textproduct: Omaha/Valley

KEY MESSAGES

- Fog is expected to develop through the overnight hours, with the most widespread fog expected near the NE/IA/MO border region after 3 AM.

- Quiet and pleasant weather Wednesday and Thursday with highs in the low-to-mid 80s.

- Periodic storm chances and warmer temperatures return Friday, with the hottest temperatures reaching the lower 90s by this weekend.

DISCUSSION

Issued at 1045 PM CDT Tue Aug 25 2026

Tonight and Wednesday:

Water vapor imagery this evening continues to show the compact mid/upper low continuing its push into the Great Lakes region while sandwiching a ridge between it and a Pacific Coastal upper low. A cold front is being pulled through the area, scouring out dewpoints with the some values in the 50s trying to sneak into northeast Nebraska. Along/ahead of it, winds have become calm and efficient cooling has already begun to push dewpoints past crossover temperatures with fog being the main concern of the short-term forecast. Those lower dewpoints will continue to move in from the northwest, but the drier advance will take some time to get to the IA/NE/MO border region where fog is expected to be most dense. Already, lower visibilities have been reported across eastern Nebraska and Iowa (KOFK, KFET, KRDK, and KICL) of 5 miles or less, with further deterioration expected through the night. A Dense Fog Advisory will likely be issued for that area with 5-6 AM expected to hold the thickest fog.

As the sun begins stirring the boundary layer and dry air filters in from the northwest, foggy morning conditions will dissipate and shift southeast. Once it does so, mostly clear skies, a ridge of high surface pressure, and continued north-northwesterly winds settle in for the remainder of the day, with highs in low- to-mid 80s on tap for the afternoon. Shower and storm activity won't be too far off, largely being contained along and west of the instability gradient that arcs up from north-central Kansas through western Nebraska. Heading into the overnight hours, we'll be on the lookout for elevated showers and storms that would develop along the convergence on the nose of the low-level jet, but those chances largely look to stay west and south of the forecast area.

Thursday and Beyond:

Thursday heading into the weekend will see a bit of a pattern change, as the long-standing mid/upper ridge to the west erodes and eventually is swept eastward by a trough incoming from the Pacific. Our coolest highs of the forecast are set for Thursday, followed by a warming trend that takes highs into the mid-to-upper 80s Friday, and into the 90s Saturday, Sunday, and Monday. Some of the rain- makers for this period arrive late Friday/early Saturday in a leading shortwave, followed by a frontal boundary that stalls out over the general area late Sunday into Monday. Next week could trend towards increased rainfall, with several of the deterministic models holding southwesterly flow over the Central Plains in anticipation of a deeper trough moving through later in the week. There's still plenty of time for details to come into better focus, but for now, severe storm lovers may have to wait until next week before chances return to the forecast area.

AVIATION /12Z TAFS THROUGH 12Z THURSDAY/

Issued at 546 AM CDT Wed Aug 26 2026

KOFK: VFR conditions prevail at the terminal through the forecast period. Expect a few high level clouds this morning, giving way to clearing skies in the afternoon. Winds remain light out of the northwest through the period.

KOMA/KLNK: IFR to LIFR conditions persist at the start of the TAF period with visibility being reduced by fog/dense fog. Visibility has been bouncing between 1/4 and 4 miles at the terminals. Visibility should begin to improve by 13 or 14Z as the sun comes up and fog starts to dissipate. Once the fog burns off, expect VFR conditions to prevail through the remainder of the period. Winds will remain around 0-10mph.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Dense Fog Advisory until 9 AM CDT this morning for NEZ066>068- 078-088>093. IA...Dense Fog Advisory until 9 AM CDT this morning for IAZ079-080- 090-091.