Classification of cold pool events
The Hobo dataset contains ~230 nights between October 2001 and June 2002. The cold air pool evolves following several patterns depending on:
• Wind direction and speed aloft
• Cloud cover, fog
• Soil conditions (snow cover, soil moisture)
• Humidity
The strongest inversions (~30°C) appear on clear nights with fresh snow.
Classification:
click for example |
type | cause of the disturbance |
 |
undisturbed
night click for |
X |
 |
late buildup | after front passage, weakening winds, dissolving clouds |
 |
early breakup | front passage, strong winds, clouds |
 |
turbulent erosion, partly mixing | steady winds, quiet strong |
 |
mixing event (partly mixing) | wind gusts |
 |
upper disturbance (no mixing) | weak winds |
 |
lower disturbances (no mixing) | maybe clouds moving over the area - backradiation? |
 |
cold pool window | cloud-gap, short calm period |
 |
multi-day cold pool | fresh snow, snow-covered trees, low angle of sun |
