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Mount Shasta Ski Park 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Mount Shasta Ski Park

California, United States Of America

Long range weather outlook for Mount Shasta Ski Park includes 14 day forecast summary:

For Mount Shasta Ski Park in the coming two weeks the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 22°C expected on the afternoon of Tuesday 17th. The average minimum temperature will be 6°C, dipping to its lowest on the morning of Saturday 21st at -5°C. Expect the coming 14 days to remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 11
Mar		01:00

NNW
NNW

 4 / 9 mph 35 / 32°F 66% 1029 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
04:00

NNW
NNW

 4 / 9 mph 35 / 32°F 64% 1029 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
07:00

NNW
NNW

 4 / 8 mph 37 / 33°F 64% 1031 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 2 / 2 mph 47 / 46°F 39% 1028 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 4 / 6 mph 54 / 52°F 35% 1026 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 5 / 8 mph 54 / 52°F 39% 1025 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 3 / 6 mph 45 / 44°F 69% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 3 / 6 mph 43 / 42°F 67% 1029 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Mar		19:00

NW
NW

 4 / 8 mph 47 / 46°F 67% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 4 / 9 mph 45 / 42°F 68% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 11%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 13
Mar		01:00

NNW
NNW

 4 / 9 mph 43 / 40°F 69% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 4 / 10 mph 41 / 38°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 4 / 9 mph 42 / 39°F 61% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 2 / 3 mph 54 / 52°F 32% 1019 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 31%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 4 / 5 mph 59 / 58°F 27% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 3 / 5 mph 57 / 56°F 33% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 16%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 3 / 6 mph 47 / 47°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 4 / 8 mph 46 / 44°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 14
Mar		01:00

NNW
NNW

 5 / 10 mph 43 / 40°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 6 / 11 mph 41 / 37°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 4 / 8 mph 43 / 40°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 5 / 9 mph 43 / 40°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 7 / 10 mph 50 / 46°F 49% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 21%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 7 / 12 mph 49 / 45°F 41% 1019 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
19:00

NNW
NNW

 5 / 11 mph 42 / 39°F 62% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 6 / 13 mph 40 / 36°F 67% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 52%
Most Significant Cloud Type: high
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 15
Mar		01:00

NNW
NNW

 6 / 12 mph 39 / 35°F 60% 1025 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 6 / 12 mph 39 / 35°F 46% 1025 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 6 / 12 mph 42 / 37°F 41% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 3 / 4 mph 54 / 53°F 24% 1023 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
13:00

NNW
NNW

 3 / 4 mph 62 / 60°F 27% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 7 / 12 mph 59 / 56°F 35% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 6 / 12 mph 51 / 49°F 52% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 5 / 11 mph 49 / 47°F 53% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 16
Mar		01:00

NNW
NNW

 6 / 12 mph 47 / 45°F 57% 1024 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

NNW
NNW

 6 / 13 mph 47 / 44°F 58% 1024 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

NNW
NNW

 6 / 12 mph 47 / 44°F 56% 1025 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

NNE
NNE

 2 / 4 mph 61 / 59°F 28% 1023 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

WNW
WNW

 1 / 1 mph 68 / 66°F 24% 1021 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
16:00

NW
NW

 3 / 5 mph 67 / 65°F 27% 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
19:00

N
N

 5 / 10 mph 55 / 55°F 50% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 4 / 9 mph 54 / 53°F 53% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 17
Mar		01:00

N
N

 4 / 8 mph 54 / 53°F 52% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 9 mph 52 / 51°F 52% 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
07:00

N
N

 4 / 8 mph 55 / 54°F 52% 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
10:00

SE
SE

 2 / 4 mph 66 / 65°F 33% 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

S
S

 5 / 7 mph 72 / 73°F 26% 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
16:00

S
S

 4 / 7 mph 71 / 69°F 31% 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
19:00

NW
NW

 2 / 3 mph 60 / 60°F 61% 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
22:00

NNW
NNW

 3 / 6 mph 58 / 59°F 63% 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 18
Mar		04:00

NNW
NNW

 2 / 5 mph 54 / 55°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
10:00

S
S

 4 / 7 mph 61 / 62°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
0.0 In
16:00

