 17 mph 43 / 36°F 76% 1025 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
Wed 19
Mar		00:00

ESE
ESE

 11 / 20 mph 40 / 34°F 75% 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
03:00

SE
SE

 9 / 19 mph 39 / 33°F 78% 1023 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
06:00

SE
SE

 7 / 14 mph 38 / 33°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 7 / 10 mph 45 / 40°F 71% 1023 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 2 / 4 mph 49 / 49°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 1 / 2 mph 52 / 51°F 67% 1021 mb
Low level cloud: 11%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 1 / 3 mph 50 / 49°F 78% 1021 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 91%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 9 / 18 mph 46 / 41°F 89% 1023 mb
Low level cloud: 23%
Mid level cloud: 15%
High level cloud: 50%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Mar		00:00

SSW
SSW

 8 / 16 mph 46 / 42°F 91% 1022 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 7 / 15 mph 44 / 40°F 90% 1022 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 58%
Most Significant Cloud Type: medium
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 6 / 13 mph 43 / 39°F 89% 1022 mb
Low level cloud: 11%
Mid level cloud: 33%
High level cloud: 15%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 4 / 8 mph 47 / 45°F 82% 1023 mb
Low level cloud: 9%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 1 / 2 mph 51 / 50°F 75% 1022 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 8 / 12 mph 53 / 49°F 81% 1021 mb
Low level cloud: 19%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 9 / 19 mph 51 / 47°F 82% 1020 mb
Low level cloud: 17%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 9 / 19 mph 48 / 43°F 88% 1020 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Mar		00:00

SE
SE

 8 / 15 mph 50 / 47°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 10 / 21 mph 47 / 42°F 83% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 12 / 25 mph 45 / 39°F 87% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 15 / 25 mph 51 / 45°F 82% 1014 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
12:00

ESE
ESE

 17 / 21 mph 57 / 52°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 16 / 19 mph 59 / 56°F 75% 1008 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 12 / 14 mph 57 / 53°F 79% 1006 mb
Low level cloud: 0%
Mid level cloud: 64%
High level cloud: 32%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 13 / 25 mph 52 / 48°F 83% 1006 mb
Low level cloud: 28%
Mid level cloud: 86%
High level cloud: 91%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Mar		00:00

SE
SE

 16 / 26 mph 50 / 45°F 93% 1004 mb
Low level cloud: 93%
Mid level cloud: 90%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 14 / 24 mph 49 / 44°F 96% 1002 mb
Low level cloud: 86%
Mid level cloud: 58%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSE
SSE

 11 / 22 mph 48 / 43°F 96% 1002 mb
Low level cloud: 68%
Mid level cloud: 49%
High level cloud: 46%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 11 / 18 mph 51 / 46°F 90% 1001 mb
Low level cloud: 12%
Mid level cloud: 47%
High level cloud: 86%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 13 / 19 mph 53 / 49°F 84% 1001 mb
Low level cloud: 79%
Mid level cloud: 67%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 14 / 18 mph 55 / 51°F 83% 999 mb
Low level cloud: 83%
Mid level cloud: 91%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 9 / 11 mph 53 / 50°F 93% 999 mb
Low level cloud: 59%
Mid level cloud: 86%
High level cloud: 63%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 10 / 14 mph 51 / 48°F 94% 999 mb
Low level cloud: 79%
Mid level cloud: 86%
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 23
Mar		00:00

S
S

 8 / 16 mph 45 / 41°F 96% 998 mb
Low level cloud: 51%
Mid level cloud: 51%
High level cloud: 51%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 7 / 14 mph 44 / 40°F 98% 997 mb
Low level cloud: 88%
Mid level cloud: 85%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 4 / 10 mph 44 / 41°F 98% 996 mb
Low level cloud: 84%
Mid level cloud: 88%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

E
E

 1 / 3 mph 46 / 46°F 97% 998 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

N
N

 5 / 9 mph 48 / 46°F 98% 999 mb
Low level cloud: 100%
Mid level cloud: 75%
High level cloud: 89%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 18 / 21 mph 49 / 42°F 97% 1000 mb
Low level cloud: 99%
Mid level cloud: 52%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 16 / 18 mph 48 / 42°F 94% 1002 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 10 / 12 mph 46 / 41°F 92% 1004 mb
Low level cloud: 98%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 24
Mar		00:00

W
W

 10 / 15 mph 43 / 37°F 90% 1004 mb
Low level cloud: 49%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 13 / 20 mph 42 / 35°F 91% 1004 mb
Low level cloud: 17%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 15 / 24 mph 42 / 34°F 88% 1004 mb
Low level cloud: 13%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 18 / 30 mph 43 / 35°F 81% 1005 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
12:00

SSW
SSW

 20 / 31 mph 45 / 37°F 85% 1005 mb
Low level cloud: 91%
Mid level cloud: 75%
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

