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Irlam 14 Day Long Range Forecast

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

Trafford, United Kingdom

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

Over the next 14 days the Irlam forecast suggests the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 18°C expected on the evening of Wednesday 18th. The mean minimum temperature will be 6°C, dipping to its lowest on the morning of Monday 23rd at 3°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain, sleet or snow. It looks like Monday 23rd will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 16
Mar
12:00

WSW
WSW

11 / 14 mph 50 / 45°F 68% 1011 mb
Low level cloud: 87%
Mid level cloud: 60%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

8 / 11 mph 48 / 44°F 83% 1010 mb
Low level cloud: 99%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

11 / 16 mph 48 / 43°F 91% 1010 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

9 / 14 mph 48 / 44°F 94% 1010 mb
Low level cloud: 100%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 17
Mar
00:00

S
S

9 / 14 mph 48 / 44°F 96% 1010 mb
Low level cloud: 100%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

10 / 15 mph 48 / 44°F 96% 1009 mb
Low level cloud: 100%
Mid level cloud: 22%
High level cloud: 80%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

11 / 17 mph 48 / 44°F 95% 1009 mb
Low level cloud: 100%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

13 / 16 mph 52 / 47°F 84% 1010 mb
Low level cloud: 39%
Mid level cloud: 2%
High level cloud: 14%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

15 / 17 mph 57 / 53°F 54% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

13 / 15 mph 60 / 59°F 52% 1009 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
18:00

S
S

11 / 14 mph 56 / 52°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

8 / 10 mph 54 / 51°F 79% 1013 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
Wed 18
Mar
00:00

SSE
SSE

5 / 7 mph 49 / 47°F 87% 1014 mb
Low level cloud: 6%
Mid level cloud: 1%
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

SE
SE

4 / 8 mph 47 / 44°F 90% 1016 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

ESE
ESE

4 / 8 mph 45 / 43°F 91% 1017 mb
Low level cloud: 6%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 6 mph 53 / 51°F 77% 1020 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
12:00

SSE
SSE

8 / 9 mph 62 / 61°F 58% 1021 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

8 / 10 mph 65 / 64°F 55% 1022 mb
Low level cloud: 15%
Mid level cloud: 2%
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

ESE
ESE

5 / 5 mph 65 / 64°F 71% 1023 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 5 mph 57 / 57°F 84% 1026 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 19
Mar
00:00

ESE
ESE

3 / 4 mph 53 / 53°F 90% 1027 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

3 / 5 mph 50 / 49°F 89% 1028 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
06:00

E
E

2 / 4 mph 47 / 47°F 79% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

2 / 2 mph 53 / 51°F 54% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 56%
Most Significant Cloud Type: high
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

3 / 3 mph 59 / 59°F 36% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 37%
Most Significant Cloud Type: high
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

3 / 4 mph 62 / 60°F 33% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

4 / 6 mph 58 / 56°F 49% 1026 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

4 / 5 mph 54 / 54°F 61% 1027 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 20
Mar
00:00

ENE
ENE

3 / 5 mph 49 / 49°F 79% 1027 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

3 / 5 mph 46 / 45°F 82% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

2 / 4 mph 44 / 44°F 81% 1025 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

2 / 2 mph 47 / 47°F 67% 1025 mb
Low level cloud: 79%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

1 / 1 mph 50 / 50°F 63% 1024 mb
Low level cloud: 93%
Mid level cloud: 44%
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

NE
NE

3 / 3 mph 52 / 52°F 73% 1022 mb
Low level cloud: 90%
Mid level cloud: 94%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

3 / 3 mph 51 / 51°F 88% 1022 mb
Low level cloud: 100%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

2 / 3 mph 49 / 49°F 91% 1022 mb
Low level cloud: 93%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Mar
00:00

ENE
ENE

2 / 3 mph 47 / 47°F 86% 1020 mb
Low level cloud: 80%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

3 / 4 mph 46 / 46°F 85% 1020 mb
Low level cloud: 71%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

3 / 4 mph 45 / 44°F 87% 1019 mb
Low level cloud: 40%
Mid level cloud: 59%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

5 / 6 mph 47 / 44°F 73% 1020 mb
Low level cloud: 31%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

6 / 6 mph 53 / 51°F 51% 1018 mb
Low level cloud: 27%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

6 / 7 mph 55 / 52°F 43% 1017 mb
Low level cloud: 17%
Mid level cloud: 23%
High level cloud: 21%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

5 / 7 mph 52 / 49°F 53% 1017 mb
Low level cloud: 23%
Mid level cloud: 24%
High level cloud: 39%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

3 / 3 mph 49 / 49°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Mar
00:00

E
E

2 / 3 mph 45 / 45°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

3 / 4 mph 42 / 40°F 81% 1017 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
06:00

ENE
ENE

3 / 5 mph 40 / 37°F 78% 1016 mb
Low level cloud: 23%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

4 / 5 mph 45 / 42°F 70% 1015 mb
Low level cloud: 52%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

4 / 5 mph 44 / 42°F 86% 1014 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

4 / 5 mph 49 / 47°F 70% 1011 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

4 / 5 mph 47 / 46°F 84% 1010 mb
Low level cloud: 19%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

