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Alachua 14 Day Long Range Forecast

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

Florida, United States Of America

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

Taking a look at Alachua over the coming two weeks and the average daytime maximum temperature will be around 34°C, with a high for the two weeks of 38°C expected on the afternoon of Tuesday 28th. The mean minimum temperature will be 21°C, dipping to its lowest on the morning of Saturday 1st at 18°C. The fortnight ahead will have most days seeing a little rain. It looks like Tuesday 28th will have the most precipitation with an accumulation of around 20.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
16:00

W
W

7 / 8 mph 98 / 98°F 32% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

10 / 15 mph 86 / 86°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 6%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

2 / 2 mph 79 / 82°F 66% 1013 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
01:00

WSW
WSW

4 / 6 mph 77 / 80°F 73% 1012 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

4 / 7 mph 74 / 78°F 82% 1012 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
07:00

W
W

5 / 7 mph 78 / 78°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

5 / 5 mph 90 / 90°F 45% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 20%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

6 / 7 mph 97 / 95°F 28% 1012 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

7 / 8 mph 97 / 96°F 28% 1010 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 11%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

6 / 11 mph 87 / 87°F 57% 1011 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 16%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

4 / 7 mph 77 / 81°F 82% 1013 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
Sun 26
May
01:00

NW
NW

2 / 4 mph 76 / 80°F 89% 1012 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
04:00

W
W

4 / 8 mph 73 / 77°F 91% 1012 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

3 / 5 mph 80 / 81°F 81% 1014 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

3 / 4 mph 92 / 96°F 49% 1014 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

4 / 4 mph 99 / 101°F 33% 1012 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

4 / 4 mph 101 / 101°F 28% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

9 / 14 mph 87 / 89°F 56% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

5 / 8 mph 78 / 82°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
01:00

WSW
WSW

4 / 7 mph 75 / 79°F 87% 1014 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

4 / 6 mph 73 / 78°F 91% 1013 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

4 / 6 mph 79 / 80°F 79% 1015 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

7 / 8 mph 91 / 91°F 44% 1015 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
13:00

WSW
WSW

9 / 10 mph 98 / 97°F 27% 1014 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
16:00

WSW
WSW

11 / 13 mph 97 / 96°F 25% 1012 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
19:00

WSW
WSW

10 / 16 mph 87 / 86°F 47% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

6 / 11 mph 76 / 80°F 79% 1015 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
Tue 28
May
01:00

W
W

5 / 8 mph 75 / 79°F 90% 1014 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

4 / 7 mph 73 / 78°F 95% 1015 mb
Low level cloud: 24%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

5 / 7 mph 79 / 80°F 89% 1017 mb
Low level cloud: 21%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

NW
NW

5 / 7 mph 90 / 94°F 57% 1017 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

5 / 6 mph 99 / 99°F 28% 1015 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

W
W

5 / 6 mph 101 / 99°F 24% 1013 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
19:00

WNW
WNW

4 / 9 mph 92 / 91°F 41% 1013 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 13%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

10 / 20 mph 71 / 71°F 94% 1019 mb
Low level cloud: 22%
Mid level cloud: 47%
High level cloud: 97%
Most Significant Cloud Type: low
49%
Expect 0.7 In of precipitation over the past 3 hours.
0.7 In
Wed 29
May
01:00

NNE
NNE

6 / 12 mph 73 / 77°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
45%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
04:00

ESE
ESE

2 / 4 mph 72 / 76°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

2 / 3 mph 77 / 77°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

3 / 4 mph 89 / 89°F 45% 1017 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
13:00

SSE
SSE

2 / 2 mph 98 / 100°F 33% 1015 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

NW
NW

2 / 2 mph 98 / 97°F 29% 1013 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
19:00

ENE
ENE

0 / 1 mph 89 / 87°F 51% 1014 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
22:00

SE
SE

7 / 11 mph 78 / 81°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
May
01:00

