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Grassendale 14 Day Long Range Forecast

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

Knowsley, United Kingdom

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

Reviewing the forecast for Grassendale Over the next 14 days and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 21°C expected on the afternoon of Saturday 21st. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 26th at 5°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 24th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 21
Apr
03:00

W
W

1 / 5 mph 42 / 42°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WNW
WNW

2 / 5 mph 42 / 42°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

S
S

3 / 2 mph 57 / 56°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

S
S

6 / 2 mph 63 / 61°F 67% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SSW
SSW

9 / 2 mph 63 / 61°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

SW
SW

9 / 2 mph 58 / 55°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

10 / 4 mph 47 / 42°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 22
Apr
00:00

SW
SW

11 / 4 mph 48 / 44°F 96% 1013 mb
Low level cloud: 74%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
03:00

W
W

9 / 4 mph 47 / 43°F 96% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
06:00

W
W

10 / 4 mph 45 / 40°F 92% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

10 / 3 mph 51 / 47°F 85% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

15 / 3 mph 54 / 50°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

17 / 3 mph 54 / 49°F 82% 1013 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

15 / 3 mph 53 / 47°F 78% 1014 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

10 / 4 mph 47 / 42°F 82% 1016 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 23
Apr
00:00

W
W

10 / 4 mph 44 / 39°F 88% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

11 / 4 mph 44 / 39°F 90% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SW
SW

13 / 4 mph 46 / 40°F 93% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SW
SW

16 / 3 mph 52 / 46°F 92% 1016 mb
Low level cloud: 30%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

SW
SW

22 / 3 mph 55 / 49°F 93% 1016 mb
Low level cloud: 86%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

22 / 3 mph 56 / 50°F 94% 1015 mb
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

20 / 3 mph 55 / 50°F 93% 1015 mb
Low level cloud: 19%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

15 / 3 mph 53 / 48°F 96% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
Tue 24
Apr
00:00

WSW
WSW

15 / 4 mph 49 / 44°F 97% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

9 / 5 mph 47 / 43°F 97% 1014 mb
Low level cloud: 46%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
06:00

W
W

4 / 5 mph 46 / 44°F 95% 1014 mb
Low level cloud: 91%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.07 In of precipitation over the past 3 hours.
0.07 In
09:00

NW
NW

3 / 4 mph 50 / 49°F 94% 1014 mb
Low level cloud: 56%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.05 In of precipitation over the past 3 hours.
0.05 In
12:00

WSW
WSW

3 / 3 mph 54 / 53°F 85% 1014 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

WSW
WSW

7 / 3 mph 55 / 53°F 84% 1014 mb
Low level cloud: 82%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WSW
WSW

10 / 3 mph 54 / 50°F 83% 1013 mb
Low level cloud: 3%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
21:00

W
W

12 / 3 mph 50 / 46°F 91% 1015 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 25
Apr
00:00

W
W

12 / 4 mph 47 / 42°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

13 / 4 mph 45 / 39°F 89% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

15 / 4 mph 44 / 37°F 85% 1015 mb
Low level cloud: 5%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
63%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

17 / 4 mph 48 / 41°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

19 / 4 mph 51 / 45°F 67% 1017 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

W
W

22 / 3 mph 53 / 46°F 68% 1017 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

W
W

16 / 3 mph 51 / 45°F 75% 1017 mb
Low level cloud: 5%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
21:00

W
W

16 / 3 mph 48 / 42°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 26
Apr
00:00

W
W

16 / 3 mph 46 / 39°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

17 / 4 mph 44 / 37°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

15 / 4 mph 43 / 36°F 77% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

15 / 4 mph 46 / 40°F 67% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

15 / 4 mph 49 / 43°F 61% 1024 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

WNW
WNW

17 / 4 mph 51 / 45°F 64% 1025 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WNW
WNW

13 / 4 mph 49 / 44°F 71% 1026 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

11 / 3 mph 47 / 42°F 77% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 27
Apr
00:00

W
W

10 / 3 mph 47 / 43°F 78% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

7 / 4 mph 45 / 41°F 76% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

SSW
SSW

9 / 4 mph 44 / 39°F 76% 1026 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

S
S

17 / 3 mph 48 / 41°F 86% 1024 mb
Low level cloud: 97%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
12:00

SSW
SSW

23 / 2 mph 52 / 45°F 93% 1022 mb
Low level cloud: 97%
Mid level cloud: 89%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.16 In of precipitation over the past 3 hours.
0.16 In
15:00

SW
SW

23 / 3 mph 54 / 48°F 93% 1021 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.10 In of precipitation over the past 3 hours.
0.10 In
18:00

SW
SW

19 / 3 mph 52 / 46°F 94% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

SW
SW

17 / 4 mph 49 / 43°F 94% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 28
Apr
00:00

