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Glenns Ferry 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Glenns Ferry

Idaho, United States Of America

Long range weather outlook for Glenns Ferry includes 14 day forecast summary:

Reviewing the forecast for Glenns Ferry Over the next 14 days and the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 28°C expected on the afternoon of Tuesday 28th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Thursday 23rd at 3°C. Expect the coming 14 days to have mixed weather with some days dry and some seeing a little rain. It looks like Wednesday 22nd will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 19
May
02:00

WNW
WNW

21 / 34 mph 51 / 44°F 43%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

15 / 26 mph 44 / 36°F 54%
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
08:00

WNW
WNW

19 / 21 mph 54 / 48°F 38%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

19 / 22 mph 59 / 55°F 31%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

18 / 21 mph 64 / 63°F 25%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

16 / 19 mph 64 / 63°F 25%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

7 / 15 mph 49 / 46°F 36%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

6 / 13 mph 44 / 41°F 40%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
02:00

W
W

7 / 14 mph 41 / 36°F 52%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

10 / 21 mph 38 / 32°F 58%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

15 / 17 mph 54 / 49°F 46%
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
11:00

WNW
WNW

20 / 23 mph 63 / 62°F 33%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

21 / 24 mph 67 / 66°F 25%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

W
W

16 / 18 mph 59 / 55°F 48%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WNW
WNW

14 / 26 mph 55 / 50°F 41%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NW
NW

9 / 19 mph 49 / 45°F 47%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 22%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
02:00

WNW
WNW

8 / 16 mph 44 / 40°F 56%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

7 / 15 mph 39 / 34°F 64%
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
08:00

W
W

11 / 13 mph 56 / 51°F 46%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

20 / 23 mph 66 / 65°F 31%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

17 / 19 mph 71 / 70°F 20%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

13 / 15 mph 73 / 72°F 17%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

N
N

4 / 9 mph 58 / 56°F 27%
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

7 / 15 mph 54 / 52°F 32%
Low level cloud: 0%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
02:00

WNW
WNW

12 / 14 mph 51 / 47°F 85%
Low level cloud: 9%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
05:00

W
W

10 / 12 mph 51 / 47°F 79%
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

13 / 15 mph 55 / 51°F 68%
Low level cloud: 1%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

W
W

12 / 14 mph 64 / 63°F 46%
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

15 / 18 mph 60 / 56°F 57%
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

10 / 12 mph 62 / 60°F 51%
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WNW
WNW

17 / 20 mph 50 / 44°F 65%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

11 / 21 mph 42 / 36°F 67%
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
Thu 23
May
02:00

W
W

9 / 18 mph 38 / 32°F 71%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

10 / 21 mph 37 / 30°F 68%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

18 / 21 mph 51 / 44°F 53%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

19 / 22 mph 58 / 53°F 42%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

17 / 19 mph 64 / 63°F 33%
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

14 / 16 mph 65 / 64°F 31%
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
20:00

W
W

8 / 17 mph 52 / 47°F 46%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

4 / 7 mph 44 / 43°F 59%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
02:00

E
E

2 / 4 mph 42 / 42°F 62%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 98%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

5 / 10 mph 42 / 40°F 59%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

E
E

8 / 9 mph 59 / 55°F 45%
Low level cloud: 0%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SSE
SSE

4 / 4 mph 68 / 65°F 32%
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 40%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

9 / 11 mph 70 / 67°F 29%
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSW
SSW

7 / 8 mph 72 / 69°F 29%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

5 / 10 mph 55 / 53°F 44%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 17%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

E
E

6 / 14 mph 51 / 49°F 48%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 21%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
02:00

E
E

7 / 14 mph 48 / 46°F 52%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

ENE
ENE

7 / 15 mph 51 / 48°F 47%
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

3 / 3 mph 65 / 62°F 42%
Low level cloud: 0%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

