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Manchester 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

The forecast for Manchester in the coming two weeks is predicting the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 29°C expected on the afternoon of Thursday 23rd. The mean minimum temperature will be 13°C, dipping to its lowest on the morning of Saturday 25th at 8°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Predictions are Saturday 18th will have the most precipitation with an accumulation of around 26.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		04:00

NNE
NNE

 3 / 5 mph 57 / 58°F 92%
Low level cloud: 93%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 3 / 4 mph 62 / 60°F 90%
Low level cloud: 55%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 5 / 5 mph 67 / 65°F 76%
Low level cloud: 78%
Mid level cloud: 12%
High level cloud: 21%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 7 / 9 mph 71 / 69°F 68%
Low level cloud: 64%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 7 / 10 mph 67 / 67°F 80%
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 13 mph 64 / 64°F 83%
Low level cloud: 97%
Mid level cloud: 61%
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

SSE
SSE

 8 / 12 mph 62 / 62°F 87%
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		01:00

S
S

 5 / 10 mph 56 / 56°F 94%
Low level cloud: 100%
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
04:00

ESE
ESE

 5 / 9 mph 55 / 54°F 99%
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
07:00

ESE
ESE

 8 / 12 mph 54 / 52°F 97%
Low level cloud: 100%
Mid level cloud: 69%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
10:00

ESE
ESE

 7 / 8 mph 58 / 57°F 98%
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

E
E

 5 / 6 mph 61 / 61°F 97%
Low level cloud: 97%
Mid level cloud: 82%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

E
E

 4 / 4 mph 61 / 61°F 97%
Low level cloud: 98%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 2 / 2 mph 60 / 60°F 96%
Low level cloud: 93%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 1 / 1 mph 58 / 58°F 97%
Low level cloud: 87%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

NE
NE

 1 / 2 mph 53 / 53°F 98%
Low level cloud: 87%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 2 / 4 mph 52 / 53°F 98%
Low level cloud: 85%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 3 / 4 mph 58 / 57°F 93%
Low level cloud: 66%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 3 / 4 mph 65 / 65°F 77%
Low level cloud: 99%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 2 / 3 mph 69 / 67°F 74%
Low level cloud: 75%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 1 / 1 mph 74 / 70°F 70%
Low level cloud: 62%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 4 / 8 mph 68 / 65°F 89%
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 4 / 7 mph 61 / 61°F 93%
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

SSW
SSW

 2 / 4 mph 58 / 58°F 94%
Low level cloud: 10%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 56 / 56°F 95%
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 3 / 4 mph 60 / 60°F 93%
Low level cloud: 74%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 4 / 4 mph 68 / 66°F 81%
Low level cloud: 78%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 4 / 4 mph 76 / 76°F 71%
Low level cloud: 72%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 2 / 2 mph 79 / 78°F 65%
Low level cloud: 40%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 4 / 6 mph 75 / 76°F 85%
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
22:00

SSE
SSE

 4 / 9 mph 63 / 63°F 91%
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
Tue 21
May		01:00

S
S

 4 / 9 mph 60 / 60°F 94%
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
04:00

S
S

 3 / 6 mph 57 / 57°F 95%
Low level cloud: 16%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 4 / 5 mph 64 / 62°F 87%
Low level cloud: 17%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 6 / 7 mph 75 / 76°F 71%
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 8 / 9 mph 79 / 79°F 63%
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 7 / 10 mph 80 / 80°F 64%
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 12 mph 73 / 76°F 84%
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
22:00

S
S

 5 / 11 mph 62 / 62°F 92%
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
Wed 22
May		01:00

S
S

 4 / 9 mph 60 / 60°F 94%
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
04:00

S
S

 4 / 8 mph 57 / 58°F 93%
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
07:00

S
S

 5 / 7 mph 65 / 63°F 80%
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

SSW
SSW

 9 / 10 mph 76 / 77°F 69%
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 11 / 12 mph 81 / 82°F 63%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 8 / 11 mph 83 / 84°F 67%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 56%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 17 mph 69 / 67°F 90%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

ESE
ESE

 9 / 16 mph 63 / 64°F 97%
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
85%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Thu 23
May		01:00

SSE
SSE

 5 / 11 mph 63 / 63°F 95%
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 8 mph 61 / 61°F 97%
Low level cloud: 42%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 8 / 11 mph 69 / 67°F 94%
Low level cloud: 65%
Mid level cloud: 6%
High level cloud: 52%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 9 / 11 mph 80 / 81°F 76%
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 12 / 15 mph 84 / 86°F 67%
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 14 / 20 mph 80 / 82°F 70%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 35%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 6 / 13 mph 75 / 76°F 79%
Low level cloud: 9%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 8 / 16 mph 65 / 65°F 81%
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		01:00

