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Lockport 14 Day Long Range Forecast

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

Illinois, United States Of America

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

Reviewing the forecast for Lockport Over the next 14 days and the average daytime maximum temperature will be around 1°C, with a high for the two weeks of 7°C expected on the afternoon of Saturday 20th. The mean minimum temperature will be -6°C, dipping to its lowest on the morning of Sunday 14th at -19°C. Expect the coming 14 days to have mixed overhead conditions with some days dry and some seeing a significant amount of rain, sleet or snow. The indicators are that Thursday 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
Sat 13
Dec		00:00

W
W

 13 / 17 mph 25 / 13°F 86% 1020 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 81%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 13 / 17 mph 17 / 3°F 75% 1022 mb
Low level cloud: 4%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 12 / 15 mph 11 / -4°F 65% 1024 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 11 / 13 mph 10 / -4°F 66% 1026 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 10 / 12 mph 9 / -5°F 79% 1027 mb
Low level cloud: 91%
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
15:00

NW
NW

 11 / 14 mph 10 / -4°F 73% 1027 mb
Low level cloud: 63%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 11 / 14 mph 9 / -5°F 76% 1029 mb
Low level cloud: 26%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 11 / 13 mph 7 / -8°F 80% 1030 mb
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Dec		18:00

W
W

 6 / 7 mph 10 / 0°F 79% 1038 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 7 / 9 mph 8 / -4°F 81% 1036 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 70%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec		00:00

SW
SW

 9 / 11 mph 7 / -7°F 81% 1034 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 11 / 16 mph 5 / -10°F 73% 1031 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 14 / 21 mph 9 / -7°F 69% 1026 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 15 / 20 mph 15 / -1°F 68% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 99%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 14 / 18 mph 22 / 9°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 9 / 12 mph 24 / 15°F 76% 1019 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 4 / 6 mph 23 / 18°F 92% 1020 mb
Low level cloud: 4%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 3 / 6 mph 19 / 14°F 94% 1020 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Dec		00:00

SSE
SSE

 1 / 3 mph 17 / 17°F 95% 1020 mb
Low level cloud: 19%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 4 / 9 mph 17 / 10°F 95% 1019 mb
Low level cloud: 25%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 5 / 10 mph 18 / 11°F 95% 1017 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 70%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 8 / 14 mph 24 / 15°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 36%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 10 / 15 mph 32 / 24°F 83% 1012 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 12 / 20 mph 35 / 26°F 89% 1010 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 13 / 22 mph 34 / 25°F 93% 1009 mb
Low level cloud: 52%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 12 / 21 mph 35 / 26°F 95% 1009 mb
Low level cloud: 85%
Mid level cloud: 23%
High level cloud: 55%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		00:00

SW
SW

 12 / 21 mph 36 / 28°F 98% 1008 mb
Low level cloud: 97%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 12 / 20 mph 36 / 28°F 94% 1008 mb
Low level cloud: 37%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 11 / 19 mph 35 / 26°F 89% 1010 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 13 / 15 mph 33 / 23°F 72% 1015 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
12:00

NW
NW

 12 / 15 mph 31 / 22°F 60% 1018 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
15:00

NNW
NNW

 4 / 6 mph 31 / 27°F 60% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 7 / 12 mph 28 / 21°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 8 / 13 mph 28 / 20°F 76% 1020 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		00:00

SSE
SSE

 12 / 19 mph 30 / 20°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 15 / 24 mph 32 / 22°F 72% 1012 mb
Low level cloud: 0%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 20 / 32 mph 38 / 27°F 96% 1001 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 90%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

 19 / 32 mph 44 / 36°F 96% 999 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
12:00

W
W

 17 / 23 mph 44 / 36°F 79% 1001 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 58%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 21 / 34 mph 43 / 33°F 59% 1002 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 22 / 30 mph 29 / 15°F 66% 1007 mb
Low level cloud: 62%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 22 / 27 mph 23 / 8°F 65% 1012 mb
Low level cloud: 93%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 19
Dec		00:00

W
W

 21 / 28 mph 22 / 6°F 61% 1016 mb
Low level cloud: 37%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 17 / 21 mph 22 / 8°F 53% 1019 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
06:00

W
W

 13 / 16 mph 21 / 8°F 48% 1023 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
09:00

WNW
WNW

 11 / 14 mph 21 / 10°F 43% 1027 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 18%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 5 / 6 mph 25 / 19°F 35% 1025 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 22%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 7 / 9 mph 29 / 21°F 38% 1022 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 11 / 18 mph 29 / 19°F 48% 1019 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 16 / 26 mph 33 / 22°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Dec		00:00

