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Iowa City 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Iowa City

Iowa, United States Of America

Long range weather outlook for Iowa City includes 14 day forecast summary:

Taking a look at Iowa City over the coming two weeks and the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 27°C expected on the afternoon of Wednesday 14th. The average minimum temperature will be 13°C, dipping to its lowest on the morning of Sunday 18th at 8°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 20th will have the most precipitation with an accumulation of around 19.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 12
May		00:00

ESE
ESE

 7 / 15 mph 58 / 56°F 72% 1018 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
03:00

ESE
ESE

 7 / 14 mph 54 / 53°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 5 / 10 mph 57 / 56°F 74% 1017 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
09:00

ESE
ESE

 7 / 8 mph 72 / 70°F 60% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 8 / 10 mph 80 / 79°F 48% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 17%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 10 / 12 mph 82 / 80°F 44% 1010 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 9 / 16 mph 75 / 76°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 6 / 13 mph 64 / 64°F 89% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May		18:00

SSW
SSW

 1 / 2 mph 79 / 78°F 70% 1005 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 13%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 1 / 2 mph 67 / 67°F 79% 1006 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May		00:00

S
S

 4 / 8 mph 64 / 64°F 85% 1005 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 10%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 6 / 13 mph 61 / 61°F 91% 1005 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
06:00

SSE
SSE

 5 / 10 mph 64 / 62°F 90% 1005 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 9 / 11 mph 75 / 77°F 71% 1005 mb
Low level cloud: 7%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 12 / 13 mph 80 / 80°F 57% 1003 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 9 / 11 mph 81 / 81°F 59% 1002 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 7 / 12 mph 79 / 79°F 68% 1001 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 8 / 17 mph 67 / 67°F 81% 1001 mb
Low level cloud: 3%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May		00:00

SE
SE

 13 / 23 mph 67 / 67°F 91% 999 mb
Low level cloud: 34%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSE
SSE

 13 / 20 mph 67 / 67°F 97% 998 mb
Low level cloud: 100%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 13 / 18 mph 69 / 68°F 94% 997 mb
Low level cloud: 84%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 17 / 19 mph 78 / 79°F 70% 995 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
12:00

SW
SW

 21 / 24 mph 80 / 81°F 56% 996 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

W
W

 19 / 22 mph 76 / 77°F 60% 999 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 15 / 26 mph 69 / 67°F 60% 1002 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 90%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 8 / 16 mph 62 / 62°F 64% 1004 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
Fri 16
May		00:00

SSW
SSW

 9 / 18 mph 58 / 56°F 59% 1003 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 12 / 26 mph 57 / 54°F 64% 1003 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 11 / 23 mph 59 / 56°F 78% 1003 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 19%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 15 / 18 mph 70 / 68°F 68% 1002 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 99%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 13 / 17 mph 70 / 69°F 61% 1002 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 93%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 12 / 18 mph 59 / 56°F 85% 1002 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
47%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 10 / 15 mph 66 / 65°F 75% 1001 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
21:00

WSW
WSW

 8 / 16 mph 56 / 54°F 69% 1003 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
Sat 17
May		00:00

WSW
WSW

 9 / 19 mph 53 / 50°F 75% 1004 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 39%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 9 / 19 mph 52 / 49°F 74% 1005 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 8 / 16 mph 54 / 50°F 79% 1007 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 15 / 17 mph 64 / 63°F 54% 1008 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 16 / 18 mph 71 / 69°F 47% 1009 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
15:00

WNW
WNW

 15 / 17 mph 73 / 76°F 46% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 7 / 11 mph 71 / 69°F 63% 1009 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 7 / 15 mph 60 / 60°F 70% 1010 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 18
May		00:00

NNE
NNE

 8 / 16 mph 53 / 51°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 10 / 19 mph 48 / 43°F 85% 1015 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
06:00

NNE
NNE

 8 / 11 mph 48 / 44°F 80% 1016 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
09:00

NNW
NNW

 8 / 10 mph 57 / 53°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 67%
Most Significant Cloud Type: high
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 12 / 14 mph 63 / 62°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 66%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 8 / 9 mph 67 / 64°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 17%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 8 mph 66 / 63°F 67% 1017 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 8 / 16 mph 54 / 51°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 19
May		00:00

ENE
ENE

 8 / 16 mph 60 / 60°F 95% 1008 mb
Low level cloud: 34%
Mid level cloud: 19%
High level cloud: 6%
Most Significant Cloud Type: low
41%
0.0 In
06:00

