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Thong Pha Phum 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Thong Pha Phum

Thailand

Long range weather outlook for Thong Pha Phum includes 14 day forecast summary:

The forecast for Thong Pha Phum in the coming two weeks is predicting the average daytime maximum temperature will be around 41°C, with a high for the two weeks of 44°C expected on the afternoon of Monday 29th. The average minimum temperature will be 20°C, dipping to its lowest on the morning of Sunday 28th at 18°C. Expect the coming 14 days to have mixed overhead conditions with some days dry and some seeing a significant amount of rain. It looks like Saturday 4th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 28
Apr
16:00

W
W

9 / 11 mph 109 / 111°F 16% 1004 mb
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
19:00

WNW
WNW

4 / 9 mph 83 / 83°F 42% 1006 mb
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
22:00

W
W

2 / 3 mph 72 / 76°F 74% 1010 mb
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 29
Apr
01:00

NW
NW

2 / 4 mph 69 / 69°F 89% 1010 mb
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
04:00

NW
NW

2 / 4 mph 65 / 65°F 99% 1010 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 3 mph 75 / 76°F 94% 1011 mb
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

4 / 4 mph 100 / 102°F 31% 1011 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
13:00

W
W

6 / 6 mph 111 / 115°F 15% 1007 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
16:00

W
W

10 / 12 mph 108 / 109°F 17% 1004 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

4 / 9 mph 82 / 82°F 41% 1006 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
22:00

SW
SW

2 / 3 mph 71 / 71°F 76% 1009 mb
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
Tue 30
Apr
01:00

WNW
WNW

2 / 4 mph 69 / 69°F 88% 1008 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
04:00

NW
NW

2 / 5 mph 65 / 65°F 99% 1008 mb
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 4 mph 76 / 77°F 91% 1009 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

5 / 5 mph 98 / 105°F 43% 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
13:00

WNW
WNW

7 / 8 mph 108 / 112°F 22% 1005 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

10 / 11 mph 106 / 109°F 23% 1002 mb
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
19:00

W
W

4 / 9 mph 81 / 82°F 53% 1005 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
22:00

W
W

3 / 6 mph 72 / 76°F 87% 1007 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
Wed 01
May
01:00

WNW
WNW

3 / 6 mph 67 / 67°F 99% 1007 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

2 / 4 mph 68 / 68°F 99% 1007 mb
Low level cloud: 72%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

3 / 3 mph 80 / 81°F 91% 1008 mb
Low level cloud: 38%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

5 / 6 mph 98 / 105°F 43% 1008 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

8 / 9 mph 106 / 112°F 27% 1005 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
16:00

W
W

10 / 12 mph 104 / 110°F 31% 1003 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

6 / 9 mph 83 / 86°F 54% 1005 mb
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
22:00

W
W

3 / 6 mph 72 / 77°F 88% 1007 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
Thu 02
May
01:00

WNW
WNW

3 / 5 mph 67 / 67°F 98% 1007 mb
Low level cloud: 31%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

2 / 5 mph 67 / 67°F 99% 1007 mb
Low level cloud: 65%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 3 mph 80 / 80°F 92% 1009 mb
Low level cloud: 52%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

4 / 5 mph 97 / 107°F 48% 1008 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

6 / 7 mph 107 / 115°F 28% 1005 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

10 / 11 mph 106 / 113°F 28% 1002 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

6 / 7 mph 87 / 92°F 57% 1005 mb
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
22:00

WSW
WSW

2 / 4 mph 73 / 77°F 84% 1007 mb
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
Fri 03
May
01:00

WNW
WNW

3 / 6 mph 68 / 68°F 96% 1008 mb
Low level cloud: 19%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

2 / 4 mph 67 / 67°F 99% 1008 mb
Low level cloud: 56%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 2 mph 81 / 82°F 89% 1009 mb
Low level cloud: 36%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

5 / 5 mph 97 / 107°F 49% 1009 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

6 / 7 mph 108 / 116°F 28% 1006 mb
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
16:00

WNW
WNW

10 / 12 mph 105 / 114°F 31% 1003 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
19:00

W
W

4 / 6 mph 85 / 89°F 57% 1006 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

2 / 5 mph 75 / 78°F 85% 1009 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May
01:00

W
W

2 / 4 mph 68 / 69°F 98% 1009 mb
Low level cloud: 30%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

2 / 4 mph 70 / 70°F 98% 1009 mb
Low level cloud: 60%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 2 mph 82 / 83°F 91% 1010 mb
Low level cloud: 49%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

5 / 6 mph 99 / 110°F 48% 1010 mb
Low level cloud: 18%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

