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The FSR includes values for two key variables mapped across the UK: the M5-60 minutes rainfall, and the ratio "r". M5-60 minutes rainfall is the expected depth of rainfall in millimetres (mm) from a storm lasting 60 minutes (1 hour) with a return period of 5 years (hence M5). M5-2 days rainfall is the expected depth of rainfall from a storm ...
Rainfall amounts could reach 30–50 millimetres (1.2–2.0 in) widely, with potentially higher amounts of 60–80 millimetres (2.4–3.1 in) across high ground like the Mournes. Despite recent dry weather, this could lead to flooding and disrupt transportation. [40]
The time of maximum precipitation during the day gradually varies from late afternoon near the slopes of the Rockies to early morning near the Ohio River valley, [37] in part reflecting the west-to-east propagation of mesoscale convective systems. Mesoscale convective systems bring 30 to 70 percent of the annual warm season rainfall to the ...
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The heaviest rain occurred in January when 9 inches was totaled for the full month, followed by 7.95 in June, 6.04 in April, and 5.13 in August. All other months were under 4.81 recorded Tuesday.
According to the National Hurricane Center, rain-driven flooding killed two-thirds of the 41 people lost in 2001’s Tropical Storm Allison and 95 percent of the 68 people who died in 2017’s ...
An intensity-duration-frequency curve (IDF curve) is a mathematical function that relates the intensity of an event (e.g. rainfall) with its duration and frequency of occurrence. [1] Frequency is the inverse of the probability of occurrence. These curves are commonly used in hydrology for flood forecasting and civil engineering for urban ...