Area Forecast Discussion

KEY MESSAGES

- Saturday's highs will reach the upper 80s and lower 90s with isolated showers and thunderstorms, before a slight cooldown and more widespread thunderstorms on Sunday.

- A pattern shift over the weekend will result in several disturbances moving through the region heading into next week. Daily chances for precipitation are expected for at least a portion of the area each day. Additionally, temperatures climb well into the 90s with potential excessive heat concerns.

DISCUSSION

Issued at 109 PM CDT Fri Jun 5 2026

Several inches of rainfall occurred across portions of Southeast Nebraska and Southwest Iowa Thursday afternoon into early this morning. This system is now moving east of the region, but has slowly pushed a front into the area. This front becomes the focal point for our weather this evening and tonight. In the meantime, a few elevated showers and thunderstorms linger over Northeast Nebraska and west-central Iowa early this afternoon. Impacts from these should be limited with perhaps a brief downpour possible. Subsidence increases this afternoon behind the aforementioned system, resulting in clearing skies. Highs rise well into the 80s under the plentiful sunshine. With a cap in place, instability builds through the afternoon, likely exceeding 3000 J/Kg by evening. This instability, coupled with the front, and increasing westerlies with a passing disturbance support thunderstorm development by late evening.

With plenty of instability and sufficient shear an all severe hazards threat is expected. This threat should gradually lessen tonight as thunderstorm clustering and low-level stability increase. The threat transitions to more of a flash flooding concern. Many areas across Southeast Nebraska and Southwest Iowa received 2-4" of rainfall already. An addition 1-2" appears likely for much of these same areas with perhaps locally higher amounts of 2-4" possible. A Flash Flood Watch has been issued through tonight with this expectation. Other areas, including Beatrice, up through Omaha, and into Pottawatomie County may also see significant rainfall, but lingering uncertainty on the heaviest band of thunderstorms and more limited rainfall yesterday casts doubt on widespread flooding potential at this time.

Heading into Saturday, a mostly dry day is expected for many as temperatures warm through the upper 80s and low 90s. A few widely scattered showers and thunderstorms may sneak into Southeast Nebraska and Southwest Iowa later in the afternoon into the evening. Temperatures cool slightly on Sunday as more widespread showers and thunderstorms are expected in association with a trough lifting through the Plains into the Mississippi River Valley.

Beyond this weekend, a pattern shift takes hold. Mid-level ridging overspreads much of the central and eastern CONUS with troughing over the western CONUS. These changes support an increase in temperatures well into the 90s by the middle of next week, perhaps near 100 for some. This may lead to excessive heat concerns and will be monitored closely. With the trough to the west, a series of disturbances round the ridge and should support daily shower and thunderstorm potential for at least some of the area. As a result, it may feel closer to July then mid-June next week.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1240 PM CDT Sat Jun 6 2026

VFR conditions are expected to hold through the majority of the TAF period, with a few low clouds floating along between KLNK and KOMA at FL021 while gradually lifting. Winds will be out of the southeast and have been coming in a bit lighter than previously forecast, with speeds still expected to reach over 10 kts this afternoon before falling off again overnight. A few thunderstorms will be possible late this afternoon/early evening, but should stay to the southeast of KOMA. Otherwise MVFR ceilings move in sunrise to mid-morning tomorrow at KLNK then KOMA, as scattered light showers move in from the south.

OAX WATCHES / WARNINGS / ADVISORIES

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