San Juan

FB-SKY-001, Fig. ACloud classification

The ten cloud genera by height: the etages these layers fall in.

FB-SKY-017, Fig. AStratus

A cloud with its base at 2,500 ft is in the low etage, where stratus forms.

FB-SKY-016, Fig. AStratocumulus

A cloud with its base at 2,500 ft is in the low etage, where stratocumulus forms.

FB-SKY-018, Fig. ACumulus

A cloud with its base at 2,500 ft is in the low etage, where cumulus forms.

FB-WAT-002, Fig. CHumidity variables

The same lift, worked for another air: how the humidity climbs as the air rises and cools.

FB-ENG-011, Fig. AWater vapour as a gas

How much vapour air can hold at each temperature, which sets the dew point.

FB-ENG-005, Fig. ALapse rates and stability

The dry rate the lifted air cools at, against the air around it.

FB-EVT-150, Fig. AHigh wind

How 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 geometry

Why large scale winds turn, and blow round a low rather than into it.

FB-INS-002, Fig. AASOS

The mast the wind is measured on, 33 ft above the ground.

FB-ENG-001, Fig. AAtmosphere in section

The whole standard atmosphere this station stands in, from the ground to the edge of space.

FB-ENG-003, Fig. CHydrostatic balance

Why a barometer 9 ft up reads less: it weighs only the air above it.

FB-ENG-007, Fig. ARadiation budget

Where the sunlight that reaches this ground goes once it arrives.

FB-INS-002, Fig. AASOS

The airport station in full: every sensor, and how long each reading is averaged.

FB-INS-001, Fig. AWhat an instrument is

A surface station taken apart: what each of these sensors is.

FB-INS-009, Fig. AStevenson screen and siting

Why the thermometer sits in a shield 5 ft over grass.