6 / 7 mph 109 / 117°F 27% 1006 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

5 / 5 mph 103 / 113°F 38% 1003 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

3 / 6 mph 77 / 81°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

W
W

3 / 6 mph 73 / 77°F 93% 1009 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 05
May
01:00

WNW
WNW

2 / 4 mph 72 / 76°F 90% 1009 mb
Low level cloud: 42%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
07:00

WNW
WNW

3 / 3 mph 78 / 85°F 93% 1009 mb
Low level cloud: 57%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
59%
0.0 In
13:00

WNW
WNW

7 / 8 mph 107 / 110°F 22% 1006 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

W
W

6 / 8 mph 85 / 89°F 59% 1005 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Mon 06
May
01:00

WNW
WNW

2 / 5 mph 69 / 69°F 99% 1009 mb
Low level cloud: 53%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NW
NW

2 / 3 mph 76 / 80°F 90% 1010 mb
Low level cloud: 42%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
13:00

WNW
WNW

6 / 8 mph 107 / 113°F 25% 1006 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
19:00

W
W

5 / 8 mph 84 / 88°F 56% 1006 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Tue 07
May
01:00

WNW
WNW

2 / 4 mph 70 / 70°F 99% 1008 mb
Low level cloud: 58%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NW
NW

2 / 4 mph 77 / 82°F 90% 1011 mb
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
13:00

WNW
WNW

9 / 11 mph 100 / 111°F 40% 1007 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
19:00

W
W

3 / 7 mph 81 / 84°F 62% 1007 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
Wed 08
May
01:00

WNW
WNW

3 / 6 mph 70 / 70°F 94% 1009 mb
Low level cloud: 14%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
07:00

NW
NW

2 / 3 mph 79 / 85°F 88% 1011 mb
Low level cloud: 52%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
13:00

WNW
WNW

7 / 9 mph 106 / 114°F 28% 1006 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
0.0 In
19:00

W
W

3 / 6 mph 77 / 81°F 72% 1006 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Thu 09
May
01:00

WNW
WNW

2 / 4 mph 70 / 70°F 99% 1009 mb
Low level cloud: 47%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

2 / 3 mph 75 / 79°F 94% 1009 mb
Low level cloud: 37%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.1 In
13:00

WNW
WNW

6 / 8 mph 107 / 115°F 28% 1006 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

WNW
WNW

2 / 4 mph 77 / 81°F 85% 1005 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.1 In
Fri 10
May
01:00

WNW
WNW

2 / 5 mph 70 / 70°F 96% 1010 mb
Low level cloud: 15%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
07:00

NW
NW

2 / 4 mph 77 / 82°F 95% 1009 mb
Low level cloud: 49%
Mid level cloud: 32%
High level cloud: 21%
Most Significant Cloud Type: low
62%
0.1 In
13:00

WNW
WNW

5 / 7 mph 107 / 116°F 29% 1007 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 6%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

NNW
NNW

2 / 3 mph 75 / 79°F 82% 1006 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: medium
45%
0.2 In
Sat 11
May
01:00

W
W

2 / 5 mph 70 / 70°F 99% 1010 mb
Low level cloud: 30%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
32%
0.1 In
07:00

NW
NW

2 / 4 mph 76 / 81°F 93% 1009 mb
Low level cloud: 33%
Mid level cloud: 25%
High level cloud: 21%
Most Significant Cloud Type: low
44%
0.2 In
13:00

W
W

8 / 13 mph 105 / 115°F 32% 1007 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

WSW
WSW

1 / 2 mph 80 / 83°F 70% 1006 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: medium
25%
0.0 In
Sun 12
May
01:00

WNW
WNW

2 / 5 mph 69 / 69°F 97% 1009 mb
Low level cloud: 22%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: low
27%
0.0 In
07:00

NNW
NNW

2 / 4 mph 75 / 80°F 97% 1010 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
58%
0.6 In
13:00

WNW
WNW

6 / 10 mph 106 / 115°F 30% 1005 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: medium
43%
0.0 In
19:00

W
W

1 / 2 mph 81 / 85°F 69% 1008 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Mon 13
May
01:00

NW
NW

2 / 5 mph 69 / 69°F 97% 1009 mb
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NW
NW

2 / 4 mph 78 / 85°F 93% 1011 mb
Low level cloud: 40%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.1 In
13:00

NW
NW

4 / 7 mph 107 / 114°F 27% 1006 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 1%
Most Significant Cloud Type: medium
31%
0.0 In
19:00

W
W

3 / 5 mph 80 / 83°F 68% 1008 mb
Low level cloud: 0%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
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