The Kenya Meteorological Service Authority (KMSA) has stepped up efforts to help Kenyans understand weather forecasts by breaking down key rainfall terms that often confuse the public.
In a fresh awareness campaign, the agency has explained that many of the words used in daily forecasts are not random but are based on clear scientific measurements.
These terms describe both how widely rainfall will be spread and how intense it is expected to be.
According to KMSA, misunderstanding these terms can lead to poor planning, especially during the rainy season when accurate information is critical for farmers, motorists, and households.
The agency said the initiative aims to make weather communication clearer and more useful for ordinary citizens who rely on daily forecasts to make decisions.
“Understanding rainfall terms helps you stay prepared and safe. Be weather-wise. Stay informed. Stay safe,” the agency stated.
Kenya Met on How Rain is Spread
KMSA explained that some forecast terms focus on how much rainfall a region will receive.
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For instance, the term “few places” means that less than 33 percent of a region is expected to receive rain.
This suggests that most areas will remain dry, with rainfall limited to a few locations.
“Several places”, on the other hand, indicates that between 33 and 66 percent of the area will experience rain.
In this case, rainfall will occur in multiple locations, but not in the majority of the region.
When forecasters use “most places,” it means more than 66 per cent of the region is likely to receive rainfall, signalling that rain will affect nearly the entire area.
The agency also uses terms such as “isolated,” “scattered,” “numerous,” and “widespread” to describe rainfall distribution.
“Isolated” refers to rainfall affecting less than 25 per cent of an area, while “scattered” means between 25 and 50 per cent of the region will receive rain.
“Numerous” indicates rainfall in 51 to 70 per cent of the area, while “widespread” means more than 70 per cent of the region will be affected.
KMSA stressed that these terms only describe how widespread rainfall will be, not how heavy it will be in a specific place.
Measuring How Heavy Rain Will Be
In addition to coverage, the agency has also explained how rainfall intensity is measured within a 24-hour period.
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“Light rainfall” refers to amounts of less than 5 millimetres and is often experienced as drizzle or gentle rain.
This type of rain usually causes little disruption.
“Moderate rainfall” ranges between 5 and 20 millimetres and is described as steady and noticeable rain that may affect outdoor activities.
“Heavy rainfall” is defined as between 21 and 50 millimetres.
Kenya Met warned that this level of rain can be intense and may come with thunderstorms, posing risks such as flooding and poor visibility.
“Very heavy rainfall” refers to more than 50 millimetres within 24 hours.
This type of prolonged rainfall can lead to serious hazards, including flash floods and property damage.
The agency said that combining information on rainfall coverage and intensity gives a clearer picture of what to expect on the ground.
Kenya Met has urged Kenyans to pay closer attention to these terms in weather updates, noting that a better understanding can improve preparedness and reduce risks.
The move is part of a wider push to promote anticipatory action, in which early warnings help communities prepare for extreme weather events.
The authority encouraged the public to follow official weather updates and use them to plan daily activities, travel, and farming operations.
