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Lancaster 14 Day Long Range Forecast

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

California, United States Of America

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

The outlook for Lancaster in the two weeks ahead shows the average daytime maximum temperature will be around 31°C, with a high for the two weeks of 36°C expected on the afternoon of Wednesday 17th. The average minimum temperature will be 16°C, dipping to its lowest on the morning of Thursday 11th at 13°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be moderate. The strongest wind will be felt on the afternoon of Tuesday 9th, coming from a south westerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 08
Sep		01:00

WSW
WSW

 9 / 20 mph 64 / 64°F 30% 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
04:00

WSW
WSW

 9 / 19 mph 64 / 64°F 32% 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
07:00

WSW
WSW

 9 / 15 mph 72 / 73°F 29% 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
10:00

SW
SW

 17 / 19 mph 87 / 82°F 14% 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
13:00

SW
SW

 21 / 25 mph 90 / 85°F 13% 1014 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

SW
SW

 24 / 27 mph 86 / 81°F 17% 1012 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

SW
SW

 14 / 30 mph 69 / 68°F 30% 1014 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

SW
SW

 10 / 21 mph 66 / 66°F 37% 1014 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
Tue 09
Sep		19:00

SW
SW

 17 / 35 mph 63 / 63°F 61% 1010 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 11 / 24 mph 60 / 60°F 69% 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
Wed 10
Sep		01:00

SW
SW

 11 / 21 mph 58 / 56°F 74% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 11 / 20 mph 57 / 54°F 74% 1010 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
07:00

WSW
WSW

 12 / 13 mph 62 / 61°F 70% 1012 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 16 / 18 mph 75 / 76°F 39% 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
13:00

SW
SW

 19 / 22 mph 80 / 78°F 33% 1010 mb
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
16:00

SW
SW

 23 / 26 mph 76 / 77°F 40% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 15 / 30 mph 62 / 61°F 63% 1011 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
22:00

SW
SW

 11 / 23 mph 58 / 56°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 11
Sep		01:00

SW
SW

 10 / 19 mph 57 / 55°F 80% 1013 mb
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
04:00

WSW
WSW

 10 / 19 mph 56 / 53°F 81% 1013 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
07:00

SW
SW

 11 / 12 mph 62 / 61°F 73% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 13 / 14 mph 76 / 76°F 39% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 16 / 19 mph 82 / 79°F 31% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 21 / 24 mph 78 / 78°F 42% 1011 mb
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
19:00

SW
SW

 14 / 29 mph 63 / 62°F 65% 1013 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
22:00

SW
SW

 10 / 20 mph 60 / 60°F 72% 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
Fri 12
Sep		01:00

WSW
WSW

 9 / 19 mph 58 / 57°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 10 / 20 mph 57 / 55°F 71% 1014 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
07:00

WSW
WSW

 8 / 10 mph 64 / 62°F 62% 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
10:00

W
W

 4 / 5 mph 79 / 77°F 33% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 1 / 1 mph 86 / 81°F 22% 1011 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 14 / 16 mph 86 / 82°F 23% 1009 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 10 / 19 mph 70 / 68°F 55% 1012 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

SW
SW

 9 / 17 mph 65 / 65°F 60% 1013 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
Sat 13
Sep		01:00

WSW
WSW

 8 / 17 mph 62 / 62°F 56% 1013 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

WSW
WSW

 7 / 15 mph 60 / 60°F 54% 1013 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
07:00

WSW
WSW

 6 / 9 mph 68 / 66°F 45% 1013 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
10:00

NW
NW

 1 / 1 mph 83 / 78°F 24% 1012 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

SW
SW

 6 / 7 mph 89 / 84°F 18% 1010 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
16:00

SW
SW

 17 / 20 mph 85 / 82°F 27% 1009 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

SW
SW

 12 / 25 mph 69 / 68°F 50% 1010 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

SW
SW

 9 / 18 mph 67 / 67°F 54% 1011 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
Sun 14
Sep		01:00

SW
SW

 9 / 19 mph 63 / 64°F 63% 1010 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

