Chadron, Nebraska 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

158
FXUS65 KCYS 300822
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
222 AM MDT Thu Jul 30 2026

.KEY MESSAGES...

- Monsoon moisture will remain in place through the end of the
  week across the high plains.

- More heat returns this weekend through Monday, with some near
  record high temperatures possible along with drier conditions.

- Some relief of the heat possible during the middle of next
  week as a Canadian cold front moves towards the Front Range.

&&

.SHORT TERM /THROUGH SATURDAY/...
Issued at 215 AM MDT Thu Jul 30 2026

Current radar mosaic across the northern Front Range shows scattered
light showers over the mountains and east central Wyoming plains
at this hour with the evening thunderstorm activity moving
further east over the central plains. Lightning detection hasn`t
picked up any CG at this time with only isolated embedded thunder
expected over the next few hours. This activity is in response
to an upper level shortwave and 65 knot jet max, which is expected
to drift southeast across southeast Wyoming and western Nebraska
for Thursday. Tricky forecast this afternoon and evening with
some high res models showing a decent chance of a few severe
thunderstorms, while other guidance shows mainly dry conditions
over much of the area. Synoptic models continue to show the upper
level ridge axis rebuilding over Utah, western Colorado, and
western Wyoming today. This ridge and the upper level jet max
will provide some drier air to the forecast area, but mainly
across central and south central Wyoming...including Carbon and
Albany counties. Further east, not as confident that this dry
air will make it as far east as the Nebraska/Wyoming
border...nor the I-25 corridor to a lesser extent. Models tend
to dry things out too quick this time of the year when it comes
to monsoon patterns, and today will be no different. Convective
parameters still look good, especially east of I-25, with MLCAPE
between 1500 to 2000 j/kg for Sidney, Scottsbluff, and Chadron.
Shear is also better compared to the last several days as the
jet max moves overhead...with 0-6km shear up to 40 knots later
in the day. There is definitely a conditional risk for severe
thunderstorms today, so agree with SPC Marginal Risk for the
eastern plains. However, forcing is limited outside of east
central Wyoming and the northern/central Nebraska Panhandle as
most of the forecast area is south of the upper level shortwave,
or not under the favorable quadrant of the upper level jet max.
Any storms that do develop may contain large hail and strong
gusty winds. Also, can`t rule out a storm or two overachieving
today in these conditions...but confidence is low at this time.
Slightly warmer temperatures today with highs in the upper 80s
to middle 90s, warmest over the western Nebraska Panhandle.

For Friday, models show the upper level flow becoming more northerly
as the upper level ridge axis builds northward and amplifies through
the day. All models indicate a potent upper level shortwave digging
southeast. In addition, nocturnal convection/MCS activity across
the Great Plains expected to produce considerable northeast to
easterly outflow as a surface cool front moves into the Laramie
Range and stalls. This feature will result in enhanced surface
convergence along and east of the I-25 corridor. Another 65-70
knot jet max is forecast to lift northeast across the Colorado/Wyoming
border, with increasing upper level diffluence. Expected thunderstorm
coverage to increase Friday afternoon and evening, mainly from
Douglas to Laramie and Lusk to Kimball Nebraska. At this time,
0-6km shear looks to be on the marginal to on the low side, so
will keep strong to severe wording out of the forecast for
now...but will continue to monitor this trend over the next 24
hours. Current trend has shifting the area of best thunderstorm
develop further west...to include Albany County.

For Saturday, all models show the upper level ridge axis, and
599dm upper level high centered across southern Utah, shifting
north and east through the day. Expect a drying trend through
the afternoon as the midlevel subsidence is forecast to suppress
convection initiation. After a slightly cooler Friday, Saturday
will be back to above normal temperatures with highs in the
upper 80s to upper 90s (warmest north of I-80). Kept POP below 5
percent through the evening hours.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
Issued at 211 PM MDT Wed Jul 29 2026

A ridge axis will be firmly in place for our Saturday with dam
heights above 594 decameters for a good portion of the area. This
high pressure will also suppress the monsoonal moisture flow and keep
it well to our south. The sinking and downsloping air should help
dry and heat up the afternoon atmosphere. Expect high temperatures
ranging from the mid to upper 80s in the interior basins and foot
hills to low to upper 90s north and east of the Laramie Range. Some
locations in Converse and Niobrara Counties could reach or exceed
record daily high temperatures. Another area of concern with the
excessive heat is how dry it will be. Minimum afternoon humidity
values are progged to be in the lower 20s to the low teens and
single digits for the northern and western fire zones. Winds appear
tame and are expected to preclude red flag conditions. A few
isolated storms are possible in the mountains and very southern
portions of the CWA during the afternoon hours with just enough
moisture to kick off high based thunderstorms. Would not expect
these storms to last long or produce much rainfall.

Sunday and Monday still has the ridge axis over the area. There may
be a few weak shortwave troughs that could flatten the ridge
slightly. The probability of a few more afternoon thunderstorms
could result, but chances are low and storms would be dry. The main
concern is for the excessive heat Sunday. Again temperatures soar to
the upper 90s to mid 100s for many locations. The current forecast
is for daily record highs to be broken or tied. Winds do increase
also Sunday with the increasing pressure gradients influenced by the
shortwave troughs. RH values plummet into the single digits over a
large part of the area and overnight recoveries are likely to be
poor. Therefore it is probable red flag products are issued if these
conditions hold in the forecast.

Monday evening through the rest of the forecast period has ensemble
support of a trough clipping the border and extending south through
our area. This would suppress the ridge into the deep southwest and
allow more seasonable conditions to return. Moisture remains a
scarce commodity, but perhaps there is enough along with enhanced
synoptic lift to trigger some showers and storms, especially over
the ranges. Hopefully a cold front associated with this trough can
provide some relief from the heat and increase surface humidity.

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 1045 PM MDT Wed Jul 29 2026

Current radar shows a few lingering showers across southeast Wyoming
and western Nebraska. Showers could linger for the next several
hours but are not likely to cause any major impacts. Given the
lighter winds and precipitation that fell across the area, cannot
rule out patchy fog developing for areas east of the Laramie during
the early morning hours. Low stratus will also be possible with the
low-level moisture which could lead to MVFR or IFR conditions.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.

&&

$$

SHORT TERM...TJT
LONG TERM...RV
AVIATION...SF