textproduct: Omaha/Valley

KEY MESSAGES

- Hot and humid weather continues with heat index values in the low 100s for much of the area. A Heat Advisory is in effect for much of the area this afternoon and continues for southeast Nebraska and southwest Iowa Saturday.

- Oppressive heat will continue into next week, with warm lows in the 70s will providing little relief.

- There will be periodic shower and storm chances (20-40%), especially during the overnight and early morning hours. Severe weather chances remain low (generally 5% or less), but a few storms could produce gusty winds and hail in northeast Nebraska Saturday morning.

DISCUSSION

Issued at 1242 PM CDT Fri Sep 4 2026

Relatively quiet across the area early this afternoon with upper level ridging largely in control. However, there were some isolated showers/sprinkles associated with some passing weak shortwave energy and low-level moisture convergence. Additional showers and storms moving across southwest into central NE may sneak into the forecast area this afternoon, though most short term guidance is in good agreement that they diminish significantly prior to getting here, so carrying only a 20% chance toward the Norfolk/Albion/Columbus area. The main story today and going forward, however, is the heat. As of noon temperatures were hovering around 90 with dewpoints in the lower to mid 70s. This was yielding heat index values approaching 100 in many locations, with temperatures only expected to increase through the afternoon. A Heat Advisory will remain in effect for most of the area this afternoon and will continue through Saturday for southeast Nebraska and southwest Iowa, with heat index values climbing into the 105-110 range for some spots. Temperatures "cool" slightly for Sunday and Monday, though still looking at highs in the lower to mid 90s with heat index values approaching 100. In addition, overnight lows look to remain in the 70s for most, so not much relief coming with sunset.

Otherwise, we'll see continued on and off shower and storm chances the next several days, especially during the overnight and early morning hours as the low level jet/moisture transport point toward the area. While we should have a decent amount of instability in place through the weekend and into early next week, any notable deep layer shear looks to remain well to our north, so any storms that do develop look like they'll be unorganized and fairly short-lived (i.e. they'll go up and quickly rain themselves out, possibly pushing out some stronger wind gusts as they collapse). For tonight/Saturday, latest short-term guidance suggests storms go up in northeast NE or SD around 2-3 AM Saturday, and gradually edge southeastward as outflow produces gusts of 40-50 mph in our area. While consensus suggests primary storms will initiate over SD, if that shifts south, the risk for damaging 60+ mph winds and some hail will increase in our area. As it stands, have a 20-45% chance of precip near and north of Norfolk, with a 5% chance of a severe storm. Any gusts should eventually taper off as they approach the Platte River by mid-morning. It'll be worth watching how long any debris clouds linger, as they could have a large impact on the temperature forecast Saturday.

Then for Sunday into Monday, we'll have a surface boundary that parks itself from northwest to southeast across the area that will likely provide another focus for storm development as early as Sunday afternoon. However, questions remain on timing, as there could be some lingering morning storms which could delay additional storms until moisture transport picks up in the evening/overnight.

We finally see at least a little relief from the heat toward Wednesday following the passage of a cold front Tuesday afternoon/evening. However, temperatures behind the front look to remain in the mid 80s to lower 90s through the remainder of the work week. The front will also bring chances for showers and storms and possibly our highest potential for any severe weather through the week, as there could be a little bit better overlap of shear and instability, though that window is pretty small. For the rest of the week, instability looks to be limited, though we will have continued spotty shower and storm chances as various bits of shortwave energy slide through and moisture transport points into the area at times. Severe weather chances remain low given the lack of instability, but can't completely rule out something getting organized given the increased shear. Machine learning guidance gives us about a 5% chance Wednesday through Friday.

AVIATION /00Z TAFS THROUGH 00Z SUNDAY/

Issued at 608 PM CDT Fri Sep 4 2026

VFR conditions are expected to continue through the next 24 hours, with the area of showers to the west struggling to make it any farther east while southerly winds decrease in speed through the evening. Around 08z an area of showers and storms is expected to develop across southeast SD, kicking out a wind shift and some periodically gusty winds that arrive to the KOFK area closer to 14z. Once those winds dissipate, the entire area will be back to southeasterly winds at 10-15 kts through 00z.

OAX WATCHES/WARNINGS/ADVISORIES

NE...Heat Advisory until 7 PM CDT Saturday for NEZ044-045-050>053- 065>068-078-088>093. IA...Heat Advisory until 7 PM CDT Saturday for IAZ055-056-069-079- 080-090-091.