958
FXUS63 KDVN 111059
AFDDVN

Area Forecast Discussion
National Weather Service Quad Cities IA IL
559 AM CDT Sat Apr 11 2026

...12z Aviation Update...

.KEY MESSAGES...

- Chances increasing today and tonight for scattered showers and
  maybe an isolated thunderstorm.

- An active pattern is still on track to develop Sunday and
  remain through the end of next week, resulting in several
  chances of showers and thunderstorms through the period.
  Strong to severe storms are possible Monday through Wednesday.
  Warmer temperatures will also be in line through Friday.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 315 AM CDT Sat Apr 11 2026

Today...An increasing warm air advection(WAA) regime day behind
departing ridge complex off to the east. The warming will be more
realized aloft initially and fcst soundings show developing
inversions, especially a well pronounced lower based one at H9 to
H8 MB. Cloud cover also to be on the increase today, initially in
the mid to high layers but then lower stuff trapped under the
inversion. This will also keep a lid on high temperature potential
today with values held down in the 50s. Although upper ridging will
look to build acrs the area today, a ridge-riding vort max will
combine with the WAA to produce increasing elevated showers acrs the
area as the day progresses and lasting into tonight. The coverage
sctrd in nature and higher on the IA side, but getting into
northwest IL by this evening as well. Some marginal mid layer lapse
rates and MUCAPEs of 400-800 J/kg to support some thunder acrs the
northwestern DVN CWA, but better storm support appears to be west
and north from west of the DSM area up through north central WI.
Some of the stronger elevated cells may be able to produce some
hail. Rainfall amounts look to be a quarter inch or less by late
tonight.

Tonight...Fcst soundings and profilers suggest a southwesterly LLJ
to really crank up tonight to 45-55 KTs, and the convergent axis
shifts acrs eastern MN into WI where an elevated type MCS may occur
tonight. A few lingering elevated showers will continue locally
overnight, with southerly sfc winds of 10-20 MPH producing a steady
to slow rise non-diurnal temp trend into Sunday morning.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
Issued at 315 AM CDT Sat Apr 11 2026

Sunday...A few isolated showers may skirt by quickly in the fast
flow in the morning, with a more optimum warm moist conveyor occurring
by afternoon to shuttle more showers and thunderstorms up acrs the
area for afternoon and well into the evening. If the showers/storms
can get sfc rooted, there may be a chance for a few storms to
produce gusty winds in robust low to mid level wind fields. If the
BL WAA can boost temps into the low to mid 70s with sfc DPTs in the
low 60s, enough sfc based CAPE could be there for the wind cause.
Showers and storms will fester into Sunday night, with localized
swaths of rainfall ranging from 0.25 to 0.75 by Monday morning.
Away from the storms, mixing profiles suggest ambient sfc wind gusts
of 35 to 40 MPH.

Monday through Friday...Latest ensemble trends continue to show a
rather deep southwest CONUS upper trof establishing and resulting in
a troublesome arching southwesterly steering flow aimed right up
acrs the central to upper MS RVR Valley. There will be a chance for
warm sector storms on Monday, but another round of solutions
suggesting the upper ridging to re-amplify and nudge it`s way right
up acrs the CWA with LLVL cyclogenesis more toward the northern
plains and west-to-east oriented sfc boundary laying out more to the
north acrs southern MN into WI. This is where the Monday night MCS
action zone/convective spawning grounds may occur.  The local area
may get impacted by an EML cap, but still some chance for a portion
of the convective system just to the north to bleed down into the
norther CWA and be a threat later Monday night into Tue morning.
Will have to assess further model runs and trends of course for the
rest of the week, but this may be a scenario where we have to take
it day by day as convective evolution will depend on what occurs the
previous day and night, with lingering boundary and outflow into the
following day affecting the next round of convective initiation.
This as pieces of the upstream trof eject out in the mid CONUS
southwesterlies and up acrs the Midwest, utilizing bouts of warm
moist conveyor up off the western Gulf for much of next week. Some
rounds of warm days in this stretch as well, with 80s looking likley
for the breezy warm days of Monday and Tuesday, with solid 70s for
much of the rest of the week.

&&

.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/...
Issued at 550 AM CDT Sat Apr 11 2026

VFR conditions hanging on for awhile through late morning with
increasing mid and high clouds from the southwest as return
flow aloft takes hold behind departing high pressure. Light and
variable winds early will trend to southeasterly 5-10 MPH by
late morning. Cloud cover will continue to increase and try to
saturate down to MVFR levels as the day progresses, but it might
take until later this afternoon to do so. Sctrd to isolated
high based showers will increase and spread acrs the area mainly
this afternoon, with a chance for them to produce passing bouts
of MVFR if they manage to cross over a TAF site. A low chance
for an isolated thunderstorm at DBQ and CID this afternoon and
evening. Later during the evening, south to southeasterly sfc
winds will continue to increase to 10-15 KTs, and southerly flow
at 2K FT AGL may approach 40 to 45 KTs making for marginal LLVL
wind shear into early Sunday morning.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...None.
IL...None.
MO...None.

&&

$$

SHORT TERM...12
LONG TERM...12
AVIATION...12

NWS DVN Office Area Forecast Discussion