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Aberdeen 14 Day Long Range Forecast

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

Maryland, United States Of America

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

For Aberdeen in the coming two weeks the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 29°C expected on the afternoon of Wednesday 5th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Friday 31st at 11°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Predictions are Thursday 6th will have the most precipitation with an accumulation of around 31.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 28
May
16:00

W
W

11 / 15 mph 80 / 79°F 51% 1009 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

7 / 14 mph 71 / 69°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

8 / 16 mph 63 / 63°F 79% 1012 mb
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
Wed 29
May
01:00

NW
NW

7 / 13 mph 59 / 58°F 89% 1012 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

6 / 12 mph 57 / 56°F 89% 1012 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
07:00

NW
NW

7 / 9 mph 65 / 63°F 74% 1014 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
10:00

NW
NW

7 / 8 mph 73 / 76°F 58% 1014 mb
Low level cloud: 16%
Mid level cloud: 12%
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

NW
NW

8 / 10 mph 76 / 77°F 55% 1013 mb
Low level cloud: 16%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

8 / 9 mph 76 / 77°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 59%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

10 / 18 mph 62 / 61°F 90% 1014 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 32%
Most Significant Cloud Type: medium
87%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NW
NW

5 / 9 mph 60 / 60°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 10%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
01:00

N
N

6 / 12 mph 58 / 57°F 93% 1014 mb
Low level cloud: 6%
Mid level cloud: 32%
High level cloud: 52%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

9 / 14 mph 58 / 56°F 93% 1014 mb
Low level cloud: 27%
Mid level cloud: 52%
High level cloud: 6%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

9 / 13 mph 60 / 57°F 87% 1017 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

11 / 13 mph 68 / 67°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

11 / 13 mph 72 / 76°F 45% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

11 / 13 mph 73 / 75°F 45% 1016 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

5 / 11 mph 66 / 64°F 65% 1016 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

NW
NW

9 / 19 mph 57 / 54°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
01:00

N
N

11 / 21 mph 54 / 51°F 67% 1018 mb
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
04:00

NNW
NNW

11 / 22 mph 51 / 47°F 67% 1019 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
07:00

N
N

13 / 16 mph 57 / 53°F 65% 1021 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

11 / 13 mph 68 / 67°F 51% 1021 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

11 / 12 mph 73 / 75°F 43% 1020 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

11 / 13 mph 73 / 75°F 44% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

5 / 10 mph 67 / 64°F 63% 1020 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
22:00

NNW
NNW

7 / 15 mph 59 / 58°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun
01:00

NNW
NNW

7 / 15 mph 56 / 54°F 70% 1022 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
04:00

NNW
NNW

8 / 16 mph 53 / 51°F 74% 1021 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
07:00

NNW
NNW

10 / 14 mph 60 / 57°F 63% 1023 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
10:00

N
N

8 / 9 mph 72 / 69°F 46% 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

N
N

6 / 7 mph 77 / 76°F 39% 1021 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

N
N

4 / 5 mph 77 / 76°F 43% 1019 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

NW
NW

3 / 6 mph 69 / 66°F 62% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 66%
Most Significant Cloud Type: high
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

2 / 4 mph 63 / 63°F 62% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Jun
01:00

S
S

4 / 9 mph 61 / 61°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

2 / 5 mph 57 / 59°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 76%
Most Significant Cloud Type: high
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

3 / 5 mph 67 / 65°F 63% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 85%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

7 / 8 mph 76 / 76°F 56% 1018 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 37%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

8 / 9 mph 79 / 78°F 51% 1017 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

8 / 11 mph 69 / 66°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

6 / 9 mph 66 / 65°F 90% 1016 mb
Low level cloud: 53%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

5 / 10 mph 65 / 65°F 90% 1016 mb
Low level cloud: 84%
Mid level cloud: 79%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun
01:00

SE
SE

5 / 9 mph 64 / 64°F 92% 1015 mb
Low level cloud: 90%
Mid level cloud: 58%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

5 / 9 mph 63 / 63°F 94% 1015 mb
Low level cloud: 82%
Mid level cloud: 74%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

6 / 8 mph 65 / 65°F 94% 1015 mb
Low level cloud: 81%
Mid level cloud: 58%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

7 / 9 mph 69 / 69°F 91% 1015 mb
Low level cloud: 98%
Mid level cloud: 49%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

5 / 7 mph 70 / 70°F 89% 1014 mb
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
99%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SE
SE

6 / 9 mph 72 / 76°F 85% 1013 mb
Low level cloud: 87%
Mid level cloud: 32%
High level cloud: 3%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

ESE
ESE

6 / 9 mph 69 / 68°F 95% 1013 mb
Low level cloud: 83%
Mid level cloud: 32%
High level cloud: 22%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

