394
FXUS63 KGID 081149
AFDGID

Area Forecast Discussion
National Weather Service Hastings NE
649 AM CDT Mon Jun 8 2026

.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.

&&

$$

UPDATE...
DISCUSSION...Stump
AVIATION...Schuldt/Thies