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Portage 14 Day Long Range Forecast

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

Alaska, United States Of America

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

The next 14 day outlook for Portage shows the average daytime maximum temperature will be around 7°C, with a high for the two weeks of 10°C expected on the afternoon of Thursday 23rd. The mean minimum temperature will be 2°C, dipping to its lowest on the morning of Monday 20th at -1°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Predictions are Sunday 19th will have the most precipitation with an accumulation of around 26.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
00:00

E
E

3 / 3 mph 39 / 37°F 98% 1017 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

2 / 2 mph 38 / 38°F 99% 1017 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

2 / 2 mph 39 / 39°F 98% 1017 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

1 / 1 mph 41 / 41°F 87% 1018 mb
Low level cloud: 59%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

2 / 2 mph 45 / 46°F 68% 1018 mb
Low level cloud: 72%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

3 / 4 mph 48 / 47°F 61% 1018 mb
Low level cloud: 17%
Mid level cloud: 34%
High level cloud: 1%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

3 / 3 mph 49 / 47°F 60% 1018 mb
Low level cloud: 10%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

3 / 5 mph 39 / 36°F 75% 1019 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
12:00

ESE
ESE

6 / 7 mph 46 / 42°F 72% 1018 mb
Low level cloud: 35%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

7 / 9 mph 45 / 41°F 74% 1017 mb
Low level cloud: 50%
Mid level cloud: 40%
High level cloud: 97%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

8 / 9 mph 43 / 38°F 84% 1016 mb
Low level cloud: 50%
Mid level cloud: 46%
High level cloud: 84%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

9 / 10 mph 40 / 35°F 92% 1015 mb
Low level cloud: 86%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

E
E

9 / 11 mph 38 / 32°F 98% 1014 mb
Low level cloud: 87%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

E
E

8 / 10 mph 37 / 31°F 100% 1013 mb
Low level cloud: 97%
Mid level cloud: 51%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
06:00

ENE
ENE

7 / 9 mph 37 / 31°F 99% 1013 mb
Low level cloud: 94%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
09:00

ENE
ENE

6 / 7 mph 38 / 33°F 99% 1013 mb
Low level cloud: 89%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

NE
NE

3 / 4 mph 39 / 37°F 98% 1013 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

S
S

4 / 5 mph 43 / 39°F 95% 1013 mb
Low level cloud: 32%
Mid level cloud: 26%
High level cloud: 30%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

3 / 3 mph 42 / 40°F 91% 1014 mb
Low level cloud: 22%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

4 / 8 mph 33 / 29°F 95% 1015 mb
Low level cloud: 43%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

SSE
SSE

2 / 4 mph 31 / 29°F 93% 1016 mb
Low level cloud: 31%
Mid level cloud: 67%
High level cloud: 33%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

2 / 4 mph 30 / 29°F 96% 1017 mb
Low level cloud: 53%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

1 / 1 mph 36 / 36°F 94% 1017 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 54%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

1 / 1 mph 42 / 41°F 92% 1018 mb
Low level cloud: 37%
Mid level cloud: 29%
High level cloud: 35%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

4 / 4 mph 45 / 43°F 87% 1018 mb
Low level cloud: 29%
Mid level cloud: 25%
High level cloud: 3%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

4 / 5 mph 47 / 44°F 82% 1018 mb
Low level cloud: 18%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

4 / 5 mph 45 / 42°F 88% 1019 mb
Low level cloud: 46%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 4 mph 43 / 40°F 91% 1020 mb
Low level cloud: 57%
Mid level cloud: 31%
High level cloud: 16%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

SE
SE

4 / 4 mph 40 / 38°F 93% 1021 mb
Low level cloud: 69%
Mid level cloud: 40%
High level cloud: 32%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

3 / 4 mph 38 / 36°F 93% 1022 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

4 / 6 mph 37 / 34°F 93% 1022 mb
Low level cloud: 93%
Mid level cloud: 29%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

5 / 6 mph 40 / 37°F 91% 1022 mb
Low level cloud: 85%
Mid level cloud: 52%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

6 / 6 mph 44 / 40°F 83% 1022 mb
Low level cloud: 76%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

7 / 8 mph 45 / 42°F 87% 1021 mb
Low level cloud: 87%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

7 / 8 mph 44 / 39°F 97% 1021 mb
Low level cloud: 94%
Mid level cloud: 94%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

7 / 9 mph 41 / 36°F 98% 1020 mb
Low level cloud: 95%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May
00:00

ESE
ESE

7 / 9 mph 39 / 33°F 99% 1020 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

ESE
ESE

6 / 8 mph 38 / 33°F 100% 1019 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

ESE
ESE

6 / 7 mph 38 / 33°F 100% 1018 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

ESE
ESE

5 / 6 mph 40 / 36°F 98% 1017 mb
Low level cloud: 89%
Mid level cloud: 51%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

5 / 6 mph 44 / 41°F 86% 1017 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

4 / 5 mph 45 / 43°F 80% 1016 mb
Low level cloud: 85%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

4 / 4 mph 45 / 43°F 81% 1016 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 51%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

2 / 3 mph 43 / 41°F 91% 1017 mb
Low level cloud: 41%
Mid level cloud: 45%
High level cloud: 67%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

3 / 6 mph 34 / 31°F 93% 1017 mb
Low level cloud: 30%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

2 / 2 mph 36 / 36°F 90% 1017 mb
Low level cloud: 19%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

