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Challis 14 Day Long Range Forecast

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

Idaho, United States Of America

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

Over the next 14 days the Challis 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 Sunday 26th. The mean minimum temperature will be 1°C, dipping to its lowest on the morning of Monday 20th at -3°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Thursday 23rd will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate. The strongest wind will be experienced on the afternoon of Friday 17th, coming from a westerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 17
May
02:00

SW
SW

8 / 17 mph 45 / 41°F 67%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SW
SW

11 / 21 mph 44 / 38°F 58%
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
08:00

WSW
WSW

18 / 21 mph 52 / 45°F 48%
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
11:00

WSW
WSW

25 / 28 mph 55 / 49°F 36%
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
14:00

W
W

27 / 31 mph 56 / 50°F 31%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

W
W

25 / 29 mph 52 / 45°F 25%
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
20:00

WNW
WNW

14 / 16 mph 44 / 37°F 34%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

3 / 5 mph 36 / 33°F 46%
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
Sat 18
May
02:00

WSW
WSW

3 / 5 mph 32 / 30°F 50%
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
05:00

WSW
WSW

4 / 7 mph 31 / 27°F 53%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SSW
SSW

4 / 5 mph 47 / 44°F 28%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WSW
WSW

11 / 13 mph 59 / 55°F 21%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 52%
Most Significant Cloud Type: high
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

20 / 23 mph 62 / 61°F 22%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 93%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WSW
WSW

20 / 23 mph 59 / 55°F 22%
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
20:00

WSW
WSW

5 / 9 mph 45 / 42°F 40%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSW
SSW

6 / 11 mph 42 / 39°F 46%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 94%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
02:00

SW
SW

7 / 15 mph 39 / 34°F 49%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

9 / 17 mph 37 / 31°F 55%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WSW
WSW

15 / 17 mph 45 / 38°F 31%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

W
W

16 / 18 mph 49 / 43°F 21%
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
14:00

WNW
WNW

18 / 21 mph 52 / 45°F 23%
Low level cloud: 0%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NW
NW

17 / 19 mph 48 / 41°F 32%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

N
N

7 / 8 mph 43 / 37°F 46%
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NNW
NNW

4 / 6 mph 34 / 31°F 61%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
02:00

NNW
NNW

4 / 6 mph 30 / 26°F 64%
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
05:00

NNW
NNW

3 / 6 mph 27 / 24°F 70%
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
08:00

NNE
NNE

5 / 6 mph 40 / 36°F 49%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NE
NE

6 / 6 mph 47 / 44°F 33%
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
14:00

NE
NE

5 / 6 mph 52 / 49°F 23%
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
17:00

NNE
NNE

6 / 7 mph 54 / 51°F 25%
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
20:00

NNW
NNW

8 / 10 mph 43 / 38°F 67%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 99%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WNW
WNW

4 / 4 mph 39 / 36°F 87%
Low level cloud: 15%
Mid level cloud: 28%
High level cloud: 19%
Most Significant Cloud Type: low
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 21
May
02:00

NW
NW

4 / 6 mph 32 / 29°F 90%
Low level cloud: 22%
Mid level cloud: 30%
High level cloud: 17%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

4 / 6 mph 30 / 26°F 89%
Low level cloud: 15%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNE
NNE

3 / 3 mph 41 / 39°F 73%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NE
NE

4 / 5 mph 51 / 48°F 48%
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
14:00

NNE
NNE

6 / 7 mph 58 / 56°F 29%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

W
W

9 / 11 mph 60 / 57°F 26%
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
20:00

WSW
WSW

11 / 13 mph 50 / 45°F 44%
Low level cloud: 0%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

5 / 5 mph 46 / 43°F 56%
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
02:00

WSW
WSW

2 / 2 mph 44 / 44°F 65%
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
05:00

SW
SW

4 / 5 mph 41 / 39°F 78%
Low level cloud: 3%
Mid level cloud: 95%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WSW
WSW

3 / 4 mph 45 / 43°F 65%
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 91%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

N
N

5 / 6 mph 44 / 42°F 77%
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 89%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NNE
NNE

4 / 6 mph 46 / 44°F 76%
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 95%
Most Significant Cloud Type: medium
37%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

WNW
WNW

11 / 14 mph 52 / 47°F 47%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

W
W

5 / 6 mph 44 / 40°F 66%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

NW
NW

4 / 5 mph 39 / 36°F 83%
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
02:00

