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Alexandria 14 Day Long Range Forecast

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

Virginia, United States Of America

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

Reviewing the forecast for Alexandria Over the next 14 days and the average daytime maximum temperature will be around 31°C, with a high for the two weeks of 38°C expected on the afternoon of Sunday 10th. The average minimum temperature will be 20°C, dipping to its lowest on the morning of Sunday 3rd at 17°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Current predictions suggest Friday 8th will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 01
Aug		01:00

NNE
NNE

 8 / 12 mph 70 / 70°F 96% 1016 mb
Low level cloud: 97%
Mid level cloud: 29%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 7 / 11 mph 67 / 67°F 90% 1018 mb
Low level cloud: 33%
Mid level cloud: 25%
High level cloud: 97%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 8 / 10 mph 69 / 69°F 85% 1020 mb
Low level cloud: 90%
Mid level cloud: 18%
High level cloud: 61%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 7 / 9 mph 72 / 76°F 80% 1021 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 7 / 9 mph 75 / 78°F 72% 1021 mb
Low level cloud: 98%
Mid level cloud: 55%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 4 / 5 mph 75 / 78°F 69% 1021 mb
Low level cloud: 86%
Mid level cloud: 72%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 3 / 4 mph 75 / 78°F 77% 1022 mb
Low level cloud: 90%
Mid level cloud: 43%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 2 / 3 mph 73 / 77°F 78% 1023 mb
Low level cloud: 12%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 02
Aug		16:00

E
E

 5 / 6 mph 85 / 82°F 48% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 3 / 5 mph 77 / 77°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 4%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 4 mph 72 / 76°F 75% 1022 mb
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
Sun 03
Aug		01:00

E
E

 2 / 5 mph 66 / 66°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 17%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 3 / 6 mph 64 / 64°F 83% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 16%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 4 / 5 mph 72 / 69°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 6 / 7 mph 81 / 79°F 48% 1022 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 10 mph 85 / 82°F 40% 1021 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 8 / 9 mph 85 / 82°F 41% 1020 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 4 / 6 mph 78 / 78°F 60% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 99%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 4 / 6 mph 72 / 72°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 04
Aug		01:00

E
E

 2 / 4 mph 66 / 66°F 76% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 3 / 6 mph 64 / 64°F 80% 1021 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
07:00

NNE
NNE

 4 / 6 mph 72 / 69°F 72% 1022 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
10:00

NE
NE

 5 / 6 mph 82 / 80°F 48% 1022 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

E
E

 7 / 8 mph 87 / 84°F 35% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 9 / 10 mph 87 / 85°F 39% 1020 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
19:00

SE
SE

 3 / 4 mph 86 / 87°F 62% 1022 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

SSE
SSE

 3 / 5 mph 72 / 76°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 05
Aug		01:00

W
W

 2 / 3 mph 67 / 67°F 70% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 2 / 5 mph 65 / 65°F 72% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 98%
Most Significant Cloud Type: high
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 3 / 4 mph 71 / 71°F 67% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 5 / 6 mph 85 / 83°F 51% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 30%
Most Significant Cloud Type: high
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 11 mph 87 / 85°F 36% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: high
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 8 / 9 mph 87 / 85°F 40% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 87%
Most Significant Cloud Type: high
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 4 / 7 mph 81 / 81°F 60% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 15%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 5 / 8 mph 73 / 77°F 65% 1027 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 34%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 06
Aug		01:00

ENE
ENE

 3 / 5 mph 67 / 67°F 79% 1028 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 3 / 7 mph 64 / 64°F 89% 1028 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 14%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 5 / 7 mph 74 / 76°F 82% 1029 mb
Low level cloud: 7%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 7 / 8 mph 83 / 82°F 53% 1029 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 33%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 10 mph 88 / 86°F 44% 1028 mb
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 6%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 10 / 11 mph 88 / 86°F 42% 1027 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 6 / 9 mph 81 / 82°F 67% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 16%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 5 / 8 mph 72 / 76°F 83% 1028 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 7%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 07
Aug		01:00

ENE
ENE

 3 / 6 mph 69 / 69°F 91% 1028 mb
Low level cloud: 21%
Mid level cloud: 24%
High level cloud: 15%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 4 / 7 mph 67 / 67°F 95% 1027 mb
Low level cloud: 33%
Mid level cloud: 30%
High level cloud: 10%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 6 / 8 mph 76 / 76°F 86% 1027 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 8 / 9 mph 84 / 84°F 59% 1027 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 11 mph 84 / 86°F 51% 1024 mb
Low level cloud: 76%
Mid level cloud: 43%
High level cloud: 30%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 7 / 8 mph 88 / 86°F 47% 1022 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 6 / 11 mph 80 / 79°F 74% 1022 mb
Low level cloud: 25%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 4 / 7 mph 72 / 76°F 86% 1023 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 08
Aug		01:00

