Vihmasadu

Vihmasadu is a meteorological term used in Estonian to describe a localized, short-duration rain event. It involves a rapid onset of rainfall that covers a relatively small area and often lasts only minutes to about an hour.

Vihmasadu is typically produced by convective clouds, such as cumulus or cumulonimbus, in warm, moist air. Rainfall intensity can vary from light showers to heavy downpours, and the wind is often gusty. Depending on the cloud type, the shower may be accompanied by thunder and lightning, or occur without electrical activity.

Forecasting and observation rely on weather radar and high-resolution models to track the shower as it moves with the wind. Because vihmasadu is localized, forecasts usually indicate a chance of showers rather than widespread rain.

In Estonia and other Northern European regions, vihmasadu is most common during warmer months when atmospheric instability is greater, often in the late spring and summer. It can occur at various times, but commonly appears in the afternoon.

Impact and safety considerations include reduced visibility, slick roads, and possible localized flooding if rainfall rates are high. Outdoor plans are best adjusted by consulting local forecasts and carrying weather protection.