SSW
SSW

8 / 10 mph 46 / 42°F 83% 1014 mb
Low level cloud: 29%
Mid level cloud: 77%
High level cloud: 84%
Most Significant Cloud Type: low
65%
0.00 In
06:00

SE
SE

4 / 5 mph 48 / 46°F 93% 1007 mb
Low level cloud: 90%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.07 In
12:00

SW
SW

14 / 17 mph 52 / 47°F 74% 1006 mb
Low level cloud: 92%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.06 In
18:00

WNW
WNW

14 / 20 mph 46 / 40°F 83% 1005 mb
Low level cloud: 90%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.07 In
Sun 29
Apr
00:00

WNW
WNW

9 / 15 mph 45 / 40°F 86% 1004 mb
Low level cloud: 60%
Mid level cloud: 27%
High level cloud: 46%
Most Significant Cloud Type: low
74%
0.00 In
06:00

NW
NW

10 / 15 mph 44 / 38°F 84% 1011 mb
Low level cloud: 89%
Mid level cloud: 69%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.07 In
12:00

WNW
WNW

13 / 17 mph 51 / 46°F 61% 1004 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: low
10%
0.04 In
18:00

W
W

8 / 10 mph 52 / 49°F 74% 1009 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
44%
0.03 In
Mon 30
Apr
00:00

WNW
WNW

7 / 9 mph 45 / 41°F 91% 1004 mb
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.01 In
06:00

SSE
SSE

15 / 28 mph 39 / 31°F 89% 1002 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 40%
Most Significant Cloud Type: low
67%
0.00 In
12:00

NW
NW

16 / 20 mph 48 / 42°F 75% 1004 mb
Low level cloud: 53%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.02 In
18:00

S
S

13 / 19 mph 50 / 45°F 91% 994 mb
Low level cloud: 65%
Mid level cloud: 51%
High level cloud: 55%
Most Significant Cloud Type: low
89%
0.16 In
Tue 01
May
00:00

N
N

9 / 11 mph 47 / 42°F 91% 1007 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 13%
Most Significant Cloud Type: medium
24%
0.03 In
06:00

SSE
SSE

15 / 26 mph 39 / 31°F 90% 991 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.14 In
12:00

N
N

14 / 22 mph 45 / 39°F 75% 1015 mb
Low level cloud: 70%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.02 In
18:00

SSE
SSE

17 / 30 mph 50 / 44°F 81% 989 mb
Low level cloud: 4%
Mid level cloud: 14%
High level cloud: 38%
Most Significant Cloud Type: medium
27%
0.16 In
Wed 02
May
00:00

NE
NE

2 / 3 mph 47 / 47°F 85% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
3%
0.03 In
06:00

SSE
SSE

17 / 25 mph 45 / 38°F 88% 992 mb
Low level cloud: 49%
Mid level cloud: 19%
High level cloud: 12%
Most Significant Cloud Type: low
56%
0.01 In
12:00

W
W

9 / 10 mph 51 / 48°F 63% 1024 mb
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
35%
0.00 In
18:00

S
S

11 / 19 mph 52 / 48°F 80% 996 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 51%
Most Significant Cloud Type: medium
28%
0.17 In
Thu 03
May
00:00

SW
SW

8 / 15 mph 42 / 37°F 90% 1026 mb
Low level cloud: 48%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: low
68%
0.00 In
06:00

SSE
SSE

16 / 23 mph 45 / 38°F 89% 998 mb
Low level cloud: 30%
Mid level cloud: 43%
High level cloud: 57%
Most Significant Cloud Type: low
52%
0.00 In
12:00

NW
NW

12 / 17 mph 52 / 48°F 84% 1027 mb
Low level cloud: 58%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: low
64%
0.04 In
18:00

SSW
SSW

14 / 24 mph 52 / 47°F 74% 1001 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: medium
9%
0.12 In
Fri 04
May
00:00

NNW
NNW

5 / 6 mph 51 / 49°F 88% 1034 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
9%
0.00 In
06:00

S
S

6 / 7 mph 46 / 43°F 94% 1010 mb
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
29%
0.00 In
12:00

NNW
NNW

6 / 7 mph 61 / 61°F 60% 1035 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
0.00 In
18:00

NNE
NNE

8 / 10 mph 58 / 57°F 74% 1013 mb
Low level cloud: 5%
Mid level cloud: 16%
High level cloud: 37%
Most Significant Cloud Type: medium
32%
0.00 In
Sat 05
May
00:00

NE
NE

3 / 3 mph 54 / 54°F 85% 1036 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.00 In
06:00

NE
NE

11 / 14 mph 49 / 44°F 82% 1015 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 38%
Most Significant Cloud Type: medium
33%
0.00 In
12:00

NE
NE

11 / 13 mph 62 / 62°F 59% 1033 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.00 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