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Sneachill 14 Day Long Range Forecast

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

Hereford and Worcester, United Kingdom

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

Taking a look at Sneachill over the coming two weeks and the average daytime maximum temperature will be around 20°C, with a high for the two weeks of 22°C expected on the afternoon of Monday 19th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Saturday 10th at 5°C. The fortnight ahead will have mostly dry days although Sunday 11th and Monday 12th are likely to see a little rain. The indicators are that Monday 12th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 10
May
15:00

E
E

8 / 11 mph 65 / 63°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

12 / 18 mph 63 / 62°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

7 / 15 mph 52 / 49°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 11
May
00:00

ENE
ENE

5 / 11 mph 49 / 47°F 86% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 64%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 13 mph 46 / 43°F 91% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 93%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

5 / 9 mph 48 / 46°F 87% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

8 / 9 mph 62 / 60°F 65% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 22%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

11 / 13 mph 68 / 66°F 57% 1011 mb
Low level cloud: 14%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

11 / 14 mph 69 / 68°F 57% 1009 mb
Low level cloud: 62%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

9 / 14 mph 65 / 63°F 80% 1009 mb
Low level cloud: 20%
Mid level cloud: 31%
High level cloud: 34%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

7 / 15 mph 56 / 54°F 93% 1009 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 38%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
May
00:00

ENE
ENE

4 / 9 mph 52 / 52°F 92% 1009 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 9 mph 50 / 49°F 92% 1009 mb
Low level cloud: 11%
Mid level cloud: 32%
High level cloud: 8%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 7 mph 54 / 52°F 93% 1010 mb
Low level cloud: 10%
Mid level cloud: 37%
High level cloud: 13%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

8 / 9 mph 65 / 63°F 80% 1010 mb
Low level cloud: 43%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

13 / 16 mph 70 / 69°F 62% 1010 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

12 / 19 mph 69 / 67°F 74% 1011 mb
Low level cloud: 42%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: low
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ESE
ESE

10 / 15 mph 66 / 65°F 81% 1012 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

E
E

8 / 14 mph 57 / 56°F 92% 1015 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
Tue 13
May
00:00

ENE
ENE

8 / 15 mph 51 / 48°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

8 / 15 mph 47 / 44°F 91% 1017 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

9 / 15 mph 50 / 46°F 88% 1018 mb
Low level cloud: 3%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

13 / 15 mph 62 / 61°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

13 / 15 mph 68 / 67°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

14 / 18 mph 69 / 68°F 57% 1018 mb
Low level cloud: 46%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

13 / 15 mph 67 / 66°F 65% 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
21:00

ENE
ENE

9 / 11 mph 58 / 56°F 81% 1021 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 14
May
00:00

NE
NE

8 / 9 mph 51 / 48°F 83% 1022 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
03:00

NE
NE

6 / 12 mph 44 / 40°F 87% 1022 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

NNE
NNE

6 / 10 mph 46 / 42°F 81% 1022 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

ENE
ENE

10 / 11 mph 59 / 57°F 63% 1022 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
12:00

E
E

11 / 13 mph 66 / 65°F 52% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

11 / 13 mph 68 / 66°F 53% 1021 mb
Low level cloud: 37%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

9 / 12 mph 67 / 65°F 68% 1021 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

7 / 13 mph 55 / 53°F 84% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May
00:00

ENE
ENE

4 / 8 mph 49 / 47°F 82% 1024 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
03:00

NNE
NNE

4 / 9 mph 45 / 43°F 81% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 74%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 6 mph 48 / 46°F 71% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

6 / 7 mph 59 / 57°F 56% 1025 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
12:00

N
N

8 / 9 mph 66 / 65°F 43% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

8 / 10 mph 69 / 67°F 43% 1023 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
18:00

NW
NW

6 / 7 mph 69 / 67°F 64% 1023 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
21:00

NNE
NNE

7 / 10 mph 57 / 56°F 75% 1024 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
Fri 16
May
00:00

NE
NE

4 / 6 mph 51 / 51°F 84% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

4 / 7 mph 46 / 44°F 91% 1026 mb
Low level cloud: 4%
Mid level cloud: 2%
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

NE
NE

6 / 9 mph 47 / 43°F 90% 1026 mb
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

7 / 8 mph 58 / 55°F 67% 1026 mb
Low level cloud: 7%
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
12:00

E
E

9 / 10 mph 67 / 65°F 62% 1025 mb
Low level cloud: 49%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