E
E

6 / 8 mph 66 / 66°F 98% 1014 mb
Low level cloud: 92%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Tue 04
Jun
01:00

SSW
SSW

5 / 11 mph 64 / 64°F 93% 1014 mb
Low level cloud: 35%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
07:00

SW
SW

9 / 20 mph 67 / 67°F 70% 1023 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

SSW
SSW

9 / 19 mph 82 / 85°F 60% 1011 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 66%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

S
S

6 / 14 mph 80 / 83°F 68% 1010 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
Wed 05
Jun
01:00

SSW
SSW

8 / 16 mph 72 / 76°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 5%
Most Significant Cloud Type: medium
24%
0.0 In
07:00

ESE
ESE

5 / 11 mph 73 / 78°F 92% 1008 mb
Low level cloud: 59%
Mid level cloud: 18%
High level cloud: 35%
Most Significant Cloud Type: low
69%
0.0 In
13:00

W
W

4 / 8 mph 81 / 85°F 75% 1008 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SE
SE

7 / 15 mph 70 / 70°F 77% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
Thu 06
Jun
01:00

WNW
WNW

8 / 16 mph 71 / 71°F 93% 1007 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
0.1 In
07:00

SSE
SSE

3 / 6 mph 68 / 68°F 93% 1012 mb
Low level cloud: 70%
Mid level cloud: 89%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WNW
WNW

13 / 26 mph 87 / 90°F 51% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

WNW
WNW

5 / 11 mph 72 / 77°F 96% 1004 mb
Low level cloud: 28%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
54%
0.5 In
Fri 07
Jun
01:00

NW
NW

13 / 25 mph 72 / 76°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

WNW
WNW

5 / 11 mph 72 / 76°F 83% 1002 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
0.7 In
13:00

WNW
WNW

9 / 17 mph 83 / 84°F 45% 1009 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

W
W

5 / 11 mph 68 / 68°F 81% 999 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.1 In
Sat 08
Jun
01:00

W
W

6 / 12 mph 73 / 77°F 86% 1004 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WNW
WNW

12 / 24 mph 61 / 61°F 77% 1001 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
13:00

NW
NW

6 / 13 mph 83 / 87°F 63% 1001 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: low
54%
0.0 In
19:00

W
W

8 / 17 mph 63 / 63°F 72% 1005 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
Sun 09
Jun
01:00

NNW
NNW

11 / 23 mph 58 / 55°F 85% 1004 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
17%
1.4 In
07:00

W
W

9 / 20 mph 61 / 61°F 74% 1009 mb
Low level cloud: 82%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

12 / 25 mph 75 / 76°F 39% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

W
W

6 / 13 mph 70 / 70°F 77% 1009 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: medium
22%
0.0 In
Mon 10
Jun
01:00

NNW
NNW

6 / 12 mph 61 / 60°F 73% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
0.0 In
07:00

W
W

6 / 13 mph 69 / 69°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: medium
16%
0.0 In
13:00

NNW
NNW

6 / 14 mph 78 / 78°F 38% 1010 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 12%
Most Significant Cloud Type: medium
38%
0.0 In
19:00

SSE
SSE

6 / 12 mph 74 / 77°F 67% 1010 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
Tue 11
Jun
01:00

E
E

4 / 9 mph 65 / 65°F 70% 1010 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 41%
Most Significant Cloud Type: medium
45%
0.0 In
07:00

WSW
WSW

6 / 14 mph 67 / 67°F 97% 1011 mb
Low level cloud: 67%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SSE
SSE

9 / 18 mph 86 / 90°F 56% 1008 mb
Low level cloud: 28%
Mid level cloud: 19%
High level cloud: 14%
Most Significant Cloud Type: low
36%
0.0 In
19:00

SSW
SSW

11 / 22 mph 70 / 70°F 92% 1007 mb
Low level cloud: 23%
Mid level cloud: 44%
High level cloud: 60%
Most Significant Cloud Type: low
46%
0.9 In
Wed 12
Jun
01:00

SE
SE

5 / 10 mph 72 / 77°F 98% 1008 mb
Low level cloud: 82%
Mid level cloud: 28%
High level cloud: 15%
Most Significant Cloud Type: low
93%
1.7 In
07:00

W
W

6 / 13 mph 70 / 70°F 86% 1009 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
54%
0.3 In
13:00

S
S

15 / 32 mph 84 / 89°F 67% 1007 mb
Low level cloud: 29%
Mid level cloud: 30%
High level cloud: 20%
Most Significant Cloud Type: low
41%
0.0 In
19:00

WNW
WNW

6 / 12 mph 70 / 70°F 73% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
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