1 / 1 mph 40 / 39°F 88% 1016 mb
Low level cloud: 41%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

2 / 3 mph 46 / 45°F 81% 1016 mb
Low level cloud: 51%
Mid level cloud: 26%
High level cloud: 1%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

4 / 5 mph 48 / 46°F 72% 1015 mb
Low level cloud: 85%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

5 / 6 mph 49 / 47°F 73% 1014 mb
Low level cloud: 66%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

5 / 6 mph 47 / 44°F 79% 1014 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

4 / 4 mph 44 / 42°F 91% 1013 mb
Low level cloud: 91%
Mid level cloud: 48%
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
Fri 24
May
03:00

WNW
WNW

5 / 9 mph 40 / 37°F 96% 1016 mb
Low level cloud: 69%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
89%
0.0 In
09:00

WNW
WNW

2 / 3 mph 65 / 65°F 57% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
4%
0.0 In
15:00

SE
SE

4 / 5 mph 56 / 56°F 62% 1017 mb
Low level cloud: 16%
Mid level cloud: 49%
High level cloud: 46%
Most Significant Cloud Type: medium
94%
0.0 In
21:00

WSW
WSW

2 / 2 mph 42 / 42°F 95% 1017 mb
Low level cloud: 57%
Mid level cloud: 78%
High level cloud: 1%
Most Significant Cloud Type: low
84%
0.0 In
Sat 25
May
03:00

ESE
ESE

5 / 7 mph 43 / 40°F 93% 1018 mb
Low level cloud: 78%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
09:00

E
E

6 / 9 mph 41 / 37°F 97% 1013 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
15:00

E
E

5 / 9 mph 42 / 38°F 98% 1007 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
21:00

ESE
ESE

6 / 9 mph 41 / 38°F 99% 1012 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.3 In
Sun 26
May
03:00

E
E

6 / 10 mph 39 / 35°F 100% 1005 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.6 In
09:00

E
E

5 / 7 mph 39 / 35°F 100% 1009 mb
Low level cloud: 99%
Mid level cloud: 56%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.6 In
15:00

E
E

6 / 10 mph 41 / 38°F 99% 1013 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
21:00

ESE
ESE

1 / 2 mph 39 / 39°F 100% 1010 mb
Low level cloud: 99%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
Mon 27
May
03:00

SE
SE

2 / 4 mph 33 / 33°F 89% 1017 mb
Low level cloud: 23%
Mid level cloud: 17%
High level cloud: 11%
Most Significant Cloud Type: low
30%
0.2 In
09:00

WNW
WNW

2 / 4 mph 41 / 40°F 99% 1011 mb
Low level cloud: 87%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
15:00

SSE
SSE

4 / 6 mph 50 / 49°F 62% 1014 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 2%
Most Significant Cloud Type: low
18%
0.0 In
21:00

NE
NE

1 / 2 mph 41 / 41°F 89% 1016 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
Tue 28
May
03:00

ESE
ESE

3 / 6 mph 43 / 42°F 91% 1014 mb
Low level cloud: 89%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
09:00

SE
SE

3 / 4 mph 45 / 44°F 79% 1021 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
45%
0.0 In
15:00

E
E

4 / 9 mph 46 / 43°F 91% 1017 mb
Low level cloud: 89%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
21:00

ESE
ESE

4 / 6 mph 45 / 43°F 87% 1021 mb
Low level cloud: 83%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Wed 29
May
03:00

E
E

5 / 11 mph 40 / 36°F 98% 1019 mb
Low level cloud: 96%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
09:00

ESE
ESE

4 / 7 mph 45 / 43°F 88% 1022 mb
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
15:00

E
E

4 / 9 mph 41 / 38°F 99% 1020 mb
Low level cloud: 89%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
21:00

E
E

5 / 9 mph 45 / 42°F 95% 1019 mb
Low level cloud: 87%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 30
May
03:00

WNW
WNW

4 / 8 mph 36 / 33°F 90% 1018 mb
Low level cloud: 47%
Mid level cloud: 59%
High level cloud: 98%
Most Significant Cloud Type: low
79%
0.1 In
09:00

E
E

8 / 14 mph 39 / 33°F 99% 1013 mb
Low level cloud: 99%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
15:00

WNW
WNW

2 / 5 mph 53 / 54°F 57% 1013 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
21:00

E
E

6 / 11 mph 39 / 35°F 100% 1012 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.0 In
Fri 31
May
03:00

WNW
WNW

5 / 10 mph 40 / 36°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 68%
Most Significant Cloud Type: high
68%
0.0 In
09:00

E
E

4 / 7 mph 39 / 36°F 100% 1010 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
1.0 In
15:00

ESE
ESE

5 / 10 mph 56 / 55°F 59% 1011 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
55%
0.0 In
21:00

E
E

5 / 9 mph 39 / 35°F 100% 1012 mb
Low level cloud: 97%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Sat 01
Jun
03:00

ESE
ESE

1 / 2 mph 41 / 41°F 87% 1012 mb
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: medium
55%
0.0 In
09:00

E
E

5 / 8 mph 39 / 35°F 100% 1011 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
15:00

ESE
ESE

5 / 11 mph 51 / 50°F 80% 1014 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
21:00

E
E

5 / 9 mph 39 / 35°F 100% 1012 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.3 In

Other Locations Near to Portage

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.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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