textproduct: Hastings

KEY MESSAGES

- Hot, humid, and breezy today before another chance of severe thunderstorms arrives late afternoon into the evening.

- There is a Slight (level 2 of 5) to Enhanced (level 3 of 5) Risk across the region. Damaging wind looks to be the primary threat, with a somewhat lesser risk for large hail.

- Will have one more chance for severe thunderstorms Wednesday evening and overnight, mainly for our portions of south central Nebraska. Large hail is the primary threat.

- Finally a quieter and eventually cooler pattern moves in later this week and continues into the weekend.

UPDATE

Issued at 433 AM CDT Tue Jun 9 2026

A few lingering showers/storms will dissipate this early morning and leave us with hot, humid, and breezy conditions by early afternoon. South winds 10-20 MPH and gusts 25-30 MPH will provide some modest relief from the humidity, and latest forecast heat indices have come down a degree, or two, to generally around a couple deg on either side of 100F. This falls short of our traditional heat advisory criteria, and not overly inclined to bend it since it's just one day and there will be a breeze. Nonetheless, probably going to be the warmest and most humid day so far this summer.

Attention then turns to our next chance for thunderstorms slated to arrive late this afternoon or into the evening. There remains a bit of uncertainty on the overall coverage of storms, but latest CAMs are in reasonably good agreement on the general evolution and timing. Expect scattered thunderstorms to develop up and down the High Plains by mid afternoon - with plenty of upper support coming in the way of one or two shortwave disturbances embedded within active SW upper flow. The strongest shortwave and upper forcing looks to focus from northern Nebraska into the Dakotas, so expect this activity to quickly grow upscale into a fairly solid line as it moves E/NE during the late afternoon and evening. It's a bit uncertain where the southern portion of this line tracks, but some of the recent trends suggest this could remain just N of our local forecast area.

00Z HREF suggests another, largely separated, area of focused development from SW KS into the central/southern High Plains, within a very hot and deeply mixed boundary layer. This activity may be a bit more scattered in nature owing to slightly weaker upper forcing, but should quickly shift NE during the late afternoon and evening as 30-40kt mid level jet streak overspreads the western edge of a large, strongly unstable warm sector. Deep inverted-v profiles and large surface T-Td spreads argue for a mainly damaging wind threat. As mentioned above, coverage with this activity remains a bit more uncertain, but if cold pools can develop and merge, then several quick-moving clusters/line segments with 60-70 MPH wind gusts will be possible. Deep layer shear vectors will be marginally supportive of some supercells (0-6km bulk shear ~25-30kt), and so could see some large hail, as well, but should be a secondary threat to the damaging straight line winds. The greatest risk for severe will be 5PM to midnight (perhaps only 10-11PM) and should see much quieter conditions for the second half of the night.

Wednesday looks to be fairly quiet during the daytime hours thanks to a relatively early passage of a weak cold front. The AM-early aftn frontal passage means the primary zone of low level convergence and storm development will focus further E, roughly along the I-35 corridor. Temperatures will be a few degrees lower than today - and less humid, but the initial surge of cooler air is fairly weak. Speaking of drier air, models surge relative humidity values as low as 15-20 percent into areas roughly along and W of Hwy 283 by late afternoon. Winds appear somewhat more marginal, but still breezy with gusts around 25 MPH. We're still considering these areas as having fuels "conditionally favorable" for large fire growth, so may ultimately need a Red Flag Warning depending on how things play out tonight. Unfortunately, some of these areas have been the driest over the past 7 days, and I don't think storms tonight will have much moisture with them.

Finally...touching briefly on Wednesday night's storm potential: several models develop one more round of thunderstorms in this recent stretch of active weather, this time largely of the elevated variety, driven by a very strong 40-50kt low level jet. This round may be nothing to sneeze at given potential MUCAPE values of 2-3K J/kg, steep mid level lapse rates, and strong effective deep layer shear (40-45kt+). This setup would favor elevated supercells with primarily a large to very large (2"+) hail threat that would probably focus more in Nebraska than Kansas. This round looks to be largely during the overnight period (after 10PM) Wednesday night.

DISCUSSION

Issued at 101 PM CDT Mon Jun 8 2026

Convection from this morning has left an outflow boundary draped across the area. Meanwhile, elevated convection is already ongoing near LBF and additional cumulus is developing near and along the remnant outflow. Near-term CAMs came into agreement this morning that the primary area of redevelopment will be in western portions of the area (possibly between McCook and Holdrege) in the 3-5pm timeframe. The strongest convection is then expected to push southeastward through the late afternoon and evening along the axis of greatest instability (3000+ J/kg MLCAPE). Deep-layer shear is also quite strong, with effective shear possibly approaching 50kts at times. Given the expected storm mode (multicell clusters merging into line segments), the primary severe threat is wind, although severe hail is also expected in some areas. Output from the CAMs would indicate that thunderstorm wind gusts of 70-80 MPH are possible. A tornado or two cannot be ruled out, although the higher threat appears to be to our east as the QLCS becomes more organized.

In addition to the severe threat, CAMs are indicating that these storms will be very efficient rainfall producers...which isn't surprising with PWAT values near 1.7" per mesoanalysis. The RRFS and HRRR indicate potential 2"/hr rainfall rates and localized totals of 3-4". As such, a Flood Watch was issued for portions of far southern Nebraska and north central Kansas.

Storms are expected to exit the area by around 10pm, but additional convection from the High Plains may roll in later overnight. Given the timing, these storms should not be as intense, but some strong to severe storms do remain possible into the early morning hours of Tuesday. This is a relatively new trend, so confidence in specifics remains fairly low.

Tuesday is expected to be the warmest day of the year so far in many areas. Aided by a strong southerly wind (gusts 30-40 MPH), high temperatures in the 90s and even low 100s are expected. Heat index values may briefly approach 105 degrees in eastern zones where dewpoints are higher.

The daytime should remain mostly dry, but scattered thunderstorms are expected to move west to east across the area during the late afternoon and evening hours. Confidence in coverage remains uncertain, but convective parameters (3-4000 J/kg MLCAPE and 30kt 0-6km shear) would be favorable for a least a few severe storms.

Wednesday will trend a bit cooler, and the main threat area for storms will shift to the south/east. That said, a few storms cannot be totally ruled out Wednesday evening into the overnight.

With the active weather in the near-term, not much time was spent on the longer-range forecast. After a break late this week, ensembles bring t-storm chances back to the area over the weekend and into next week. Models also favor a general "cooling" trend this weekend into early next week. Sunday and Monday could be feature highs in the 70s...which is about 10 degrees below normal.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 646 AM CDT Tue Jun 9 2026

For KGRI/KEAR Airports:

Today: May see a few hour period of SCT to BKN CIGs around 1500-2000 ft work in from the S 14Z-17Z. Otherwise, expect VFR through 00Z with breezy S winds gusting around 25kt for the afternoon.

Tonight: Main concerns will be scattered thunderstorms with gusty winds, along with low level wind shear (LLWS) from a strong low level jet (LLJ). Main timing of storm potential is roughly 02Z to 05Z, give or take an hour. Flt cat should remain VFR, but any storms will have potential for wind gusts of at least 40kt. A strong 40-50kt LLJ is forecast to ramp up around 02-03Z and likely persist through the remainder of the night. Surface winds outside of storms will be breezy out of the S.

Confidence: Medium.

GID WATCHES/WARNINGS/ADVISORIES

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