December 15th - 17th Heavy Rainfall Event

 

OVERALL RAINFALL TOTALS FOR THE ENTIRE 48 HOUR PERIOD (December 15th 7 AM through December 17th 6 AM)

A solid 1 to 3 inches of rainfall fell across the entire Huntsville forecast area during this time. The heavier amounts  between 2 and 3 inches fell primarily in southern middle Tennessee along with Cullman and portions of Lauderdale and Lawrence counties in Alabama.  This rainfall did cause many area streams and rivers to have rapid rises, but since streamflows prior to the rainfall were so low, no major impacts were experienced due to these rises.

  Highest observed rainfall totals for each county: 

Rainfall totals December 15th 7 AM through December 17th at 6 AM

Location

County/State

Rainfall Total

 Huntsville 7.0 SE  Madison, AL  2.51
 Moulton TVA  Lawrence, AL  2.47
 Lynchburg  Moore, TN  2.45
 Taylortown  Lincoln, TN  2.07
 Cullman  Cullman, AL  1.85
 Winchester Dry Creek  Franklin, TN  1.84
 Larkinsville   Jackson, AL  1.81
 Henagar  Dekalb, AL  1.72
 Capshaw  Limestone, AL  1.59
 Guntersville Dam  Marshall, AL  1.59
 Falkville  Morgan, AL  1.52
 Wright  Lauderdale, AL  1.42
 Littleville 0.8 NE  Colbert, AL  1.37
 Dime  Franklin, AL  1.21

 

OVERVIEW OF THE EVENT

First Wave of Heavy Rainfall

On Saturday afternoon (December 15th), a weakening frontal boundary approached southern middle Tennessee and northwestern Alabama. The front produced some strong thunderstorms which lead to localized heavy rainfall across much of northwest Alabama and southern middle Tennessee heading into Sunday morning.

 

Rainfall totals from 12/15/2012 7 AM through 12/16/2012 6 AM:

 

Axis of heavier rainfall was primarily located along and west of Interstate 65. Click here to see a list of observed rainfall totals during the timeframe listed above the image.

 

 

Second Wave of Heavier Rainfall

By Sunday morning, a strong moisture flow originating in the tropics was situated along and south of the front, which at the time was located just south of the WFO Huntsville forecast area. Going into the afternoon and evening hours Sunday, moderate to occasional heavy rainfall continued along this boundary as it meandered across northern Alabama. The front then pushed southward into central and southern Alabama Monday morning (December 17th). Some rain and light drizzle continued through the morning hours on Monday.

 

Rainfall totals from 12/16/2012 7 AM through 12/17/2012 6 AM:

 

As the front moved further to the south, the axis of heavier rainfall shifted south of the Tennessee River. Click here to see a list of some observed rainfall totals from the timeframe listed above the image.


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