A cloud flash is a type of electrical discharge within a thunderstorm, specifically one that originates in a particular way and can lead to other phenomena.
Understanding Cloud Flashes
Cloud flashes, also known as intracloud (IC) lightning, are the most common type of lightning. The defining characteristic that dictates the exact definition is the initiation location and direction of the discharge.
According to the provided reference, a specific type of cloud flash:
- Initiates between the upper main positive charge region and a small negative charged screening layer on the upper boundary of the storm. This specific type of cloud flash can then lead to the development of a Blue Jet.
- The positive end of the leader "fills" the small negative potential well and continues upward beyond the upper extent of the thunderstorm, potentially resulting in a Blue Jet.
Types of Cloud Flashes
While the provided reference describes a specific type of cloud flash that results in a Blue Jet, it's important to understand that the term "cloud flash" generally refers to lightning that occurs within a cloud. This is in contrast to cloud-to-ground lightning or other types of discharges. Cloud flashes can take many forms and occur at varying altitudes within a thunderstorm.
Cloud Flash Leading to Blue Jets
The reference highlights a very specific type of cloud flash.
| Characteristic | Description |
|---|---|
| Initiation Point | Between the upper positive charge region and a small negative charge layer at the top of the storm. |
| Leader Behavior | The positive end of the leader fills a negative potential well and then propagates upward beyond the cloud's boundary. |
| Resulting Phenomenon | A Blue Jet, which is an upward-directed electrical discharge from the top of a thunderstorm. |
In summary, while cloud flashes are generally considered lightning within a cloud, there are very specific types, like the one described in the reference, that are important for triggering other atmospheric phenomena, such as Blue Jets.
