Lightning Jump: the electrical signal that reveals a rapidly intensifying storm
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A Lightning Jump is one of the most useful operational signals in convective monitoring because it helps identify when a storm is beginning to intensify rapidly, often before its most severe impacts become evident at the surface. In the images provided, the convective cell displays JUMP status, with maximum values ranging from 61 to 67 flashes per cell and a high sigma signal. This means that the flash rate increased abruptly compared with the storm’s previous electrical behavior.
From a physical standpoint, this sudden increase in lightning activity is usually associated with a strengthening updraft. When the vertical motion inside the cloud intensifies, the storm becomes more efficient at transporting supercooled water droplets, ice crystals, and graupel into the mixed-phase region, typically located between 0 °C and -20 °C. Within that layer, frequent collisions occur among ice particles, which promotes charge separation. As a result, the storm rapidly increases its electrical output and produces a noticeable spike in lightning activity.
The CIRA infrared satellite image strongly supports this interpretation. It shows very cold cloud tops, convective expansion, and a deep, organized structure consistent with strong vertical development. The most intense colors in the infrared product suggest very low cloud-top temperatures, often associated with vigorous ascent and strong convective growth. When this satellite signature coincides with a sudden increase in lightning rate, confidence rises that the storm is undergoing a genuine intensification process rather than only a brief fluctuation.
Operationally, a Lightning Jump should not be interpreted as automatic confirmation of severe weather. However, it is an extremely valuable early warning indicator. A storm that experiences a significant electrical jump may be entering a more hazardous phase, with increasing potential for hail, damaging downburst winds, heavy rainfall, severe turbulence, and frequent lightning. In some cases, it may also signal improved storm organization or a transition toward a more persistent and potentially severe convective structure.
Correct interpretation requires integrating the lightning signal with other meteorological fields and products. Lightning Jump analysis is most effective when combined with cloud-top temperature, rapid cloud-top cooling, radar reflectivity, radial velocity, thermodynamic instability, vertical wind shear, CAPE, precipitable water, and surface observations. If the jump occurs simultaneously with cold cloud tops, explosive vertical growth, strong radar echoes, and a favorable environmental background, the convective threat level should be raised in operational surveillance and warning decision-making.
In practical forecasting, Lightning Jump techniques are especially useful because they provide a timely, objective, and quantifiable measure of storm evolution. Unlike surface observations, which often detect impacts only after they begin, lightning-based diagnostics can highlight internal storm changes earlier in the life cycle. This gives forecasters additional lead time to anticipate hazardous evolution, refine short-term warnings, and communicate growing risk to aviation, civil protection, and other users.
In summary, the images show a storm with anomalous electrical behavior and satellite signatures consistent with deep convection. For the operational forecaster, a Lightning Jump acts as an early electrical alarm embedded within the convective life cycle. It does not replace a full meteorological analysis, but it adds a fast and highly valuable signal for anticipating the intensification of a potentially severe storm.
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@tornadouy Hi, thank you for your Lightning Jump suggestion and for the detailed description. I looked up different algorithms used to calculate it, and we will discuss it with our colleagues to see whether it could be reliably implemented with our lightning data.
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@Jari-Sochorová muchas gracias por considerarlo ! Estamos trabajando con el Geonescast para poder utilizar el algoritmo del LJ, falta validarlo con casos. Estamos en esta instancia ahora.
Técnico Meteorólogo Fernando Torena -
We use another app to obtain the coordinates of lightning strikes to track and investigate wildfire ignition. It would be great to see ground strikes for the past 24 hours with an easy way to copy coordinates so they can then be pasted into an aviation-navigation app.