S
S

 3 / 7 mph 76 / 81°F 94% 1018 mb
Low level cloud: 9%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: medium
51%
0.0 In
07:00

SW
SW

 4 / 9 mph 74 / 78°F 96% 1016 mb
Low level cloud: 81%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
13:00

SW
SW

 4 / 9 mph 99 / 109°F 40% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

E
E

 6 / 12 mph 90 / 112°F 83% 1018 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Sat 09
Aug		01:00

SSW
SSW

 2 / 3 mph 78 / 84°F 94% 1019 mb
Low level cloud: 1%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
0.0 In
07:00

NNE
NNE

 1 / 1 mph 80 / 84°F 77% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
13:00

ESE
ESE

 3 / 3 mph 100 / 112°F 41% 1017 mb
Low level cloud: 12%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
19:00

SE
SE

 5 / 8 mph 89 / 100°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Sun 10
Aug		01:00

S
S

 3 / 4 mph 83 / 93°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 20%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

SSW
SSW

 2 / 4 mph 86 / 95°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
13:00

WSW
WSW

 4 / 4 mph 100 / 110°F 39% 1016 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 6%
Most Significant Cloud Type: medium
34%
0.0 In
19:00

S
S

 7 / 11 mph 90 / 99°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 29%
Most Significant Cloud Type: medium
27%
0.0 In
Mon 11
Aug		01:00

NW
NW

 6 / 10 mph 82 / 91°F 88% 1016 mb
Low level cloud: 13%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
22%
0.1 In
07:00

SW
SW

 5 / 7 mph 83 / 92°F 78% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 13%
Most Significant Cloud Type: medium
18%
0.0 In
13:00

SW
SW

 5 / 8 mph 100 / 113°F 43% 1015 mb
Low level cloud: 9%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: low
15%
0.0 In
19:00

NW
NW

 10 / 15 mph 84 / 91°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: medium
12%
0.0 In
Tue 12
Aug		01:00

SSW
SSW

 4 / 9 mph 76 / 80°F 93% 1013 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
54%
0.2 In
07:00

SSE
SSE

 1 / 2 mph 84 / 95°F 85% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
0.1 In
13:00

NW
NW

 11 / 22 mph 84 / 88°F 60% 1014 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
19:00

NW
NW

 4 / 9 mph 79 / 87°F 94% 1013 mb
Low level cloud: 24%
Mid level cloud: 43%
High level cloud: 17%
Most Significant Cloud Type: low
40%
1.1 In
Wed 13
Aug		01:00

NNW
NNW

 6 / 13 mph 76 / 78°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

NW
NW

 5 / 10 mph 78 / 82°F 85% 1015 mb
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

NW
NW

 5 / 10 mph 90 / 90°F 31% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
19:00

ESE
ESE

 4 / 7 mph 87 / 99°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
Thu 14
Aug		01:00

SSW
SSW

 3 / 6 mph 76 / 78°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

E
E

 1 / 2 mph 79 / 85°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
13:00

SSW
SSW

 6 / 12 mph 94 / 97°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
19:00

SSW
SSW

 2 / 5 mph 82 / 87°F 74% 1018 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.1 In
Fri 15
Aug		01:00

S
S

 4 / 8 mph 80 / 87°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

WSW
WSW

 1 / 3 mph 83 / 90°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

S
S

 8 / 16 mph 97 / 103°F 38% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

ESE
ESE

 5 / 10 mph 87 / 97°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Sat 16
Aug		01:00

S
S

 3 / 7 mph 77 / 83°F 98% 1013 mb
Low level cloud: 26%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: low
36%
0.2 In
07:00

SSW
SSW

 3 / 7 mph 81 / 89°F 85% 1020 mb
Low level cloud: 9%
Mid level cloud: 19%
High level cloud: 40%
Most Significant Cloud Type: low
20%
0.0 In
13:00

W
W

 4 / 8 mph 98 / 109°F 43% 1013 mb
Low level cloud: 14%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
25%
0.0 In
19:00

WSW
WSW

 8 / 16 mph 75 / 79°F 90% 1018 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: medium
33%
0.2 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