textproduct: Omaha/Valley

KEY MESSAGES

- Severe thunderstorm chances return this afternoon into early Monday. All severe weather hazards will be possible, especially in southeast Nebraska.

- Training storms could produce heavy rainfall and flash flooding in far southeast Nebraska/southwest Iowa overnight.

- Near-normal temperatures are expected next week with little to no additional chances for precipitation forecast.

DISCUSSION

Issued at 121 PM CDT Sun Apr 26 2026

A complex storm system will bring multiple chances for storms and potentially severe weather to the region today and into Monday. A shortwave pushing across south western Kansas will help induce a low pressure system out of the Rockies today. By 7 AM, storms began firing over west-central Kansas, ahead of the approaching shortwave. And continued to push east northeast into northeast Kansas, with widely scattered showers and storms beginning to spread across the forecast area this afternoon. Storms are expected to continue to advance toward southeast Nebraska. While the best chance for severe weather will lie just south of the Nebraska/Kansas border, a few storms north of the border may be capable of producing large hail and damaging wind gusts.

Behind this initial round of storms, the developing surface low is progged to track northeast towards southeast Nebraska, with another round of storms developing around mid night and continuing into the overnight hours. Storms will progress across northern Kansas into southwest Iowa, bringing the another round of strong to severe weather across southeast Nebraska during the early hours of Monday morning. Once again large hail and damaging winds will likely be the main threats, with a tornado or two possible. Additionally, several rounds of potentially training storms over southeast Nebraska and southwest Iowa could bring increased risk of flash flooding, especially to urban and low-lying areas. Therefore, a Flash Flood Watch has been issued for this evening through Monday morning.

Our third and final round of showers and storms will come Monday morning into the early afternoon. This convection appears to stem from a reinforcing cold front associated with a lobe of low pressure, just to the northwest of the main system, and interacting with the surface low to our southeast. With the timing of this round, instability could be lacking early Monday morning, however a stray strong or severe storm can't be entirely ruled out. The best chance for a severe storm currently looks to remain across southeast Nebraska into southwest Iowa, near the axis of instability and where shear vectors are strongest.

Storms finally exit the forecast area early Monday evening. Looking ahead, temperatures are expected to remain near seasonal normals through the upcoming week. A few weak shortwaves may bring us off and on low chances for showers and storms, but primarily dry weather is expected to prevail through the end of the week.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/

Issued at 625 PM CDT Sun Apr 26 2026

Convection is currently pushing out of the area at this time, but redevelopment is expected after dark. Have removed storm mention at KOFK due to uncertainty with timing and northern extent of the coverage. Have limited the window of convection at KOMA and KLNK to mostly overnight hours. Otherwise, concern will be lower cigs and reduced visibility due to patchy fog and rainfall. Have all three sites going to IFR category and KOFK slipping LIFR by 03Z Monday.

Weak southeasterly winds now will become northwesterly early Monday morning with gusts near 25-30 knots expected.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Flood Watch through Monday afternoon for NEZ068-090>093. IA...Flood Watch through Monday afternoon for IAZ090-091.