964
ACUS11 KWNS 060429
SWOMCD
SPC MCD 060428
NEZ000-COZ000-060630-

Mesoscale Discussion 2248
NWS Storm Prediction Center Norman OK
1128 PM CDT Sat Sep 05 2026

Areas affected...parts of northeastern Colorado...southwestern
Nebraska

Concerning...Severe potential...Watch unlikely

Valid 060428Z - 060630Z

Probability of Watch Issuance...20 percent

SUMMARY...A small, but organizing cluster of storms may continue to
pose a risk for strong to severe gusts near the I-80 corridor, while
approaching the North Platte NE vicinity through the 1-3 AM CDT time
frame.  It is not clear that this will require another severe
weather watch, but trends are being monitored.

DISCUSSION...As the initial stronger storm cluster dissipated to the
east/northeast of the Alliance NE vicinity, vigorous renewed
thunderstorm development initiated to its southwest, along a
stalling outflow boundary across the Cheyenne Ridge vicinity.  This
activity has generated a number of strong to severe wind gusts
either side of the northern Colorado/Nebraska Panhandle border over
the past hour or so, while becoming a bit better organized with a
developing embedded lower/mid-tropospheric cyclonic circulation and
at least a compact area of stronger 2-hourly surface pressure rises
on the order of 3-5 mb across the Sidney NE vicinity.

Aided by a modestly strengthening southerly nocturnal low-level jet
(20-30+ kt around 850 mb) across the high plains, vertical shear and
forcing for ascent along the outflow may continue to overcome
increasing mid-level inhibition (associated with further
boundary-layer cooling) at least another few hours.  Based on latest
objective analysis, easterly near-surface updraft inflow becomes
potentially much more unstable eastward along the I-80 corridor
toward the North Platte vicinity, where surface dew points increase
to around 70 F.

..Kerr.. 09/06/2026

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LBF...BOU...

LAT...LON   40880240 41190229 41400110 41230039 40510091 40460172
            40580260 40880240

MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN