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Lake Grace 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Lake Grace

Western Australia, Australia

Long range weather outlook for Lake Grace includes 14 day forecast summary:

The forecast for Lake Grace in the coming two weeks is predicting the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 25°C expected on the afternoon of Saturday 1st. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Thursday 30th at 6°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The current forecast indicates Sunday 2nd will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May		20:00

WSW
WSW

 9 / 16 mph 61 / 61°F 76% 1020 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

 6 / 12 mph 56 / 55°F 85% 1021 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
Sun 26
May		02:00

W
W

 2 / 4 mph 54 / 55°F 87% 1022 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NNW
NNW

 3 / 7 mph 52 / 52°F 88% 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
08:00

NNW
NNW

 5 / 9 mph 55 / 53°F 83% 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
11:00

NW
NW

 11 / 13 mph 68 / 67°F 57% 1022 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

 15 / 17 mph 73 / 76°F 43% 1019 mb
Low level cloud: 1%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 9 / 16 mph 68 / 67°F 48% 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
20:00

W
W

 8 / 14 mph 63 / 64°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

 7 / 13 mph 56 / 55°F 89% 1021 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 5%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		02:00

WNW
WNW

 4 / 9 mph 54 / 53°F 89% 1021 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NW
NW

 5 / 10 mph 52 / 51°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNW
NNW

 4 / 8 mph 55 / 54°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 11%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NW
NW

 6 / 8 mph 67 / 66°F 53% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

 11 / 13 mph 73 / 75°F 37% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 6%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 7 / 14 mph 66 / 65°F 47% 1016 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 9%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

 5 / 10 mph 57 / 57°F 72% 1016 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
23:00

WSW
WSW

 5 / 11 mph 55 / 54°F 91% 1015 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		02:00

WNW
WNW

 5 / 9 mph 54 / 53°F 96% 1014 mb
Low level cloud: 34%
Mid level cloud: 9%
High level cloud: 43%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

 6 / 11 mph 53 / 51°F 96% 1013 mb
Low level cloud: 51%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

 6 / 9 mph 54 / 51°F 92% 1013 mb
Low level cloud: 39%
Mid level cloud: 32%
High level cloud: 21%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

 12 / 14 mph 62 / 61°F 66% 1012 mb
Low level cloud: 51%
Mid level cloud: 43%
High level cloud: 10%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

 14 / 19 mph 58 / 55°F 79% 1009 mb
Low level cloud: 23%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

WNW
WNW

 15 / 24 mph 61 / 60°F 57% 1008 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

W
W

 15 / 21 mph 54 / 50°F 77% 1010 mb
Low level cloud: 28%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

 15 / 21 mph 52 / 47°F 73% 1011 mb
Low level cloud: 21%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		02:00

W
W

 14 / 21 mph 48 / 43°F 70% 1011 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

 16 / 21 mph 47 / 40°F 71% 1013 mb
Low level cloud: 21%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

W
W

 12 / 17 mph 46 / 40°F 71% 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
11:00

W
W

 22 / 25 mph 56 / 50°F 44% 1014 mb
Low level cloud: 4%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

 19 / 22 mph 56 / 51°F 50% 1014 mb
Low level cloud: 31%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

 13 / 18 mph 53 / 49°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

W
W

 6 / 12 mph 46 / 43°F 75% 1019 mb
Low level cloud: 3%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

 7 / 12 mph 46 / 42°F 79% 1019 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May		02:00

WNW
WNW

 6 / 11 mph 47 / 44°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NW
NW

 6 / 13 mph 44 / 40°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

 7 / 13 mph 46 / 42°F 73% 1021 mb
Low level cloud: 8%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NW
NW

 12 / 15 mph 54 / 50°F 59% 1021 mb
Low level cloud: 41%
Mid level cloud: 55%
High level cloud: 50%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

 13 / 16 mph 58 / 55°F 55% 1018 mb
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 90%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

 12 / 19 mph 57 / 53°F 62% 1018 mb
Low level cloud: 4%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

 8 / 17 mph 51 / 47°F 83% 1020 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NW
NW

 9 / 19 mph 50 / 46°F 87% 1020 mb
Low level cloud: 1%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May		02:00

NNW
NNW

 9 / 19 mph 49 / 45°F 88% 1019 mb
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NNW
NNW

 10 / 21 mph 49 / 44°F 87% 1019 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNW
NNW

 13 / 21 mph 52 / 47°F 74% 1020 mb
Low level cloud: 3%
Mid level cloud: 23%
High level cloud: 18%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NW
NW

 18 / 21 mph 64 / 64°F 48% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 65%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

