textproduct: Omaha/Valley

KEY MESSAGES

- Dense fog will blanket the area overnight into early Thursday morning. A Dense Fog Advisory has been issued for locations where visibilities could drop as low as 1/4 mile.

- Redevelopment of showers and storms will be possible early Thursday morning, particularly along and south of I-80. - Chances for more storms on Friday, with a 5% chance that some could be strong to severe. Off and on rain chances persist into the weekend and early next week.

DISCUSSION

Issued at 1118 PM CDT Wed Sep 16 2026

Tonight through Friday...

A subtle vort max will continue to lift through the region tonight, as southwesterly midlevel winds pull warm moist air into the region. A few scattered showers will be possible, with the best chance over southeast Nebraska early Thursday morning. Otherwise, the combination of light surface winds and cool temperatures within the moist airmass has yielded more expansive development of fog this evening. Latest RRFS and HREF runs suggest a few locations could see visibilities drop under 1/4 SM, from eastern Nebraska through south central Iowa. Thus, a Dense Fog Advisory has been issued for tonight through Thursday morning.

Visibilities will improve by late Thursday morning as winds pick up and surface temperatures rise. Afternoon highs are currently forecast to reach the low to mid 70s in northeast Nebraska, with low to mid 80s expected over far southeast Nebraska and southwest Iowa.

Another weak shortwave will spill into the forecast area Thursday afternoon, bringing another round of wet weather, this time to northeast Nebraska, Thursday night into Friday morning.

Temperatures will rise into the mid to upper 80s Friday, allowing 1000-2000 J/kg of instability to pool over the region. A cold front will sweep through the region Friday evening, bringing at least a chance for strong to severe storms. Similar to the event we had on Monday, forecast hodographs feature a notable amount of turning in the low levels. However, deep layer shear looks fairly marginal, at around 20-30 kts, with better shear trailing behind the front.

Saturday and Beyond...

By early Saturday morning, the cold front should push off to our southeast. A few more showers and storms will be possible along the front early Saturday morning before it exits the forecast area. Behind the front, most areas reach the low to mid 70s, with a few of our southern counties reaching the low 80s.

Sunday will see a more substantial wave eject from Colorado toward the area. The feature will help trigger or next round for rainfall, particularly across the southern half of the forecast area. Periodic chances for more rainfall continue through Thursday as we see more disturbances traverse the region, but chances remain low at 15 to 30%.

AVIATION /00Z TAFS THROUGH 00Z FRIDAY/

Issued at 608 PM CDT Wed Sep 16 2026

MVFR to IFR conditions will prevail through the majority of the period as fog and low ceilings build into the region. Scattered showers will also be possible early in the period, but should move northeast of KOMA and KOFK by 02Z. Patchy fog will become more widespread and dense after 06Z tonight and remain until 14-18Z, when conditions gradually improve. VFR conditions are expected to return around 20Z Thursday.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Dense Fog Advisory until 10 AM CDT Thursday for NEZ030>033- 042>045-050>053-065>068-078-088>090-092. IA...Dense Fog Advisory until 10 AM CDT Thursday for IAZ056-069-079- 080-090-091.