Area Forecast Discussion
Issued by NWS Springfield, MO

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FXUS63 KSGF 190003 AAA

703 PM CDT Sat Apr 18 2015

...Update to Aviation Section...

Issued at 703 PM CDT SAT APR 18 2015

Forecast will be updated shortly to account for short term trends
from satellite/radar as well as to account for expected convective
trends heading into the overnight hours.

Over the past few hours, we have seen clearing across western
portions of the area. This clearing will likely be short lived as
mid/high level clouds increase from the west from convective
exhaust. That said, this area did see a soaking rain this morning
and dewpoints remain relatively high compared to expected lows. As
a result, will include a mention of patchy fog and keep an eye on
localized dense fog potential in places where skies can remain
clear for a longer period of time.

In addition, PoPs have been updated for the next 12 or so hours.
The western half of the area will likely see little in the way of
rain chances this evening. Chances over the eastern half look to
remain in the solid chance range giving on again/off again showers
and isolated thunder. HRRR and other short range models continue
to indicate rain chances increasing across south central Missouri
and the eastern Ozarks from late this evening into the overnight
hours. In addition, remnant convection from KS/OK complexes will
enter from the west, with rain chances steadily increasing
across extreme southeastern Kansas and western Missouri.
Interestingly, the Highway 65 corridor will likely be between
these two areas of activity and PoPs are lowest in this area for

Taking a peak at tomorrow`s severe weather potential. There
remains some question as to just how much instability we will be
able to generate as decaying convection continues to spread in
from the west during the morning hours. The main upper trough will
not arrive until later in the day, bringing and increase in deep
layer shear. However, models struggle to bring much more that
500-1000 J/kg of most unstable CAPE into the southern half of the
area. By far the better chances for severe convection will be to
our south and southeast. Obviously this is close enough to keep a
close eye on trends and we will see what the 00z suite of models
have in store for the area.


.SHORT TERM...(This Evening through Sunday Night)
Issued at 315 PM CDT SAT APR 18 2015

The coverage of showers and thunderstorms continued to decrease into
the afternoon. However a band of scattered showers and storms persisted
along a 925-850 MB convergence axis that stretched north to south
east of the Highway 65 corridor and in advance of a mid level vorticity
lobe lifting northeast across the area. Expect convection through
early evening to be focused along and ahead of these features
across south central Missouri. This 925-850 MB convergence axis
may become the focus for additional development later tonight
across the eastern Ozarks as another vorticity lobe lifts
northeast toward southeastern Missouri. Coverage of precipitation
will remain more isolated elsewhere much of tonight. However there
may be increase in convection from the west into southeastern
Kansas into far southwest late tonight as convection across the
Plains shifts eastward.

The closed upper level low now over eastern Colorado will open up
and track eastward toward Missouri on Sunday. Expect the coverage
of convection to increase Sunday as synoptic scale lift increases
with the aide of an increasingly diffluent upper flow and the
approach of vorticity maxima.

Deep layer shear will increase Sunday as the mid level flow
strengthens and lapse rates steepen as temperatures aloft cool in
response to the approaching upper level trough.

The question is the extent of instability that will develop. The
potential for ongoing convection and cloud cover may limit surface
heating and resulting instability. However if sufficient
instability can be realized then ingredients would be in place for
at least a few severe storms.

At this time the greatest potential for strong to severe storms
will be across far southern Missouri or generally along and south
of Interstate 44. The risk for severe weather could decrease or
increase depending on the amount of destabilization. The primary
risks with any severe storms that can develop would damaging winds
and large hail.

With some areas already receiving moderate to heavy rainfall the
past couple of days...the risk for localized flooding will have to
be monitored particularly across far southwestern Missouri.

Showers and some thunder will linger into Sunday night as the
upper level trough and associated cold front track across the

.LONG TERM...(Monday through Saturday)
Issued at 315 PM CDT SAT APR 18 2015

Much cooler weather will prevail heading into early next week as
an upper level trough digs into the Great Lakes and maintains a
northwesterly flow aloft across the region. This cooler weather
will persist most of next week. Weather conditions could also be
rather unsettled as disturbances slide southeastward around the
periphery of the upper trough. This will bring intervals clouds and
the possibility of showers and thunderstorms at times mid through
late week. However this activity is expected to be spotty in

Temperatures could fall into the upper 30s Monday night. Frost is
not expected at this time but this potential should be monitored.


.AVIATION...(For the 00Z TAFS through 00Z Sunday Evening)
Issued at 703 PM CDT SAT APR 18 2015

Partial clearing, light winds and most grounds from earlier today
will bring a risk of fog to the area late this evening into the
overnight hours. At this time, have inserted MVFR fog at all
sites, however there is a chance for IFR (possibly lower)
conditions at BBG and SGF if skies can remain clear long enough
into the overnight hours. Better rain chances this evening will be
well to the west and just to the east of the aerodromes. Rain
chances will increase overnight at JLN as a decaying complex of
showers/storms approaches from KS/OK. This activity will spread
eastward into the SGF/BBG aerodromes during the daylight hours of
Sunday morning, with redevelopment of showers/storms possible at
all sites Sunday afternoon before exiting Sunday evening.




LONG TERM...Foster
AVIATION...Gagan is the U.S. government's official web portal to all federal, state and local government web resources and services.