Insider Blog: Continued heavy rainfall makes flash flooding a potential risk

As persistent rain has fallen over the last several days and is expected to continue tomorrow, the potential for flash flooding is becoming an increasing concern. A consistent heavy rain brought nearly 1.5" of accumulation in Columbia yesterday, with Sanborn Field at the University of Missouri reporting 1.39" of rainfall, and Columbia Regional Airport reporting 1.37" of accumulation. Most of the region saw at least half an inch of rainfall.

Flash flooding can occur with as little of 1-2 inches of rainfall in a short period (1-3 hours). While yesterday's rate of precipitation was not that high, because of heavy saturation over the last two days, chances for flash flooding have increased. This is because the ground is unable to hold as much water, so puddling and areas of flooding can occur.

As of 4:00 pm today, Sanborn Field is reporting 1.09" of accumulation, with the airport reporting 0.72". Most of the rainfall over the last 24 hours has been along and south of I-70. but areas as far north as Moberly have received up to 0.10" of rain. California, Versailles, and Camdenton are reporting nearly 2" of accumulation over the last day. These areas are at more of a risk for flash flooding because of their increased amounts of accumulation.

More heavy rain is expected tomorrow and early Monday, with some spots expected to receive over 1.5" of further rainfall, though most of the viewing area will hover around 1/4 to 1 inch.

If you encounter a flooded roadway, never attempt to drive through it. Always "turn around, don't drown".