● 5 min ago
| Location | Herndon - Forecast |
| Provided by | ca.gov from cwwp2.dot.ca.gov |
Yesterday & Today
Comparison of the image from the last available time (right) with the image from 24 hours ago (left).
| Location | Herndon - Forecast |
| Provided by | ca.gov from cwwp2.dot.ca.gov |
For this output data, temperature is shown for 2 m above ground. The calculations take into account the terrain (elevation), but with lower resolution than in reality. Therefore the models cannot differentiate, for instance, the temperature on a mountain peak or on a city square scorched by the sun. The general rule is that the centres of large cities are 1 °C to 3 °C warmer than the surrounding area or natural landscapes. Significant temperature differences over a small area are primarily caused in the winter by an inversion. A short yet noticeable cooling can also occur after a local summer storm.