textproduct: Omaha/Valley

KEY MESSAGES

- Scattered showers and storms continue overnight. Warmer weather returns on Monday, with highs in the upper 80s to low 90s. More storms are possible Monday night, especially in northeast Nebraska.

- High temperatures soar into the mid to upper 90s across southeast NE and southwest IA Tuesday before a cold front brings another chance for showers and storms.

- Cooler weather returns Wednesday and beyond, with highs in the upper 70s to mid 80s.

DISCUSSION

Issued at 1031 PM CDT Sun Sep 6 2026

Tonight and Monday...

Water vapor imagery and objective analysis late this evening depicts a high amplitude mid-level ridge over the central CONUS, with a cutoff low moving into the Pacific Northwest. A shortwave trough pushing around the ridge and into extreme eastern NE and western IA brought scattered thunderstorms to the area this evening. A few showers may linger into the overnight period as a branch of the LLJ noses into the area along with some low-level moisture transport. Otherwise the broader cluster of thunderstorms over western Iowa pushed an outflow boundary westward into the area this evening, bringing a noticeably cooler air mass to portions of the area. Overnight lows are expected to dip into the upper 60s to low 70s.

Into the beginning of the work week, the aforementioned Pacific northwest low will gradually deepen and pull east along the US/Canada border, helping to flatten the ridge in place and push a cold front through the area on Tuesday. A tightening surface pressure gradient ahead of the approaching system and mixing into stronger winds aloft will bring southerly wind gusts of 25-35 mph on Monday. High temperatures will remain above average, peaking in the low to mid 90s for most.

Another round of showers and thunderstorms is expected Monday night into early Tuesday as the main wave approaches. Additional support will come from a 45-50 kt LLJ streaming low-level moisture transport into the area. In response, elevated thunderstorms are expected to develop late Monday evening into the overnight period. A few strong to severe storms will be possible as MUCAPE values reach 1250-1500 J/kg and bulk shear around 25 kts, though these values improve over the north side of the NE/SD line. Pockets of hail and gusty winds will be the primary hazard across northeast Nebraska, with PoPs of 50-75% in place, decreasing southward.

Tuesday...

High temperatures on Tuesday will depend on how quick the northeast- to-southwest oriented cold front pushes southward across the area. Highs are expected to reach the mid to upper 90s, with heat index values around 102-108, across southeast NE and southwest IA, with values peaking in the upper 80s further north where the front passes through before peak daytime heating. A Heat Advisory will likely be needed for portions of the area, with the extent depending on timing of the front and cloud cover extent. Scattered showers remain possible along and behind the front through the day.

Another round of storms, with a few strong to severe, is expected Tuesday afternoon and evening across eastern Nebraska into southwest Iowa as the front pushes through a more unstable airmass. With the better large-scale forcing for ascent displaced to the northeast, details will likely hinge on mesoscale features that come into focus with time. Shear appears to be the limiting factor, though may be sufficient for a stronger cores that eventually push out pockets of hail and gusty winds. PoPs will taper off from north to south into early Wednesday.

Wednesday and Beyond...

Zonal flow aloft will return by mid-week, pushing high temperatures back into the 80s, with a few locations only peaking in the upper 70s on Wednesday and Thursday. Overnight lows into Thursday morning are expected to dip into the upper 50s and low 60s. For reference, Omaha last dipped below 60 degrees on August 27, with the previous occurrence all the way back on June 23, so the morning should feel noticeably crisp. A brief mid-level ridge sliding across the area will push Friday highs back into the upper 80s.

Relatively dry conditions are expected through the remainder of the work week, though a weak shortwave bringing periodic precipitation chances can't be ruled out. Good news for the fall-lovers, looking further ahead, most GEFS and EPS-AIFS members bring a potent trough across the northern Plains next weekend. This system will bring a push of cooler air into the region and could knock highs in the 70s by the end of next weekend, though details on timing and extent will still need to be ironed out. The passage also brings PoPs of 30-40% back into the region.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1212 AM CDT Mon Sep 7 2026

Expect dry VFR conditions over the next 24 hours with southeastern winds of about ten knots. Wind speeds will increase after sunrise on Monday with occasional gusts over 20 knots. Low-level wind shear may develop around midnight Monday night but has not yet been added to the TAF forecast.

OAX WATCHES/WARNINGS/ADVISORIES

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