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Lake Whatcom 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Lake Whatcom

Washington, United States Of America

Long range weather outlook for Lake Whatcom includes 14 day forecast summary:

Over the next 14 days the Lake Whatcom forecast suggests the average daytime maximum temperature will be around 14°C, with a high for the two weeks of 18°C expected on the afternoon of Saturday 25th. The average minimum temperature will be 6°C, dipping to its lowest on the morning of Monday 20th at 4°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. It looks like Tuesday 21st will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		01:00

SW
SW

 10 / 16 mph 45 / 40°F 89% 1014 mb
Low level cloud: 86%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

W
W

 1 / 1 mph 45 / 45°F 88% 1015 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

WSW
WSW

 6 / 9 mph 49 / 46°F 83% 1018 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

W
W

 7 / 8 mph 52 / 48°F 76% 1020 mb
Low level cloud: 60%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 7 / 9 mph 56 / 53°F 63% 1021 mb
Low level cloud: 9%
Mid level cloud: 38%
High level cloud: 21%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 9 / 10 mph 56 / 52°F 63% 1020 mb
Low level cloud: 25%
Mid level cloud: 25%
High level cloud: 69%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 9 / 12 mph 50 / 47°F 74% 1019 mb
Low level cloud: 22%
Mid level cloud: 92%
High level cloud: 6%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 7 / 12 mph 45 / 41°F 87% 1019 mb
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		16:00

SSW
SSW

 4 / 5 mph 53 / 50°F 75% 1017 mb
Low level cloud: 49%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 3 / 4 mph 49 / 48°F 86% 1017 mb
Low level cloud: 27%
Mid level cloud: 28%
High level cloud: 5%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 5 / 10 mph 41 / 38°F 93% 1019 mb
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

SE
SE

 6 / 11 mph 42 / 38°F 92% 1020 mb
Low level cloud: 71%
Mid level cloud: 99%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 6 / 9 mph 45 / 41°F 93% 1021 mb
Low level cloud: 37%
Mid level cloud: 71%
High level cloud: 3%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 6 / 7 mph 48 / 45°F 89% 1023 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 6 / 7 mph 53 / 50°F 73% 1023 mb
Low level cloud: 64%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 5 mph 57 / 55°F 63% 1024 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 4 / 5 mph 58 / 56°F 57% 1024 mb
Low level cloud: 4%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 2 / 3 mph 53 / 51°F 70% 1023 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

SE
SE

 4 / 9 mph 43 / 40°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

ESE
ESE

 5 / 11 mph 41 / 37°F 82% 1024 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 4 / 9 mph 39 / 36°F 86% 1024 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 22%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 2 / 2 mph 53 / 51°F 71% 1024 mb
Low level cloud: 3%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 5 / 6 mph 58 / 56°F 61% 1024 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 5 / 6 mph 62 / 59°F 57% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 4 / 5 mph 63 / 61°F 48% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 22%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 5 / 10 mph 54 / 51°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 31%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 9 / 18 mph 46 / 41°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

SSE
SSE

 12 / 21 mph 47 / 41°F 79% 1019 mb
Low level cloud: 1%
Mid level cloud: 37%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 7 / 12 mph 46 / 43°F 87% 1019 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 7 / 10 mph 47 / 43°F 95% 1018 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SSE
SSE

 6 / 7 mph 49 / 46°F 96% 1017 mb
Low level cloud: 97%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
13:00

SSE
SSE

 3 / 4 mph 50 / 49°F 95% 1016 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SSE
SSE

 6 / 7 mph 50 / 48°F 97% 1014 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSE
SSE

 9 / 13 mph 50 / 46°F 97% 1013 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 74%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

 11 / 15 mph 49 / 44°F 94% 1013 mb
Low level cloud: 90%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May		01:00

SSW
SSW

 11 / 15 mph 46 / 41°F 91% 1012 mb
Low level cloud: 54%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 6 / 11 mph 43 / 40°F 89% 1013 mb
Low level cloud: 47%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 4 / 5 mph 48 / 46°F 83% 1013 mb
Low level cloud: 22%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 6 / 6 mph 52 / 50°F 65% 1013 mb
Low level cloud: 75%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 6 / 6 mph 53 / 51°F 62% 1013 mb
Low level cloud: 15%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 2 / 3 mph 55 / 53°F 64% 1014 mb
Low level cloud: 1%
Mid level cloud: 66%
High level cloud: 82%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 2 / 2 mph 52 / 50°F 73% 1014 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 5 mph 42 / 41°F 87% 1016 mb
Low level cloud: 8%
Mid level cloud: 36%
High level cloud: 22%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

