Surface observations · north Georgia

The back / forty
surface record

One weather station in one backyard, read straight off the sensors over the local network. Every number on this page came from hardware on this property. Nothing is pulled from a forecast, a model, or anybody else's station.

How to read the station plot

Circle

Sky cover. Filled fraction is the estimated cloudiness — derived by comparing the pyranometer against clear-sky irradiance for this latitude, so it only means anything while the sun is up.

Upper left

Air temperature, °F, from the shaded sensor on the screen porch.

Lower left

Dew point, °F. The gap between it and the temperature is how dry the air is.

Upper right

Sea-level pressure in the standard 3-digit code: last three digits of the pressure in tenths of a millibar. 132 means 1013.2 mb.

Right

Pressure tendency — the change over the last three hours. Falling pressure is the classic sign of weather on the way.

Shaft

Wind, pointing in the direction the wind is coming from. Each full barb is 10 knots, each half barb 5. A bare circle means calm.