![]() ![]() The map of rainfall totals above shows observed 4-day total rainfall at selected stations, with reference to recurrence intervals. The influences of these tropical systems was magnified by a stalled cold front, just as it was in October 2015.įor precipitation, the standard scientific estimates for the probability of rainfall exceeding certain thresholds (also called recurrence intervals) is documented in NOAA’s Atlas 14. In the 1990 case, the remnants of Tropical Storm Klaus brought extensive moisture near the SC coast, while Tropical Storm Marco crossed the region from south to north. In some isolated spots, rainfall exceeded 12 inches. In 1990, over 8 inches of rain fell between October 10 and 13 in the Savannah, Edisto, Yadkin–Pee Dee, and Catawba River Basins of North and South Carolina and Georgia. Tropical storms often interact with mid-latitude weather features like upper level lows, as happened in this event. This contributed to higher evaporation rates over the Atlantic, feeding more moisture into the weather systems. Sea-surface temperatures (SSTs) in the Atlantic were approximately 1.5-2.50☌ (3-4.50☏) warmer than average at the beginning of October 2015. While the rainfall amounts leading up to October 4 were near-normal in many places, they exceeded 7 inches at several coastal stations north of Charleston, from Georgetown to North Myrtle Beach, and at stations in the greater Columbia area. Soils were already saturated in many areas prior to the heaviest rainfall on Sunday, October 4, which may have affected patterns of flooding. Understanding current climate conditions and previous events that produced similar rainfall amounts places this event in the context of the multiple factors that contribute to the severity of rainfall and flooding events. ![]()
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