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Hatsukaichi 14 Day Long Range Forecast

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

Japan

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

For Hatsukaichi in the coming two weeks the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 17°C expected on the afternoon of Saturday 20th. The mean minimum temperature will be 5°C, dipping to its lowest on the morning of Tuesday 16th at 1°C. The coming 14 days will have some days seeing a little precipitation and some days with rain or sleet. It looks like Sunday 21st will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 15
Dec
15:00

NW
NW

6 / 7 mph 51 / 48°F 49% 1022 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

4 / 4 mph 48 / 46°F 68% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

4 / 8 mph 38 / 35°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Dec
00:00

NW
NW

4 / 8 mph 36 / 33°F 71% 1024 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
03:00

NW
NW

3 / 7 mph 35 / 32°F 68% 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
06:00

NW
NW

4 / 8 mph 34 / 31°F 65% 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
09:00

NW
NW

1 / 1 mph 45 / 45°F 59% 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
12:00

SW
SW

5 / 5 mph 53 / 51°F 57% 1023 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

3 / 3 mph 56 / 56°F 57% 1022 mb
Low level cloud: 26%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

4 / 7 mph 45 / 44°F 78% 1023 mb
Low level cloud: 22%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

4 / 9 mph 43 / 41°F 84% 1024 mb
Low level cloud: 17%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec
00:00

WSW
WSW

3 / 5 mph 45 / 44°F 81% 1023 mb
Low level cloud: 33%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

4 / 8 mph 46 / 43°F 83% 1022 mb
Low level cloud: 69%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

4 / 6 mph 46 / 45°F 85% 1022 mb
Low level cloud: 27%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

3 / 4 mph 50 / 49°F 83% 1022 mb
Low level cloud: 33%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

6 / 7 mph 58 / 56°F 70% 1020 mb
Low level cloud: 52%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

5 / 6 mph 52 / 51°F 89% 1019 mb
Low level cloud: 96%
Mid level cloud: 84%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

1 / 1 mph 50 / 50°F 94% 1020 mb
Low level cloud: 90%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

N
N

5 / 7 mph 49 / 47°F 89% 1021 mb
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec
00:00

NNW
NNW

4 / 7 mph 48 / 46°F 86% 1022 mb
Low level cloud: 24%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

5 / 7 mph 47 / 44°F 85% 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
06:00

NNW
NNW

5 / 9 mph 43 / 40°F 84% 1024 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

4 / 4 mph 51 / 50°F 76% 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
12:00

NE
NE

1 / 1 mph 58 / 57°F 59% 1024 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
15:00

SE
SE

3 / 4 mph 58 / 57°F 62% 1023 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

0 / 0 mph 50 / 50°F 81% 1026 mb
Low level cloud: 5%
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
21:00

NNW
NNW

2 / 4 mph 45 / 45°F 85% 1026 mb
Low level cloud: 5%
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
Fri 19
Dec
00:00

NNW
NNW

2 / 4 mph 43 / 43°F 87% 1026 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

2 / 4 mph 42 / 42°F 88% 1027 mb
Low level cloud: 5%
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
06:00

NNW
NNW

2 / 4 mph 41 / 41°F 88% 1027 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
09:00

E
E

1 / 1 mph 51 / 50°F 81% 1027 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

3 / 4 mph 58 / 57°F 72% 1026 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

4 / 4 mph 58 / 58°F 72% 1024 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

2 / 4 mph 50 / 51°F 85% 1026 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

2 / 4 mph 48 / 48°F 85% 1026 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec
00:00

E
E

1 / 2 mph 48 / 47°F 88% 1025 mb
Low level cloud: 60%
Mid level cloud: 6%
High level cloud: 94%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

3 / 6 mph 49 / 48°F 87% 1025 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 86%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

1 / 2 mph 47 / 47°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 69%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

1 / 2 mph 55 / 54°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

1 / 1 mph 56 / 55°F 79% 1023 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

2 / 3 mph 62 / 61°F 70% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

1 / 2 mph 54 / 54°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

1 / 2 mph 53 / 53°F 84% 1022 mb
Low level cloud: 3%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 21
Dec
00:00

WSW
WSW

2 / 3 mph 53 / 53°F 85% 1021 mb
Low level cloud: 32%
Mid level cloud: 49%
High level cloud: 5%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

0 / 1 mph 53 / 53°F 88% 1020 mb
Low level cloud: 59%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

1 / 2 mph 51 / 51°F 92% 1019 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

1 / 2 mph 53 / 53°F 92% 1020 mb
Low level cloud: 96%
Mid level cloud: 80%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

2 / 2 mph 56 / 56°F 95% 1018 mb
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NNE
NNE

5 / 6 mph 57 / 56°F 96% 1018 mb
Low level cloud: 88%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
18:00

NNE
NNE

6 / 6 mph 57 / 56°F 94% 1019 mb
Low level cloud: 67%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

