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Corglass 14 Day Long Range Forecast

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

Leitrim, Ireland

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

Taking a look at Corglass over the coming two weeks and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 18°C expected on the afternoon of Sunday 2nd. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Sunday 2nd at 4°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Predictions are Sunday 26th 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		HumidityCloud AmountPrecip AmountWeather
Sun 26
May		03:00

E
E

 4 / 7 mph 49 / 47°F 99%
Low level cloud: 89%
Mid level cloud: 75%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 3 / 4 mph 49 / 49°F 99%
Low level cloud: 85%
Mid level cloud: 82%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 1 / 1 mph 50 / 50°F 99%
Low level cloud: 98%
Mid level cloud: 97%
High level cloud: 61%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 2 / 2 mph 52 / 51°F 97%
Low level cloud: 82%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 3 / 4 mph 54 / 54°F 94%
Low level cloud: 79%
Mid level cloud: 67%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 7 / 11 mph 51 / 49°F 98%
Low level cloud: 82%
Mid level cloud: 77%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 7 / 12 mph 48 / 44°F 97%
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		00:00

WSW
WSW

 5 / 9 mph 46 / 43°F 95%
Low level cloud: 15%
Mid level cloud: 50%
High level cloud: 11%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 3 / 7 mph 40 / 38°F 99%
Low level cloud: 37%
Mid level cloud: 30%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 3 / 5 mph 45 / 44°F 98%
Low level cloud: 83%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 7 / 8 mph 52 / 50°F 93%
Low level cloud: 92%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 8 / 11 mph 52 / 49°F 95%
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 9%
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 58 / 55°F 88%
Low level cloud: 55%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

 7 / 9 mph 59 / 56°F 70%
Low level cloud: 24%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 4 / 9 mph 47 / 44°F 94%
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		00:00

SSE
SSE

 4 / 7 mph 45 / 43°F 98%
Low level cloud: 52%
Mid level cloud: 5%
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

ESE
ESE

 5 / 8 mph 47 / 45°F 99%
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

SSE
SSE

 6 / 9 mph 52 / 49°F 100%
Low level cloud: 100%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

 8 / 12 mph 55 / 53°F 97%
Low level cloud: 95%
Mid level cloud: 31%
High level cloud: 81%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 10 / 13 mph 63 / 61°F 86%
Low level cloud: 51%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 13 / 17 mph 63 / 62°F 77%
Low level cloud: 46%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

 11 / 13 mph 58 / 55°F 79%
Low level cloud: 29%
Mid level cloud: 43%
High level cloud: 6%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 10 / 15 mph 52 / 49°F 87%
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May		00:00

WSW
WSW

 9 / 13 mph 51 / 48°F 90%
Low level cloud: 96%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 7 / 11 mph 51 / 48°F 91%
Low level cloud: 88%
Mid level cloud: 84%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 8 / 13 mph 51 / 48°F 98%
Low level cloud: 99%
Mid level cloud: 78%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 10 / 15 mph 53 / 50°F 97%
Low level cloud: 97%
Mid level cloud: 41%
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

WNW
WNW

 9 / 12 mph 59 / 56°F 88%
Low level cloud: 11%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

 12 / 15 mph 63 / 61°F 71%
Low level cloud: 22%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 11 / 14 mph 58 / 55°F 78%
Low level cloud: 29%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 9 / 15 mph 52 / 49°F 88%
Low level cloud: 84%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May		00:00

NW
NW

 9 / 13 mph 53 / 50°F 87%
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 10 / 15 mph 51 / 48°F 88%
Low level cloud: 96%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 11 / 16 mph 49 / 44°F 83%
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 12 / 13 mph 53 / 49°F 67%
Low level cloud: 79%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 13 / 15 mph 58 / 55°F 55%
Low level cloud: 46%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 13 / 15 mph 59 / 56°F 55%
Low level cloud: 6%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 11 / 12 mph 55 / 51°F 73%
Low level cloud: 30%
Mid level cloud: 96%
High level cloud: 16%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 9 / 12 mph 52 / 47°F 81%
Low level cloud: 52%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May		00:00

WNW
WNW

 6 / 11 mph 48 / 45°F 91%
Low level cloud: 50%
Mid level cloud: 71%
High level cloud: 7%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 6 / 9 mph 49 / 46°F 90%
Low level cloud: 96%
Mid level cloud: 57%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 6 / 9 mph 53 / 49°F 86%
Low level cloud: 43%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 9 / 11 mph 58 / 54°F 67%
Low level cloud: 32%
Mid level cloud: 29%
High level cloud: 7%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 11 / 13 mph 61 / 60°F 56%
Low level cloud: 63%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 11 / 13 mph 61 / 59°F 52%
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 10 / 11 mph 57 / 53°F 64%
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 8 / 12 mph 51 / 47°F 67%
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun		00:00

NNW
NNW

 7 / 10 mph 51 / 48°F 67%
Low level cloud: 79%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 5 / 8 mph 49 / 47°F 79%
Low level cloud: 35%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 5 / 6 mph 50 / 48°F 82%
Low level cloud: 29%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 7 / 8 mph 54 / 50°F 71%
Low level cloud: 41%
Mid level cloud: 61%
High level cloud: 1%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 6 / 6 mph 53 / 51°F 78%
Low level cloud: 96%
Mid level cloud: 86%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 7 / 9 mph 52 / 50°F 88%
Low level cloud: 89%
Mid level cloud: 94%
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

