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Mount Jackson 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Mount Jackson

Virginia, United States Of America

Long range weather outlook for Mount Jackson includes 14 day forecast summary:

Taking a look at Mount Jackson over the coming two weeks and the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 31°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 25th at 5°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Saturday 18th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		01:00

SW
SW

 1 / 2 mph 51 / 51°F 91% 1012 mb
Low level cloud: 1%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 0 / 1 mph 51 / 51°F 95% 1013 mb
Low level cloud: 18%
Mid level cloud: 32%
High level cloud: 4%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 1 / 1 mph 64 / 62°F 91% 1014 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 3 / 3 mph 73 / 70°F 75% 1014 mb
Low level cloud: 41%
Mid level cloud: 45%
High level cloud: 97%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 2 / 3 mph 74 / 76°F 82% 1013 mb
Low level cloud: 41%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 3 / 5 mph 69 / 66°F 94% 1013 mb
Low level cloud: 25%
Mid level cloud: 49%
High level cloud: 67%
Most Significant Cloud Type: low
50%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
19:00

ESE
ESE

 2 / 3 mph 68 / 65°F 97% 1013 mb
Low level cloud: 43%
Mid level cloud: 50%
High level cloud: 19%
Most Significant Cloud Type: low
63%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

 2 / 3 mph 63 / 63°F 99% 1014 mb
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 18
May		19:00

E
E

 3 / 4 mph 62 / 62°F 98% 1014 mb
Low level cloud: 96%
Mid level cloud: 28%
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

E
E

 3 / 3 mph 61 / 61°F 99% 1015 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 74%
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

E
E

 2 / 3 mph 58 / 60°F 99% 1015 mb
Low level cloud: 99%
Mid level cloud: 63%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 3 / 4 mph 58 / 58°F 99% 1015 mb
Low level cloud: 98%
Mid level cloud: 52%
High level cloud: 33%
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 58 / 58°F 99% 1017 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 2 / 3 mph 60 / 60°F 95% 1017 mb
Low level cloud: 90%
Mid level cloud: 54%
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

ENE
ENE

 2 / 3 mph 65 / 65°F 85% 1017 mb
Low level cloud: 88%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 3 / 3 mph 71 / 70°F 69% 1015 mb
Low level cloud: 86%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 4 / 7 mph 65 / 63°F 83% 1016 mb
Low level cloud: 75%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 1 / 2 mph 54 / 55°F 88% 1017 mb
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

W
W

 2 / 4 mph 51 / 52°F 91% 1016 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 1 / 2 mph 49 / 49°F 93% 1017 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

WNW
WNW

 1 / 2 mph 64 / 62°F 84% 1018 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 4 / 4 mph 76 / 77°F 62% 1017 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 3 / 4 mph 80 / 78°F 53% 1016 mb
Low level cloud: 6%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 6 / 7 mph 79 / 78°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 3 / 7 mph 66 / 64°F 80% 1015 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
22:00

SSW
SSW

 4 / 8 mph 55 / 55°F 92% 1016 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
Tue 21
May		01:00

SW
SW

 4 / 9 mph 52 / 51°F 94% 1016 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
04:00

SW
SW

 5 / 10 mph 51 / 49°F 96% 1016 mb
Low level cloud: 1%
Mid level cloud: 8%
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

SSW
SSW

 5 / 6 mph 66 / 63°F 84% 1017 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 6 mph 79 / 79°F 60% 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
13:00

S
S

 4 / 5 mph 86 / 84°F 49% 1014 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
16:00

SSW
SSW

 4 / 5 mph 87 / 85°F 47% 1013 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
19:00

S
S

 5 / 10 mph 69 / 66°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 8%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 4 / 9 mph 59 / 59°F 85% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SSW
SSW

 6 / 13 mph 56 / 55°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 24%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 6 / 14 mph 55 / 54°F 94% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 42%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 7 / 9 mph 71 / 68°F 81% 1015 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
10:00

SSW
SSW

 6 / 7 mph 85 / 85°F 57% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 10 / 12 mph 88 / 90°F 50% 1012 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 3%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 10 / 13 mph 86 / 87°F 55% 1011 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 6 / 13 mph 74 / 76°F 73% 1010 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 43%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 7 / 14 mph 66 / 66°F 77% 1011 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SW
SW

 8 / 17 mph 63 / 63°F 84% 1011 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
04:00

SW
SW

 7 / 15 mph 60 / 60°F 90% 1010 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 57%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 4 / 6 mph 68 / 67°F 89% 1011 mb
Low level cloud: 92%
Mid level cloud: 15%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 5 / 6 mph 74 / 76°F 90% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 6 / 7 mph 81 / 80°F 67% 1010 mb
Low level cloud: 44%
Mid level cloud: 67%
High level cloud: 18%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 12 / 15 mph 79 / 79°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 6 / 12 mph 65 / 62°F 59% 1013 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
22:00

