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Berwick 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

For Berwick in the coming two weeks the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 30°C expected on the afternoon of Wednesday 22nd. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Saturday 25th at 2°C. The next 14 days will 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 13.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
16:00

SSE
SSE

8 / 9 mph 71 / 68°F 70% 1013 mb
Low level cloud: 61%
Mid level cloud: 16%
High level cloud: 52%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

5 / 8 mph 64 / 61°F 89% 1014 mb
Low level cloud: 54%
Mid level cloud: 22%
High level cloud: 18%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

3 / 5 mph 60 / 60°F 89% 1014 mb
Low level cloud: 66%
Mid level cloud: 93%
High level cloud: 33%
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

3 / 5 mph 58 / 58°F 93% 1014 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

3 / 4 mph 57 / 58°F 98% 1014 mb
Low level cloud: 99%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SE
SE

4 / 6 mph 57 / 56°F 98% 1015 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
10:00

SSE
SSE

3 / 3 mph 58 / 59°F 98% 1016 mb
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SSE
SSE

2 / 3 mph 60 / 60°F 95% 1016 mb
Low level cloud: 95%
Mid level cloud: 80%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

2 / 2 mph 60 / 60°F 93% 1016 mb
Low level cloud: 87%
Mid level cloud: 51%
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

SSW
SSW

2 / 3 mph 60 / 59°F 91% 1016 mb
Low level cloud: 94%
Mid level cloud: 42%
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

SSW
SSW

1 / 1 mph 58 / 58°F 94% 1016 mb
Low level cloud: 85%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
01:00

SSE
SSE

0 / 0 mph 56 / 56°F 95% 1016 mb
Low level cloud: 81%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

2 / 3 mph 55 / 55°F 95% 1016 mb
Low level cloud: 67%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

0 / 0 mph 59 / 59°F 92% 1017 mb
Low level cloud: 94%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

1 / 2 mph 67 / 65°F 76% 1017 mb
Low level cloud: 75%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

2 / 2 mph 74 / 76°F 62% 1015 mb
Low level cloud: 84%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

2 / 2 mph 72 / 76°F 72% 1015 mb
Low level cloud: 21%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

1 / 3 mph 65 / 62°F 85% 1015 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

2 / 4 mph 54 / 54°F 92% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
01:00

E
E

2 / 5 mph 52 / 53°F 96% 1017 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

2 / 5 mph 51 / 51°F 97% 1017 mb
Low level cloud: 27%
Mid level cloud: 7%
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

S
S

1 / 1 mph 66 / 62°F 88% 1018 mb
Low level cloud: 42%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

3 / 3 mph 78 / 77°F 65% 1017 mb
Low level cloud: 53%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

4 / 4 mph 81 / 79°F 56% 1016 mb
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

6 / 7 mph 80 / 78°F 64% 1016 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

4 / 9 mph 66 / 63°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

2 / 4 mph 57 / 57°F 96% 1016 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
01:00

SSW
SSW

3 / 6 mph 55 / 55°F 96% 1016 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

2 / 4 mph 53 / 54°F 96% 1016 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

2 / 3 mph 66 / 64°F 85% 1016 mb
Low level cloud: 5%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

6 / 7 mph 78 / 78°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

7 / 8 mph 83 / 81°F 47% 1014 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
16:00

SW
SW

8 / 9 mph 83 / 82°F 54% 1013 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 16%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

5 / 11 mph 69 / 66°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 27%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

3 / 7 mph 60 / 60°F 95% 1014 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
01:00

SSE
SSE

3 / 6 mph 55 / 56°F 93% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 11%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

3 / 6 mph 53 / 53°F 96% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 15%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

3 / 4 mph 69 / 66°F 79% 1015 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

7 / 8 mph 80 / 80°F 59% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

11 / 12 mph 86 / 86°F 54% 1011 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

8 / 15 mph 77 / 78°F 85% 1011 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SW
SW

8 / 17 mph 65 / 64°F 91% 1011 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
22:00

SSE
SSE

4 / 8 mph 61 / 61°F 97% 1011 mb
Low level cloud: 4%
Mid level cloud: 47%
High level cloud: 34%
Most Significant Cloud Type: medium
59%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Thu 23
May
01:00

S
S

3 / 7 mph 61 / 61°F 98% 1009 mb
Low level cloud: 43%
Mid level cloud: 15%
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

S
S

2 / 4 mph 60 / 60°F 98% 1008 mb
Low level cloud: 52%
Mid level cloud: 36%
High level cloud: 91%
Most Significant Cloud Type: low
75%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SSW
SSW

4 / 7 mph 68 / 66°F 97% 1008 mb
Low level cloud: 59%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SW
SW

10 / 12 mph 77 / 78°F 80% 1007 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 31%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

13 / 16 mph 75 / 79°F 83% 1005 mb
Low level cloud: 92%
Mid level cloud: 43%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