WSW
WSW

 9 / 18 mph 61 / 61°F 69% 1010 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
07:00

SW
SW

 9 / 13 mph 66 / 65°F 63% 1011 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
10:00

SW
SW

 9 / 10 mph 82 / 78°F 29% 1010 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
13:00

SW
SW

 17 / 19 mph 84 / 80°F 26% 1008 mb
Low level cloud: 0%
Mid level cloud: 14%
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

SW
SW

 22 / 25 mph 81 / 79°F 32% 1007 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
19:00

SW
SW

 12 / 24 mph 67 / 66°F 53% 1009 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 9 / 19 mph 64 / 64°F 60% 1010 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 15
Sep		04:00

WSW
WSW

 9 / 19 mph 59 / 57°F 35% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

WSW
WSW

 10 / 11 mph 85 / 81°F 20% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

SW
SW

 18 / 21 mph 89 / 86°F 25% 1009 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
22:00

SW
SW

 9 / 20 mph 60 / 60°F 62% 1010 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Tue 16
Sep		04:00

W
W

 8 / 17 mph 53 / 50°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

SW
SW

 15 / 18 mph 74 / 76°F 41% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

ENE
ENE

 12 / 14 mph 97 / 94°F 9% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

WSW
WSW

 7 / 15 mph 72 / 74°F 30% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 17
Sep		04:00

W
W

 5 / 11 mph 73 / 74°F 27% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

ENE
ENE

 6 / 7 mph 92 / 88°F 16% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

ENE
ENE

 4 / 5 mph 103 / 102°F 9% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

SW
SW

 7 / 14 mph 74 / 75°F 31% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 18
Sep		04:00

WSW
WSW

 5 / 11 mph 73 / 74°F 25% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

NE
NE

 1 / 2 mph 96 / 93°F 15% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

SW
SW

 11 / 13 mph 98 / 96°F 11% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

SW
SW

 9 / 19 mph 70 / 70°F 29% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 19
Sep		04:00

WSW
WSW

 9 / 19 mph 69 / 69°F 32% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

SW
SW

 14 / 16 mph 91 / 87°F 16% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

WSW
WSW

 15 / 17 mph 97 / 94°F 12% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

WSW
WSW

 9 / 20 mph 68 / 68°F 23% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 20
Sep		04:00

SW
SW

 12 / 25 mph 69 / 69°F 29% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

SW
SW

 9 / 11 mph 89 / 85°F 13% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
16:00

W
W

 17 / 19 mph 95 / 92°F 10% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

W
W

 9 / 13 mph 72 / 76°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: medium
48%
0.0 In
Sun 21
Sep		04:00

SW
SW

 9 / 19 mph 66 / 66°F 30% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 93%
Most Significant Cloud Type: high
92%
0.0 In
10:00

NNW
NNW

 5 / 6 mph 75 / 77°F 48% 1009 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 76%
Most Significant Cloud Type: medium
47%
0.0 In
16:00

W
W

 15 / 18 mph 92 / 89°F 11% 1006 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: medium
18%
0.0 In
22:00

E
E

 3 / 4 mph 67 / 67°F 88% 1007 mb
Low level cloud: 57%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.3 In
Mon 22
Sep		04:00

WSW
WSW

 9 / 19 mph 67 / 67°F 25% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 66%
Most Significant Cloud Type: medium
9%
0.0 In
10:00

WSW
WSW

 4 / 5 mph 69 / 69°F 85% 1010 mb
Low level cloud: 38%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
68%
1.1 In
16:00

W
W

 14 / 16 mph 95 / 92°F 9% 1005 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 10%
Most Significant Cloud Type: medium
44%
0.0 In
22:00

SW
SW

 9 / 12 mph 66 / 66°F 88% 1011 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
Tue 23
Sep		04:00

WSW
WSW

 7 / 15 mph 69 / 69°F 21% 1008 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

NNE
NNE

 3 / 4 mph 78 / 79°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
16:00

W
W

 15 / 17 mph 96 / 92°F 9% 1004 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
22:00

WNW
WNW

 7 / 13 mph 72 / 76°F 59% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
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