E
E

 3 / 7 mph 40 / 38°F 89% 1016 mb
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 4 / 7 mph 42 / 40°F 84% 1017 mb
Low level cloud: 45%
Mid level cloud: 51%
High level cloud: 32%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 3 / 3 mph 50 / 49°F 71% 1017 mb
Low level cloud: 92%
Mid level cloud: 88%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 5 / 5 mph 55 / 54°F 60% 1017 mb
Low level cloud: 95%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 4 / 4 mph 58 / 57°F 59% 1017 mb
Low level cloud: 61%
Mid level cloud: 43%
High level cloud: 11%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 4 / 5 mph 60 / 58°F 60% 1016 mb
Low level cloud: 30%
Mid level cloud: 48%
High level cloud: 5%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 3 / 5 mph 52 / 52°F 72% 1016 mb
Low level cloud: 20%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 7 mph 51 / 50°F 73% 1016 mb
Low level cloud: 61%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
94%
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		04:00

SE
SE

 3 / 6 mph 48 / 48°F 90% 1016 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
10:00

NW
NW

 2 / 4 mph 61 / 61°F 61% 1017 mb
Low level cloud: 35%
Mid level cloud: 23%
High level cloud: 6%
Most Significant Cloud Type: low
44%
0.0 In
16:00

WSW
WSW

 4 / 9 mph 67 / 67°F 53% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 25%
Most Significant Cloud Type: medium
3%
0.0 In
22:00

SE
SE

 6 / 13 mph 48 / 45°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 25
May		04:00

SSE
SSE

 7 / 15 mph 49 / 46°F 91% 1013 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
10:00

SW
SW

 5 / 11 mph 62 / 62°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
16:00

WSW
WSW

 4 / 8 mph 65 / 65°F 58% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
0.0 In
22:00

SE
SE

 9 / 19 mph 49 / 45°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: medium
11%
0.0 In
Sun 26
May		04:00

SE
SE

 5 / 11 mph 49 / 46°F 83% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
10:00

S
S

 7 / 13 mph 54 / 51°F 79% 1018 mb
Low level cloud: 88%
Mid level cloud: 29%
High level cloud: 73%
Most Significant Cloud Type: low
100%
0.0 In
16:00

SW
SW

 4 / 9 mph 65 / 65°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: medium
11%
0.0 In
22:00

SSE
SSE

 6 / 11 mph 50 / 48°F 85% 1018 mb
Low level cloud: 21%
Mid level cloud: 58%
High level cloud: 96%
Most Significant Cloud Type: low
52%
0.0 In
Mon 27
May		04:00

SE
SE

 5 / 11 mph 47 / 45°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
10:00

S
S

 8 / 15 mph 51 / 48°F 82% 1019 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
16:00

SW
SW

 5 / 10 mph 67 / 67°F 56% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

S
S

 6 / 10 mph 49 / 47°F 96% 1019 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.3 In
Tue 28
May		04:00

SE
SE

 6 / 12 mph 50 / 48°F 87% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
8%
0.0 In
10:00

SSW
SSW

 6 / 11 mph 50 / 48°F 89% 1019 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 56%
Most Significant Cloud Type: low
100%
0.0 In
16:00

WSW
WSW

 3 / 7 mph 72 / 76°F 61% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

SE
SE

 9 / 18 mph 42 / 36°F 80% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 21%
Most Significant Cloud Type: medium
22%
0.0 In
Wed 29
May		04:00

SSE
SSE

 8 / 17 mph 52 / 49°F 94% 1013 mb
Low level cloud: 7%
Mid level cloud: 23%
High level cloud: 80%
Most Significant Cloud Type: medium
45%
0.0 In
10:00

SSW
SSW

 7 / 13 mph 52 / 50°F 67% 1022 mb
Low level cloud: 74%
Mid level cloud: 76%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.0 In
16:00

SSE
SSE

 5 / 11 mph 57 / 56°F 97% 1012 mb
Low level cloud: 69%
Mid level cloud: 96%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.1 In
22:00

ESE
ESE

 5 / 11 mph 46 / 43°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 25%
Most Significant Cloud Type: medium
10%
0.0 In
Thu 30
May		04:00

S
S

 10 / 20 mph 46 / 41°F 95% 1020 mb
Low level cloud: 87%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
10:00

SW
SW

 5 / 11 mph 61 / 61°F 59% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
0.0 In
16:00

WSW
WSW

 3 / 6 mph 65 / 65°F 54% 1024 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.1 In
22:00

SE
SE

 9 / 19 mph 49 / 45°F 79% 1020 mb
Low level cloud: 0%
Mid level cloud: 52%
High level cloud: 8%
Most Significant Cloud Type: medium
52%
0.0 In
Fri 31
May		04:00

E
E

 2 / 5 mph 45 / 45°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: medium
44%
0.0 In
10:00

S
S

 4 / 8 mph 54 / 53°F 91% 1020 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
16:00

NW
NW

 3 / 7 mph 60 / 60°F 65% 1016 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
0.0 In
22:00

SSW
SSW

 4 / 8 mph 54 / 53°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.7 In
Sat 01
Jun		04:00

S
S

 9 / 18 mph 49 / 45°F 87% 1018 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
10:00

SSW
SSW

 8 / 17 mph 56 / 54°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.1 In
16:00

SW
SW

 4 / 9 mph 63 / 63°F 59% 1020 mb
Low level cloud: 3%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.1 In
22:00

SSE
SSE

 4 / 9 mph 49 / 47°F 93% 1014 mb
Low level cloud: 55%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
71%
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