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NorthGeorgiaWX

January 20, Sunday

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I'll keep this short and sweet this morning. Stay warm today, it's going to be blustery and for most, the high temperature has already been reached. Consider this the kickoff for winter. 

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Want some good news? 🙂 

 

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Maybe some flurries flying out there very early today. I've seen a few here in Gwinnett this morning and there could be some heavier flurries in some spots as the cold wrings out the moisture.

 

20190120_0919_kffc_BR_0.5-19.png

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Short Term Outlook

Quote

Precip axis as exited the region with wrap around conditions now
in full force featuring low clouds, rapidly falling temps and

windy conditions. Some mid 30s already moving into NW sections of
the forecast area and near freezing not far behind over portions
of North Alabama. Other development has been the winds with gusts
over 20 knots common and leading to wind chills in the mid 20s.
Will see how temperatures go the next few hours across far NW but
may need SPS for black ice although winds should be helping
greatly in drying roads out.

For today, precip over Tennessee will rotate eastward and question
is if any of this activity will make it into the northern
sections. HRRR not showing much potential for snow showers while

NamNest is a bit more aggressive. Have shown QPF only for the
higher peaks of the north central mountains and a brief period of
snow showers resulting in a dusting or less looks to be the best
bet at the moment.


Winds will continue to increase through today with gusts in excess
of 30 knots becoming quite common. Wind advisory looks on target
for now and no changes planned but will need to monitor for
possible extension past current 00Z expiration time.

Will be quite cold into Monday morning with mid teens over the NE
mountains and lower 20s across the Atlanta metro. Some of the
guidance is indicating even lower values with upper teens for
Atlanta but given winds remaining elevated, will lean toward the
higher side of guidance.

 

 

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13 minutes ago, NorthGeorgiaWX said:

Gravity waves

GOES13372019020e3REFw-20.jpg.d490f53d96db020dd05475b0fe550f25.jpg

I’m sure why this happens but can I get a bit of an explanation. Just curious. 🙂

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23 minutes ago, Jeff9702 said:

I’m sure why this happens but can I get a bit of an explanation. Just curious. 🙂

Quote

Drop a stone into a pool of water. The spreading ripples are gravity waves. The waves occur between any stable layers of fluids of different density. When the fluid boundary is disturbed, buoyancy forces try to restore the equilibrium. The fluid returns to its original shape, overshoots and oscillations then set in which propagate as waves. Gravity or buoyancy is the restoring force hence the term - gravity waves.

These waves (internal gravity or buoyancy waves) abound in the stable density layering of the upper atmosphere. Their effects are visibly manifest in the curls of the stratosphere’s nacreous clouds, in the moving skein-like and billow patterns of the mesosphere’s noctilucent clouds and in the slowly shifting bands of the thermosphere’s airglow.

What triggers them? The ‘stones into the pond’ are disturbances far below in the troposphere, for example, wind flow over mountain ranges and violent thunderstorms. Jet stream shear and solar radiation are other sources. An initial small amplitude at the tropopause increases with height until the waves break in the mesosphere and lower thermosphere. Their wavelengths can range up to thousands of kilometres. Their periods range from a few minutes to days.

They do more than give clouds interesting shapes. They are vital in their role of transferring energy, momentum and chemical species between the different atmospheric layers and in the subsequent influence on upper atmosphere winds, turbulence, temperature and chemistry.

https://www.atoptics.co.uk/highsky/hgrav.htm

http://www.planetary.org/blogs/guest-blogs/2016/atmospheric-waves-awareness.html

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5 hours ago, NorthGeorgiaWX said:

Maybe some flurries flying out there very early today. I've seen a few here in Gwinnett this morning and there could be some heavier flurries in some spots as the cold wrings out the moisture.

 

20190120_0919_kffc_BR_0.5-19.png

We've had a few flurries on and off here and Acworth this morning. It actually doesn't feel as bitterly cold as I was expecting. This wind is pretty brutal, however.

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1 hour ago, AlKhamsa said:

We've had a few flurries on and off here and Acworth this morning. It actually doesn't feel as bitterly cold as I was expecting. This wind is pretty brutal, however.

Yes, these temps are the first step down, colder coming later this upcoming end of week and weekend.

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