textproduct: Omaha/Valley

KEY MESSAGES

- Off and on chances for showers and storms continue through mid-week, with Tuesday evening holding the best chances for damaging storms to affect the area.

- Hot temperatures in the 90s, heat index values of 100+ degrees, and limited relief overnight will only further settle in through the week.

DISCUSSION

Issued at 1046 PM CDT Sun Aug 30 2026

Tonight and Monday:

Water vapor imagery this evening features a neagtively-tilting mid/upper low over the Alberta/Saskatchewan border region, with a belt ascent stretching from the Four Corners Region through the Dakotas ahead of it, triggering a line of convection heading towards Minnesota. Focusing on the local area, sticky dewpoint temperatures persist within a reservoir of high theta-e values stretching from north-central Kansas into Minnesota, with a few shortwaves over the Front Range poised to push northeast along it.

Shower and storm chances continue to be one of the focuses of the short-term forecast, with the aforementioned shortwave being the forcing for initiation of a cluster of storms that will move through the southeasterly flow through eastern Nebraska early Monday morning. This cluster will be at the intersection of strong low- level winds directly to its southeast, while more languid conditions remain in place north of that. If this cluster decays and increases the downward momentum along the northern edge of the stronger winds, we could see a swath of gusty winds of 40-50 mph near Interstate 80 between 6 and 8 AM, but latest runs of the CAMs have backed off a bit from this idea; both in coverage and in intensity. Other than those winds, decaying showers in the form of light rain will waft through and give another cloudy start to Monday, with highs once again set to push back into the upper 80s to low 90s. Similar stickiness will remain as well, with the max heat indices set to top 100 degrees once again across southeast Nebraska and into Iowa.

Another corridor of moisture will be laid across the area with modest flow aloft to make for some limited severe weather risk (1 out of 5), with model soundings indicating that elevated storms will wait before igniting along the nose of the LLJ early Tuesday around 2 AM. We could see a few hail stones and a gust or two to 60 mph to fulfill that outlook, but chances don't look great (about 5%).

Tuesday and Beyond:

Once day breaks Tuesday morning, lingering shower and storm activity will remain across northeast Nebraska into northwest Iowa through much of the morning before being shunted northward by overspreading southerly flow. Surface boundaries across west-central Nebraska will be the focus of late afternoon and evening storm chances that drift into eastern Nebraska after 7 PM, with modest mid/upper flow and some low-level curvature in the hodograph contributing to clustered storms and supercells that would be more likely to produce damaging winds, hail, or even a tornado or two compared to the two previous nights' chances. Another hot day is on tap as well, with southeast Nebraska and southwest Iowa once again being the hottest due to more prolonged sunlight.

Heat continues to be the main concern of the extended forecast as the mid/upper pattern sees the shortwaves and larger upper low that sparked rain chances early in the forecast translate northeast, leaving the central CONUS in the hands of retrograding ridging that will only slowly erode during the early half of next week. Highs will remain 10+ degrees above normal for most of the area, with overnight lows that may not fall below 75 degrees after Tuesday through the rest of the week. If the forecast doesn't trend cooler, we'll likely be issuing multi-day Heat Advisories for Wednesday onward, which will be poorly timed with the return of school-related outdoor activities.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1216 AM CDT Mon Aug 31 2026

VFR conditions through the TAF period. A few scattered storms are developing across north-central Kansas which will move into southeast Nebraska early Monday, mainly 10-14Z at the area terminals. Otherwise, light winds at the terminals with winds mostly out of the south or southwest. Winds shift to northwesterly Monday morning, turning more west or southwesterly Monday afternoon. Could see a few more isolated showers and storms between 18-22Z this afternoon (20% chance).

OAX WATCHES/WARNINGS/ADVISORIES

NE...None. IA...None.