Da Weekend
Saturday - A tranquil and quiet start to an otherwise
interesting long range forecast this weekend. Upper level ridging
will occur yet again (a little less subtle than today), which should
warm us back into the upper 50's and lower 60's. Dry conditions can
be expected at least through Saturday night and early Sunday.
Winds will likely increase on Sunday as
pressure gradient tightens from a deepening surface low over
Nebraska. Strong warm air advection will occur across the region,
which should push temperatures into the upper 50's east and into the
lower 60's across southeast Kansas. With the strong warm air
advection, some scattered shower activity may be possible by
Sunday afternoon. Going into Sunday night, the low occludes over the
northern plains and the associated surface boundary slides as far
south and east as eastern Kansas before it begins to slow down as it
lines up with the upper level southwesterly flow.
Monday - Tuesday frame rainfall possible
The ECMWF (European Center for
Medium-Range Weather Forecasts ) is certainly more progressive with
the aforementioned system and pushes the frontal boundary through by
late Monday. The GFS (Global Forecast System) is more bullish with
rainfall as it keeps the front back across the Ozarks through the day
Tuesday with a shear axis right over the region. This scenario would
bring numerous rounds of showers and perhaps a thunderstorm or two.
Needless to say, confidence is there that a system will push through
early next week, however, exact details (e.g. true rainfall amounts)
are still somewhat murky.
As for severe weather, given the
aforementioned uncertainties, those chances for now at least are low,
however, not zero. Shear will certainly be there, but as of now the
primary limiting factor is the lackluster instability. We'll need to
monitor this potential through the weekend, especially boundary layer
moisture quality.
Wednesday
Upper low will continue to
wobble around the northern plains into midweek leaving the region
within a dry and seasonably cool southwest flow. Cooler air will
descend into the region on the backside of the system Wednesday
keeping temperatures below normal into next weekend.
Weekend Snow? No way!
Where there is agreement, at least for over
the weekend, is that it does look like some moisture will be thrown
northeastward into our area in a broad area of isentropic lift south
of a surface high pressure over the Midwest and Ohio Valley. A quick look at the
GFS thermal profile for KSGF indicates mostly rain but it`s close to
some wet snow if the freezing level can drop a bit more than prognosticated.
In either case, unless larger scale synoptic guidance takes another
turn/changes (i.e. closer to the ECMWF), we are not
looking at much if any impact right
now. The air mass expected to be in place is not overly cold. Right
now the grids are a mixed bag of rain and snow Sat night into early
Sunday depending on the surface and low level temperatures. Expected precipitation
amounts (qpf) are not all that much, in general just a few hundredths
to around a tenth of an inch over the weekend. www.taneyservices.com
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