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Witham 14 Day Long Range Forecast

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

Lincolnshire, United Kingdom

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

The forecast for Witham in the coming two weeks is predicting the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 20°C expected on the afternoon of Sunday 2nd. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Wednesday 5th at 4°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Sunday 9th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 02
Jun		18:00

WNW
WNW

 12 / 18 mph 64 / 63°F 80% 1024 mb
Low level cloud: 77%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 14 mph 57 / 55°F 93% 1024 mb
Low level cloud: 24%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun		00:00

WNW
WNW

 7 / 14 mph 52 / 50°F 96% 1024 mb
Low level cloud: 37%
Mid level cloud: 47%
High level cloud: 40%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 7 / 12 mph 52 / 49°F 96% 1022 mb
Low level cloud: 25%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 9 / 13 mph 56 / 52°F 92% 1021 mb
Low level cloud: 40%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 11 / 15 mph 60 / 60°F 79% 1021 mb
Low level cloud: 89%
Mid level cloud: 23%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 9 / 13 mph 62 / 61°F 78% 1021 mb
Low level cloud: 81%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 7 / 11 mph 62 / 61°F 81% 1020 mb
Low level cloud: 93%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 8 / 12 mph 62 / 61°F 80% 1019 mb
Low level cloud: 74%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 13 mph 56 / 53°F 91% 1018 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 94%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Jun		00:00

W
W

 7 / 13 mph 52 / 50°F 95% 1016 mb
Low level cloud: 8%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 7 / 14 mph 50 / 47°F 94% 1014 mb
Low level cloud: 24%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 10 / 16 mph 55 / 51°F 92% 1012 mb
Low level cloud: 89%
Mid level cloud: 68%
High level cloud: 28%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 14 / 21 mph 56 / 52°F 88% 1009 mb
Low level cloud: 68%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 16 / 23 mph 58 / 54°F 88% 1007 mb
Low level cloud: 96%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 16 / 26 mph 56 / 51°F 89% 1006 mb
Low level cloud: 36%
Mid level cloud: 56%
High level cloud: 5%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 16 / 24 mph 52 / 47°F 87% 1007 mb
Low level cloud: 86%
Mid level cloud: 80%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 8 / 13 mph 49 / 45°F 91% 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
Wed 05
Jun		00:00

WSW
WSW

 8 / 14 mph 44 / 40°F 91% 1011 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
03:00

WSW
WSW

 8 / 16 mph 41 / 36°F 91% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 9 / 15 mph 46 / 40°F 86% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 14 / 18 mph 53 / 48°F 64% 1013 mb
Low level cloud: 76%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 14 / 19 mph 55 / 51°F 64% 1014 mb
Low level cloud: 55%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 13 / 19 mph 56 / 52°F 59% 1014 mb
Low level cloud: 25%
Mid level cloud: 80%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 11 / 18 mph 54 / 50°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 91%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 8 / 15 mph 49 / 45°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Jun		00:00

SW
SW

 7 / 15 mph 44 / 40°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 8%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 7 / 14 mph 42 / 37°F 94% 1016 mb
Low level cloud: 1%
Mid level cloud: 27%
High level cloud: 45%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 6 / 10 mph 47 / 43°F 85% 1016 mb
Low level cloud: 2%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 8 / 10 mph 55 / 51°F 70% 1016 mb
Low level cloud: 30%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 11 / 14 mph 57 / 54°F 62% 1015 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 12 / 17 mph 59 / 55°F 65% 1013 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 11 / 16 mph 57 / 53°F 75% 1012 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 9 / 15 mph 53 / 48°F 86% 1011 mb
Low level cloud: 17%
Mid level cloud: 47%
High level cloud: 35%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Jun		00:00

SSW
SSW

 15 / 24 mph 50 / 45°F 80% 1010 mb
Low level cloud: 64%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 14 / 23 mph 50 / 45°F 90% 1009 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 11 / 17 mph 52 / 47°F 89% 1009 mb
Low level cloud: 69%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 16 / 21 mph 55 / 50°F 72% 1010 mb
Low level cloud: 46%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 15 / 22 mph 56 / 51°F 70% 1010 mb
Low level cloud: 20%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 17 / 25 mph 56 / 50°F 77% 1010 mb
Low level cloud: 52%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 13 / 20 mph 55 / 51°F 72% 1011 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 8 / 15 mph 49 / 45°F 86% 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
Sat 08
Jun		00:00

WSW
WSW

 11 / 21 mph 44 / 38°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 12 / 23 mph 42 / 36°F 89% 1013 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 15 / 22 mph 47 / 40°F 85% 1013 mb
Low level cloud: 28%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 19 / 26 mph 54 / 47°F 72% 1013 mb
Low level cloud: 49%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 24 / 29 mph 55 / 50°F 70% 1013 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 24 / 30 mph 59 / 53°F 70% 1013 mb
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 18 / 29 mph 55 / 49°F 84% 1014 mb
Low level cloud: 39%
Mid level cloud: 25%
High level cloud: 44%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 16 / 27 mph 50 / 44°F 83% 1016 mb
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 09
Jun		00:00

NE
NE

 7 / 14 mph 49 / 46°F 95% 1020 mb
Low level cloud: 8%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

ENE
ENE

 3 / 5 mph 55 / 55°F 84% 1022 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 21%
Most Significant Cloud Type: medium
19%
0.0 In
12:00

SE
SE

 7 / 13 mph 64 / 64°F 66% 1025 mb
Low level cloud: 58%
Mid level cloud: 16%
High level cloud: 20%
Most Significant Cloud Type: low
65%
0.0 In
18:00

