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The December 19th, 2000 Winter Storm

Bryan P. McAvoy
NOAA/National Weather Service
Greer, SC

Author's Note: The following report has not been subjected to the scientific peer review process.

The map below shows snowfall totals reported from the 19 December 2000
winter storm for WFO Greenville-Spartanburg's County Warning Area (CWA).
Amounts of four inches or more meet winter storm criteria, and are 
lightly shaded.  The map represents snowfall amounts as they were reported 
to the office during the event, and may not represent storm total 
accumulations, though they should be close.
Snowfall accumulation from the 19 December 2000 winter storm
Figure 1.  Total snow accumulation (inches) for the 19 December 2000 winter 
storm.  Click on image to enlarge.
A winter weather advisory was issued for the entire Greenville-Spartanburg 
CWA during the 4 AM EST forecast package on 19 December.  However, advisory
criteria or better were only reached in the northwestern half of the CWA 
and in a small part of Davie County, North Carolina.  Areas further south 
and east had only rain for most of the event, with only some light snow that 
evening.  The advisory was upgraded to a winter storm warning around 530 AM 
EST on the 19th for parts of the mountains of northeast Georgia, South 
Carolina and southern North Carolina after reports of snowfall amounts 
exceeding four inches started coming in from northeast Georgia.  In these 
areas, two narrow bands of heavy snow developed during the early morning 
hours.  As the second band slowly moved east into the Upstate, it rapidly 
dissipated by 8 AM EST, making it no further east than western Spartanburg
County.
The image below is a model sounding valid at noon local time on the 19th for
Charlotte, one of the locations in the advisory which received almost no
measurable snowfall.  The red line is a temperature trace.  Notice how the 
red trace starts right at zero degrees Celsius and stays there up through 
about the lowest 4000 feet.  In actuality, the surface temperature was 
warmer (see the surface map below) than the sounding indicated.
Snowfall accumulation from the 19 December 2000 winter storm
Figure 2.  Eta forecast sounding from the 0000 UTC 19 December run of the
Eta model valid at 1700 UTC on 19 December.  Click on image to enlarge.
The map below was valid at 1 pm local time on the 19th.  The observation 
near the center of the map, with the designator KCLT, is that from 
Charlotte Douglas International Airport.  This is one hour later than the 
model sounding above (the temperature/dewpoint was the same the previous 
hour).  The temperature at Charlotte verified a little over 2 degrees 
Celsius warmer than what the model projected.  It is interesting to note 
that the model depicted above, the 0000 UTC 19 December run of the Eta
model, generated 0.28 inches of rain at Charlotte during the late morning 
and early afternoon.  In reality, only 0.10 inches of rain fell during 
this time.  It is quite possible that the lighter than expected 
precipitation rates resulted in a warmer than anticipated layer in the 
lower atmosphere, leading to mostly rain in the North Carolina Piedmont 
and the eastern part of Upstate South Carolina.  These model errors 
apparently were exacerbated further east in the Carolinas.  As these
locations are outside of our forecast area, they were not investigated.
Surface analysis at 1800 UTC 19 December 2000
Figure 3.  Surface front and pressure analysis at 1800 UTC on 19 December.


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Page last modified: August 26, 2011

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