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Mifflinburg 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

The next 14 day outlook for Mifflinburg shows 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 Wednesday 22nd. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Saturday 25th at 6°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Wednesday 22nd will have the most precipitation with an accumulation of around 22.0mm. On the whole winds are likely to be light.

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

ENE
ENE

 2 / 5 mph 51 / 51°F 96%
Low level cloud: 34%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 2 / 2 mph 59 / 59°F 89%
Low level cloud: 63%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 5 / 6 mph 68 / 67°F 71%
Low level cloud: 76%
Mid level cloud: 13%
High level cloud: 20%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 9 / 11 mph 71 / 71°F 63%
Low level cloud: 91%
Mid level cloud: 15%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 10 / 12 mph 68 / 67°F 77%
Low level cloud: 78%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 8 mph 60 / 60°F 95%
Low level cloud: 100%
Mid level cloud: 99%
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

 5 / 8 mph 60 / 60°F 97%
Low level cloud: 99%
Mid level cloud: 99%
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

S
S

 5 / 9 mph 57 / 56°F 98%
Low level cloud: 99%
Mid level cloud: 96%
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

SSE
SSE

 4 / 8 mph 56 / 55°F 99%
Low level cloud: 98%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
07:00

SSE
SSE

 5 / 9 mph 55 / 54°F 99%
Low level cloud: 99%
Mid level cloud: 70%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
10:00

SSE
SSE

 4 / 5 mph 58 / 57°F 97%
Low level cloud: 98%
Mid level cloud: 66%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SSE
SSE

 3 / 4 mph 60 / 59°F 96%
Low level cloud: 91%
Mid level cloud: 54%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 4 / 4 mph 60 / 60°F 91%
Low level cloud: 91%
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
19:00

S
S

 3 / 3 mph 59 / 60°F 93%
Low level cloud: 96%
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
22:00

S
S

 2 / 2 mph 58 / 58°F 95%
Low level cloud: 96%
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

SSE
SSE

 1 / 2 mph 55 / 55°F 95%
Low level cloud: 95%
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
04:00

SSW
SSW

 1 / 2 mph 54 / 54°F 95%
Low level cloud: 81%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 1 / 1 mph 61 / 59°F 88%
Low level cloud: 66%
Mid level cloud: 16%
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

SE
SE

 2 / 2 mph 73 / 69°F 69%
Low level cloud: 39%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 3 / 4 mph 77 / 77°F 61%
Low level cloud: 33%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 3 / 4 mph 78 / 78°F 61%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 3 / 7 mph 67 / 64°F 87%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 3 / 7 mph 58 / 59°F 94%
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
Mon 20
May		01:00

SW
SW

 1 / 2 mph 56 / 56°F 95%
Low level cloud: 8%
Mid level cloud: 12%
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

SSW
SSW

 2 / 3 mph 54 / 54°F 97%
Low level cloud: 25%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 1 / 2 mph 66 / 62°F 90%
Low level cloud: 43%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 4 mph 77 / 77°F 69%
Low level cloud: 25%
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

SE
SE

 6 / 7 mph 81 / 80°F 59%
Low level cloud: 2%
Mid level cloud: 10%
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

SSE
SSE

 6 / 7 mph 82 / 80°F 60%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 4 / 9 mph 69 / 67°F 88%
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
22:00

SSW
SSW

 2 / 5 mph 61 / 61°F 94%
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
Tue 21
May		01:00

SSW
SSW

 3 / 6 mph 59 / 59°F 96%
Low level cloud: 17%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 3 / 7 mph 57 / 57°F 97%
Low level cloud: 17%
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

S
S

 3 / 4 mph 67 / 64°F 89%
Low level cloud: 28%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 6 / 7 mph 78 / 78°F 65%
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

S
S

 8 / 10 mph 83 / 82°F 53%
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
16:00

S
S

 10 / 11 mph 83 / 83°F 58%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 7 / 14 mph 72 / 69°F 82%
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
22:00

S
S

 4 / 9 mph 62 / 62°F 95%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SSE
SSE

 3 / 6 mph 59 / 60°F 96%
Low level cloud: 8%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 56 / 57°F 97%
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 4 / 4 mph 66 / 64°F 88%
Low level cloud: 31%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 8 / 9 mph 78 / 78°F 64%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 2%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 10 / 12 mph 85 / 85°F 56%
Low level cloud: 7%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 12 / 18 mph 81 / 83°F 72%
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 6 / 11 mph 73 / 69°F 93%
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 68%
Most Significant Cloud Type: low
54%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

SE
SE

 2 / 4 mph 64 / 64°F 98%
Low level cloud: 24%
Mid level cloud: 15%
High level cloud: 85%
Most Significant Cloud Type: low
39%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
Thu 23
May		01:00

