Area Forecast Discussion
Issued by NWS Springfield, MO
FXUS63 KSGF 060842
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
242 AM CST Fri Dec 6 2013
.SHORT TERM...(Today and Saturday)
Round 1 of this winter storm produced an axis of 4 to 6 inches of
snow, roughly along a line from Pineville to Houston Missouri.
Officially here at the Springfield office, we measured 4 inches.
Amounts were much lower in south central Missouri, due to heavy sleet
present. Through midnight, West Plains and Eminence had measured
2 inches, while Alton only had 1 inch of sleet accumulation. Alton
also had about 1/8th of an inch of freezing rain accretion.
Further north, a sharp cut off in accumulation had occurred.
Bolivar only had a dusting, and Pleasant Hope had about an inch.
Therefore, locations north of the Interstate had so far missed out
on the bulk of this winter storm.
Round 2 begins this morning, as an upper level speed max
approaches from the southwest.
The primary precipitation type will be snow for all locations,
since the depth of the arctic air continues to increase. Despite
ratios of around 15:1, a massively dry airmass will cut into
Dew point depressions ranging from 10 to 15 degrees were measured
from Lake of the Ozarks, down to Pittsburg Kansas. This dry air
should really work over accumulation amounts, therefore, we kept a
conservative forecast going through the remainder of this event.
This dry air will have less impact on south central Missouri,
where more snow accumulation is expected today. We now have an
overall storm total accumulation of 6 to 8 inches for areas along
and south of a line from Anderson, to Marshfield, and to Salem. We
very well could see an isolated 9 inch amount somewhere near
Houston or Willow Springs.
For locations along Interstate 44 from Springfield to Rolla,
amounts will range from 4 to 6 inches. Therefore we`re only
expecting another inch or two for the Springfield metro area.
Again that is mainly due to dry air cutting into amounts.
Snow will taper from west to east late this morning and into the
afternoon hours, setting the stage for a bitterly cold night. Look
for overnight lows to fall into the lower single digits. Areas
with heavier snow pack could experience sub zero temperatures
early Saturday morning. A Wind Chill Advisory may be needed for
Saturday morning. I will pass this decision off to the day shift
so they can evaluate the latest guidance with temps and winds.
Saturday will be dry and cold, with highs only warming into the
teens to around 20 degrees.
.LONG TERM...(Sunday through Thursday)
Another round of light snow is possible Sunday. This upper wave
will have much less moisture available, and accumulations could be
on the light side. For now I`ll let the ongoing forecast ride, but
amounts will probably need to be lowered.
Another blast of cold air will spread in Monday night, causing
temperatures to fall below zero in many locations early Tuesday
Dry and chilly weather can be expected through the remainder of
next work week. Fast northwest flow will suppress Gulf moisture
well south of the region.
There may be a pattern change toward the Friday and Saturday
period. Both the GFS and the Euro show a brief period of southwest
flow evolving, along with an approaching wave. This could give us
a quick shot of precipitation toward next weekend.
Otherwise, the extended forecast is looking uneventful at the
.AVIATION...(For the 06Z TAFS through 06Z Friday Night)
Issued at 1128 PM CST THU DEC 5 2013
Light snow will persist for much of tonight at the Springfield and
Branson aerodromes with flight conditions varying between MVFR and
IFR. Joplin will see periods of light snow with flight conditions
dropping into the IFR category with any steadier snow. There may
be a brief lull in snow intensity late tonight before snow
increases again Friday morning. IFR visibilities are expected for
much of Friday morning as the snow increases. The snow will then
taper from west to east Friday afternoon with flight conditions
beginning to improve. There is still an indication that a brief
period of freezing drizzle will be possible as the snow comes to
MO...WINTER STORM WARNING until 6 PM CST this evening FOR MOZ082-083-
WINTER WEATHER ADVISORY until 6 PM CST this evening FOR
KS...WINTER WEATHER ADVISORY until 6 PM CST this evening FOR KSZ073-