SSW
SSW

5 / 9 mph 74 / 78°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 22%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

4 / 8 mph 73 / 77°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

4 / 5 mph 77 / 77°F 84% 1014 mb
Low level cloud: 10%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

5 / 6 mph 88 / 88°F 51% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
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

W
W

9 / 10 mph 95 / 94°F 34% 1012 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

11 / 13 mph 89 / 90°F 47% 1011 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

5 / 8 mph 79 / 80°F 83% 1013 mb
Low level cloud: 15%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NNE
NNE

4 / 8 mph 73 / 77°F 90% 1014 mb
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 31
May
01:00

ESE
ESE

3 / 6 mph 75 / 78°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

3 / 4 mph 77 / 78°F 51% 1019 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

E
E

8 / 11 mph 90 / 89°F 31% 1019 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

W
W

9 / 14 mph 85 / 87°F 51% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 01
Jun
01:00

ESE
ESE

6 / 11 mph 74 / 77°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
07:00

ENE
ENE

6 / 8 mph 72 / 76°F 66% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NE
NE

5 / 7 mph 94 / 92°F 24% 1015 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

E
E

11 / 17 mph 79 / 80°F 46% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 02
Jun
01:00

SE
SE

4 / 9 mph 70 / 70°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

E
E

3 / 4 mph 73 / 77°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

N
N

4 / 6 mph 97 / 96°F 25% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

E
E

11 / 17 mph 83 / 83°F 42% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 03
Jun
01:00

SE
SE

4 / 7 mph 74 / 77°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

S
S

4 / 6 mph 72 / 76°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

WNW
WNW

7 / 10 mph 97 / 98°F 28% 1012 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 43%
Most Significant Cloud Type: medium
61%
0.0 In
19:00

ESE
ESE

1 / 2 mph 91 / 92°F 36% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 04
Jun
01:00

S
S

5 / 9 mph 71 / 71°F 91% 1012 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.1 In
07:00

S
S

6 / 8 mph 74 / 77°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

WNW
WNW

9 / 14 mph 97 / 97°F 27% 1010 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

W
W

9 / 15 mph 88 / 86°F 29% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Wed 05
Jun
01:00

E
E

2 / 4 mph 77 / 80°F 62% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

WSW
WSW

3 / 4 mph 78 / 82°F 72% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

NNW
NNW

4 / 7 mph 102 / 101°F 21% 1009 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

ENE
ENE

11 / 18 mph 75 / 79°F 85% 1015 mb
Low level cloud: 36%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
51%
0.1 In
Thu 06
Jun
01:00

ESE
ESE

6 / 11 mph 77 / 80°F 70% 1010 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

SE
SE

2 / 4 mph 76 / 80°F 83% 1014 mb
Low level cloud: 2%
Mid level cloud: 25%
High level cloud: 33%
Most Significant Cloud Type: medium
31%
0.1 In
13:00

SW
SW

7 / 12 mph 97 / 100°F 34% 1008 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: medium
91%
0.0 In
19:00

E
E

9 / 16 mph 74 / 78°F 89% 1013 mb
Low level cloud: 59%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
75%
0.1 In
Fri 07
Jun
01:00

SSW
SSW

5 / 9 mph 72 / 76°F 85% 1010 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NW
NW

5 / 11 mph 72 / 77°F 94% 1012 mb
Low level cloud: 78%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.4 In
13:00

SW
SW

13 / 23 mph 90 / 94°F 44% 1008 mb
Low level cloud: 5%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: medium
79%
0.0 In
19:00

NNW
NNW

5 / 11 mph 81 / 84°F 62% 1010 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
Sat 08
Jun
01:00

WNW
WNW

3 / 6 mph 71 / 71°F 77% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

WNW
WNW

4 / 8 mph 76 / 79°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

W
W

7 / 12 mph 95 / 94°F 25% 1010 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

NW
NW

5 / 11 mph 84 / 84°F 41% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
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