textproduct: Hastings

KEY MESSAGES

- Active weather pattern next few days with multiple chances for thunderstorms off and on for portions of the forecast area.

- There is a Slight Risk (level 2 of 5) that some of these storms will be severe, though there remains considerable uncertainty regarding specific timing, location, and magnitude of severe threats.

- Hot temperatures Tuesday and Wednesday

- More seasonable temperatures and periodic rain chances are expected late week and into the weekend.

UPDATE

Issued at 645 AM CDT Mon Jun 8 2026

Issued an SPS for areas of dense fog, mainly E of Hwy 281. Airport observations and webcams indicate some 1/4 to 1/2 mile visibilities in this area...on the edge of a broader low stratus deck. This fog appears to be fairly shallow, so with the very high June sun angle think we'll see some quick improvement between 8am and 9am. So a short duration, but intense, bout of fog this morning.

UPDATE

Issued at 520 AM CDT Mon Jun 8 2026

Fairly complex weather pattern expected next couple of days as it pertains to thunderstorm chances, with a lot of different possibilities and not a lot of certainties.

First off this morning...scattered thunderstorms have developed over the Nebraska Panhandle along a weak sfc trough, and aided by low level upslope flow and convergence on the nose of a low level jet (LLJ). CAMs have generally trended more aggressive with this activity - which seems warranted given some decent cores observed on recent radar scans. Progged Corfidi/bulk shear vectors and veering LLJ favors E/SE movement, perhaps into far W zones by around 12-13Z. What happens with the activity during the rest of the morning - in which CAMs still have a wide range of solutions - will likely play a significant role in convection details later this afternoon and into the overnight.

Some models continue this first round slowly SE throughout the morning, never really killing it off before a potential re- invigoration with building heat and instability during the mid to late afternoon. Outflow from this convection may also reinforce a warm front stretching NE/E from a deepening sfc low in SW Kansas, which could provide a source for sfc lift, as well. Any locations that remain ahead of the outflow and/or near the warm front will develop strong instability given sfc temps in the 80s, dew points well into the 60s, and steep mid level lapse rates. Modest W/SW upper flow atop low level easterlies (reinforced by the deepening sfc low in SW KS) will provide adequate shear for organized convection and supercells. Neutral or rising mid level heights will mean that afternoon convective potential will be strongly dependent on the low level convergence provided by the outflow from AM storms, and/or subtle warm front/differential mixing zone. Are either of these in our forecast area during peak heating...or are they just to the S? This is the first bout of significant uncertainty.

The other area of uncertainty is related to late eve and overnight storm chances from convection that develops along the Front Range/High Plains this afternoon, then shifts E into SW NE and/or NW KS this evening. Some model guidance rolls an MCS across a good portion of the area overnight, of which there would likely be a damaging wind threat that accompanies the leading edge. However, other guidance has trended weaker with this later round, seemingly due to (at least in part) any convection that may be ongoing in central KS "robbing" this second round of better instability and lift from another LLJ. 24 hours ago, CAMs were putting an intense MCS across mainly our NE zones...whereas recent trends have been further S. Feel like the 06Z HRRR offers a reasonable idea of where the most favored track would be - roughly along and S of the state line - but again, there are significant uncertainties regarding intensity. Timing of this round, were it to occur, would favor late night into early morning hours.

Tuesday offers another round for thunderstorm chances as a lead shortwave impulse in the active SW upper flow has trended faster and more favorably timed to our peak heating in the late afternoon and early evening. This general mid to upper level setup appears fairly clear and straightforward. The biggest uncertainty on Tuesday comes down to behavior of a dry line surge and just how deeply we mix the boundary layer. Some guidance keeps the dry line surge mostly SW of the area and keeps dew points in the upper 60s to lower 70s...whereas other guidance is much drier (and hotter). This setup seems somewhat similar to a day earlier this spring where the aggressive mixing models (i.e. GFS) were overdone, and we held onto higher BL moisture, and thus, lower LCLs. Therefore, I tend to favor a slower dry line progression, which could increase our supercell severe weather potential. However, regardless of how the BL plays out, the more favorable timing of the upper shortwave should allow for convective development either way. If the deep mixing indeed pans out, then convection would largely be high- based and prolific damaging wind producers. A more shallow boundary layer could bring more large hail into play, and perhaps even a few tornadoes.

So...a lot of uncertainties on details, but the bottom line is that the next couple of days look fairly active, and severe weather will be possible. Depending on how the specifics play out, could see portions of our area being upgraded to an Enhanced Risk (level 3 of 5) one or both days (Mon & Tue).

Last thing I want to note is that Tuesday still looks quite warm with highs in the 90s to low 100s. Fortunately, there will be a decent breeze across the area, and far W/SW zones should be dry enough such that heat indices aren't much different than the air temps. Thus, don't foresee needing heat headlines at this time.

DISCUSSION

Issued at 346 PM CDT Sun Jun 7 2026

Short Term...Tonight and Monday

Though a few isolated showers or weak thunderstorms across our eastern Nebraska locations remain possible through this evening (10- 25% chance east of HWY-281), most areas across the region are likely to remain dry overnight. The potential for fog may also be possible tonight given clearing skies and lightening southeast winds. If fog does develop, a few patches of dense fog may have to be monitored to see if coverage becomes widespread enough for a dense fog advisory. The main concern in the short-term period, however, will be in regards to the potential for severe convection Monday afternoon to mainly Monday night from the presence of a passing cold front.

