Romeoville, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

269
FXUS63 KDVN 021957
AFDDVN

Area Forecast Discussion
National Weather Service Quad Cities IA IL
257 PM CDT Wed Apr 2 2025

.KEY MESSAGES...

- Isolated thunderstorm development is probable (20-30 percent
  confidence) this afternoon over eastern Iowa that may have a
  severe threat.

- Wind Advisory for this afternoon for much of the area due to
  occasional gusts of 45 to 50 mph.

- Outside of today, temperatures look to be near or slightly
  below normal for early April.

- A somewhat active weather pattern continues late this week
  with two additional but weaker systems moving through the
  Midwest.

&&

.SHORT TERM /THROUGH THURSDAY/...
Issued at 250 PM CDT Wed Apr 2 2025

This afternoon: Severe threat continues to wane as the better
moist axis has shifted into IL to the lower MS Valley. SPC has
only a Slight Risk in Putnam county with the Marginal in far
eastern IA into western and northwest IL. Deep shear is still
evident in our forecast area but the cold front/dry punch is
quickly moving into our western counties. CAM`s suggest isolated
thunderstorms developing in eastern IA moving quickly out of our
area by 6 pm. Dry air is starting to win out so we could easily
end up dry this afternoon. With the deep low (989 mb) in north-
central IA lifting into western WI strong southwest winds will
be gusting to 45 to 50 mph through early this evening, then
diminishing. The wind advisory continues across much of the
forecast area (except nw IL) until 7 pm.

Tonight through Thursday: Dry and cooler with lows in the mid
30s nw to the lower 40s se. Highs on Thursday in the mid 50s to
around 60.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
Issued at 250 PM CDT Wed Apr 2 2025

Friday through Sunday: Deep trough in the Plains states will
remain anchored this weekend, with a southwest flow and deep
moisture from the lower MS Valley to the Ohio Valley. This is
where tremendous rains and severe weather will occur. A wave
moving in this flow may spread rain into our forecast area
mainly Friday and Friday night. Potentially around an inch of
rain may occur in our southern counties, with much less rain
amounts to the north. Near normal temperatures for early April
are expected with highs in the 50s.

Sunday night and Monday: Global models similar in diving a
vigorous trough into the upper Midwest/Great Lakes with a band
of snow showers pushing into portions of the forecast area on
Monday. The GFS is much more aggressive with these snow showers
than the ECMWF. Time will tell. Colder with lows in the mid 20s
to lower 30s and highs in the 40s.

Tuesday through Wednesday: Should be dry with temperatures
rebounding into the lower 50s on Tuesday, then into the 60s on
Wednesday.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 1243 PM CDT Wed Apr 2 2025

Complicated weather pattern with clouds and storms at the TAF
locations for this period.

Latest 15Z SFC analysis has low pressure across western Iowa
with boundary to the west of TAF locations. A warm front was
southeast of area. Latest 1706Z Satellite has clearing area
almost to TAF locations. Latest 1700Z KDVN radar has some
showers and thunderstorms near KBRL to KMLI and east rapidly
moving northeast.

Expect some decrease in clouds to develop at TAF locations
over the next few hours. As front approaches from the West
expect widely scattered to scattered showers and thunderstorms
to develop for a few hours. Have placed Prob30s for a few hours
in TAFs to account for this activity. Otherwise expect a mix of
clouds for the remainder of the TAF period. Southerly winds will
switch to the southwest and west. Strong winds gusting to 30 to
40kts is possible during the early part of TAF period with
some decreasing in winds during the remainder of the period.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...Wind Advisory until 7 PM CDT this evening for IAZ040>042-
     051>054-063>068-076>078-087>089-098-099.
IL...Wind Advisory until 7 PM CDT this evening for ILZ015>018-
     024>026-034-035.
MO...Wind Advisory until 7 PM CDT this evening for MOZ009-010.

&&

$$

SHORT TERM...Haase
LONG TERM...Haase
AVIATION...Holicky