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Welcome to the Multimedia Impact Weather Briefing for Central Alabama. Today is
Saturday, December 21, 2013. I am Meteorologist Jody Aaron and I will guide you
through the presentation today. This briefing will focus severe thunderstorm
development Tonight into Sunday. Due to the holidays and numerous travel plans
that are starting this weekend, please stay abreast of the latest developments as
this storm system will affect travel across a large part of the eastern United
States. The well-advertised, dynamic storm system looks right on track and
confidence is increasing that severe thunderstorms will develop across Central
Alabama.
As we head into Saturday evening from 8 pm to midnight, an organized line
of thunderstorms should develop just ahead of a pre-frontal trough in Mississippi.
This activity will approach west central Alabama. A few storms are even possible
just ahead of the developing line. Due to the moisture, instability, lift and
shear, some storms may become severe with damaging winds and tornadoes. The red
highlighted area will have the greatest chance of experiencing severe storms as
the threat area move west to east and crosses into Central Alabama.
The midnight to 4 am time frame will be fairly active. The organized line of
storms will move into west Central Alabama. Once again, a few storms are even
possible just ahead of the developing line. Severe storms accompanied by
damaging winds and tornadoes are possible, especially in the red highlighted
area.
During the 4 am to 8 am time frame, the line will slow down right across central
Alabama. As the main storm system lifts out to the northeast, some of the severe
ingredients will weaken slightly. But we still think there will be a risk of
severe weather including tornadoes in the red highlighted area.
From 8 am to Noon, confidence has improved some and we will include a risk for
severe thunderstorms across the southeast. The main squall line will be exiting
so the threat may end quicker than slower. What instability we still have will
continue to weaken.
After Noon Sunday through Monday morning, the main dynamics will have exited but
the tail end of the system will remain across Central Alabama, particularly the
southeast. There will be plenty of lift around still that will help in the
development of showers and storms. We will need to watch for any training or
redevelopment over areas throughout this period as this may result in isolated
flooding.
The main threat associated with this system will be damaging straight line winds.
But there will be a chance of tornadoes, especially if isolated cells develop
ahead of the main line or if breaks develop in the convective line. The large
hail and flooding threats appear smaller but have slightly increased from previous
forecast.
Here are some safety rules and definitions to remember. I'll give you a few seconds
to read these notes. Please start reviewing your safety plans now and make any
appropriate changes before the weather starts. There is a good possibility of a
watch being issued Tonight. If a warning becomes necessary, enact your safety
plan and take shelter immediately.
Thank you for watching this presentation today. For rapidly changing situations,
please see the our graphicast, advertised on the front our website for the latest
pertinent information. If you have any additional questions, please give us a call
at 205-664-3010.