Nebraska City, Nebraska 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

336
FXUS63 KOAX 052311
AFDOAX

Area Forecast Discussion
National Weather Service Omaha/Valley NE
611 PM CDT Fri Sep 5 2025

.KEY MESSAGES...

- Cool and dry conditions will persist through the weekend, with
  highs in the 60s and 70s. Overnight lows are expected in the
  40s, with the upper 30s possible in western Iowa.

- A gradual warming trend is expected early next week, with
  highs in the upper 70s to mid 80s.

- Shower and thunderstorm chances return Monday into Tuesday
  (30-60% chance), with additional low-end (around 25%) chances
  continuing through the rest of the week.

&&

.DISCUSSION...
Issued at 102 PM CDT Fri Sep 5 2025

Today through Sunday...

Water vapor imagery this afternoon depicts an upper-level low
centered over Ontario, with a mid-level jet streak pivoting around
its axis and driving strong zonal to northwesterly flow aloft across
the region. This setup is ushering in cooler air, with highs topping
out in the 60s, roughly 15 below climatological norms, under mostly
partly cloudy skies and breezy northwesterly winds gusting at 20-30
mph.

Surface high pressure will build in over the weekend, maintaining
dry conditions while easing the gusty winds. Highs will continue
below average, generally in the upper 60s to mid 70s. The dry air
mass will also bring a noticeable drop in humidity and allow
overnight lows to dip into the 40s, with the upper 30s possible in
western Iowa.

Monday and Beyond...

By early next week, the upper-level low will shift eastward,
allowing a mid- to upper-level ridge to build into the central
Plains and gradually warm temperatures through the week. At the
surface, high pressure will slide off to the east, with a warm front
lifting north through the area.

Highs are generally expected in the upper 70s to mid 80s, much
closer to seasonal norms. The weak ridge in place will allow several
shortwave disturbances to track across the region, bringing periodic
precipitation chances. The first arrives Sunday night into early
Monday (PoPs 15-30%), followed by a more potent disturbance late
Monday into Tuesday (PoPs 30-60%). Severe weather potential appears
low overall, with long-range guidance bringing modest instability
but limited bulk shear. Still, both GEFS and ECMWF ensemble-based
machine learning guidance highlights a 5-10% probability for severe
weather Monday into Tuesday. We will have to see how the details
shake out as it approaches.

Confidence in the timing and placement of additional precipitation
chances remains low in this extended time frame, with periodic 15-
30% PoPs through the work week. Overall, more dry periods are
expected than wet.

&&

.AVIATION /00Z TAFS THROUGH 00Z SATURDAY/...
Issued at 609 PM CDT Fri Sep 5 2025

A quiet TAF period is in store, as northwesterly winds close to
10 kts continue to slow down underneath shrinking mid-level
cloud coverage near FL070. Speeds overnight are expected to fall
below 5 kts with continued northwesterly winds before increasing
slightly to just below 10 kts tomorrow afternoon out of the same
direction.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.

&&

$$

DISCUSSION...Wood
AVIATION...Petersen