NWS Peachtree City, Georgia
4 PM February 24, 2015
Slides:
www.srh.noaa.gov/ffc/html/briefings.php
 Winter Storm Warning: Wednesday 10 AM – Thursday 10 AM
 Franklin -> Peachtree City->McDonough->Madison->Lexington line
 Special Weather Statement for tier of counties south of the Winter Storm
Warning
 Will be a tight gradient or line between snow/no snow
Updates/Trends
 Upgraded Winter Storm Watch to Winter Storm Warning
 Issued Special Weather Statement south of warning area
 Extended warning time through 10AM Thursday
 Mainly to cover lingering impacts on the roadways, most snow
should be ended
 Increased snow amounts
With residual moisture,
could be some patchy
black ice Wednesday
morning
Winds will generally be
light overnight
Roads sensors should go
below freezing around
midnight near Ringgold
to around 3 AM near
Canton to around 6 AM
in Atlanta
 Winter Storm Warning
10 AM Wed – 10 AM Thu
Homer
Lawrenceville
•
Amounts: Widespread 2-6”
expected in the warning area
•
Isolated higher amounts
possible
Carrollton
Lingering effects into Thursday AM
•
Snow is expected to be heavy and
will accumulate quickly due to
the rates.
•
Drive with Extra Caution
•
Snow expected to begin during
daytime hours
 Special Weather
Statement
Wed. and Wed. Night
•
Rain/Snow Mix
•
Minimal accumulations at
best with temperatures in
the upper 30s to lower 40s
•
With uncertainty though,
folks should continue to
monitor the forecast
7 AM Wed
7 PM Wed
Colder air
L
1 PM Wed
Strong wave moving
in from the west
Cold air continues
filtering into the
region
Key is the surface low
developing across the
gulf (staying south of
the area)
Tapping moisture
Atmosphere saturating from the top down
 Indicates drier air filtering in
 Provides room to lower temperatures as precip falls
Tuesday -3PM
Wednesday -9aM
Note the
decrease
across
the area
Precip onset across
the west/south a tad
later
Temps likely steady or
falling if precip starts
early
Snow/precip increasing
in intensity
Temp forecast
confidence is low at
this point
Heavy precip falling.
If snow, would be very
heavy!
Temp forecast low
confidence
Still heavy snow
across the area
Low Confidence
Temp Forecast
Models hinting
at a small/light
band moving
across during
the night
This + Wed snow
help linger
travel impacts
into Thu AM
Rare to see such high
probabilities of > 4”
80-90%
High probabilities of 1” or more of snow
Wed/Thu Snow Forecast (Official)
NAM
GFS
CMC
Winter Storm Warning
• 10 AM Wednesday to 10 AM Thursday
• Widespread 2-6” inches
• Lingering effects into Thursday morning
on roadways
Special Weather Statement – a few counties
south of the warning
Snow will likely impact afternoon commute
Wednesday
Biggest question is where will the southern
extent of the snowfall set up.
Need to monitor forecast as it evolves!
Next Briefing: 9:30 PM
www.srh.noaa.gov/ffc/html/briefings.php