N
N

 6 / 10 mph 63 / 63°F 82% 1015 mb
Low level cloud: 22%
Mid level cloud: 73%
High level cloud: 7%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 10
Jun		00:00

WNW
WNW

 3 / 6 mph 51 / 50°F 91% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

NW
NW

 16 / 32 mph 45 / 38°F 82% 1007 mb
Low level cloud: 53%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
12:00

WNW
WNW

 15 / 32 mph 59 / 56°F 77% 1017 mb
Low level cloud: 68%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
18:00

NNW
NNW

 10 / 19 mph 61 / 61°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Tue 11
Jun		00:00

W
W

 9 / 18 mph 48 / 44°F 95% 1018 mb
Low level cloud: 67%
Mid level cloud: 40%
High level cloud: 10%
Most Significant Cloud Type: low
82%
0.0 In
06:00

NNW
NNW

 7 / 14 mph 50 / 47°F 83% 1021 mb
Low level cloud: 36%
Mid level cloud: 73%
High level cloud: 20%
Most Significant Cloud Type: low
63%
0.0 In
12:00

WNW
WNW

 6 / 12 mph 56 / 55°F 77% 1021 mb
Low level cloud: 89%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: low
93%
0.0 In
18:00

WSW
WSW

 8 / 16 mph 61 / 61°F 75% 1020 mb
Low level cloud: 25%
Mid level cloud: 27%
High level cloud: 27%
Most Significant Cloud Type: low
37%
0.0 In
Wed 12
Jun		00:00

WNW
WNW

 4 / 9 mph 52 / 50°F 90% 1021 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 65%
Most Significant Cloud Type: medium
21%
0.0 In
06:00

WSW
WSW

 5 / 10 mph 53 / 52°F 75% 1018 mb
Low level cloud: 1%
Mid level cloud: 53%
High level cloud: 12%
Most Significant Cloud Type: medium
54%
0.0 In
12:00

WSW
WSW

 5 / 11 mph 60 / 60°F 72% 1019 mb
Low level cloud: 49%
Mid level cloud: 47%
High level cloud: 97%
Most Significant Cloud Type: low
76%
0.0 In
18:00

NW
NW

 4 / 8 mph 59 / 59°F 86% 1014 mb
Low level cloud: 37%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.1 In
Thu 13
Jun		00:00

W
W

 6 / 14 mph 52 / 50°F 92% 1015 mb
Low level cloud: 87%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSW
SSW

 4 / 9 mph 53 / 53°F 95% 1013 mb
Low level cloud: 34%
Mid level cloud: 49%
High level cloud: 63%
Most Significant Cloud Type: low
58%
0.0 In
12:00

SW
SW

 7 / 15 mph 54 / 53°F 89% 1010 mb
Low level cloud: 87%
Mid level cloud: 76%
High level cloud: 18%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

 7 / 15 mph 58 / 56°F 81% 1011 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
37%
0.1 In
Fri 14
Jun		00:00

NE
NE

 3 / 7 mph 55 / 55°F 97% 1008 mb
Low level cloud: 65%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
06:00

WNW
WNW

 3 / 7 mph 55 / 56°F 86% 1013 mb
Low level cloud: 27%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: low
35%
0.0 In
12:00

SSE
SSE

 4 / 9 mph 63 / 64°F 73% 1011 mb
Low level cloud: 82%
Mid level cloud: 23%
High level cloud: 3%
Most Significant Cloud Type: low
90%
0.0 In
18:00

SSW
SSW

 6 / 14 mph 58 / 57°F 95% 1009 mb
Low level cloud: 57%
Mid level cloud: 78%
High level cloud: 99%
Most Significant Cloud Type: low
95%
0.1 In
Sat 15
Jun		00:00

SSE
SSE

 10 / 21 mph 57 / 55°F 96% 1010 mb
Low level cloud: 64%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

WSW
WSW

 9 / 19 mph 51 / 47°F 95% 1005 mb
Low level cloud: 41%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
86%
0.0 In
12:00

S
S

 14 / 30 mph 62 / 62°F 92% 1009 mb
Low level cloud: 88%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

N
N

 11 / 24 mph 56 / 54°F 79% 1011 mb
Low level cloud: 26%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
30%
0.1 In
Sun 16
Jun		00:00

SW
SW

 11 / 23 mph 59 / 59°F 91% 1011 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
06:00

SW
SW

 4 / 9 mph 50 / 49°F 76% 1015 mb
Low level cloud: 93%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 10 / 22 mph 66 / 66°F 62% 1015 mb
Low level cloud: 5%
Mid level cloud: 9%
High level cloud: 42%
Most Significant Cloud Type: medium
24%
0.0 In
18:00

WSW
WSW

 4 / 9 mph 63 / 63°F 76% 1014 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 40%
Most Significant Cloud Type: medium
27%
0.0 In
Mon 17
Jun		00:00

ESE
ESE

 3 / 7 mph 60 / 60°F 86% 1016 mb
Low level cloud: 4%
Mid level cloud: 87%
High level cloud: 14%
Most Significant Cloud Type: medium
98%
0.0 In
06:00

S
S

 4 / 9 mph 55 / 54°F 91% 1015 mb
Low level cloud: 25%
Mid level cloud: 32%
High level cloud: 10%
Most Significant Cloud Type: low
37%
0.0 In
12:00

SE
SE

 3 / 7 mph 69 / 69°F 86% 1010 mb
Low level cloud: 96%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 5 / 11 mph 59 / 58°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 40%
Most Significant Cloud Type: medium
85%
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