textproduct: Hastings

KEY MESSAGES

- Highs will range the 90s to low 100s (as high as 105 degrees) Sunday through Tuesday afternoon. Heat index values will mainly spread 100-105 degrees.

- Though a few isolated storms may pop up across some more isolated areas tonight and Sunday, the next "best" chance for a more spread out coverage of storms will come Monday evening. Low model consistency keeps our confidence relatively low at this time (20- 30%).

- The stronger and best potential for storms looks to lie north of I- 80 Monday evening. A few of the stronger storms may be capable of producing either severe hail up to the size of quarters or damaging thunderstorm wind gusts up to near 60MPH.

- Highs beyond Tuesday will be expected to continuously decrease down to the 70s by Friday.

- Daily afternoon to evening thunderstorm chances return each day between Wednesday and Friday.

DISCUSSION

Issued at 359 PM CDT Sat Aug 8 2026

Following the storms this morning to early afternoon across central Nebraska, most of the area should remain dry until at least Monday evening (next best widespread storm chances; 20%-30%). Sporadic and isolated thunderstorm activity rolling in and out of the area, however, can't be completely ruled out within a few more isolated locations tonight or Sunday. Due to low run to run model consistency, our confidence falls on the lower end of the spectrum in regards to determining exactly where and when storms may emerge. Given general weak forcing and limited shear (<40kts), the potential for widespread convection appears unlikely at this time. In terms of tonight, the best potential for any isolated storms would fall mainly across north central Kansas or far southern Nebraska where the outflow boundary from this morning's storms resides. Even then, the confidence remains low (<20% for any given location).

The other factor that looks probable to reemerge again tonight would be the potential for fog (60% chance). As with the last two nights, calming winds with high surface relative humidity values (temperatures cooling near their dewpoints) may be just strong enough to help with the production of some surface condensation (fog). Given the higher dewpoints towards the north, the better potential for fog formation should fall north of I-80. The HRRR and other HREF members have additionally seemed to target central to north central Nebraska for fog development tonight (identified by 60% of the HREF members).

The main story for Sunday will be the heat. Steady southerly warm air advecting winds paired with mostly sunny skies will work in tandem to help temperatures warm to their likely warmest point of the week. Highs for the day will be expected to span the 90s across a majority of south central Nebraska. A few locations across the far southern row of counties in Nebraska may even reach the triple digits (20-40% chances). Even warmer temperatures south of the state line will be possible to set up as highs spread the upper 90s to up to 105 degrees across north central Kansas (20-40% chance for highs to reach 105 degrees). Heat index values for a majority of the area should range between 100-105 degrees. Although higher amounts may be possible across isolated north central Kansas locations, a few uncertainties hinders our confidence to a degree.

The decision to hold off on the issuance of a heat advisory was well discussed this afternoon between neighboring offices. A few questions have been raised about if the elevated wildfire smoke may limit the solar flux as well as if the marginal dewpoints (50s to low 60s) would be high enough to raise heat indices above 105 degrees. The higher humidity values (mid 60s to low 70s) are forecast to linger across central Nebraska locations, or areas where temperatures are not likely to surpass the mid 90s. Given the time of year and the uncertainties, the issuance of a heat advisory was held off this forecast cycle.

Looking ahead at monday, the next best chance for scattered thunderstorms returns for primarily the northern half of the area during the evening to overnight hours. At the surface, a weak low emerging out from the Rockies may help steer another surface boundary down into southern Nebraska (may provide some weak convergence based assent). Given the warm (90s to low 100s highs), moist (mid 60s to mid 70s dewpoints) and unstable airmass (MUCAPE up to 3,000-5,000J/km), any storms that develops may have a shot at becoming strong to severe. The only limiting factor would be from the marginal shear (20-35kts). The SPC keeps most areas north of I-80 included in a marginal severe weather outlook.

In terms of the pattern aloft, the region falls inbetween broad ridging to the west and broad troughing to the east. This leaves the area underneath northwest flow. Long-range forecast models continue to hone in on a more zonal (less amplified) pattern transitioning to a to slight ridging (higher pressure) pattern near the middle of next week for the Central U.S. A few other notable trends that exist in the long-range forecast includes a slightly wetter and cooler period near the midle-to-end of the week. Highs in the forecast dip a few degrees each day from Tuesday to Friday with highs likely to return back to the 70s (70-90% chance). Daily afternoon to evening thunderstorm chances additionally lie between Wednesday and Friday. This wetter pattern will come as a few upper-level waves may try to break out of a Western U.S. trough.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1243 PM CDT Sat Aug 8 2026

For KGRI/KEAR Airports:

A few scattered thunderstorms will soon be out of the KGRI terminal space by 18:30z. In addition, ceilings should lift out of MVFR conditions around the same time. Though a few clouds may linger around for the next few hours, VFR conditions will be likely to maintain until at least midnight tonight.

Visibility reductions due to fog will again be possible for both KEAR and KGRI. Visibilities between 8-14z could drop due to light fog, though dense fog and visibilities into IFR classifications will be unlikely (20-30% chance).

Winds, briefly interrupted by a passing front, will soon settle back towards a southeasterly direction for the rest of the afternoon and evening hours. Speeds near 15kts may gust as high as 25-30kts before winding down this evening. Lightening winds overnight will become variable once more with a transition back to north/northeasterly winds Sunday morning.

LLWS will be expected to persist between mainly 2 and 13z. Low- levels winds out of the southeast (180-2300 degrees) may gust as high as 40-50kts around 1,000-2,000ft above the surface.

GID WATCHES/WARNINGS/ADVISORIES

NE...None. KS...None.