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Major rainfall event

KALB
KALB(KALB)
Published: Apr. 3, 2017 at 11:00 PM CDT
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A classic excessive rainfall event soaked central Louisiana Sunday, Sunday night, and very early Monday. The prolific rain was caused by a strong disturbance aloft moving over the region where warm, moist air was in place. The tremendous vertical motion associated with the disturbance activated the atmosphere and produced clouds, rain, and thunderstorms.

Data from the KALB-TV weather watchers network reveals some of the details of this major rainfall episode. The highest totals occurred along an axis that stretched roughly from DeRidder-Leesville to near Jena. It was along this zone that convective system basically stalled while the individual cells traveled over the same area repeatedly, a phenomenon knows as "training."

As you know, rain amounts can vary greatly over short distances. In between the points on the graphic, the numbers show even higher totals were observed.

Simpson...12.00

Cotile Lake...10.62

Downs Lane...10.61

Pitkin...10.42

Ball...9.90

Pickering...9.82

Fort Polk...9.62

Cherokee Village...9.57

Brame Energy Center (near Boyce)...9.50

This magnitude of rain in one day is highly unusual. From a historical perspective, a 12-inch rain in any 24-hour period occurs only once every 50 years on the average. Stated another way, there is only a 2% chance that any year will produce such a high amount of rain. A 10-inch rain occurs once every 25 years, or a 4% chance of happening in any given year.

Area lakes and rivers have responded to this deluge with rapid rises. Bayou Anacoco near Rosepine rose 16.5 feet in one day. Big Creek near Pollock jumped 10.6 feet, and Little River near Rochelle rose 8.2 feet. For the latest information on lakes and rivers near you, select the link to the right of this column that reads "The latest on lake and river stages in Central Louisiana."

The latest on lake and river stages in Central Louisiana can be found here: www.kalb.com/content/misc/283402721.html

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