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Bedford 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

Reviewing the forecast for Bedford Over the next 14 days and the average daytime maximum temperature will be around 1°C, with a high for the two weeks of 6°C expected on the afternoon of Saturday 18th. The mean minimum temperature will be -5°C, dipping to its lowest on the morning of Monday 20th at -10°C. The next 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. Predictions are Sunday 19th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 10
Jan		01:00

NW
NW

 13 / 20 mph 25 / 13°F 55% 1006 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 13 / 19 mph 25 / 14°F 56% 1007 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
07:00

NW
NW

 10 / 16 mph 26 / 16°F 58% 1008 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
10:00

NW
NW

 11 / 14 mph 30 / 21°F 52% 1010 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
13:00

NW
NW

 12 / 14 mph 36 / 28°F 44% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 7 / 12 mph 34 / 28°F 53% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 26%
Most Significant Cloud Type: high
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 3 / 6 mph 30 / 27°F 66% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 26%
Most Significant Cloud Type: high
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 4 / 6 mph 29 / 25°F 66% 1008 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 72%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
Jan		19:00

NNW
NNW

 8 / 9 mph 31 / 24°F 92% 1001 mb
Low level cloud: 73%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 7 / 9 mph 30 / 23°F 84% 1003 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 12
Jan		01:00

NW
NW

 8 / 11 mph 27 / 19°F 74% 1005 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 8%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 8 / 12 mph 26 / 18°F 71% 1008 mb
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 5 / 8 mph 26 / 19°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 5 / 6 mph 31 / 26°F 60% 1014 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
13:00

NW
NW

 4 / 5 mph 36 / 33°F 52% 1014 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
16:00

SW
SW

 2 / 2 mph 36 / 36°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 2 / 3 mph 27 / 27°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 2 / 3 mph 27 / 27°F 85% 1017 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
Mon 13
Jan		01:00

SSW
SSW

 3 / 6 mph 27 / 24°F 84% 1016 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
04:00

SW
SW

 3 / 5 mph 27 / 24°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 3 / 7 mph 26 / 21°F 86% 1016 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

WSW
WSW

 4 / 6 mph 33 / 29°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 4 / 5 mph 39 / 36°F 50% 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
16:00

W
W

 3 / 6 mph 35 / 33°F 69% 1012 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 5 / 10 mph 30 / 25°F 80% 1013 mb
Low level cloud: 29%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 6 / 11 mph 29 / 23°F 78% 1013 mb
Low level cloud: 2%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 14
Jan		01:00

W
W

 7 / 12 mph 29 / 22°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 8 / 12 mph 29 / 21°F 70% 1013 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
07:00

W
W

 9 / 12 mph 28 / 19°F 67% 1013 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
10:00

WNW
WNW

 11 / 14 mph 29 / 19°F 51% 1013 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
13:00

WNW
WNW

 12 / 14 mph 31 / 22°F 41% 1011 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 11 / 13 mph 29 / 20°F 46% 1011 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 11 / 14 mph 25 / 14°F 48% 1011 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 11 / 14 mph 23 / 11°F 46% 1011 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
Jan		01:00

WNW
WNW

 10 / 13 mph 21 / 10°F 52% 1010 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 10 / 13 mph 20 / 9°F 57% 1011 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 10 / 15 mph 19 / 8°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 12 / 14 mph 24 / 13°F 48% 1013 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 11 / 13 mph 30 / 21°F 37% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 10 / 13 mph 30 / 22°F 47% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 10 / 12 mph 28 / 18°F 56% 1016 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

NW
NW

 9 / 11 mph 26 / 17°F 59% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
Jan		01:00

WNW
WNW

 7 / 9 mph 24 / 16°F 63% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 6 / 8 mph 22 / 14°F 64% 1016 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
07:00

W
W

 5 / 7 mph 21 / 13°F 64% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 6 / 8 mph 24 / 17°F 49% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 94%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 7 / 8 mph 28 / 21°F 43% 1011 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
16:00

SW
SW

 6 / 8 mph 28 / 22°F 51% 1010 mb
Low level cloud: 1%
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
19:00