7 / 8 mph 55 / 53°F 90% 1019 mb
Low level cloud: 52%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 22
Dec
03:00

N
N

2 / 3 mph 55 / 55°F 89% 1016 mb
Low level cloud: 64%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
09:00

NE
NE

3 / 4 mph 54 / 54°F 83% 1019 mb
Low level cloud: 73%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
76%
0.0 In
15:00

S
S

14 / 20 mph 62 / 62°F 97% 1007 mb
Low level cloud: 78%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
21:00

W
W

17 / 26 mph 38 / 28°F 72% 1013 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Tue 23
Dec
03:00

N
N

16 / 22 mph 43 / 35°F 78% 1023 mb
Low level cloud: 50%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
51%
0.0 In
09:00

NNE
NNE

5 / 7 mph 47 / 45°F 68% 1029 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
15:00

NE
NE

7 / 10 mph 58 / 57°F 49% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
0.0 In
21:00

NNE
NNE

8 / 12 mph 44 / 40°F 77% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
0.0 In
Wed 24
Dec
03:00

N
N

2 / 2 mph 46 / 46°F 71% 1025 mb
Low level cloud: 20%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
09:00

NNE
NNE

4 / 6 mph 50 / 49°F 66% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
0.0 In
15:00

NE
NE

1 / 2 mph 51 / 51°F 88% 1020 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.1 In
21:00

NW
NW

1 / 2 mph 47 / 47°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
45%
0.0 In
Thu 25
Dec
03:00

NNW
NNW

1 / 1 mph 50 / 50°F 95% 1012 mb
Low level cloud: 78%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
09:00

NNE
NNE

6 / 8 mph 47 / 44°F 94% 1011 mb
Low level cloud: 94%
Mid level cloud: 83%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.2 In
15:00

NNW
NNW

14 / 21 mph 53 / 49°F 77% 1012 mb
Low level cloud: 52%
Mid level cloud: 99%
High level cloud: 17%
Most Significant Cloud Type: low
88%
0.2 In
21:00

N
N

12 / 18 mph 47 / 41°F 81% 1015 mb
Low level cloud: 62%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.1 In
Fri 26
Dec
03:00

NNE
NNE

4 / 7 mph 42 / 39°F 85% 1016 mb
Low level cloud: 34%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
09:00

N
N

2 / 2 mph 48 / 48°F 76% 1016 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
15:00

NE
NE

2 / 2 mph 48 / 48°F 84% 1016 mb
Low level cloud: 77%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
21:00

WSW
WSW

7 / 11 mph 45 / 41°F 80% 1012 mb
Low level cloud: 3%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
Sat 27
Dec
03:00

WNW
WNW

4 / 6 mph 45 / 43°F 89% 1018 mb
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
09:00

WNW
WNW

9 / 14 mph 44 / 38°F 75% 1014 mb
Low level cloud: 24%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.1 In
15:00

SW
SW

2 / 3 mph 53 / 53°F 64% 1015 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
94%
0.0 In
21:00

WNW
WNW

4 / 7 mph 38 / 35°F 76% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
5%
0.0 In
Sun 28
Dec
03:00

WNW
WNW

11 / 18 mph 40 / 33°F 74% 1017 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
09:00

SW
SW

9 / 13 mph 44 / 39°F 94% 1013 mb
Low level cloud: 93%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
15:00

NW
NW

13 / 22 mph 47 / 41°F 52% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
21:00

W
W

7 / 12 mph 43 / 38°F 77% 1016 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: medium
18%
0.1 In
Mon 29
Dec
03:00

WNW
WNW

4 / 8 mph 39 / 36°F 69% 1023 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 56%
Most Significant Cloud Type: medium
6%
0.0 In
09:00

W
W

6 / 9 mph 44 / 41°F 76% 1016 mb
Low level cloud: 14%
Mid level cloud: 75%
High level cloud: 86%
Most Significant Cloud Type: medium
100%
0.0 In
15:00

WSW
WSW

6 / 10 mph 51 / 49°F 58% 1022 mb
Low level cloud: 33%
Mid level cloud: 73%
High level cloud: 16%
Most Significant Cloud Type: low
60%
0.0 In
21:00

WSW
WSW

15 / 26 mph 43 / 35°F 91% 1006 mb
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.3 In
Tue 30
Dec
03:00

NNW
NNW

3 / 5 mph 40 / 38°F 69% 1024 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
09:00

WNW
WNW

18 / 31 mph 36 / 26°F 80% 1010 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.1 In
15:00

W
W

2 / 4 mph 55 / 56°F 56% 1021 mb
Low level cloud: 28%
Mid level cloud: 47%
High level cloud: 16%
Most Significant Cloud Type: low
46%
0.0 In
21:00

W
W

17 / 30 mph 37 / 28°F 81% 1010 mb
Low level cloud: 12%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.1 In

Other Locations Near to Hatsukaichi

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