Weather/Illinois/Instruments/N9AZZ
In a volunteer observer's own ground
CWOP network, identified by the register
Now, today, and the week
On the radar over Citizen station N9AZZReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture
Drawn as the kind of place it stands at. 1,767 instruments in Illinois stand at one.
-in
Snow on the ground
Station charts
Against its reference: each temperature this station reports is compared with the nearest airport or climate reference station that reported within half an hour, up to 15 miles away. The figure is its reading less the reference's, on average, as both were reported; the typical difference is the root mean square. The difference in height is shown where both heights are known.
| Share of scheduled reports received | Stations |
|---|---|
| 100% | 505 |
| 90 to 99% | 318 |
| 80 to 89% | 33 |
| 70 to 79% | 22 |
| 60 to 69% | 200 |
| 50 to 59% | 12 |
| 40 to 49% | 12 |
| 30 to 39% | 25 |
| 20 to 29% | 2 |
| 10 to 19% | 32 |
| 0 to 9% | 1 |
Station report
Drawn from its report of undefined, in the manner of the Field Book, and opened beside the plates that explain each part of it.
Calm.
FB-EVT-150, Fig. AHigh windHow a high wind reaches the ground, and the strengths a warning is issued at (40 mph sustained, 58 mph gusts).
FB-ENG-008, Fig. ACoriolis as geometryWhy large scale winds turn, and blow round a low rather than into it.
At 426 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.46 inHg and the temperature at 57.5 F; the station's altimeter setting of 30.18 inHg means its barometer reads 29.72 inHg; it reports 55.0 F, 2.5 F colder than standard.
FB-ENG-001, Fig. AAtmosphere in sectionThe whole standard atmosphere this station stands in, from the ground to the edge of space.
FB-ENG-003, Fig. CHydrostatic balanceWhy a barometer 426 ft up reads less: it weighs only the air above it.
On Oct 4 the noon sun stands 48 degrees above the horizon at 37.77 N, and the day is 11 h 32 min long. Level ground there takes 74 per cent of the noon sunlight a surface facing the sun would.
FB-ENG-007, Fig. ARadiation budgetWhere the sunlight that reaches this ground goes once it arrives.
A weather instrument, 426 ft above sea level. Its latest report is written on the sensors that made it.
FB-INS-001, Fig. AWhat an instrument isA surface station taken apart: what each of these sensors is.
1 place reads it as one of the nearest to it.