NNW
NNW

 6 / 13 mph 58 / 57°F 73%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
07:00

WNW
WNW

 10 / 14 mph 62 / 62°F 79%
Low level cloud: 2%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.0 In
13:00

SSW
SSW

 9 / 15 mph 81 / 82°F 52%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 6 / 10 mph 72 / 76°F 74%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May		01:00

NE
NE

 3 / 7 mph 65 / 65°F 93%
Low level cloud: 5%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
07:00

WNW
WNW

 12 / 24 mph 53 / 49°F 73%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

ESE
ESE

 6 / 13 mph 71 / 71°F 68%
Low level cloud: 90%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
19:00

SSE
SSE

 5 / 10 mph 69 / 69°F 79%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 16%
Most Significant Cloud Type: medium
11%
0.0 In
Sun 26
May		01:00

SSE
SSE

 7 / 15 mph 52 / 50°F 95%
Low level cloud: 53%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
07:00

S
S

 4 / 9 mph 66 / 66°F 90%
Low level cloud: 5%
Mid level cloud: 91%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
0.1 In
13:00

S
S

 10 / 21 mph 66 / 66°F 90%
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NE
NE

 2 / 4 mph 77 / 82°F 83%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 22%
Most Significant Cloud Type: medium
27%
0.0 In
Mon 27
May		01:00

SE
SE

 2 / 3 mph 66 / 66°F 96%
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 38%
Most Significant Cloud Type: low
46%
0.1 In
07:00

SSW
SSW

 13 / 26 mph 67 / 67°F 94%
Low level cloud: 39%
Mid level cloud: 33%
High level cloud: 3%
Most Significant Cloud Type: low
50%
0.1 In
13:00

ESE
ESE

 1 / 3 mph 82 / 86°F 67%
Low level cloud: 46%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
19:00

WSW
WSW

 4 / 8 mph 74 / 78°F 89%
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 86%
Most Significant Cloud Type: medium
64%
0.1 In
Tue 28
May		01:00

N
N

 2 / 5 mph 67 / 67°F 97%
Low level cloud: 74%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.4 In
07:00

SW
SW

 4 / 8 mph 69 / 69°F 95%
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.6 In
13:00

NE
NE

 8 / 17 mph 67 / 67°F 91%
Low level cloud: 85%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNW
NNW

 13 / 27 mph 65 / 65°F 82%
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.2 In
Wed 29
May		01:00

ESE
ESE

 7 / 15 mph 63 / 63°F 98%
Low level cloud: 97%
Mid level cloud: 96%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 9 / 19 mph 61 / 61°F 85%
Low level cloud: 53%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
13:00

ESE
ESE

 7 / 15 mph 64 / 64°F 95%
Low level cloud: 98%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SE
SE

 4 / 9 mph 69 / 69°F 83%
Low level cloud: 4%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
0.0 In
Thu 30
May		01:00

WSW
WSW

 1 / 2 mph 62 / 62°F 93%
Low level cloud: 87%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
07:00

SSE
SSE

 8 / 16 mph 62 / 62°F 91%
Low level cloud: 35%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
13:00

WSW
WSW

 7 / 14 mph 76 / 78°F 56%
Low level cloud: 49%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
19:00

SE
SE

 15 / 32 mph 61 / 61°F 82%
Low level cloud: 15%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Fri 31
May		01:00

SW
SW

 2 / 5 mph 67 / 67°F 90%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: medium
20%
0.0 In
07:00

ENE
ENE

 4 / 9 mph 57 / 57°F 98%
Low level cloud: 100%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
13:00

SSE
SSE

 6 / 12 mph 78 / 81°F 61%
Low level cloud: 4%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
0.0 In
19:00

WSW
WSW

 11 / 23 mph 59 / 57°F 82%
Low level cloud: 21%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.1 In
Sat 01
Jun		01:00

SE
SE

 7 / 15 mph 63 / 63°F 97%
Low level cloud: 56%
Mid level cloud: 100%
High level cloud: 10%
Most Significant Cloud Type: low
92%
0.4 In
07:00

W
W

 14 / 30 mph 56 / 53°F 78%
Low level cloud: 92%
Mid level cloud: 37%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 9 / 19 mph 72 / 77°F 84%
Low level cloud: 69%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.1 In
19:00

WNW
WNW

 11 / 23 mph 61 / 61°F 65%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: medium
16%
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