NNE
NNE

 8 / 12 mph 45 / 40°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

ENE
ENE

 5 / 9 mph 64 / 64°F 54% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

ESE
ESE

 20 / 39 mph 61 / 61°F 92% 1005 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
Tue 20
May		00:00

WNW
WNW

 15 / 31 mph 58 / 55°F 82% 1002 mb
Low level cloud: 51%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
96%
0.0 In
06:00

SSE
SSE

 16 / 33 mph 71 / 71°F 93% 1004 mb
Low level cloud: 58%
Mid level cloud: 11%
High level cloud: 9%
Most Significant Cloud Type: low
62%
0.0 In
12:00

WSW
WSW

 11 / 24 mph 78 / 81°F 77% 997 mb
Low level cloud: 85%
Mid level cloud: 63%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 21 / 43 mph 58 / 53°F 94% 1005 mb
Low level cloud: 100%
Mid level cloud: 23%
High level cloud: 62%
Most Significant Cloud Type: low
100%
0.0 In
Wed 21
May		00:00

S
S

 17 / 36 mph 65 / 65°F 95% 1000 mb
Low level cloud: 93%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
06:00

SSE
SSE

 10 / 21 mph 62 / 62°F 97% 996 mb
Low level cloud: 95%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
98%
1.1 In
12:00

W
W

 15 / 32 mph 75 / 77°F 52% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

WNW
WNW

 15 / 32 mph 52 / 47°F 92% 1002 mb
Low level cloud: 95%
Mid level cloud: 98%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
Thu 22
May		00:00

SSW
SSW

 5 / 11 mph 64 / 64°F 91% 1007 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NNW
NNW

 15 / 31 mph 45 / 38°F 91% 1010 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

 10 / 21 mph 73 / 77°F 61% 1011 mb
Low level cloud: 86%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.2 In
18:00

NNW
NNW

 9 / 20 mph 52 / 48°F 81% 1017 mb
Low level cloud: 90%
Mid level cloud: 94%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
Fri 23
May		00:00

NNE
NNE

 6 / 14 mph 54 / 52°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NW
NW

 9 / 18 mph 44 / 38°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

NW
NW

 11 / 23 mph 64 / 64°F 52% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

WNW
WNW

 4 / 9 mph 65 / 65°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 24
May		00:00

SE
SE

 6 / 13 mph 54 / 53°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

W
W

 6 / 12 mph 51 / 49°F 85% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

SSE
SSE

 15 / 30 mph 70 / 70°F 58% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 88%
Most Significant Cloud Type: medium
18%
0.0 In
18:00

SW
SW

 5 / 10 mph 70 / 70°F 69% 1013 mb
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 40%
Most Significant Cloud Type: medium
48%
0.0 In
Sun 25
May		00:00

W
W

 22 / 46 mph 57 / 53°F 87% 1006 mb
Low level cloud: 63%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.2 In
06:00

SSE
SSE

 6 / 13 mph 58 / 57°F 90% 1012 mb
Low level cloud: 5%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
12:00

NNW
NNW

 21 / 43 mph 55 / 49°F 58% 1020 mb
Low level cloud: 64%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.0 In
18:00

WNW
WNW

 6 / 13 mph 69 / 69°F 81% 1008 mb
Low level cloud: 50%
Mid level cloud: 70%
High level cloud: 78%
Most Significant Cloud Type: low
83%
0.0 In
Mon 26
May		00:00

N
N

 2 / 5 mph 47 / 47°F 82% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 15%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NE
NE

 13 / 26 mph 47 / 41°F 92% 1014 mb
Low level cloud: 73%
Mid level cloud: 88%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.2 In
12:00

S
S

 5 / 10 mph 58 / 58°F 51% 1026 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
0.0 In
18:00

N
N

 10 / 21 mph 54 / 51°F 75% 1019 mb
Low level cloud: 8%
Mid level cloud: 69%
High level cloud: 4%
Most Significant Cloud Type: medium
89%
0.0 In
Tue 27
May		00:00

ESE
ESE

 7 / 14 mph 50 / 47°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

NNW
NNW

 9 / 18 mph 48 / 44°F 90% 1023 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
0.0 In
12:00

ESE
ESE

 6 / 13 mph 52 / 50°F 84% 1020 mb
Low level cloud: 69%
Mid level cloud: 70%
High level cloud: 5%
Most Significant Cloud Type: low
94%
0.0 In
18:00

NW
NW

 4 / 9 mph 64 / 64°F 69% 1021 mb
Low level cloud: 6%
Mid level cloud: 21%
High level cloud: 10%
Most Significant Cloud Type: medium
38%
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