SW
SW

 21 / 32 mph 46 / 38°F 91% 1005 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

 18 / 30 mph 45 / 37°F 94% 1006 mb
Low level cloud: 100%
Mid level cloud: 94%
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

WSW
WSW

 13 / 24 mph 44 / 37°F 96% 1008 mb
Low level cloud: 95%
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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 25
Mar		00:00

WSW
WSW

 11 / 24 mph 46 / 41°F 86% 1018 mb
Low level cloud: 9%
Mid level cloud: 51%
High level cloud: 58%
Most Significant Cloud Type: medium
78%
0.0 In
06:00

WNW
WNW

 12 / 18 mph 41 / 34°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
47%
0.0 In
12:00

SW
SW

 21 / 34 mph 44 / 36°F 86% 1014 mb
Low level cloud: 98%
Mid level cloud: 71%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 8 / 13 mph 52 / 49°F 82% 1018 mb
Low level cloud: 3%
Mid level cloud: 28%
High level cloud: 6%
Most Significant Cloud Type: medium
36%
0.0 In
Wed 26
Mar		00:00

WNW
WNW

 8 / 15 mph 47 / 43°F 98% 1015 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

 8 / 13 mph 46 / 41°F 89% 1016 mb
Low level cloud: 11%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

E
E

 3 / 6 mph 48 / 47°F 70% 1021 mb
Low level cloud: 1%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
18:00

S
S

 10 / 16 mph 49 / 45°F 75% 1018 mb
Low level cloud: 87%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 27
Mar		00:00

SSW
SSW

 21 / 32 mph 48 / 40°F 86% 1010 mb
Low level cloud: 38%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
84%
0.0 In
06:00

S
S

 15 / 26 mph 42 / 34°F 78% 1014 mb
Low level cloud: 33%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
63%
0.0 In
12:00

SW
SW

 22 / 34 mph 54 / 49°F 72% 998 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: low
92%
0.1 In
18:00

SSE
SSE

 14 / 20 mph 49 / 44°F 77% 1010 mb
Low level cloud: 7%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Fri 28
Mar		00:00

WSW
WSW

 19 / 32 mph 42 / 33°F 91% 989 mb
Low level cloud: 29%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.5 In
06:00

SE
SE

 9 / 18 mph 42 / 37°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

WSW
WSW

 17 / 29 mph 45 / 37°F 70% 992 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
62%
0.0 In
18:00

E
E

 11 / 14 mph 47 / 43°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 29
Mar		00:00

WNW
WNW

 7 / 15 mph 37 / 31°F 92% 999 mb
Low level cloud: 97%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNE
NNE

 3 / 5 mph 44 / 42°F 82% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NNW
NNW

 15 / 32 mph 37 / 28°F 70% 1009 mb
Low level cloud: 16%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.2 In
18:00

SSW
SSW

 12 / 20 mph 54 / 50°F 74% 1012 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
9%
0.0 In
Sun 30
Mar		00:00

W
W

 8 / 16 mph 38 / 32°F 78% 1015 mb
Low level cloud: 46%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
06:00

WSW
WSW

 16 / 26 mph 45 / 38°F 86% 1010 mb
Low level cloud: 5%
Mid level cloud: 89%
High level cloud: 14%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NNW
NNW

 6 / 12 mph 40 / 35°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

WNW
WNW

 15 / 24 mph 48 / 42°F 76% 1011 mb
Low level cloud: 20%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.1 In
Mon 31
Mar		00:00

S
S

 9 / 17 mph 40 / 34°F 83% 1027 mb
Low level cloud: 26%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
06:00

NW
NW

 19 / 31 mph 40 / 31°F 78% 1020 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
12:00

SSW
SSW

 17 / 32 mph 49 / 43°F 68% 1026 mb
Low level cloud: 7%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
0.0 In
18:00

E
E

 5 / 10 mph 42 / 39°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 9%
Most Significant Cloud Type: medium
18%
0.0 In
Tue 01
Apr		00:00

SW
SW

 13 / 24 mph 44 / 38°F 90% 1027 mb
Low level cloud: 94%
Mid level cloud: 49%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

 10 / 18 mph 40 / 34°F 80% 1029 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: medium
9%
0.0 In
12:00

ENE
ENE

 10 / 19 mph 45 / 40°F 79% 1031 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
18:00

SSW
SSW

 8 / 17 mph 51 / 47°F 78% 1028 mb
Low level cloud: 84%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
98%
0.0 In
Wed 02
Apr		00:00

ESE
ESE

 8 / 15 mph 46 / 42°F 91% 1029 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
5%
0.0 In
06:00

S
S

 10 / 21 mph 42 / 36°F 87% 1027 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
12:00

ENE
ENE

 12 / 23 mph 53 / 49°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
0.0 In
18:00

ESE
ESE

 12 / 20 mph 50 / 46°F 69% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
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