SW
SW

 6 / 7 mph 27 / 21°F 54% 1010 mb
Low level cloud: 57%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 4 / 6 mph 26 / 21°F 66% 1010 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
Jan		01:00

NNW
NNW

 6 / 6 mph 26 / 19°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

NNW
NNW

 10 / 13 mph 22 / 12°F 58% 1016 mb
Low level cloud: 71%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
13:00

WNW
WNW

 11 / 12 mph 36 / 28°F 39% 1015 mb
Low level cloud: 19%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
20%
0.0 In
19:00

W
W

 5 / 6 mph 35 / 31°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
Sat 18
Jan		01:00

WNW
WNW

 11 / 13 mph 22 / 11°F 49% 1011 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

SW
SW

 10 / 12 mph 33 / 25°F 65% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

SW
SW

 12 / 15 mph 42 / 36°F 48% 1012 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

W
W

 6 / 7 mph 41 / 37°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 19
Jan		01:00

SW
SW

 9 / 18 mph 36 / 29°F 88% 1011 mb
Low level cloud: 92%
Mid level cloud: 70%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 3 / 4 mph 33 / 30°F 71% 1024 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 39%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

W
W

 1 / 1 mph 41 / 41°F 100% 1008 mb
Low level cloud: 100%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
19:00

ENE
ENE

 6 / 8 mph 35 / 30°F 100% 1014 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Mon 20
Jan		01:00

NNW
NNW

 11 / 15 mph 24 / 13°F 95% 1005 mb
Low level cloud: 68%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.4 In
07:00

NNW
NNW

 4 / 5 mph 31 / 27°F 96% 1001 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.4 In
13:00

NW
NW

 11 / 13 mph 16 / 3°F 86% 1011 mb
Low level cloud: 97%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

NW
NW

 9 / 11 mph 35 / 28°F 95% 1005 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
Tue 21
Jan		01:00

SW
SW

 6 / 6 mph 15 / 6°F 83% 1027 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
07:00

WNW
WNW

 16 / 22 mph 7 / -11°F 67% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

WSW
WSW

 9 / 10 mph 23 / 14°F 58% 1035 mb
Low level cloud: 37%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
19:00

W
W

 10 / 12 mph 15 / 3°F 72% 1033 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
6%
0.0 In
Wed 22
Jan		01:00

SW
SW

 11 / 14 mph 21 / 10°F 82% 1035 mb
Low level cloud: 63%
Mid level cloud: 99%
High level cloud: 64%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

 6 / 7 mph 16 / 8°F 82% 1038 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
0.0 In
13:00

WSW
WSW

 5 / 6 mph 31 / 26°F 84% 1029 mb
Low level cloud: 77%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

WSW
WSW

 4 / 4 mph 22 / 17°F 77% 1038 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 23
Jan		01:00

NW
NW

 7 / 9 mph 22 / 13°F 82% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NNW
NNW

 3 / 4 mph 17 / 13°F 80% 1037 mb
Low level cloud: 0%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
98%
0.0 In
13:00

WNW
WNW

 12 / 14 mph 25 / 14°F 56% 1026 mb
Low level cloud: 33%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
19:00

NNW
NNW

 6 / 8 mph 21 / 12°F 93% 1031 mb
Low level cloud: 54%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
Fri 24
Jan		01:00

WSW
WSW

 10 / 13 mph 18 / 7°F 79% 1027 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 22%
Most Significant Cloud Type: medium
31%
0.0 In
07:00

NNW
NNW

 5 / 6 mph 20 / 13°F 95% 1028 mb
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.1 In
13:00

SW
SW

 11 / 13 mph 32 / 23°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

W
W

 3 / 3 mph 28 / 26°F 96% 1028 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
4%
0.0 In
Sat 25
Jan		01:00

SW
SW

 10 / 15 mph 30 / 21°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WSW
WSW

 2 / 3 mph 21 / 19°F 89% 1026 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

WSW
WSW

 10 / 13 mph 39 / 32°F 77% 1019 mb
Low level cloud: 32%
Mid level cloud: 93%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

W
W

 5 / 5 mph 30 / 25°F 92% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
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