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Clearfield 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

The forecast for Clearfield 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 31°C expected on the afternoon of Wednesday 22nd. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 25th at 5°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 22nd will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

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

E
E

 4 / 8 mph 51 / 50°F 99%
Low level cloud: 69%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 6 / 7 mph 58 / 56°F 91%
Low level cloud: 72%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 8 / 10 mph 70 / 68°F 65%
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 10 / 14 mph 66 / 65°F 82%
Low level cloud: 55%
Mid level cloud: 49%
High level cloud: 14%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 8 / 12 mph 59 / 58°F 98%
Low level cloud: 99%
Mid level cloud: 73%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

S
S

 5 / 7 mph 59 / 59°F 98%
Low level cloud: 91%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 4 / 6 mph 58 / 58°F 99%
Low level cloud: 90%
Mid level cloud: 78%
High level cloud: 100%
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

SSW
SSW

 4 / 5 mph 58 / 58°F 99%
Low level cloud: 97%
Mid level cloud: 84%
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

S
S

 2 / 3 mph 58 / 59°F 99%
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 2 / 2 mph 60 / 60°F 97%
Low level cloud: 89%
Mid level cloud: 54%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 5 mph 63 / 63°F 92%
Low level cloud: 89%
Mid level cloud: 49%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 3 / 5 mph 65 / 65°F 86%
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SE
SE

 6 / 8 mph 68 / 65°F 81%
Low level cloud: 55%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 6 / 8 mph 63 / 60°F 87%
Low level cloud: 47%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 3 / 6 mph 53 / 53°F 98%
Low level cloud: 54%
Mid level cloud: 18%
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

ESE
ESE

 2 / 4 mph 51 / 52°F 97%
Low level cloud: 61%
Mid level cloud: 29%
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

ESE
ESE

 2 / 5 mph 50 / 51°F 97%
Low level cloud: 63%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 2 / 2 mph 59 / 58°F 88%
Low level cloud: 66%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 2 / 2 mph 74 / 70°F 63%
Low level cloud: 24%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 3 / 3 mph 81 / 79°F 46%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 2 / 3 mph 82 / 79°F 43%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 9 mph 68 / 65°F 79%
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
22:00

ESE
ESE

 2 / 5 mph 57 / 58°F 94%
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

E
E

 1 / 3 mph 55 / 55°F 95%
Low level cloud: 2%
Mid level cloud: 17%
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

ESE
ESE

 2 / 4 mph 53 / 55°F 95%
Low level cloud: 7%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 1 / 1 mph 65 / 62°F 82%
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 4 mph 77 / 77°F 55%
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
13:00

SSE
SSE

 4 / 5 mph 83 / 80°F 43%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 5 / 5 mph 83 / 80°F 48%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 3 / 6 mph 71 / 69°F 74%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 7 mph 64 / 64°F 83%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

S
S

 3 / 6 mph 57 / 58°F 95%
Low level cloud: 8%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 2 / 5 mph 55 / 56°F 96%
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 3 / 4 mph 66 / 64°F 82%
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 7 mph 80 / 78°F 52%
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
13:00

WSW
WSW

 7 / 8 mph 85 / 82°F 39%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 8 / 9 mph 85 / 82°F 41%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 4 / 8 mph 71 / 68°F 77%
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

S
S

 4 / 8 mph 62 / 62°F 92%
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SE
SE

 3 / 6 mph 59 / 59°F 96%
Low level cloud: 24%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 4 / 7 mph 57 / 57°F 97%
Low level cloud: 29%
Mid level cloud: 9%
High level cloud: 11%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 7 mph 68 / 65°F 83%
Low level cloud: 2%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 9 / 11 mph 81 / 81°F 55%
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 12 / 14 mph 87 / 87°F 44%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 21%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 9 / 12 mph 80 / 80°F 68%
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 9 mph 68 / 65°F 96%
Low level cloud: 40%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
57%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

SE
SE

 5 / 10 mph 62 / 62°F 98%
Low level cloud: 62%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SE
SE

 3 / 6 mph 60 / 60°F 99%
Low level cloud: 70%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
74%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSE
SSE

 4 / 9 mph 60 / 60°F 99%
Low level cloud: 82%
Mid level cloud: 17%
High level cloud: 94%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 7 / 10 mph 67 / 65°F 97%
Low level cloud: 54%
Mid level cloud: 20%
High level cloud: 75%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 13 / 17 mph 76 / 77°F 79%
Low level cloud: 35%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 17 / 20 mph 80 / 80°F 55%
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

