Dense Freezing Fog, Frost, Black Ice &..............."Diamond Dust"

"Dirty High" is trapping low-level moisture.

Posted: Dec 10, 2018 9:46 PM
Updated: Dec 10, 2018 10:21 PM

The storm the Southeast just experienced would be historic in January-February, let alone early December!  Impressive!  Up to 34" of snow has been reported in the higher terrain of North Carolina with near 20" even into the Piedmont of North Carolina. 

It is safe to say that this one of, if not the biggest snowstorm in parts of the Southeast since the biggest one of them all in early December 1886.  That was the biggest December snow on record for the Southeast.

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Areas of dense freezing fog will continue to develop over the viewing area.  Frosty conditions with tree branches covered in glittery rime frost & a heavy frost on all objects will continue to develop, as well.  Black ice will form on roadways, so be careful tonight-tomorrow morning for icy roadways. 

Dense Fog Advisory is up for Benton, Newton & Jasper counties until early morning.

"Diamond dust" is also occurring in the area.  It looks like falling glitter. 

"Dirty High" is trapping all the low level moisture near the surface.  This time of year, the sun angle is low & it is hard to mix out inversions or lids like this.  We are also in a low-solar period, which tends to increase these scenarios.  You find this more in January than early December. 

This "diamond dust" is actually ice crystals that are forming on particulates trapped by the high pressure.  So, dust, smoke & other particulates have crystals growing on them in this 100% humidity.  This diamond dust can put a thin veneer or dusting of "snow" or ice on roadways to only increase the incidence of slick areas.

Lows tonight will remain steady in the teens to lower 20s.

Fog should erode away by 11 a.m., but it may take until noon to early afternoon to really break up the low clouds.

Thus, I cut the high tomorrow from 39 to 37.

Article Comments

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Warm and Dry through Friday.
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