256 FXUS63 KOAX 290542 AFDOAX Area Forecast Discussion National Weather Service Omaha/Valley NE 1242 AM CDT Mon Jun 29 2026 .KEY MESSAGES... - Dangerous heat is expected to continue through at least Monday, with heat index values reaching 105 to 110 degrees in some areas. Overnight minimum heat index values remain in the upper 70s. - A few strong to severe storms are possible Monday and Tuesday evening, especially across northeast Nebraska. - Hot and humid weather continues into next week, with occasional evening and overnight storm chances. && .DISCUSSION... Issued at 1111 PM CDT Sun Jun 28 2026 Actual afternoon temperatures, peaking in the mid- to upper 90s today, were enough to set a new record at Valley (95F POR since 1994) but only enough to tie the warmest temperature of the year so far at Eppley set back on *March* 21st at 96F! Heat indices ended up peaking near forecast maximums today, leaving it the hottest day of the year in that regard. 100F to 110F heat indices were common with Eppley holding a heat index of 102 at 9pm. Skies remain clear overnight and through mid-day Monday, offering no reason to think the powerful June sun won't leave Monday another scorcher. Overnight temperatures will keep homes with no A/C very difficult to keep cool, for that reason the heat advisory and extreme heat warning continuing overnight for all but the northwestern portion of the area where afternoon temperatures and heat indices are expected to slip below advisory criteria tomorrow. Regardless, it'll be hot everywhere. Lower humidity in the northwest will keep maximum heat indices peaking closer to 100F on Monday while 105-110 will be common elsewhere. At least we'll have the benefit of breezy southerly winds once more. Despite feeling like a blast furnace, the breeze does make it easier to cool via sweating. Expect maximum gusts of 24-38 mph. The upper pattern sees a mid-level trough spinning over Montana tonight and another developing in Colorado with an attendant sfc low. A cold front is draped from Denver to Bismarck and the warm front snaking east of the complex has pushed well into South Dakota. As this mid-level low pushes east along the international border on Monday, it'll drag the cold front farther east and pushing the heat axis deeper into Iowa. That front is expected to push into this CWA in the evening hours from the west. Ahead of the front, the heat and humidity will lead to a very unstable airmass (4 kJ/kg), but capping will be an issue as will a lack of forcing. Guidance is pretty consistent on waiting to initiate convection along the front at around 00Z, although guidance is often an hour behind the real world. Initial supercells are possible but as the sun sets and the nocturnal jet increases wind speeds relatively parallel to the boundary, updraft/cold pool interference would quickly lead to upscale growth and an increasing wind damaging potential. The SPC has the northern portion of the area under a slight risk of severe weather (2 of 5). PoPs The cold front's settling into the area will help calm winds and push dewpoints lower Monday night, but will offer little relief from the heat. .TUESDAY... It'll still be toasty with highs in the 90s and max heat indices still peaking near 100-105 for areas along and south of the Platte River and I-880. The heat headlines will continue into Tuesday evening. The front will retreat northwest, but remains in the vicinity with a very unstable airmass forecast to develop east of it. There's plenty of uncertainty, but severe storms could be triggered in such an environment. We're currently progged at a marginal threat (1 of 5) of severe weather. .LONGER RANGE... Finding ourselves in a possible 'ring of fire' along the edge of a heat dome leaves the area open to the threat of daily convection. Machine-learning forecasts based on the EC and GFS keep the daily threat of severe weather in the forecast area at 10-20% through Saturday. Expect occasional convective outlooks. For this reason, the heat headlines (advisory/warning) have yet to be extended. Convective chances and a front in the area introduce too many variables for much certainty in temp forecasts. While there may be an occasional break in the heat due to unexpected cloud cover, rain, or thunderstorm outflow, the overall pattern will remain conducive to hot summer temperatures. Temps will begin to climb again by the end of the week when western CONUS ridging is expected to redevelop. Saturday night brings a good chance (35-50%) of precip as the remnants of tonight's western CONUS trof finally ejects east. Things will cool behind that trof. At least temporarily. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1242 AM CDT Mon Jun 29 2026 VFR conditions under mostly clear skies through the TAF period. Main concern will be low-level wind shear as winds weaken overnight at the surface while a strong low-level jet is located just off the surface. Expect a 30kt+ wind difference from the surface to 1800ft overnight with winds aloft a little more out of the southwest. This wind shear should clear up around 14-15Z as surface winds increase. Winds will stay out of the south through Monday afternoon, gusting 20 to 35kt, weakening again after 00Z. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...Extreme Heat Warning until 9 PM CDT Tuesday for NEZ052-053. Heat Advisory until 9 PM CDT Tuesday for NEZ015-034-044-045- 050-051-065>068-078-088>093. IA...Extreme Heat Warning from 1 PM this afternoon to 9 PM CDT this evening for IAZ043-055. Extreme Heat Warning until 9 PM CDT Tuesday for IAZ056-069-079- 080-090-091. && $$ DISCUSSION...Nicolaisen AVIATION...McCoy