The hydrological phenomena of rain bombs are intense – but typically short-lived – bursts of heavy localized rainfall.
Saturday there will be more widespread showers and thunderstorms with the potential for localized heavy rain and flash flooding.
Today will be cloudy with showers and thunderstorms with localized heavy rain; temperatures will be in the mid to upper 70's.
Friday highs will be in the mid 80's to low 90's and humid with scattered showers and thunderstorms; localized heavy rain and flash flooding potential.
The added-value of the radar network in terms of QPE with respect to the hourly raingauge network is larger for localized convection rain events as well as for the smallest space time scales which are those of interest for flash-flood prediction in the region.
Localized convective rain forecasts are often misplaced in space and/or time, causing inefficiencies in risk mitigation activities.
The error models are shown to depend on the type of rain event (Cévennes rain events, localized convection, widespread rainfall) and physical parameters such as the 0 °C isotherm altitude and the rain intermittency.
Observers stationed near lahar source areas are in a position to see or hear localized convection-cell rain storms that can trigger lahars, and human hearing can be very effective in detecting the approaching lahars themselves, often minutes before they come into view.