5 / 8 mph 44 / 42°F 91% 1009 mb
Low level cloud: 30%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 23
Mar
00:00

ESE
ESE

10 / 16 mph 49 / 45°F 82% 1005 mb
Low level cloud: 97%
Mid level cloud: 92%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SE
SE

4 / 7 mph 38 / 35°F 93% 1001 mb
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
12:00

ESE
ESE

10 / 18 mph 47 / 43°F 86% 1000 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

4 / 9 mph 57 / 57°F 83% 1004 mb
Low level cloud: 45%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
Tue 24
Mar
00:00

N
N

4 / 8 mph 46 / 44°F 93% 1015 mb
Low level cloud: 86%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
06:00

NE
NE

12 / 23 mph 41 / 34°F 92% 1012 mb
Low level cloud: 89%
Mid level cloud: 62%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

12 / 20 mph 47 / 42°F 89% 998 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
18:00

WNW
WNW

9 / 18 mph 51 / 47°F 84% 1010 mb
Low level cloud: 16%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
31%
0.0 In
Wed 25
Mar
00:00

W
W

15 / 28 mph 43 / 36°F 77% 1005 mb
Low level cloud: 78%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.1 In
06:00

WNW
WNW

5 / 9 mph 43 / 40°F 97% 1018 mb
Low level cloud: 63%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
68%
0.0 In
12:00

WNW
WNW

17 / 35 mph 52 / 47°F 71% 1006 mb
Low level cloud: 50%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: low
52%
0.1 In
18:00

WNW
WNW

5 / 10 mph 50 / 48°F 92% 1021 mb
Low level cloud: 98%
Mid level cloud: 94%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
Thu 26
Mar
00:00

WSW
WSW

6 / 12 mph 54 / 52°F 94% 1011 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

4 / 9 mph 49 / 47°F 96% 1021 mb
Low level cloud: 57%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
79%
0.0 In
12:00

W
W

11 / 22 mph 58 / 56°F 67% 1015 mb
Low level cloud: 38%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
56%
0.0 In
18:00

W
W

5 / 9 mph 56 / 55°F 85% 1021 mb
Low level cloud: 73%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 27
Mar
00:00

SW
SW

12 / 24 mph 52 / 48°F 83% 1014 mb
Low level cloud: 94%
Mid level cloud: 77%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

10 / 20 mph 45 / 40°F 93% 1011 mb
Low level cloud: 89%
Mid level cloud: 10%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

15 / 30 mph 50 / 44°F 77% 1017 mb
Low level cloud: 84%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: low
91%
0.1 In
18:00

WNW
WNW

12 / 24 mph 50 / 45°F 69% 1011 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
0.1 In
Sat 28
Mar
00:00

W
W

11 / 22 mph 44 / 38°F 71% 1023 mb
Low level cloud: 42%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: low
62%
0.0 In
06:00

WNW
WNW

13 / 26 mph 41 / 34°F 83% 1008 mb
Low level cloud: 94%
Mid level cloud: 47%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

16 / 33 mph 49 / 43°F 57% 1022 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 10%
Most Significant Cloud Type: medium
26%
0.0 In
18:00

SW
SW

14 / 29 mph 47 / 41°F 65% 999 mb
Low level cloud: 68%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.1 In
Sun 29
Mar
00:00

SSW
SSW

16 / 33 mph 44 / 37°F 74% 1008 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

17 / 35 mph 35 / 26°F 94% 979 mb
Low level cloud: 91%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

14 / 30 mph 44 / 37°F 79% 988 mb
Low level cloud: 75%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.3 In
18:00

WSW
WSW

18 / 37 mph 39 / 30°F 75% 973 mb
Low level cloud: 91%
Mid level cloud: 72%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
Mon 30
Mar
00:00

SSW
SSW

10 / 20 mph 40 / 33°F 96% 981 mb
Low level cloud: 97%
Mid level cloud: 83%
High level cloud: 62%
Most Significant Cloud Type: low
100%
0.2 In
06:00

SSW
SSW

9 / 20 mph 36 / 29°F 89% 975 mb
Low level cloud: 49%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.2 In
12:00

W
W

9 / 19 mph 43 / 38°F 77% 983 mb
Low level cloud: 64%
Mid level cloud: 43%
High level cloud: 7%
Most Significant Cloud Type: low
79%
0.2 In
18:00

WSW
WSW

12 / 24 mph 41 / 34°F 84% 974 mb
Low level cloud: 37%
Mid level cloud: 98%
High level cloud: 33%
Most Significant Cloud Type: low
75%
0.1 In
Tue 31
Mar
00:00

SSE
SSE

4 / 9 mph 44 / 42°F 91% 987 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
8%
0.0 In
06:00

WNW
WNW

10 / 20 mph 38 / 31°F 90% 982 mb
Low level cloud: 25%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: low
35%
0.3 In
12:00

SSE
SSE

8 / 16 mph 50 / 47°F 51% 988 mb
Low level cloud: 14%
Mid level cloud: 27%
High level cloud: 13%
Most Significant Cloud Type: low
24%
0.0 In
18:00

WNW
WNW

6 / 12 mph 49 / 47°F 76% 987 mb
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
13%
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