Forecast Discussion
NWS Omaha/Valley, NE

642
FXUS63 KOAX 081043
AFDOAX

Area Forecast Discussion
National Weather Service Omaha/Valley NE
543 AM CDT Mon Jun 8 2026

.KEY MESSAGES...

- Warmer weather builds in Monday lasting through much of the
  week. High temps are forecast to peak higher than they have
  so far this year.

- Heat could be disrupted by stronger storms that will try to
  develop and move through the area Monday through Wednesday.

- After a scorcher of a work week, next weekend brings cooler
  temperatures.

&&

.DISCUSSION...
Issued at 1130 PM CDT Sun Jun 7 2026

Another June day lead to another evening of watching convection
over the Corn Belt. Today`s activity was spottier than the past
few nights and storms were less volatile, too. The only product
issued this evening was a flood advisory for heavy rain in
Cuming County. The vast majority of the showers are now east of
the Missouri River this evening as the mid- level cut-off low
continues to fill in and push northeast and over the ridge
axis - finally getting caught back up in the overall pattern.

With this, the mostly cloudy skies have cleared for all but
western Iowa. The cloud cover helped hold highs to near seasonal
norms today and cooler than the past few days. They fell a
considerable span short of the forecast highs of the next three
days. Some spots that managed upper-70s for maximums today may
see mid-90s by mid-week.

Tonight will be dry, but radiational cooling will allow temps to
fall to near current dewpoints. With quiet winds and subsidence
behind the departing low, patchy fog may develop. Odds are best
west of the Missouri River, but all locations may see some
reduced visibility before clearing in the morning.

.MONDAY...

After the early morning fog, some small PoPs (20%) are
warranted as a decaying MCS is progged to push into the area.
Current CAM guidance keeps things primarily dry, but these
compact systems tend to have a longer lifespan than CAMs give
them credit for.

Under party cloudy skies, high temps should be about 5 degrees
warmer than they were on Sunday.

Isolated afternoon/evening storms are possible as H5 winds
increase and bulk shear grows closer to 30 knots. Better precip
chances wait for after dark when a short-wave driven MCS again
approaches from the west around midnight. It kills this
convective complex on the western edge of the CWA... but we know
better than to put too much faith into those solutions. This
could bring a threat of hail, but mostly damaging winds. The 00z
HRRR has some 40-50 knot winds finding their way this far east.

.TUESDAY...

For many spots, Tuesday will be the hottest day of the year so
far with some triple digits possible in the typically hottest
spots. Dewpoints pushing to near 70F will leave heat indices
climbing to 105-110F. Considering this is the first real heat
wave of the year, we must caution that impacts to the human (and
animal) body tend to be higher early in the season as the body
has not grown accustomed. A "major heat risk" is forecast for
most of the area Tuesday and Wednesday. It`s worth noting that
two consecutive days of heat tend to take a greater toll than
two separate hot days would.

Confidence in the heat isn`t as high as it could be as we`re
expecting a cold front to stall just northwest of the forecast
area which adds some uncertainty. And with MCS`s in the
forecast, uncertainty climbs some more as their timing has been
known to throw a wrench in to a scorching forecast before, too.
If they were to push through the area during afternoon hours,
they could knock 10-15 degrees off a forecast maximum. Tuesday`s
probability for reaching 100F or more peaks at about 25% (NBM) in
northeast Nebraska and is near at Omaha, Lincoln, and Onawa, IA
and points west of there.

Thunderstorms are expected along the SD state line on Tuesday
night as a boundary approaches from the northwest. We could see
something develop in the warm sector in the afternoon/evening,
too.

.WEDNESDAY...

Odds for hitting 100F are very similar to those of Tuesday.

The upper trof pushing ashore out west tonight pushes through
the High Plains on Wednesday and drives the cold front through
eastern Nebraska on Wednesday afternoon. Models have been
trending faster with this feature, which has pushed the threat
of severe weather farther east as a result. Best chances now
will be across Iowa. Expect storms to begin up north before
building south along the trailing front. High temps in Iowa may
outpace those of the day before while communities farther west
may begin the forecast cooling spell.

.HEADING INTO THE WEEKEND...

That front is progged to stall out and vacillate back and forth
across Missouri and Iowa. This feature will help produce an
opportunity for showers and storms on a regular basis. We`ll
remain in the "cool" sector of system. Highs for Thursday
through Saturday will be in the 80s. Sunday may be cooler yet.

With continued northwestern H5 flow, regular opportunities for
showers and storms continues through the 7-day as any little
ripple in the jet will kick up some convection.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 534 AM CDT Mon Jun 8 2026

MVFR and IFR ceilings and visibilities will prevail through the
early morning, before improving to VFR by around 15Z. A few
isolated showers and storms may develop Monday afternoon, with a
second round of storms moving across southeast Nebraska
overnight. Confidence in exactly where or when these storms
might develop remains too low to include a mention at this time.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.

&&

$$

DISCUSSION...Nicolaisen
AVIATION...KG

NWS OAX Office Area Forecast Discussion

Forecast Discussion
NWS Hastings, NE

065
FXUS63 KGID 081033
AFDGID

Area Forecast Discussion
National Weather Service Hastings NE
533 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 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 /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 1235 AM CDT Mon Jun 8 2026

For KGRI/KEAR Airports:

Southeast winds are expected through 12z then winds will switch
to the northeast by 15z. Winds will increase out of the north
around 18z to around 15 knots. Winds will weaken and range from
the east to northeast between 00z and 06z Tuesday. Showers and
thunderstorms are possible between 13z-16z but confidence is low.
Low ceilings/fog are possible from around 09z to 15z but the
density of the fog and ceiling height are uncertain at this
time.

&&

.GID WATCHES/WARNINGS/ADVISORIES...
NE...None.
KS...None.

&&

$$

UPDATE...
DISCUSSION...Stump
AVIATION...Schuldt

NWS GID Office Area Forecast Discussion