8 / 10 mph 69 / 68°F 55% 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
18:00

ESE
ESE

6 / 7 mph 70 / 68°F 70% 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
21:00

ENE
ENE

6 / 10 mph 59 / 58°F 88% 1025 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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 17
May
00:00

ENE
ENE

6 / 12 mph 55 / 54°F 83% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

6 / 12 mph 53 / 51°F 80% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
0.0 In
12:00

E
E

12 / 24 mph 67 / 67°F 56% 1026 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
18:00

E
E

5 / 11 mph 75 / 78°F 67% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 18
May
00:00

NNE
NNE

9 / 20 mph 52 / 49°F 70% 1032 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

N
N

7 / 15 mph 50 / 47°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NNE
NNE

9 / 19 mph 68 / 68°F 46% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NE
NE

7 / 15 mph 68 / 68°F 65% 1025 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 19
May
00:00

NE
NE

4 / 9 mph 55 / 55°F 92% 1028 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

4 / 7 mph 55 / 54°F 87% 1028 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
12:00

NNW
NNW

3 / 7 mph 74 / 76°F 46% 1029 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

ENE
ENE

4 / 8 mph 73 / 77°F 63% 1026 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.0 In
Tue 20
May
00:00

N
N

6 / 13 mph 56 / 54°F 83% 1030 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NNE
NNE

5 / 10 mph 55 / 54°F 80% 1027 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 9%
Most Significant Cloud Type: medium
20%
0.0 In
12:00

NNW
NNW

4 / 9 mph 74 / 77°F 53% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

E
E

8 / 16 mph 67 / 67°F 75% 1022 mb
Low level cloud: 2%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
Wed 21
May
00:00

NNW
NNW

5 / 11 mph 61 / 61°F 73% 1028 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
06:00

N
N

5 / 10 mph 57 / 57°F 90% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

WSW
WSW

6 / 12 mph 75 / 77°F 57% 1026 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
19%
0.0 In
18:00

ENE
ENE

6 / 13 mph 69 / 69°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
0.0 In
Thu 22
May
00:00

NW
NW

4 / 9 mph 61 / 61°F 91% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

ESE
ESE

0 / 1 mph 59 / 59°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 26%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

SSW
SSW

9 / 19 mph 72 / 76°F 48% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

SW
SW

11 / 23 mph 64 / 64°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 97%
Most Significant Cloud Type: medium
16%
0.0 In
Fri 23
May
00:00

S
S

2 / 5 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%
0.0 In
06:00

S
S

9 / 19 mph 54 / 51°F 87% 1009 mb
Low level cloud: 89%
Mid level cloud: 98%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

15 / 32 mph 67 / 67°F 51% 1013 mb
Low level cloud: 52%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
18:00

S
S

14 / 29 mph 63 / 63°F 78% 1007 mb
Low level cloud: 50%
Mid level cloud: 43%
High level cloud: 14%
Most Significant Cloud Type: low
66%
0.0 In
Sat 24
May
00:00

W
W

4 / 9 mph 56 / 55°F 92% 1013 mb
Low level cloud: 74%
Mid level cloud: 15%
High level cloud: 13%
Most Significant Cloud Type: low
80%
0.0 In
06:00

SE
SE

6 / 13 mph 55 / 54°F 90% 1008 mb
Low level cloud: 28%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
12:00

SW
SW

10 / 20 mph 67 / 67°F 47% 1012 mb
Low level cloud: 3%
Mid level cloud: 10%
High level cloud: 61%
Most Significant Cloud Type: medium
20%
0.0 In
18:00

SW
SW

9 / 19 mph 63 / 63°F 78% 1010 mb
Low level cloud: 31%
Mid level cloud: 46%
High level cloud: 35%
Most Significant Cloud Type: low
51%
0.0 In
Sun 25
May
00:00

SSW
SSW

6 / 12 mph 52 / 51°F 79% 1011 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 42%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

NNE
NNE

4 / 8 mph 59 / 59°F 90% 1013 mb
Low level cloud: 25%
Mid level cloud: 31%
High level cloud: 28%
Most Significant Cloud Type: low
39%
0.0 In
12:00

SSW
SSW

15 / 32 mph 55 / 52°F 82% 1009 mb
Low level cloud: 98%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

6 / 13 mph 74 / 77°F 70% 1009 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 94%
Most Significant Cloud Type: medium
33%
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