Editing Wildfire (section)

=== Intensity variations during day and night ===
[[File:Incendio en Caracas (4515878847).jpg|thumb|A wildfire in Venezuela during a [[drought]]]]Intensity also increases during daytime hours. Burn rates of smoldering logs are up to five times greater during the day due to lower humidity, increased temperatures, and increased wind speeds.<ref>de Souza Costa and Sandberg, 228</ref> Sunlight warms the ground during the day which creates air currents that travel uphill. At night the land cools, creating air currents that travel downhill. Wildfires are fanned by these winds and often follow the air currents over hills and through valleys.<ref>''National Wildfire Coordinating Group Communicator's Guide For Wildland Fire Management'', 5.</ref> Fires in Europe occur frequently during the hours of 12:00&nbsp;p.m. and 2:00&nbsp;p.m.<ref>San-Miguel-Ayanz, ''et al.'', 364.</ref> Wildfire suppression operations in the United States revolve around a 24-hour ''fire day'' that begins at 10:00&nbsp;a.m. due to the predictable increase in intensity resulting from the daytime warmth.<ref>''Glossary of Wildland Fire Terminology'', 73.</ref>