Special Weather Statement, NWS Wichita, KS

Area Forecast Discussion
National Weather Service Wichita KS
305 PM CDT Sat Apr 29 2017

.SHORT TERM...(This evening through Tuesday night)
Issued at 304 PM CDT Sat Apr 29 2017

Main forecast focus is the ongoing storm system.

Showers and thunderstorms continue across the eastern portion of
the CWA. Ongoing convection remains below severe levels. Would
argue that some of these could be strong with the shear/buoyancy
combinations, but the most significant threat is well to the east
of the area.

The main focusing mechanism for the convection across southeast
Kansas is an inverted trough which extends north of a low which
was centered over eastern Oklahoma. Satellite/radar/observations
show a back edge to the main area of convection which extended
from about OKC-ICT-MCI. This should continue moving east as the
system.

One thing of note was that on the back side of this trough, there
was a small mesoscale area of northeast winds gusting over 40
knots. This was noted on the WSR-88D where winds exceeding 50
knots were observed. This was very localized and at the moment and
is not seen in the observations.

Well behind this area of precipitation, a second area of forcing
and associated precipitation extends across western Kansas. Much
of this is snow with significant accumulations. This forcing is
associated with the main PV anomaly which is well back across the
4 corners region.

This is significant since the main forcing does not move across
the state until late tonight through morning Sunday. This means
that there remains very high confidence in significant
precipitation across the state through Sunday. Of note here this
the forcing depicted with this storm is one of the more prolific
Q-vector convergence signals that I have seen.

As the storm exits, enough cold air will be brought into the CWA
for snow to fall in central Kansas. This should accumulate along
and north of a line from Salina to Great Bend. Accumulations right
now are expected to be an inch or less.

The flood watch looks in good shape. Have received reports of over
2 inches or rainfall across the southern and eastern portion of
the CWA. Many ditches are running full but no flooding has been
reported. We expected an additional 2-3 inches of rain through the
remainder of the storm, so flooding is still possible, and likely
along the rivers in that part of the state.

Storm Bottom line: very high confidence in additional
precipitation, fairly high confidence in snow across central
Kansas with an inch or less of accumulation. Good confidence in
receiving anorth 2-3 inches across southeast Kansas. Storm should
exit the region Sunday night.

The next problems to deal with are the wind and low temperatures
Sunday night. Strong cold advection behind the front will push
temperature down toward freezing Sunday night across central
Kansas. Will have to monitor, but no frost expected with the
amount of wind expected. Soundings suggest enough momentum
transport for wind advisories Sunday afternoon and evening across
central Kansas.

.LONG TERM...(Wednesday through Saturday)
Issued at 304 PM CDT Sat Apr 29 2017

The main challenge here is the system moving through the region
Wednesday. The ECMWF/GFS runs today trend further south and east
with the precipitation. And while that storm system does take a
similar track, the associated upper level disturbance is not
nearly is vigorous. This means less forcing and less
precipitation. Confidence is moderate at receiving additional
precipitation, higher for southeast Kansas. Severe storms do not
look probable at this time.

&&

.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1251 PM CDT Sat Apr 29 2017

Messy/complicated aviation forecast with multiple flight impacts.
Fairly widespread IFR conditions are expected until upper low
departs. This is mainly due to ceilings, with visibilities
dropping to 1-2mi in heavier precipitation. Anticipate LIFR
ceilings in deformation band on the trailing edge of the low with
slow improvement on Sunday. Colder air and steep lapse rates will
result in a rain/snow mix at KRSL/KGBD around daybreak. -Howerton

&&

.PRELIMINARY POINT TEMPS/POPS...
Wichita-KICT    49  41  47  39 / 100  80  50  30
Hutchinson      46  38  44  37 / 100  80  60  40
Newton          47  40  45  37 / 100  80  60  40
ElDorado        51  43  49  38 / 100  70  50  40
Winfield-KWLD   53  43  50  39 / 100  70  50  20
Russell         42  35  38  34 /  90  90  80  50
Great Bend      42  35  39  35 /  90  90  80  40
Salina          46  38  45  37 / 100  80  70  50
McPherson       45  38  44  37 / 100  80  70  50
Coffeyville     58  49  55  41 / 100  80  40  20
Chanute         55  48  55  40 / 100  90  50  30
Iola            53  48  55  40 / 100  90  50  30
Parsons-KPPF    58  49  55  41 / 100  80  40  20

&&

.ICT WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through Sunday morning for KSZ096-098>100.

&&

SHORT TERM...KRC
LONG TERM...KRC
AVIATION...PJH
HYDROLOGY...KRC

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Special Weather Statement
National Weather Service Wichita KS
314 PM CDT SAT APR 29 2017

KSZ093-292045-
Cowley KS-
314 PM CDT SAT APR 29 2017

The National Weather Service in Wichita has issued a

* Significant Weather Advisory for...
  Central Cowley County in south central Kansas...

* Until 345 PM CDT

* At 312 PM CDT...National Weather Service meteorologists were
  tracking a strong thunderstorm 8 miles southwest of Dexter, or 11
  miles east of Arkansas City...moving northeast at 65 mph.

hail up to the size of nickels will be possible with this storm.

* Locations impacted include...
  Arkansas City, Winfield, Burden, Dexter, Atlanta, Cambridge,
  Winfield City Lake and Maple City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be prepared to take shelter in the event the storms intensify and
become severe...or a warning is issues by the National Weather
Service.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3747 9689 3748 9659 3748 9653 3705 9672
      3705 9701
TIME...MOT...LOC 2013Z 203DEG 58KT 3713 9685

LAWSON