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Mcallen 14 Day Long Range Forecast

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

Texas, United States Of America

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

Reviewing the forecast for Mcallen Over the next 14 days and the average daytime maximum temperature will be around 38°C, with a high for the two weeks of 42°C expected on the afternoon of Sunday 26th. The mean minimum temperature will be 26°C, dipping to its lowest on the morning of Saturday 18th at 24°C. The next 14 days will remain predominantly dry. On the whole winds are likely to be fresh.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 18
May		15:00

NE
NE

 8 / 9 mph 101 / 105°F 31% 1007 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
18:00

E
E

 18 / 21 mph 91 / 99°F 58% 1008 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
21:00

E
E

 11 / 16 mph 81 / 88°F 87% 1010 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

E
E

 6 / 10 mph 78 / 85°F 93% 1011 mb
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 4 / 7 mph 77 / 83°F 94% 1010 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 3 / 4 mph 76 / 81°F 96% 1011 mb
Low level cloud: 63%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 6 / 6 mph 89 / 95°F 69% 1012 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 7 / 8 mph 99 / 101°F 32% 1011 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
15:00

E
E

 9 / 11 mph 103 / 103°F 24% 1008 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
18:00

E
E

 18 / 21 mph 93 / 99°F 50% 1008 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
21:00

E
E

 13 / 16 mph 82 / 89°F 82% 1010 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

ESE
ESE

 7 / 11 mph 78 / 85°F 94% 1010 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 7 / 11 mph 77 / 83°F 96% 1009 mb
Low level cloud: 79%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 8 / 12 mph 76 / 82°F 97% 1009 mb
Low level cloud: 70%
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
09:00

SE
SE

 12 / 14 mph 89 / 97°F 64% 1010 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 10 / 12 mph 100 / 107°F 38% 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
15:00

ESE
ESE

 13 / 15 mph 104 / 110°F 31% 1005 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 18 / 22 mph 96 / 104°F 46% 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
21:00

SE
SE

 15 / 22 mph 82 / 89°F 81% 1008 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

SE
SE

 13 / 19 mph 80 / 88°F 91% 1008 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 15 / 22 mph 79 / 85°F 93% 1006 mb
Low level cloud: 56%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 15 / 22 mph 79 / 86°F 90% 1007 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 20 / 23 mph 91 / 99°F 58% 1007 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 21 / 24 mph 99 / 107°F 38% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 20 / 23 mph 100 / 108°F 37% 1004 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
18:00

SE
SE

 20 / 24 mph 91 / 98°F 53% 1004 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
21:00

SE
SE

 17 / 23 mph 82 / 89°F 78% 1006 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

SE
SE

 15 / 21 mph 80 / 87°F 82% 1008 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 93%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 11 / 16 mph 79 / 85°F 87% 1007 mb
Low level cloud: 22%
Mid level cloud: 3%
High level cloud: 19%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 15 / 22 mph 79 / 84°F 87% 1007 mb
Low level cloud: 23%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 20 / 23 mph 91 / 96°F 52% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 21 / 23 mph 101 / 105°F 32% 1006 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
15:00

SE
SE

 22 / 25 mph 101 / 106°F 33% 1005 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
18:00

SE
SE

 22 / 25 mph 91 / 97°F 52% 1005 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
21:00

SE
SE

 16 / 23 mph 82 / 87°F 74% 1007 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

SE
SE

 15 / 22 mph 79 / 86°F 91% 1008 mb
Low level cloud: 48%
Mid level cloud: 2%
High level cloud: 98%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 16 / 23 mph 79 / 86°F 92% 1005 mb
Low level cloud: 48%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 13 / 19 mph 79 / 86°F 93% 1007 mb
Low level cloud: 87%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 20 / 23 mph 90 / 97°F 62% 1009 mb
Low level cloud: 47%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 21 / 25 mph 98 / 106°F 42% 1008 mb
Low level cloud: 13%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 21 / 24 mph 100 / 108°F 38% 1005 mb
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
18:00

SE
SE

 19 / 23 mph 92 / 97°F 50% 1005 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
21:00

SE
SE

 16 / 22 mph 82 / 89°F 81% 1007 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

SE
SE

 15 / 21 mph 80 / 88°F 91% 1007 mb
Low level cloud: 69%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 14 / 20 mph 81 / 89°F 87% 1006 mb
Low level cloud: 90%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 16 / 22 mph 80 / 87°F 87% 1006 mb
Low level cloud: 88%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 19 / 22 mph 90 / 98°F 59% 1007 mb
Low level cloud: 14%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 19 / 22 mph 100 / 108°F 39% 1006 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 20 / 23 mph 102 / 111°F 36% 1004 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 21 / 24 mph 94 / 101°F 50% 1004 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
21:00