13 / 20 mph 72 / 70°F 90% 1006 mb
Low level cloud: 17%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: low
24%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

WNW
WNW

12 / 17 mph 61 / 60°F 73% 1009 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

11 / 14 mph 52 / 48°F 70% 1013 mb
Low level cloud: 15%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
01:00

WNW
WNW

2 / 3 mph 51 / 51°F 87% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
07:00

WNW
WNW

9 / 13 mph 59 / 57°F 84% 1012 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
13:00

WSW
WSW

7 / 10 mph 83 / 83°F 40% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

S
S

5 / 10 mph 64 / 64°F 77% 1015 mb
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

4 / 8 mph 52 / 52°F 96% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
07:00

NW
NW

9 / 18 mph 53 / 50°F 63% 1015 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
13:00

NW
NW

9 / 19 mph 69 / 69°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
19:00

NNE
NNE

4 / 8 mph 53 / 52°F 69% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 26
May
01:00

NE
NE

4 / 9 mph 46 / 44°F 70% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 92%
Most Significant Cloud Type: medium
50%
0.0 In
07:00

S
S

1 / 2 mph 59 / 58°F 63% 1026 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

SSW
SSW

10 / 20 mph 70 / 69°F 53% 1020 mb
Low level cloud: 45%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
81%
0.0 In
19:00

SSE
SSE

6 / 12 mph 60 / 60°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 100%
Most Significant Cloud Type: medium
45%
0.0 In
Mon 27
May
01:00

SE
SE

4 / 8 mph 55 / 55°F 96% 1017 mb
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 61%
Most Significant Cloud Type: low
100%
0.2 In
07:00

SSW
SSW

4 / 9 mph 67 / 67°F 81% 1017 mb
Low level cloud: 10%
Mid level cloud: 20%
High level cloud: 13%
Most Significant Cloud Type: low
18%
0.0 In
13:00

SSW
SSW

9 / 19 mph 75 / 79°F 79% 1012 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
19:00

WSW
WSW

6 / 12 mph 65 / 65°F 96% 1011 mb
Low level cloud: 52%
Mid level cloud: 61%
High level cloud: 58%
Most Significant Cloud Type: low
80%
0.2 In
Tue 28
May
01:00

WSW
WSW

4 / 9 mph 61 / 61°F 99% 1012 mb
Low level cloud: 68%
Mid level cloud: 22%
High level cloud: 6%
Most Significant Cloud Type: low
76%
0.5 In
07:00

NW
NW

6 / 13 mph 66 / 66°F 94% 1013 mb
Low level cloud: 56%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.5 In
13:00

NNW
NNW

2 / 5 mph 63 / 63°F 97% 1014 mb
Low level cloud: 79%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NNW
NNW

2 / 4 mph 72 / 76°F 73% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 83%
Most Significant Cloud Type: medium
18%
0.0 In
Wed 29
May
01:00

N
N

2 / 4 mph 49 / 50°F 95% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
07:00

NNE
NNE

2 / 4 mph 68 / 68°F 82% 1014 mb
Low level cloud: 15%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
30%
0.0 In
13:00

N
N

3 / 6 mph 73 / 76°F 41% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
19:00

SSE
SSE

2 / 5 mph 65 / 65°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
Thu 30
May
01:00

ENE
ENE

3 / 6 mph 50 / 50°F 93% 1018 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: medium
30%
0.0 In
07:00

ENE
ENE

2 / 4 mph 66 / 66°F 82% 1012 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: medium
75%
0.0 In
13:00

NNW
NNW

1 / 3 mph 68 / 68°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 93%
Most Significant Cloud Type: medium
63%
0.1 In
19:00

SSW
SSW

6 / 12 mph 60 / 60°F 95% 1009 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: medium
81%
0.3 In
Fri 31
May
01:00

NW
NW

2 / 4 mph 55 / 55°F 95% 1018 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 47%
Most Significant Cloud Type: medium
25%
0.1 In
07:00

W
W

3 / 6 mph 62 / 62°F 93% 1010 mb
Low level cloud: 46%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.2 In
13:00

NE
NE

10 / 21 mph 76 / 78°F 53% 1018 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 41%
Most Significant Cloud Type: medium
47%
0.0 In
19:00

SW
SW

4 / 9 mph 58 / 58°F 96% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 34%
Most Significant Cloud Type: medium
48%
0.1 In
Sat 01
Jun
01:00

NNW
NNW

4 / 8 mph 54 / 53°F 97% 1022 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 3%
Most Significant Cloud Type: medium
18%
0.2 In
07:00

W
W

6 / 13 mph 54 / 52°F 92% 1011 mb
Low level cloud: 45%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.1 In
13:00

ENE
ENE

9 / 18 mph 65 / 65°F 65% 1023 mb
Low level cloud: 88%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

WNW
WNW

8 / 16 mph 56 / 55°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 8%
Most Significant Cloud Type: medium
18%
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