SSW
SSW

 3 / 6 mph 61 / 62°F 98%
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 17%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 59 / 60°F 99%
Low level cloud: 80%
Mid level cloud: 11%
High level cloud: 74%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 6 mph 65 / 65°F 97%
Low level cloud: 97%
Mid level cloud: 17%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 8 / 10 mph 74 / 77°F 84%
Low level cloud: 67%
Mid level cloud: 27%
High level cloud: 10%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 15 / 19 mph 82 / 83°F 71%
Low level cloud: 7%
Mid level cloud: 37%
High level cloud: 14%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 14 / 17 mph 80 / 80°F 65%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 44%
Most Significant Cloud Type: high
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 9 / 16 mph 71 / 69°F 70%
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
22:00

WNW
WNW

 10 / 16 mph 62 / 62°F 76%
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
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

WNW
WNW

 4 / 8 mph 53 / 53°F 78%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
07:00

WNW
WNW

 8 / 13 mph 59 / 59°F 74%
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
13:00

S
S

 8 / 13 mph 82 / 83°F 44%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

S
S

 5 / 10 mph 68 / 68°F 76%
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

NNE
NNE

 2 / 5 mph 56 / 57°F 97%
Low level cloud: 36%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.0 In
07:00

WNW
WNW

 8 / 16 mph 53 / 50°F 68%
Low level cloud: 15%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
13:00

SSE
SSE

 8 / 17 mph 75 / 77°F 56%
Low level cloud: 32%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
19:00

SSW
SSW

 4 / 9 mph 62 / 62°F 76%
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 17%
Most Significant Cloud Type: medium
54%
0.0 In
Sun 26
May		01:00

SSE
SSE

 8 / 16 mph 54 / 52°F 93%
Low level cloud: 79%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
81%
0.0 In
07:00

S
S

 5 / 10 mph 63 / 63°F 97%
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.2 In
13:00

S
S

 5 / 10 mph 62 / 62°F 98%
Low level cloud: 99%
Mid level cloud: 11%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SSW
SSW

 4 / 9 mph 70 / 71°F 92%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.2 In
Mon 27
May		01:00

WSW
WSW

 2 / 5 mph 63 / 63°F 99%
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
56%
0.1 In
07:00

S
S

 4 / 8 mph 67 / 67°F 97%
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 41%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSE
SSE

 4 / 9 mph 82 / 84°F 54%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

W
W

 3 / 6 mph 68 / 68°F 90%
Low level cloud: 21%
Mid level cloud: 83%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.1 In
Tue 28
May		01:00

NNE
NNE

 2 / 4 mph 64 / 64°F 97%
Low level cloud: 71%
Mid level cloud: 85%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.6 In
07:00

NW
NW

 2 / 4 mph 66 / 66°F 98%
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ENE
ENE

 5 / 11 mph 64 / 64°F 96%
Low level cloud: 60%
Mid level cloud: 54%
High level cloud: 85%
Most Significant Cloud Type: low
89%
0.1 In
19:00

NNW
NNW

 10 / 21 mph 61 / 61°F 86%
Low level cloud: 62%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: low
69%
0.2 In
Wed 29
May		01:00

NE
NE

 4 / 7 mph 63 / 63°F 99%
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 6 / 12 mph 63 / 63°F 77%
Low level cloud: 94%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SE
SE

 4 / 9 mph 64 / 64°F 98%
Low level cloud: 97%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

N
N

 2 / 4 mph 70 / 70°F 77%
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
Thu 30
May		01:00

S
S

 2 / 4 mph 61 / 61°F 97%
Low level cloud: 33%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
07:00

SE
SE

 2 / 5 mph 63 / 63°F 90%
Low level cloud: 76%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
13:00

W
W

 8 / 16 mph 73 / 77°F 57%
Low level cloud: 35%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.1 In
19:00

SE
SE

 13 / 28 mph 61 / 61°F 91%
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Fri 31
May		01:00

WNW
WNW

 2 / 4 mph 59 / 59°F 94%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

SE
SE

 4 / 7 mph 56 / 56°F 98%
Low level cloud: 100%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.8 In
13:00

SSE
SSE

 7 / 14 mph 78 / 80°F 52%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
0.0 In
19:00

SW
SW

 9 / 19 mph 57 / 55°F 82%
Low level cloud: 67%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
Sat 01
Jun		01:00

ESE
ESE

 4 / 8 mph 63 / 63°F 99%
Low level cloud: 93%
Mid level cloud: 69%
High level cloud: 40%
Most Significant Cloud Type: low
100%
0.5 In
07:00

WSW
WSW

 12 / 25 mph 52 / 48°F 95%
Low level cloud: 91%
Mid level cloud: 70%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SW
SW

 9 / 20 mph 72 / 76°F 88%
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
19:00

WNW
WNW

 7 / 15 mph 57 / 55°F 68%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
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