NNW
NNW

2 / 2 mph 38 / 38°F 93%
Low level cloud: 63%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NE
NE

2 / 3 mph 39 / 38°F 82%
Low level cloud: 13%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNE
NNE

4 / 4 mph 42 / 38°F 71%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNE
NNE

9 / 11 mph 48 / 43°F 55%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

4 / 5 mph 44 / 42°F 68%
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
17:00

E
E

2 / 2 mph 41 / 41°F 86%
Low level cloud: 11%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
20:00

S
S

1 / 1 mph 40 / 39°F 93%
Low level cloud: 31%
Mid level cloud: 42%
High level cloud: 50%
Most Significant Cloud Type: low
52%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

W
W

3 / 6 mph 31 / 28°F 89%
Low level cloud: 5%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
05:00

SW
SW

6 / 11 mph 31 / 25°F 63%
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 6%
Most Significant Cloud Type: medium
100%
0.0 In
11:00

ESE
ESE

5 / 8 mph 46 / 43°F 50%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
17:00

WSW
WSW

6 / 13 mph 52 / 49°F 44%
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
0.0 In
23:00

W
W

5 / 10 mph 35 / 31°F 78%
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: medium
32%
0.0 In
Sat 25
May
05:00

SW
SW

6 / 13 mph 36 / 31°F 68%
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: medium
33%
0.0 In
11:00

W
W

4 / 7 mph 52 / 52°F 45%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: medium
19%
0.0 In
17:00

WSW
WSW

15 / 31 mph 62 / 62°F 35%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
0.0 In
23:00

WNW
WNW

4 / 9 mph 39 / 36°F 73%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 17%
Most Significant Cloud Type: medium
9%
0.1 In
Sun 26
May
05:00

SW
SW

6 / 14 mph 40 / 36°F 69%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: medium
13%
0.0 In
11:00

NE
NE

2 / 4 mph 57 / 58°F 38%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: medium
6%
0.0 In
17:00

NW
NW

15 / 31 mph 62 / 62°F 27%
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
23:00

W
W

6 / 12 mph 44 / 41°F 58%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 27
May
05:00

NW
NW

3 / 6 mph 38 / 36°F 71%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
11:00

NW
NW

2 / 5 mph 63 / 63°F 32%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
17:00

NNE
NNE

2 / 3 mph 54 / 54°F 52%
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 37%
Most Significant Cloud Type: medium
16%
0.1 In
23:00

WNW
WNW

4 / 9 mph 50 / 48°F 53%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Tue 28
May
05:00

WNW
WNW

3 / 6 mph 37 / 35°F 80%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.1 In
11:00

SSE
SSE

2 / 5 mph 67 / 67°F 30%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
17:00

ENE
ENE

6 / 13 mph 65 / 65°F 32%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
23:00

WSW
WSW

4 / 8 mph 53 / 53°F 49%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 29
May
05:00

SW
SW

5 / 10 mph 43 / 41°F 63%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
11:00

ESE
ESE

3 / 5 mph 72 / 73°F 25%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
17:00

SSW
SSW

9 / 19 mph 71 / 71°F 23%
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 26%
Most Significant Cloud Type: medium
50%
0.0 In
23:00

WSW
WSW

7 / 14 mph 56 / 54°F 42%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Thu 30
May
05:00

SW
SW

6 / 13 mph 47 / 44°F 57%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
11:00

WSW
WSW

8 / 17 mph 77 / 75°F 24%
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 8%
Most Significant Cloud Type: medium
18%
0.0 In
17:00

WSW
WSW

19 / 39 mph 67 / 67°F 28%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 14%
Most Significant Cloud Type: medium
2%
0.0 In
23:00

NW
NW

4 / 9 mph 55 / 54°F 58%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Fri 31
May
05:00

W
W

5 / 10 mph 40 / 37°F 61%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
11:00

E
E

2 / 5 mph 74 / 75°F 28%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.0 In
17:00

WSW
WSW

13 / 26 mph 63 / 63°F 21%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
23:00

W
W

5 / 11 mph 57 / 56°F 39%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 01
Jun
05:00

W
W

4 / 8 mph 38 / 36°F 49%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
0.0 In
11:00

E
E

3 / 6 mph 74 / 74°F 27%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
0.0 In
17:00

W
W

17 / 35 mph 67 / 67°F 27%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
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