Area Forecast Discussion
Issued by NWS Springfield, MO
FXUS63 KSGF 311744
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1244 PM CDT Tue Mar 31 2015
Issued at 1110 AM CDT TUE MAR 31 2015
Low level moisture has increased quite a bit this morning across
southern Missouri ahead of a frontal boundary. Late morning
surface dew points had risen into the upper 50s and lower 60s. Low
clouds have also developed across southwest Missouri in response
to the increasing moisture. Meanwhile, a mid/upper level short
wave trough was in the process of moving southeast into
As we head into this afternoon, that front will slowly seep south
across southern Missouri with the approaching wave. Short range
models have been insistent on developing scattered convection
across south-central Missouri from early to mid afternoon. The big
question is how much of a capping inversion will remain in place.
Models are actually increasing the capping strength this afternoon
from west to east across southern Missouri. A look at upstream
RAOBs would support this increase in cap strength. It does appear
that there will still be a window of opportunity along and east of
U.S. 65 and south of I-44 where mid-level temperatures will remain
coolest into this afternoon.
With that being said, MLCAPE values in the 1400-1800 J/kg range
appear quite plausible. 0-6 km bulk shear will be in the 30-35
knot range which will support some updraft organization. We have
therefore included a limited large hail risk (up to the size of
quarters) in the HWO.
Any convection that develops will begin to diminish and shift
south of the area by early this evening.
.SHORT TERM...(Today and Tonight)
Issued at 315 AM CDT TUE MAR 31 2015
A warm day is in store across the Missouri Ozarks and southeastern
Kansas as a weak front drops southward into the area this
afternoon. Southerly winds to start the day and 850 MB
temperatures in the 10 to 13 degree Celsius range will support
highs in the lower and middle 70s.
Moisture will advect northward ahead of the slowly advancing
front. Just enough low level convergence coupled with modest
instability could trigger isolated convection across far southern
Missouri this afternoon.
This activity will diminish with sunset while the front stalls
from northern Oklahoma into northern Arkansas.
.LONG TERM...(Wednesday through Monday)
Issued at 315 AM CDT TUE MAR 31 2015
Another warm day can be expected Wednesday. Southerly winds will
be on the increase as a front takes shape over the plains.
Isolated convection again cannot be ruled beginning as Wednesday
morning and throughout the day as the boundary lifts north as a
The cold front will advance southeastward Wednesday night into
Thursday as an upper level trough digs into the western U.S.
Convection will develop across the Plains into the upper Midwest
Wednesday and Wednesday night along the advancing front then
spread southeastward toward the Ozarks and Osage Plains late
Wednesday night into Thursday morning. It appears that we may
first deal with decaying convection in this time frame. The
question then becomes how far south the front advances Thursday as
a shortwave trough approaches from the west.
Indications are that the front will stall somewhat across the
area with showers and thunderstorms redeveloping Thursday afternoon
into Thursday night. While the extent of surface heating is in
question for Thursday there will likely be sufficient instability given
steepening lapse rates coupled with strong deep layer shear to
support some strong to potentially severe storms Thursday
afternoon into Thursday evening ahead of the front across far
Expect post frontal showers and embedded thunder to continue into
Thursday night before ending Friday morning as the shortwave
trough tracks eastward and front sags southward. Training
convection could result in heavy rainfall totals and a risk for
localized flooding later Thursday.
Much cooler temperatures will follow the frontal passage for
Friday with a gradual warming trend over the weekend. Medium range
models suggest active weather returns early next week.
.AVIATION...(For the 18Z TAFS through 18Z Wednesday Afternoon)
Issued at 1237 PM CDT TUE MAR 31 2015
MVFR ceilings will improve to VFR for most of southern Missouri
this afternoon. A cold front will push into southern Missouri and
is expected to produce scattered thunderstorms over south-central
Missouri. Some of this activity is expected to develop in the
vicinity of the Branson terminal.
Any thunderstorm activity will quickly diminish this evening with
dry weather expected overnight. Some weather models are indicating
returning MVFR conditions (ceilings and visibilities) late tonight
or early Wednesday morning across portions of southern Missouri.
The greatest prospects for this occurring will be around Joplin
Winds will also increase out of the southeast on Wednesday and
will exceed 12 knots at Joplin and Springfield.