 18 / 21 mph 68 / 67°F 40% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 34%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NNW
NNW

 12 / 21 mph 63 / 62°F 44% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 82%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NNW
NNW

 10 / 20 mph 57 / 55°F 49% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNW
NNW

 8 / 17 mph 53 / 50°F 54% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 01
Jun		02:00

NNW
NNW

 17 / 26 mph 58 / 54°F 80% 1009 mb
Low level cloud: 39%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: low
41%
0.0 In
08:00

NNW
NNW

 18 / 27 mph 55 / 50°F 86% 1009 mb
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
14:00

NW
NW

 23 / 32 mph 75 / 75°F 27% 1009 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
20:00

WNW
WNW

 7 / 15 mph 65 / 65°F 47% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Sun 02
Jun		02:00

N
N

 8 / 16 mph 60 / 60°F 55% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
08:00

NNW
NNW

 7 / 15 mph 61 / 61°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
14:00

NNW
NNW

 20 / 30 mph 60 / 60°F 86% 999 mb
Low level cloud: 37%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
56%
0.0 In
20:00

ESE
ESE

 9 / 13 mph 55 / 52°F 93% 1011 mb
Low level cloud: 98%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Mon 03
Jun		02:00

NW
NW

 14 / 24 mph 52 / 47°F 71% 1005 mb
Low level cloud: 4%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
0.0 In
08:00

SSE
SSE

 5 / 8 mph 53 / 52°F 91% 1014 mb
Low level cloud: 84%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.4 In
14:00

NW
NW

 18 / 32 mph 58 / 54°F 61% 1000 mb
Low level cloud: 68%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: low
92%
0.0 In
20:00

SSW
SSW

 13 / 20 mph 55 / 51°F 84% 1017 mb
Low level cloud: 35%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.1 In
Tue 04
Jun		02:00

S
S

 14 / 27 mph 50 / 44°F 89% 1010 mb
Low level cloud: 61%
Mid level cloud: 47%
High level cloud: 18%
Most Significant Cloud Type: low
79%
0.3 In
08:00

S
S

 8 / 13 mph 52 / 49°F 87% 1021 mb
Low level cloud: 43%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
14:00

SSW
SSW

 13 / 24 mph 62 / 62°F 62% 1014 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
20:00

SE
SE

 6 / 11 mph 56 / 55°F 78% 1024 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
Wed 05
Jun		02:00

SW
SW

 9 / 16 mph 56 / 54°F 90% 1017 mb
Low level cloud: 77%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
08:00

E
E

 4 / 8 mph 51 / 49°F 91% 1027 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
14:00

S
S

 9 / 16 mph 67 / 67°F 50% 1017 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
20:00

NNE
NNE

 3 / 7 mph 56 / 57°F 68% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 06
Jun		02:00

NNE
NNE

 5 / 11 mph 53 / 51°F 84% 1018 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
08:00

NNE
NNE

 9 / 16 mph 51 / 47°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 34%
Most Significant Cloud Type: high
34%
0.0 In
14:00

NW
NW

 21 / 41 mph 67 / 67°F 48% 1010 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
20:00

NNW
NNW

 12 / 23 mph 57 / 55°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
Fri 07
Jun		02:00

NNW
NNW

 24 / 46 mph 61 / 61°F 78% 1001 mb
Low level cloud: 98%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
08:00

W
W

 16 / 26 mph 55 / 51°F 61% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
14:00

SSW
SSW

 17 / 33 mph 54 / 49°F 69% 1011 mb
Low level cloud: 31%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.3 In
20:00

W
W

 14 / 22 mph 58 / 55°F 67% 1020 mb
Low level cloud: 59%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
Sat 08
Jun		02:00

SW
SW

 6 / 13 mph 44 / 40°F 84% 1024 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
08:00

WSW
WSW

 8 / 13 mph 54 / 52°F 78% 1025 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
14:00

SSW
SSW

 11 / 21 mph 57 / 54°F 48% 1026 mb
Low level cloud: 34%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
20:00

W
W

 3 / 6 mph 57 / 58°F 66% 1027 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
Sun 09
Jun		02:00

WSW
WSW

 3 / 6 mph 45 / 44°F 83% 1030 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
08:00

NNE
NNE

 5 / 9 mph 49 / 47°F 77% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 83%
Most Significant Cloud Type: high
82%
0.0 In
14:00

NNE
NNE

 6 / 11 mph 60 / 60°F 48% 1027 mb
Low level cloud: 6%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
20:00

NNE
NNE

 6 / 12 mph 54 / 53°F 65% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
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