S
S

 8 / 10 mph 67 / 67°F 40% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
22:00

NNW
NNW

 1 / 3 mph 55 / 55°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 19
Mar		04:00

SSW
SSW

 1 / 2 mph 52 / 52°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
3%
0.0 In
10:00

S
S

 5 / 8 mph 60 / 60°F 52% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
5%
0.0 In
16:00

S
S

 9 / 12 mph 61 / 61°F 41% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 21%
Most Significant Cloud Type: medium
4%
0.0 In
22:00

SW
SW

 2 / 4 mph 52 / 53°F 90% 1019 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
Fri 20
Mar		04:00

SW
SW

 3 / 7 mph 38 / 36°F 92% 1015 mb
Low level cloud: 35%
Mid level cloud: 83%
High level cloud: 17%
Most Significant Cloud Type: low
65%
0.0 In
10:00

SSW
SSW

 5 / 7 mph 55 / 54°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: medium
49%
0.0 In
16:00

NNW
NNW

 6 / 8 mph 45 / 42°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: medium
47%
0.1 In
22:00

NNW
NNW

 8 / 15 mph 38 / 32°F 86% 1019 mb
Low level cloud: 27%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
48%
0.0 In
Sat 21
Mar		04:00

NW
NW

 6 / 9 mph 25 / 18°F 83% 1023 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
10:00

NNW
NNW

 7 / 10 mph 34 / 28°F 35% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
16:00

NW
NW

 12 / 19 mph 31 / 22°F 52% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.1 In
22:00

NNW
NNW

 7 / 11 mph 27 / 20°F 66% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 22
Mar		04:00

NW
NW

 5 / 8 mph 18 / 12°F 80% 1026 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
10:00

NNW
NNW

 5 / 6 mph 34 / 29°F 30% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 11%
Most Significant Cloud Type: medium
1%
0.0 In
16:00

NNW
NNW

 11 / 17 mph 27 / 17°F 54% 1023 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
22:00

NNW
NNW

 6 / 10 mph 30 / 24°F 55% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 23
Mar		04:00

NNW
NNW

 5 / 9 mph 18 / 11°F 83% 1029 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 12%
Most Significant Cloud Type: medium
8%
0.0 In
10:00

NNW
NNW

 4 / 6 mph 38 / 35°F 28% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
0.0 In
16:00

NNW
NNW

 9 / 15 mph 31 / 23°F 39% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
22:00

NNW
NNW

 6 / 11 mph 32 / 26°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 24
Mar		04:00

NNE
NNE

 4 / 10 mph 24 / 18°F 61% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 56%
Most Significant Cloud Type: high
56%
0.0 In
10:00

SSW
SSW

 3 / 4 mph 45 / 45°F 37% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
16:00

ESE
ESE

 3 / 5 mph 49 / 49°F 22% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
0.0 In
22:00

W
W

 2 / 4 mph 38 / 38°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
0.0 In
Wed 25
Mar		04:00

NNW
NNW

 2 / 5 mph 34 / 33°F 51% 1026 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
0.0 In
10:00

S
S

 5 / 9 mph 37 / 34°F 92% 1016 mb
Low level cloud: 52%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
86%
0.0 In
16:00

SE
SE

 1 / 1 mph 47 / 47°F 36% 1019 mb
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: medium
75%
0.0 In
22:00

SSW
SSW

 4 / 8 mph 33 / 29°F 97% 1014 mb
Low level cloud: 78%
Mid level cloud: 68%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
Thu 26
Mar		04:00

N
N

 3 / 6 mph 40 / 39°F 55% 1019 mb
Low level cloud: 0%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: medium
90%
0.0 In
10:00

S
S

 6 / 9 mph 34 / 29°F 98% 1015 mb
Low level cloud: 89%
Mid level cloud: 67%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.3 In
16:00

S
S

 2 / 3 mph 51 / 52°F 34% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
22:00

SW
SW

 4 / 6 mph 33 / 29°F 98% 1013 mb
Low level cloud: 79%
Mid level cloud: 79%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.1 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