S
S

5 / 6 mph 69 / 68°F 37%
Low level cloud: 0%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

W
W

4 / 4 mph 76 / 75°F 32%
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 68%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

25 / 29 mph 60 / 59°F 71%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 48%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

14 / 16 mph 56 / 52°F 62%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

7 / 14 mph 46 / 42°F 70%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sun 26
May
05:00

W
W

7 / 11 mph 50 / 47°F 94%
Low level cloud: 81%
Mid level cloud: 94%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
11:00

WNW
WNW

19 / 24 mph 67 / 67°F 29%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
17:00

WNW
WNW

13 / 16 mph 72 / 72°F 21%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
23:00

NE
NE

1 / 2 mph 53 / 53°F 45%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 27
May
05:00

WNW
WNW

4 / 9 mph 39 / 35°F 82%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
9%
0.0 In
11:00

WNW
WNW

12 / 17 mph 71 / 71°F 30%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
0.0 In
17:00

WNW
WNW

14 / 20 mph 69 / 69°F 30%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
23:00

E
E

1 / 2 mph 54 / 54°F 41%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 28
May
05:00

E
E

2 / 4 mph 43 / 43°F 69%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: medium
3%
0.0 In
11:00

WNW
WNW

13 / 18 mph 73 / 74°F 28%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
0.0 In
17:00

SE
SE

6 / 9 mph 79 / 77°F 23%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
23:00

ENE
ENE

2 / 4 mph 57 / 58°F 40%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 29
May
05:00

E
E

7 / 15 mph 52 / 49°F 52%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
11:00

W
W

9 / 12 mph 76 / 76°F 28%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
17:00

E
E

21 / 29 mph 88 / 84°F 20%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 4%
Most Significant Cloud Type: medium
20%
0.0 In
23:00

ENE
ENE

3 / 6 mph 60 / 60°F 41%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 16%
Most Significant Cloud Type: high
15%
0.0 In
Thu 30
May
05:00

ENE
ENE

2 / 3 mph 53 / 53°F 71%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 34%
Most Significant Cloud Type: medium
10%
0.1 In
11:00

W
W

9 / 12 mph 76 / 76°F 33%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
17:00

NW
NW

21 / 34 mph 70 / 70°F 27%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: medium
1%
0.0 In
23:00

WNW
WNW

23 / 32 mph 52 / 46°F 67%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: medium
16%
0.0 In
Fri 31
May
05:00

ENE
ENE

2 / 5 mph 45 / 44°F 45%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
11:00

WNW
WNW

19 / 27 mph 57 / 53°F 42%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
17:00

WNW
WNW

26 / 40 mph 72 / 74°F 31%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
23:00

W
W

7 / 15 mph 46 / 42°F 40%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 01
Jun
05:00

W
W

11 / 18 mph 52 / 48°F 69%
Low level cloud: 0%
Mid level cloud: 66%
High level cloud: 99%
Most Significant Cloud Type: medium
69%
0.2 In
11:00

WNW
WNW

15 / 21 mph 60 / 60°F 27%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
17:00

NW
NW

11 / 19 mph 68 / 68°F 29%
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
23:00

E
E

2 / 4 mph 46 / 46°F 51%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 02
Jun
05:00

NNW
NNW

1 / 2 mph 45 / 45°F 66%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
11:00

SSW
SSW

2 / 2 mph 69 / 69°F 27%
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
0.0 In
17:00

NW
NW

8 / 13 mph 78 / 77°F 26%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
23:00

WNW
WNW

3 / 7 mph 55 / 55°F 42%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 46%
Most Significant Cloud Type: medium
46%
0.0 In
Mon 03
Jun
05:00

NE
NE

1 / 3 mph 53 / 53°F 51%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: medium
44%
0.0 In
11:00

W
W

16 / 22 mph 73 / 75°F 34%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
0.0 In
17:00

NW
NW

3 / 6 mph 90 / 86°F 17%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
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