NW
NW

 5 / 7 mph 51 / 49°F 95%
Low level cloud: 93%
Mid level cloud: 67%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 4 / 9 mph 47 / 45°F 97%
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Sun 02
Jun		00:00

WSW
WSW

 5 / 10 mph 54 / 53°F 95%
Low level cloud: 94%
Mid level cloud: 78%
High level cloud: 61%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

 6 / 13 mph 55 / 54°F 86%
Low level cloud: 91%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: low
94%
0.0 In
12:00

NNW
NNW

 8 / 16 mph 63 / 63°F 75%
Low level cloud: 94%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: low
97%
0.0 In
18:00

NNW
NNW

 7 / 15 mph 66 / 66°F 68%
Low level cloud: 28%
Mid level cloud: 2%
High level cloud: 84%
Most Significant Cloud Type: low
38%
0.0 In
Mon 03
Jun		00:00

NW
NW

 5 / 11 mph 53 / 51°F 98%
Low level cloud: 94%
Mid level cloud: 98%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 5 / 10 mph 54 / 53°F 99%
Low level cloud: 98%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

 11 / 24 mph 56 / 53°F 71%
Low level cloud: 79%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
18:00

NW
NW

 9 / 18 mph 59 / 59°F 65%
Low level cloud: 1%
Mid level cloud: 54%
High level cloud: 31%
Most Significant Cloud Type: medium
58%
0.0 In
Tue 04
Jun		00:00

NW
NW

 10 / 22 mph 51 / 47°F 86%
Low level cloud: 81%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
06:00

WSW
WSW

 4 / 9 mph 46 / 44°F 92%
Low level cloud: 38%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
50%
0.0 In
12:00

NW
NW

 10 / 21 mph 58 / 56°F 70%
Low level cloud: 82%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
87%
0.0 In
18:00

WNW
WNW

 9 / 18 mph 55 / 53°F 80%
Low level cloud: 74%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
Wed 05
Jun		00:00

NW
NW

 6 / 12 mph 50 / 47°F 90%
Low level cloud: 92%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: low
97%
0.0 In
06:00

WNW
WNW

 6 / 12 mph 51 / 48°F 87%
Low level cloud: 40%
Mid level cloud: 2%
High level cloud: 50%
Most Significant Cloud Type: low
46%
0.0 In
12:00

NW
NW

 4 / 8 mph 67 / 67°F 42%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 8%
Most Significant Cloud Type: medium
17%
0.0 In
18:00

WNW
WNW

 5 / 10 mph 55 / 54°F 78%
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
97%
0.0 In
Thu 06
Jun		00:00

NW
NW

 1 / 2 mph 48 / 48°F 73%
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 70%
Most Significant Cloud Type: medium
64%
0.0 In
06:00

WSW
WSW

 8 / 16 mph 54 / 52°F 89%
Low level cloud: 99%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 7 / 14 mph 64 / 64°F 50%
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

WSW
WSW

 9 / 18 mph 56 / 54°F 78%
Low level cloud: 92%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Fri 07
Jun		00:00

NNW
NNW

 4 / 8 mph 43 / 41°F 94%
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
2%
0.0 In
06:00

W
W

 6 / 12 mph 52 / 49°F 96%
Low level cloud: 94%
Mid level cloud: 14%
High level cloud: 64%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 4 / 7 mph 63 / 63°F 47%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
18:00

WSW
WSW

 6 / 13 mph 59 / 58°F 80%
Low level cloud: 92%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
94%
0.0 In
Sat 08
Jun		00:00

WNW
WNW

 1 / 2 mph 44 / 44°F 94%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 65%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

SSW
SSW

 5 / 10 mph 52 / 51°F 93%
Low level cloud: 56%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.0 In
12:00

SW
SW

 8 / 16 mph 60 / 60°F 82%
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 54%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 7 / 14 mph 59 / 58°F 77%
Low level cloud: 96%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
Sun 09
Jun		00:00

SSW
SSW

 6 / 14 mph 55 / 54°F 96%
Low level cloud: 69%
Mid level cloud: 53%
High level cloud: 3%
Most Significant Cloud Type: low
87%
0.0 In
06:00

WSW
WSW

 4 / 9 mph 50 / 49°F 86%
Low level cloud: 98%
Mid level cloud: 84%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 8 / 17 mph 59 / 59°F 95%
Low level cloud: 100%
Mid level cloud: 55%
High level cloud: 90%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 4 / 8 mph 53 / 52°F 99%
Low level cloud: 89%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Mon 10
Jun		00:00

SW
SW

 10 / 21 mph 58 / 56°F 99%
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
06:00

S
S

 6 / 13 mph 46 / 43°F 99%
Low level cloud: 81%
Mid level cloud: 31%
High level cloud: 3%
Most Significant Cloud Type: low
92%
0.0 In
12:00

W
W

 9 / 18 mph 60 / 60°F 92%
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 8%
Most Significant Cloud Type: low
89%
0.0 In
18:00

SW
SW

 9 / 20 mph 54 / 51°F 73%
Low level cloud: 47%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
63%
0.1 In

Other Locations Near to Corglass

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