Synoptically-speaking, a shortwave trough sliding up through the Midwest today will make space for the eastward expansion of a longwave North Pacific U.S. trough. This feature is expected to become the prominent driving force for the mid-to-upper level pattern this week, influencing the areas' precipitation chances.

As far as Monday goes, weaker yet steady southeasterly winds at the surface, will help advect in more moisture (mid 60s to lower 70s dewpoints). In addition, though there is still some uncertainty with how expansive cloud coverage will become, temperatures are expected to inch a few degrees higher than today (highs nearing the upper 80s to low 90s). This warmer and slightly more moist airmass will increase atmospheric instability, likely inflating CAPE values up to between 2,500-4,000J/kg (mid to higher end values for rapid thunderstorm growth). In addition, modest shear (25-35kts of bulk shear) with supportive low-to-mid level lapse rates (7-9 C/km) appear to set the stage for severe weather anywhere storms fire. As result of the supportive environment, a Marginal SPC severe weather outlook is in effect across the full area for Monday.

So, what is the catch? Like with all forecasts, there is still some uncertainties that could change the way that the event plays out. As of now, the collection of models continue to sort into two leading scenarios. The first concern regards the forcing mechanism. The absence of notable mid-level vorticity advection from an approaching trough/PV anomaly, leaves us to believe that any convection that forms for Monday will be locally forced rather than from synoptic assent. In other words, the development of thunderstorms will likely be tied to the passage of the passing cold front.

The main contributor to the uncertainty for Monday is with the timing of this frontal passage. The main divergence between the HRRR/GFS and NAMNEST/NAM/ECMWF models today is with the timing/location of this front. The HRRR/GFS models are currently suggesting more aggressive convection in the evening to overnight hours with the front passing through later in the day. A later passage of the front would allow more time for the environment to destabilize (additionally taking advantage of the nocturnal LLJ). If this scenario actualizes, a MCS may be favored to race through much of our area (at least 50%, the best potential north of the state line). The main concerns would be strong straight line wind gusts up to 70MPH with large hail or an isolated tornado possible.

The other case, however, would still support the potential for severe weather, though storm activity may be more dispersed through the day and more spotty in coverage compared to widespread. The NAM/NAMNEST/ECMWF models have been a little faster at advancing the front, potentially seeing storm activity initialize earlier in the day before the instability is maximized. Though severe weather will still be possible and earlier in the day, activity may not be as widespread as if the activity occurred later in the evening/nighttime.

As it stands, there is two main scenarios that could play out that could effect when storms develop and how widespread impacts may become. Either way, the environment looks to be supportive for severe weather across at least a portion of the area Monday afternoon to night.

Long Term...Tuesday and Beyond

Following the potential for severe weather on Monday, a more limited coverage of severe storms may follow on Tuesday (20-30% chance). Given warming temperatures, continued afternoon instability and slightly increases shear from the approach of the Northwest U.S. trough, the potential for severe weather will remain possible for Tuesday. The main concern at this time will be if Monday nights' storms affect Tuesdy's environment, potentially limiting instability from any lingering morning showers.

Besides the returning storm chances, temperatures look to continue to be on track to near and reach the low triple digits across a few north central Kansas and far southwest Nebraska locations. The rest of the area will likely see highs in the mid-to-upper 90s Tuesday. These warmer temperatures will mainly be assisted by steady southerly warm air advecting winds blowing between 15-20MPH and gusting as high as 30-35MPH. Heat indices will likely reach the upper 90s to as high as 105 degrees across the full area. As result, a Moderate to Major heat risk classification (levels 2 & 3 out of 4) will be in place across the area. It is suggested that any individual who may be more susceptible to the heat to have an effective source for cooling/hydration. The only factor that could prevent temperatures from reaching this high would be if cloud coverage becomes more widespread or showers/storms Tuesday morning overstay their welcome.

A secondary/reinforcing cold front passing through the area Wednesday will likely keep the warmup from lasting past Wednesday as temperatures Thursday through the end of the week should not surpass the 80s to low 90s. A few more additional chances for storms lie in the extended period overnight Wednesday (15-40% chances), Friday night (15-30%) and Saturday (20-35% chances). Given limited uncertainty in how the upper-level pattern will unfold the second half of the week (progression and timing of the upper-level trough), limited details are currently known on the intensity, timing and coverage of these potential storms.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/

Issued at 645 AM CDT Mon Jun 8 2026

For KGRI/KEAR Airports:

Today: GRI will continue to right on the edge of some fog/very low stratus. AUH is reporting LIFR conditions, but webcams and satellite are showing the edge of these conditions about 5 miles E of the airport. May see a brief expansion into the terminal space over the next hour, but believe we'll see fairly rapid dissipation between 13-14Z. Doesn't appear this fog will threaten EAR. The rest of the day should be VFR with light NE-SE winds around 7-12kt. There's a chance that convection could work in from the W later this morning, esp. at EAR, but only slow movement thus far casts considerable uncertainty on this.

Tonight: Main item of concern is the potential for convection with strong, gusty winds to possibly move in from the west after midnight. Model guidance is quite varied on the timing, track, and intensity of this potential bout of convection, so only have PROB30 groups in the forecast for now. Wind will be light away from any thunderstorms.

GID WATCHES/WARNINGS/ADVISORIES

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