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Roundup 14 Day Long Range Forecast

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

Montana, United States Of America

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

The next 14 day outlook for Roundup shows the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 33°C expected on the afternoon of Tuesday 4th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Thursday 30th at 6°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Predictions are Wednesday 5th will have the most precipitation with an accumulation of around 11.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the morning of Wednesday 29th, coming from a westerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 27
May
02:00

W
W

10 / 21 mph 47 / 42°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 57%
High level cloud: 2%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

W
W

5 / 11 mph 45 / 42°F 57% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

7 / 8 mph 59 / 56°F 41% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

4 / 4 mph 66 / 63°F 34% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

3 / 3 mph 69 / 67°F 30% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

N
N

6 / 6 mph 71 / 68°F 32% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 33%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NNE
NNE

7 / 15 mph 58 / 55°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SE
SE

4 / 8 mph 53 / 53°F 49% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
20:00

ESE
ESE

11 / 22 mph 66 / 64°F 52% 1009 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
23:00

SE
SE

14 / 29 mph 61 / 61°F 53% 1007 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
Wed 29
May
02:00

WNW
WNW

3 / 6 mph 55 / 56°F 63% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 53%
Most Significant Cloud Type: high
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SSW
SSW

4 / 9 mph 57 / 56°F 61% 1005 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

11 / 12 mph 71 / 69°F 49% 1005 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

N
N

13 / 15 mph 75 / 76°F 45% 1005 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 33%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NNE
NNE

16 / 18 mph 73 / 76°F 47% 1005 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

28 / 36 mph 50 / 42°F 82% 1011 mb
Low level cloud: 4%
Mid level cloud: 42%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

NNW
NNW

10 / 12 mph 51 / 46°F 83% 1012 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

6 / 12 mph 50 / 47°F 60% 1013 mb
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
Thu 30
May
02:00

WSW
WSW

17 / 29 mph 46 / 39°F 60% 1014 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 33%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

19 / 28 mph 45 / 37°F 61% 1015 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 94%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

W
W

28 / 32 mph 52 / 45°F 42% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WNW
WNW

23 / 26 mph 56 / 51°F 41% 1014 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

16 / 18 mph 62 / 60°F 37% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

12 / 13 mph 64 / 63°F 32% 1012 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WNW
WNW

9 / 18 mph 53 / 49°F 46% 1014 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
23:00

WSW
WSW

4 / 8 mph 47 / 46°F 47% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 5%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
02:00

SW
SW

5 / 10 mph 47 / 45°F 46% 1015 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 99%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SW
SW

6 / 11 mph 49 / 47°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 93%
High level cloud: 42%
Most Significant Cloud Type: medium
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SW
SW

6 / 7 mph 57 / 56°F 39% 1014 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SSW
SSW

11 / 13 mph 66 / 64°F 31% 1012 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

13 / 14 mph 61 / 60°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

ESE
ESE

2 / 2 mph 62 / 59°F 59% 1010 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 9%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

S
S

7 / 14 mph 55 / 52°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSW
SSW

3 / 6 mph 51 / 50°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun
02:00

SW
SW

6 / 13 mph 49 / 47°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

5 / 11 mph 50 / 48°F 71% 1008 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 26%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SW
SW

8 / 9 mph 63 / 61°F 54% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

S
S

5 / 6 mph 73 / 69°F 40% 1004 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 16%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SSE
SSE

6 / 7 mph 77 / 75°F 34% 1002 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 21%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

N
N

7 / 8 mph 65 / 62°F 60% 1003 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 77%
Most Significant Cloud Type: medium
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
20:00

NNE
NNE

11 / 15 mph 55 / 51°F 90% 1005 mb
Low level cloud: 32%
Mid level cloud: 46%
High level cloud: 51%
Most Significant Cloud Type: low
54%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

WNW
WNW

9 / 11 mph 53 / 50°F 88% 1005 mb
Low level cloud: 12%
Mid level cloud: 88%
High level cloud: 86%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Jun
02:00

W
W

10 / 16 mph 52 / 48°F 83% 1006 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 12%
Most Significant Cloud Type: medium
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
05:00