NW
NW

 5 / 10 mph 56 / 56°F 63% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
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

NNW
NNW

 4 / 8 mph 52 / 51°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
0.0 In
07:00

W
W

 3 / 6 mph 65 / 65°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

SSW
SSW

 9 / 20 mph 83 / 83°F 41% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

SSE
SSE

 3 / 6 mph 69 / 69°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 37%
Most Significant Cloud Type: medium
27%
0.0 In
Sat 25
May		01:00

WNW
WNW

 2 / 4 mph 57 / 57°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

WNW
WNW

 3 / 5 mph 64 / 64°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
13:00

NNW
NNW

 4 / 9 mph 80 / 79°F 33% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

ENE
ENE

 2 / 4 mph 57 / 57°F 66% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Sun 26
May		01:00

SSW
SSW

 6 / 13 mph 50 / 47°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

SSW
SSW

 6 / 12 mph 55 / 54°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 8%
Most Significant Cloud Type: high
8%
0.0 In
13:00

SW
SW

 8 / 17 mph 83 / 85°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 91%
High level cloud: 74%
Most Significant Cloud Type: medium
94%
0.0 In
19:00

S
S

 4 / 9 mph 64 / 64°F 76% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 63%
Most Significant Cloud Type: medium
26%
0.0 In
Mon 27
May		01:00

SW
SW

 7 / 14 mph 57 / 56°F 96% 1019 mb
Low level cloud: 5%
Mid level cloud: 35%
High level cloud: 67%
Most Significant Cloud Type: medium
49%
0.1 In
07:00

SSW
SSW

 8 / 17 mph 67 / 67°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
0.0 In
13:00

SSW
SSW

 10 / 22 mph 84 / 88°F 61% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 48%
Most Significant Cloud Type: medium
45%
0.1 In
19:00

WSW
WSW

 6 / 13 mph 67 / 67°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 19%
Most Significant Cloud Type: medium
33%
0.0 In
Tue 28
May		01:00

SW
SW

 6 / 14 mph 59 / 59°F 89% 1013 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 72%
Most Significant Cloud Type: medium
24%
0.0 In
07:00

WNW
WNW

 2 / 4 mph 71 / 71°F 89% 1014 mb
Low level cloud: 15%
Mid level cloud: 2%
High level cloud: 15%
Most Significant Cloud Type: low
17%
0.0 In
13:00

WSW
WSW

 15 / 30 mph 85 / 87°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 49%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

NNE
NNE

 3 / 6 mph 67 / 67°F 91% 1013 mb
Low level cloud: 9%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
72%
0.2 In
Wed 29
May		01:00

WSW
WSW

 4 / 8 mph 56 / 56°F 91% 1014 mb
Low level cloud: 57%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
07:00

N
N

 4 / 8 mph 65 / 65°F 94% 1014 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
61%
0.2 In
13:00

WNW
WNW

 15 / 32 mph 82 / 82°F 39% 1015 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

NE
NE

 3 / 7 mph 61 / 61°F 99% 1012 mb
Low level cloud: 71%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Thu 30
May		01:00

WSW
WSW

 4 / 9 mph 55 / 55°F 87% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

WSW
WSW

 2 / 3 mph 64 / 64°F 92% 1012 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 81%
Most Significant Cloud Type: low
56%
0.2 In
13:00

E
E

 3 / 7 mph 80 / 82°F 59% 1015 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

SSW
SSW

 6 / 13 mph 61 / 61°F 91% 1009 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
26%
0.2 In
Fri 31
May		01:00

NE
NE

 5 / 10 mph 60 / 60°F 99% 1018 mb
Low level cloud: 97%
Mid level cloud: 82%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.9 In
07:00

WSW
WSW

 5 / 10 mph 60 / 60°F 91% 1012 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.1 In
13:00

NE
NE

 8 / 16 mph 73 / 77°F 56% 1021 mb
Low level cloud: 50%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.1 In
19:00

WSW
WSW

 6 / 13 mph 58 / 58°F 84% 1011 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
Sat 01
Jun		01:00

SSE
SSE

 3 / 5 mph 56 / 57°F 86% 1022 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: medium
54%
0.0 In
07:00

SW
SW

 4 / 9 mph 52 / 51°F 83% 1015 mb
Low level cloud: 38%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
13:00

S
S

 10 / 20 mph 72 / 76°F 53% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 42%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

W
W

 4 / 9 mph 54 / 54°F 74% 1015 mb
Low level cloud: 7%
Mid level cloud: 22%
High level cloud: 3%
Most Significant Cloud Type: medium
41%
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