textproduct: Omaha/Valley

KEY MESSAGES

- Showers and storms waft in from central Nebraska overnight, with a few areas of gusty winds 40-50 mph possible (20% chance) after 2 AM.

- Hot temperatures in the mid to upper 90s with heat index values near 100 are expected Sunday.

- Above-normal temperatures and periodic thunderstorm chances continue next week.

DISCUSSION

Issued at 1105 PM CDT Sat Aug 29 2026

Tonight and Sunday:

Water vapor imagery this evening features a prominent mid/upper low pushing through the Pacific Northwest, with a broad belt of ascent to its southeast pouring over the norther half of the CONUS. Zooming in locally, a messy surface pattern is in place due to that belt of ascent kicking off pockets of showers and storms from the High Plains, aiming their remnants towards eastern Nebraska and Iowa. While those decaying showers approach, they will be joined by additional elevated convection that is already starting develop across far southwestern Nebraska before moving through eastern Nebraska during the overnight hours. 00z soundings from both LBF and OAX show notable dry layers in the lowest 300 mb, going alongside modest MUCAPE values to sustain storms with a low-end potential for damaging wind gusts taking advantage of the strong low-level flow overnight. Latest runs of the short-term models have those showers and storms entering the forecast area from the west at 2 AM, moving out of the area to the east around 8 AM.

After some isolated showers stunted afternoon warming today, temperatures quickly rebounded and topped out in the upper 80s to 90s across the area, working with uncomfortable dewpoints in the upper 60s to mid 70s. A repeat of this should happen Sunday, where morning showers and storms stunt initial warming while steady southwesterly winds help temps climb into the 90s area wide. Heat indices are forecast to top out in the 100-104 range across southeast Nebraska and southwest Iowa, where lingering high dewpoints will exist into the afternoon hours while areas north of there see some dry air keep conditions more bearable for those outside. CAMs keep pockets of afternoon showers possible, and will be the main failure mode for the hot forecast, though you will not find a meteorologist around that wouldn't mind underachieving temperatures in place of stifling heat. Heading into the overnight hours, elevated convection with low-end downburst potential develops once again on the nose of the low-level jet, mostly across southeast Nebraska.

Monday and Beyond:

Warmer than normal temperatures continue to define the forecast through the work week as southwesterly mid/upper flow early turns into a building ridge that takes over the central CONUS heading into the weekend and early next week. Highs in the upper 80s to 90s will continue to hold on as cooler air is stuck well to the north, leaving many folks attending school-related outdoor activities and practices wishing for the fall weather to arrive.

With no strong cold fronts to clear out moisture across the area, severe storm potential exists Monday afternoon into the overnight hours across Nebraska and Iowa where a weak boundary will sit. Early peeks at the extended CAMs shows little in the form of afternoon storms, but that amount of moisture with the added lift of an incoming shortwave from Colorado could be enough for a few to form or waft in from the west. The uncertainty for storms only increases Tuesday into the remainder of the week, where steep lapse rates remain close to the area, juxtaposed to increasing influence of ridging in the mid/upper levels to reduce the ambient shear. We'll rely on pulse thunderstorms as our moisture for the area, with no particular day through the week showing widespread rainfall despite daily chances (though only 10-20%) for showers and storms.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

Issued at 1150 PM CDT Sat Aug 29 2026

VFR conditions through the TAF period. Winds will continue to be the primary concern with low-level wind shear overnight. While surface winds have weakened, winds just off the surface at FL015-FL020 have strengthened with winds of 45-50+ kt expected out of the south-southwest. These will continue until around 15-16Z when surface winds start to pick back up as winds aloft ease. We'll see south-southwest winds through the day on Sunday with gusts to 20 kt into the afternoon. Expect winds to ease again going into the evening.

We are watching storms over central Nebraska for potential they move across eastern Nebraska overnight. Confidence is low in where these storms will track so have left out of the TAFs for now, but there is about a 40% chance storms impact the terminals, around 08Z at KOFK, 09Z at KLNK, and 09-10Z at KOMA. The main hazard with these storms is the potential for strong surface winds out of the southwest to 50+ kt. Could be a few isolated showers/storms Sunday afternoon as well (15% chance).

OAX WATCHES/WARNINGS/ADVISORIES

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