NE
NE

 6 / 7 mph 36 / 31°F 89% 1024 mb
Low level cloud: 47%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
76%
0.0 In
06:00

ENE
ENE

 8 / 11 mph 36 / 30°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
0.0 In
12:00

N
N

 9 / 13 mph 38 / 32°F 86% 1016 mb
Low level cloud: 22%
Mid level cloud: 69%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NE
NE

 12 / 15 mph 41 / 34°F 97% 1011 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sun 21
Dec		00:00

NW
NW

 11 / 18 mph 31 / 22°F 68% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NNW
NNW

 11 / 18 mph 24 / 13°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

 8 / 9 mph 29 / 22°F 49% 1028 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

E
E

 2 / 2 mph 40 / 40°F 58% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 22
Dec		00:00

SSE
SSE

 4 / 5 mph 34 / 30°F 66% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

SE
SE

 6 / 10 mph 29 / 22°F 64% 1030 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
12:00

SSE
SSE

 9 / 11 mph 37 / 31°F 39% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

SSE
SSE

 11 / 19 mph 35 / 27°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 23
Dec		00:00

SSW
SSW

 11 / 17 mph 38 / 31°F 90% 1014 mb
Low level cloud: 100%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

 13 / 24 mph 38 / 29°F 91% 1015 mb
Low level cloud: 22%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
43%
0.0 In
12:00

W
W

 4 / 5 mph 44 / 42°F 87% 1017 mb
Low level cloud: 97%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

 7 / 9 mph 38 / 33°F 67% 1025 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 98%
Most Significant Cloud Type: medium
18%
0.0 In
Wed 24
Dec		00:00

NE
NE

 13 / 25 mph 32 / 23°F 79% 1022 mb
Low level cloud: 84%
Mid level cloud: 100%
High level cloud: 46%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

 5 / 6 mph 33 / 28°F 72% 1028 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
0.0 In
12:00

ENE
ENE

 12 / 13 mph 35 / 27°F 84% 1022 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 9 / 11 mph 33 / 26°F 79% 1029 mb
Low level cloud: 75%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 25
Dec		00:00

ENE
ENE

 8 / 10 mph 31 / 24°F 87% 1020 mb
Low level cloud: 95%
Mid level cloud: 82%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

 6 / 8 mph 31 / 26°F 87% 1031 mb
Low level cloud: 72%
Mid level cloud: 10%
High level cloud: 13%
Most Significant Cloud Type: low
76%
0.0 In
12:00

NE
NE

 4 / 5 mph 34 / 30°F 76% 1022 mb
Low level cloud: 100%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 8 / 9 mph 37 / 31°F 81% 1032 mb
Low level cloud: 36%
Mid level cloud: 86%
High level cloud: 85%
Most Significant Cloud Type: low
76%
0.0 In
Fri 26
Dec		00:00

NE
NE

 5 / 6 mph 33 / 29°F 86% 1020 mb
Low level cloud: 54%
Mid level cloud: 11%
High level cloud: 99%
Most Significant Cloud Type: low
69%
0.0 In
06:00

E
E

 11 / 16 mph 32 / 23°F 95% 1022 mb
Low level cloud: 85%
Mid level cloud: 79%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.1 In
12:00

N
N

 12 / 15 mph 29 / 19°F 89% 1019 mb
Low level cloud: 91%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NE
NE

 10 / 12 mph 36 / 29°F 98% 1014 mb
Low level cloud: 92%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.5 In
Sat 27
Dec		00:00

N
N

 9 / 11 mph 23 / 13°F 76% 1026 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

ENE
ENE

 9 / 14 mph 30 / 22°F 93% 1023 mb
Low level cloud: 99%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

 7 / 8 mph 27 / 19°F 85% 1024 mb
Low level cloud: 83%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

 3 / 3 mph 36 / 34°F 99% 1025 mb
Low level cloud: 86%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sun 28
Dec		00:00

WNW
WNW

 7 / 8 mph 24 / 16°F 86% 1021 mb
Low level cloud: 27%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
06:00

ENE
ENE

 4 / 7 mph 25 / 19°F 96% 1025 mb
Low level cloud: 68%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

 15 / 17 mph 14 / -1°F 70% 1021 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 4 / 5 mph 34 / 31°F 94% 1034 mb
Low level cloud: 44%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
44%
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