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Waller Mill Reservoir 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Waller Mill Reservoir

Virginia, United States Of America

Long range weather outlook for Waller Mill Reservoir includes 14 day forecast summary:

Over the next 14 days the Waller Mill Reservoir forecast suggests the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 33°C expected on the afternoon of Monday 27th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Monday 20th at 11°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 18th will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be moderate.

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

ENE
ENE

 4 / 7 mph 62 / 62°F 94% 1011 mb
Low level cloud: 16%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 4 / 8 mph 59 / 59°F 96% 1012 mb
Low level cloud: 37%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 7 / 9 mph 67 / 64°F 86% 1013 mb
Low level cloud: 52%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 6 / 7 mph 68 / 68°F 70% 1014 mb
Low level cloud: 97%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 2 / 2 mph 79 / 77°F 58% 1014 mb
Low level cloud: 41%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 5 / 6 mph 73 / 76°F 63% 1014 mb
Low level cloud: 62%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 9 mph 67 / 64°F 81% 1014 mb
Low level cloud: 57%
Mid level cloud: 19%
High level cloud: 3%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 5 / 9 mph 61 / 61°F 92% 1015 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		19:00

E
E

 9 / 10 mph 63 / 63°F 88% 1014 mb
Low level cloud: 95%
Mid level cloud: 44%
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

 8 / 9 mph 62 / 62°F 89% 1015 mb
Low level cloud: 87%
Mid level cloud: 69%
High level cloud: 100%
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

ENE
ENE

 8 / 11 mph 59 / 59°F 91% 1014 mb
Low level cloud: 100%
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
04:00

NE
NE

 8 / 11 mph 58 / 56°F 93% 1014 mb
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
07:00

NE
NE

 8 / 11 mph 58 / 56°F 94% 1016 mb
Low level cloud: 88%
Mid level cloud: 84%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 7 / 11 mph 58 / 57°F 94% 1016 mb
Low level cloud: 58%
Mid level cloud: 82%
High level cloud: 70%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 8 / 9 mph 68 / 66°F 73% 1015 mb
Low level cloud: 63%
Mid level cloud: 32%
High level cloud: 38%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 7 / 9 mph 71 / 68°F 70% 1015 mb
Low level cloud: 60%
Mid level cloud: 30%
High level cloud: 30%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 5 / 7 mph 67 / 64°F 81% 1015 mb
Low level cloud: 40%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 6 / 9 mph 58 / 58°F 94% 1016 mb
Low level cloud: 22%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

NE
NE

 5 / 9 mph 56 / 55°F 95% 1016 mb
Low level cloud: 25%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 6 / 10 mph 55 / 54°F 96% 1016 mb
Low level cloud: 34%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 8 / 10 mph 62 / 60°F 83% 1017 mb
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 11 / 13 mph 72 / 76°F 60% 1018 mb
Low level cloud: 34%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 11 / 12 mph 75 / 77°F 53% 1016 mb
Low level cloud: 2%
Mid level cloud: 7%
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

ENE
ENE

 9 / 10 mph 75 / 77°F 55% 1016 mb
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
19:00

E
E

 6 / 8 mph 68 / 66°F 81% 1017 mb
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

E
E

 5 / 6 mph 62 / 62°F 91% 1017 mb
Low level cloud: 1%
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
Tue 21
May		01:00

ENE
ENE

 3 / 6 mph 57 / 57°F 93% 1016 mb
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
04:00

NNW
NNW

 3 / 6 mph 56 / 56°F 94% 1016 mb
Low level cloud: 10%
Mid level cloud: 2%
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

ENE
ENE

 2 / 3 mph 64 / 62°F 80% 1018 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 4 / 4 mph 76 / 77°F 58% 1017 mb
Low level cloud: 4%
Mid level cloud: 0%
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

ESE
ESE

 8 / 9 mph 80 / 79°F 51% 1016 mb
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
16:00

ESE
ESE

 8 / 9 mph 79 / 79°F 56% 1016 mb
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
19:00

ESE
ESE

 7 / 11 mph 69 / 67°F 76% 1016 mb
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

SSE
SSE

 6 / 9 mph 65 / 65°F 87% 1016 mb
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
Wed 22
May		01:00

SSW
SSW

 5 / 9 mph 60 / 60°F 92% 1016 mb
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
04:00

SSW
SSW

 5 / 10 mph 58 / 57°F 94% 1017 mb
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
07:00

SSW
SSW

 6 / 7 mph 67 / 65°F 80% 1017 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 7 mph 80 / 79°F 57% 1017 mb
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
13:00

