textproduct: Omaha/Valley

KEY MESSAGES

- 40-70% chance for storms after 8 PM across northeast Nebraska. Storms could be severe with large hail, damaging winds, and a small risk for a tornado.

- Hot and humid weather with heat index values in the low 100s across southeast Nebraska. A heat advisory is in effect for Wednesday through at least Thursday. - Hot and humid weather continues across the region into the weekend along with some small chances for nightly storms. Warm lows in the 70s will provide little relief.

DISCUSSION

Issued at 1249 PM CDT Tue Sep 1 2026

A hot and humid day is ahead of us, one of many for the foreseeable. Looking at water vapor imagery, a shortwave trough over the central Rockies is beginning to approach the region. At the surface, a quasi-stationary boundary is noted near the Nebraska and South Dakota border. The remainder of this afternoon we can expect to see mostly sunny skies as temperatures climb well into the 90s with dewpoints in the 60s and 70s. Widespread heat index values in the upper 90s and low 100s will be a concern for the area.

As the aforementioned trough moves closer to the area this evening, storms are expected to develop over portions of north- central Nebraska and south-central South Dakota. A belt of enhanced mid-level winds will result in sufficient wind shear for strong to severe storms. Large hail, damaging winds, and a low chance of a tornado will all be possible. These storms are forecast to follow along the quasi-stationary boundary towards our area late this evening. As these storms approach, a gradual evolution into a complex of storms is anticipated. These storms are expected to move across portions of northeast Nebraska after 8 PM, before exiting shortly after midnight. With the complex of storms, damaging winds is the primary hazard, but large hail and an isolated tornado remains possible. Showers and storms may linger into early Wednesday morning, but these should not pose a severe weather threat. With cloud cover over much of the area and south winds, expect temperatures to struggle to cool into the 70s.

The heat slowly worsens on Wednesday. Temperatures are forecast to climb into the mid to upper 90s across most of the area. Across east-central and southeast Nebraska, the combination of limited relief from the heat at night, and afternoon heat index values in the low 100s is leading to cumulative heat stress. A Heat Advisory has been issued for these locations as a result of this. The Heat Advisory runs into Thursday with similar temperatures to Wednesday expected. The streak of overnight low temperatures well into the 70s and high temperatures well into the 90s closes out the week. With the heat not subsiding, an extension or expansion of the Heat Advisory is possible. Outside of the heat, there will continue to be a low chance (10-30%) of showers and thunderstorms most nights, but this remains largely confined to northeast Nebraska.

The heat continues into the weekend, but eases slightly. The worst of the heat could linger into Saturday, but Sunday onward sees a slow, but steady decrease in temperatures each day. Highs back in the 80s may be something to look forward to by Monday next week. Continued nightly showers and thunderstorm chances remain during this time. Above-normal temperatures hold into next week as the large-scale weather pattern remains stagnant.

AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/

Issued at 1152 AM CDT Tue Sep 1 2026

VFR conditions are expected to prevail through the TAF period. Southeast winds at OFK and south winds at OMA and LNK last through much of the period. A complex of showers and thunderstorms is forecast to move through northeast Nebraska between approximately 02 to 08Z. The majority of model guidance keeps this activity north of area terminals. There remains a low chance of thunderstorms at OFK during this period, but uncertainty is high on this scenario. A brief wind shift towards the northwest is likely at OFK as any showers or thunderstorms move through northeast Nebraska. There is a low chance of LLWS conditions across much of the region overnight, but forecast conditions should remain below LLWS thresholds.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Heat Advisory from 1 PM Wednesday to 7 PM CDT Thursday for NEZ051>053-066>068-089>093. IA...Heat Advisory from 1 PM Wednesday to 7 PM CDT Thursday for IAZ069-079-080-090-091.