W
W

 14 / 17 mph 74 / 76°F 63%
Low level cloud: 15%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 13 / 18 mph 64 / 63°F 76%
Low level cloud: 49%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 10 / 15 mph 55 / 52°F 77%
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
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

WSW
WSW

 3 / 7 mph 48 / 47°F 90%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

WNW
WNW

 9 / 18 mph 54 / 51°F 69%
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
13:00

SW
SW

 7 / 15 mph 82 / 81°F 34%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

SSE
SSE

 5 / 11 mph 65 / 65°F 74%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Sat 25
May		01:00

N
N

 2 / 3 mph 53 / 53°F 98%
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 7 / 15 mph 48 / 44°F 74%
Low level cloud: 66%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
13:00

SSE
SSE

 5 / 10 mph 79 / 80°F 47%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

WSW
WSW

 2 / 4 mph 60 / 60°F 87%
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 88%
Most Significant Cloud Type: medium
100%
0.0 In
Sun 26
May		01:00

SSE
SSE

 9 / 19 mph 59 / 59°F 92%
Low level cloud: 76%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
78%
0.0 In
07:00

SW
SW

 7 / 14 mph 62 / 62°F 97%
Low level cloud: 75%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: low
95%
0.3 In
13:00

SW
SW

 6 / 14 mph 69 / 69°F 93%
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 91%
Most Significant Cloud Type: low
96%
0.3 In
19:00

SW
SW

 4 / 9 mph 68 / 68°F 92%
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
Mon 27
May		01:00

W
W

 3 / 6 mph 55 / 56°F 96%
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
07:00

SSW
SSW

 4 / 8 mph 62 / 62°F 99%
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.5 In
13:00

W
W

 5 / 10 mph 77 / 78°F 50%
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 83%
Most Significant Cloud Type: medium
52%
0.0 In
19:00

WNW
WNW

 2 / 5 mph 65 / 65°F 97%
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
72%
0.2 In
Tue 28
May		01:00

N
N

 3 / 7 mph 60 / 60°F 98%
Low level cloud: 90%
Mid level cloud: 79%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.5 In
07:00

NNE
NNE

 7 / 15 mph 58 / 57°F 98%
Low level cloud: 99%
Mid level cloud: 78%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.2 In
13:00

E
E

 7 / 15 mph 61 / 61°F 93%
Low level cloud: 99%
Mid level cloud: 35%
High level cloud: 54%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NNW
NNW

 6 / 13 mph 60 / 60°F 85%
Low level cloud: 38%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.1 In
Wed 29
May		01:00

ENE
ENE

 5 / 10 mph 58 / 58°F 99%
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NNE
NNE

 3 / 6 mph 57 / 58°F 89%
Low level cloud: 28%
Mid level cloud: 9%
High level cloud: 22%
Most Significant Cloud Type: low
33%
0.0 In
13:00

WSW
WSW

 11 / 24 mph 67 / 67°F 79%
Low level cloud: 69%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
72%
0.1 In
19:00

ESE
ESE

 4 / 9 mph 63 / 63°F 76%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Thu 30
May		01:00

WSW
WSW

 4 / 7 mph 51 / 51°F 97%
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
07:00

SE
SE

 10 / 21 mph 61 / 61°F 82%
Low level cloud: 33%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
13:00

WSW
WSW

 9 / 19 mph 67 / 67°F 69%
Low level cloud: 64%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.1 In
19:00

SSE
SSE

 15 / 32 mph 59 / 56°F 97%
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.3 In
Fri 31
May		01:00

SW
SW

 1 / 2 mph 56 / 56°F 96%
Low level cloud: 7%
Mid level cloud: 13%
High level cloud: 52%
Most Significant Cloud Type: low
17%
0.1 In
07:00

SE
SE

 7 / 15 mph 55 / 53°F 97%
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.5 In
13:00

SSW
SSW

 5 / 10 mph 77 / 78°F 39%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

SW
SW

 11 / 22 mph 52 / 48°F 97%
Low level cloud: 98%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sat 01
Jun		01:00

SE
SE

 10 / 21 mph 60 / 60°F 97%
Low level cloud: 85%
Mid level cloud: 89%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.3 In
07:00

W
W

 14 / 29 mph 47 / 42°F 98%
Low level cloud: 100%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
13:00

WSW
WSW

 7 / 15 mph 61 / 61°F 98%
Low level cloud: 96%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

WNW
WNW

 12 / 25 mph 57 / 54°F 64%
Low level cloud: 15%
Mid level cloud: 28%
High level cloud: 4%
Most Significant Cloud Type: low
25%
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