SSW
SSW

 7 / 8 mph 87 / 85°F 46% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 9 / 11 mph 86 / 85°F 46% 1014 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
19:00

S
S

 7 / 14 mph 78 / 78°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 15%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 10 / 18 mph 70 / 70°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 72%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SSW
SSW

 9 / 15 mph 68 / 68°F 82% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 84%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 9 / 15 mph 66 / 66°F 89% 1012 mb
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 10 / 14 mph 72 / 76°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 16%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 10 / 13 mph 82 / 82°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 7 / 9 mph 89 / 89°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 9 / 13 mph 85 / 87°F 56% 1009 mb
Low level cloud: 7%
Mid level cloud: 67%
High level cloud: 6%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 7 / 14 mph 78 / 79°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 48%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 5 / 9 mph 69 / 69°F 94% 1012 mb
Low level cloud: 18%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: low
24%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		01:00

N
N

 6 / 13 mph 64 / 64°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 98%
Most Significant Cloud Type: medium
27%
0.0 In
07:00

W
W

 5 / 6 mph 70 / 70°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

 5 / 10 mph 85 / 85°F 38% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SE
SE

 7 / 15 mph 70 / 70°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: medium
22%
0.0 In
Sat 25
May		01:00

SW
SW

 7 / 14 mph 66 / 66°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NNE
NNE

 6 / 12 mph 67 / 67°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

N
N

 6 / 12 mph 80 / 80°F 42% 1017 mb
Low level cloud: 5%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
19:00

E
E

 6 / 10 mph 63 / 63°F 57% 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

S
S

 7 / 14 mph 55 / 53°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

WSW
WSW

 4 / 6 mph 62 / 62°F 58% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
0.0 In
13:00

SSW
SSW

 12 / 23 mph 83 / 84°F 47% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

S
S

 9 / 17 mph 68 / 68°F 63% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 27
May		01:00

SSW
SSW

 11 / 20 mph 69 / 69°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
45%
0.0 In
07:00

SW
SW

 11 / 19 mph 65 / 65°F 64% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

SW
SW

 11 / 21 mph 89 / 91°F 42% 1017 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

SSW
SSW

 12 / 21 mph 76 / 79°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: medium
12%
0.0 In
Tue 28
May		01:00

SSW
SSW

 12 / 22 mph 72 / 76°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

W
W

 6 / 11 mph 70 / 70°F 92% 1014 mb
Low level cloud: 54%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.1 In
13:00

SW
SW

 15 / 28 mph 89 / 92°F 44% 1012 mb
Low level cloud: 5%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

E
E

 7 / 13 mph 76 / 78°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
44%
0.0 In
Wed 29
May		01:00

SW
SW

 8 / 16 mph 68 / 68°F 90% 1014 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 73%
Most Significant Cloud Type: medium
12%
0.0 In
07:00

SSE
SSE

 2 / 4 mph 72 / 72°F 95% 1012 mb
Low level cloud: 91%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.4 In
13:00

W
W

 9 / 18 mph 88 / 86°F 33% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

N
N

 7 / 15 mph 66 / 66°F 98% 1011 mb
Low level cloud: 96%
Mid level cloud: 50%
High level cloud: 70%
Most Significant Cloud Type: low
100%
0.5 In
Thu 30
May		01:00

NW
NW

 3 / 6 mph 74 / 77°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

N
N

 3 / 7 mph 66 / 66°F 95% 1012 mb
Low level cloud: 83%
Mid level cloud: 60%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
13:00

S
S

 5 / 10 mph 90 / 91°F 38% 1016 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
19:00

ESE
ESE

 8 / 16 mph 70 / 70°F 87% 1010 mb
Low level cloud: 8%
Mid level cloud: 20%
High level cloud: 37%
Most Significant Cloud Type: low
19%
0.0 In
Fri 31
May		01:00

E
E

 9 / 18 mph 63 / 63°F 98% 1017 mb
Low level cloud: 98%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
07:00

WNW
WNW

 7 / 14 mph 67 / 67°F 92% 1011 mb
Low level cloud: 49%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
52%
0.2 In
13:00

NE
NE

 15 / 31 mph 74 / 77°F 49% 1020 mb
Low level cloud: 43%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.5 In
19:00

SW
SW

 7 / 14 mph 72 / 76°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 01
Jun		01:00

NNE
NNE

 5 / 11 mph 57 / 56°F 88% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NW
NW

 6 / 13 mph 63 / 64°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
13:00

ESE
ESE

 8 / 17 mph 73 / 76°F 44% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
0.0 In
19:00

NNE
NNE

 6 / 13 mph 64 / 64°F 63% 1014 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In

Other Locations Near to Waller Mill Reservoir

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