Area Forecast Discussion
Issued by NWS Springfield, MO
FXUS63 KSGF 082040
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
240 PM CST Sun Dec 8 2013
.SHORT TERM...(This Evening through Tuesday night)
Issued at 240 PM CST SUN DEC 8 2013
As expected, a rather tricky day across the region. With the area
in and (mainly) out of cloud ice, areas of freezing drizzle
developed around sunrise and persisted for much of today.
Two big issues we are focusing on for this forecast is the
continue potential for freezing drizzle heading into this evening,
black ice potential tonight and another quick shot of light snow
Monday evening into Monday night.
For the rest of today through tonight, weak mid level lift is
departing and low level isentropic charts show neutral to very
weak upglide for a few more hours. As a result, current areas of
drizzle should become more patchy, coming to an end later this
evening. Another concern will be black ice potential. Loss of
solar insolation and temperatures falling back into the upper
teens will promote refreezing of all exposed surfaces. Continued
caution will be required on area roadways tonight into tomorrow`s
rush hour. With the freezing drizzle risk coming decreasing, will
go ahead and let the winter weather advisory expire and issue an
SPS for the expected conditions tonight.
Monday will remain cold and quiet, however yet another round of
wintry precipitation is expected to impact the area beginning
Monday evening. Short range models have been quite consistent the
past few days with bringing a fast moving wave through the region.
Frontogenetical forcing will yield a long/narrow band of snow
that looks to clip southern Missouri beginning early Monday
evening and exiting to the east overnight Monday night. The speed
of this system will limit accumulations to some extent, however
snow to liquid ratios around 15:1 and decent lift should yield a
quick inch or two of snow. Areas along and south of a line from
Pittsburg KS to Bolivar and Rolla in Missouri will experience this
light snow, with the better accumulations along and south of the
Highway 60 corridor. Further forecast refinements are expected,
and with this band expected to be so narrow any minor shifts in
the forecast will greatly affect snow accumulation expectations.
Tuesday and Tuesday night will be cold and quiet as another surge
of cold air enters the region.
.LONG TERM...(Wednesday through Sunday)
Issued at 240 PM CST SUN DEC 8 2013
Northwest flow will begin to flatten somewhat by the end of the
week. Medium range models indicate a cut off low over the
southwestern U.S. will move out into the southern Plains region by
Friday. Temperatures will remain cold with slow moderation through
the end of the week and next weekend.
The next question will be precip types as the upper level low moves
across the Missouri Ozarks. The latest guidance of models indicate
a little more QPF than previous runs with a progressive system
moving through. The GFS was the slightly warmer solution and the
ECMWF and GEM slightly colder.
With this package have leaned more with the ECMWF with a slightly
colder solution. Without being too detailed with precip
type this far out...this forecast update will mention rain and
snow chances for Friday through Saturday. This will be a system to
watch over the next few days. Temperatures will remain below
average especially where snow may still be on the ground.
.AVIATION...(For the 18Z TAFS through 18Z Monday Afternoon)
Issued at 1148 AM CST SUN DEC 8 2013
Numerous hazards to discuss for area aviation interests. IFR
ceilings remain widespread across the area and this will continue
for several more hours. Only exception is at JLN where modest
improvement to low end MVFR ceilings are likely. Areas of drizzle
and scattered light snow showers continue across the region at
this hour. This will result in variable visibility early this
afternoon, ranging from VFR to MVFR for the most part. This
precipitation is expected to end by late this afternoon. After
brief improvement late this afternoon, widespread MVFR
visibility and IFR ceilings are expected this evening through
tonight with gradual improvement Monday morning as a cold front
moves through the area.
MO...WINTER WEATHER ADVISORY until 3 PM CST this afternoon FOR
KS...WINTER WEATHER ADVISORY until 3 PM CST this afternoon FOR KSZ073-