SE
SE

 16 / 23 mph 82 / 89°F 77% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May		00:00

SE
SE

 16 / 23 mph 80 / 88°F 91% 1007 mb
Low level cloud: 54%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
06:00

SE
SE

 15 / 26 mph 80 / 86°F 87% 1007 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
12:00

SE
SE

 19 / 29 mph 95 / 103°F 45% 1009 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
18:00

SE
SE

 19 / 35 mph 96 / 109°F 51% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 26
May		00:00

SE
SE

 14 / 21 mph 78 / 84°F 89% 1010 mb
Low level cloud: 37%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
06:00

SSE
SSE

 16 / 23 mph 79 / 86°F 93% 1007 mb
Low level cloud: 55%
Mid level cloud: 4%
High level cloud: 34%
Most Significant Cloud Type: low
60%
0.0 In
12:00

SSE
SSE

 19 / 22 mph 104 / 113°F 33% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

SE
SE

 20 / 23 mph 94 / 103°F 50% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 27
May		00:00

SSE
SSE

 18 / 26 mph 81 / 89°F 87% 1006 mb
Low level cloud: 23%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
06:00

SE
SE

 13 / 19 mph 80 / 87°F 93% 1008 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
59%
0.0 In
12:00

SSE
SSE

 18 / 21 mph 105 / 111°F 27% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
18:00

SE
SE

 20 / 24 mph 94 / 98°F 41% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Tue 28
May		00:00

ESE
ESE

 9 / 13 mph 81 / 89°F 84% 1009 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: low
9%
0.0 In
06:00

SE
SE

 14 / 21 mph 79 / 86°F 92% 1007 mb
Low level cloud: 40%
Mid level cloud: 3%
High level cloud: 38%
Most Significant Cloud Type: low
46%
0.0 In
12:00

E
E

 14 / 20 mph 95 / 99°F 38% 1016 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 17%
Most Significant Cloud Type: medium
29%
0.1 In
18:00

SE
SE

 20 / 24 mph 93 / 98°F 42% 1007 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
Wed 29
May		00:00

ENE
ENE

 7 / 10 mph 78 / 83°F 85% 1018 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: medium
35%
0.0 In
06:00

E
E

 10 / 15 mph 81 / 89°F 84% 1012 mb
Low level cloud: 23%
Mid level cloud: 2%
High level cloud: 52%
Most Significant Cloud Type: low
29%
0.0 In
12:00

E
E

 13 / 19 mph 87 / 89°F 43% 1019 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 13%
Most Significant Cloud Type: medium
14%
0.0 In
18:00

SE
SE

 20 / 24 mph 93 / 96°F 37% 1008 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Thu 30
May		00:00

ESE
ESE

 8 / 11 mph 75 / 78°F 78% 1017 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: low
23%
0.0 In
06:00

ESE
ESE

 10 / 15 mph 79 / 86°F 97% 1013 mb
Low level cloud: 84%
Mid level cloud: 9%
High level cloud: 41%
Most Significant Cloud Type: low
92%
0.0 In
12:00

E
E

 16 / 23 mph 87 / 91°F 53% 1017 mb
Low level cloud: 37%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
18:00

SE
SE

 19 / 23 mph 93 / 98°F 43% 1009 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
Fri 31
May		00:00

E
E

 12 / 17 mph 77 / 80°F 71% 1019 mb
Low level cloud: 36%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
06:00

SE
SE

 14 / 21 mph 78 / 84°F 92% 1013 mb
Low level cloud: 45%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
46%
0.0 In
12:00

E
E

 15 / 22 mph 87 / 91°F 56% 1019 mb
Low level cloud: 83%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
18:00

SE
SE

 20 / 24 mph 94 / 99°F 40% 1010 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: medium
8%
0.0 In
Sat 01
Jun		00:00

ESE
ESE

 11 / 19 mph 78 / 81°F 75% 1018 mb
Low level cloud: 48%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.1 In
06:00

SE
SE

 10 / 15 mph 79 / 85°F 90% 1012 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
33%
0.0 In
12:00

ESE
ESE

 15 / 27 mph 86 / 92°F 60% 1017 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 21 / 25 mph 93 / 100°F 47% 1009 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 02
Jun		00:00

ESE
ESE

 14 / 27 mph 78 / 81°F 75% 1016 mb
Low level cloud: 85%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 13 / 19 mph 79 / 85°F 85% 1011 mb
Low level cloud: 61%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
12:00

SE
SE

 18 / 35 mph 89 / 94°F 54% 1015 mb
Low level cloud: 81%
Mid level cloud: 23%
High level cloud: 12%
Most Significant Cloud Type: low
90%
0.0 In
18:00

SE
SE

 20 / 25 mph 93 / 100°F 50% 1009 mb
Low level cloud: 47%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
48%
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