WSW
WSW

11 / 19 mph 50 / 46°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

10 / 12 mph 61 / 60°F 51% 1008 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 28%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NW
NW

13 / 15 mph 66 / 65°F 38% 1007 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 18%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WNW
WNW

17 / 20 mph 68 / 67°F 36% 1007 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 14%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

13 / 15 mph 69 / 67°F 36% 1008 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

NW
NW

2 / 5 mph 57 / 56°F 57% 1010 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

2 / 5 mph 53 / 54°F 59% 1011 mb
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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 03
Jun
05:00

SW
SW

6 / 13 mph 53 / 52°F 59% 1012 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 5%
Most Significant Cloud Type: medium
22%
0.0 In
11:00

WSW
WSW

9 / 15 mph 84 / 81°F 23% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
17:00

NNW
NNW

12 / 16 mph 84 / 82°F 25% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
23:00

S
S

3 / 7 mph 63 / 63°F 53% 1006 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
0.0 In
Tue 04
Jun
05:00

SW
SW

5 / 11 mph 61 / 61°F 51% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
0.0 In
11:00

SW
SW

6 / 11 mph 80 / 80°F 36% 1008 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
0.0 In
17:00

NE
NE

7 / 11 mph 79 / 78°F 30% 1010 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
23:00

N
N

6 / 12 mph 68 / 68°F 59% 1004 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 05
Jun
05:00

SE
SE

5 / 10 mph 56 / 55°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
11:00

NNE
NNE

6 / 11 mph 71 / 71°F 59% 1007 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
0.1 In
17:00

ESE
ESE

14 / 22 mph 80 / 80°F 37% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
23:00

NW
NW

7 / 14 mph 60 / 60°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.3 In
Thu 06
Jun
05:00

ESE
ESE

5 / 11 mph 57 / 56°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
11:00

SE
SE

9 / 17 mph 72 / 76°F 44% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: medium
9%
0.0 In
17:00

WNW
WNW

9 / 19 mph 72 / 76°F 52% 1010 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
23:00

SSE
SSE

6 / 13 mph 63 / 63°F 61% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Fri 07
Jun
05:00

NNW
NNW

18 / 30 mph 61 / 61°F 81% 1022 mb
Low level cloud: 88%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
11:00

SE
SE

8 / 16 mph 81 / 81°F 39% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
17:00

NNW
NNW

17 / 29 mph 72 / 75°F 39% 1023 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
23:00

SSW
SSW

6 / 12 mph 72 / 72°F 57% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 08
Jun
05:00

WNW
WNW

5 / 10 mph 53 / 52°F 58% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
11:00

W
W

19 / 36 mph 94 / 90°F 20% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
17:00

N
N

13 / 21 mph 75 / 76°F 35% 1025 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
23:00

W
W

9 / 18 mph 70 / 70°F 37% 1005 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 09
Jun
05:00

NW
NW

3 / 6 mph 55 / 55°F 71% 1026 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
11:00

NW
NW

16 / 31 mph 57 / 54°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
0.0 In
17:00

N
N

11 / 18 mph 78 / 77°F 30% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.0 In
23:00

WNW
WNW

18 / 35 mph 56 / 52°F 52% 1019 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
0.0 In
Mon 10
Jun
05:00

WNW
WNW

13 / 26 mph 61 / 62°F 53% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 22%
Most Significant Cloud Type: medium
8%
0.0 In
11:00

NNW
NNW

28 / 55 mph 63 / 63°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.0 In
17:00

NNW
NNW

24 / 40 mph 72 / 74°F 31% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 13%
Most Significant Cloud Type: medium
18%
0.0 In
23:00

WNW
WNW

7 / 15 mph 51 / 48°F 55% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 11
Jun
05:00

N
N

7 / 13 mph 55 / 53°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 15%
Most Significant Cloud Type: medium
31%
0.0 In
11:00

NNW
NNW

11 / 21 mph 68 / 68°F 30% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
0.0 In
17:00

NNE
NNE

16 / 26 mph 69 / 69°F 35% 1012 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 4%
Most Significant Cloud Type: medium
27%
0.0 In
23:00

S
S

6 / 12 mph 58 / 57°F 45% 1011 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In

Other Locations Near to Roundup

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