316
ACUS48 KWNS 050854
SWOD48
SPC AC 050852

Day 4-8 Convective Outlook
NWS Storm Prediction Center Norman OK
0352 AM CDT Fri Jun 05 2026

Valid 081200Z - 131200Z

...DISCUSSION...
...Day4/Monday...

Ensemble mean and deterministic model solutions are in generally
good agreement in the progression of a lead short-wave trough into
central Canada, ahead of an upstream trough evolving along the West
Coast. That pattern evolution will result in rising mid-level
heights across the northern and central High Plains. At the surface,
a cold front initially from the ND-MN Red River Valley into central
High Plains will weaken through the day in response to falling
pressures over the Rockies.

A reservoir of strong instability is forecast to the south of the
decaying front across lower elevations of KS and OK into western MO.
There is some model signal for early-day storms over NE to grow
upscale into an MCS while moving through the Ozarks. Additional
diurnally enhanced storms also appear possible across the central
High Plains. The MCS scenario will be contingent on mesoscale
processes not readily evident at this time, while the High Plains
storms may be fairly isolated. As such, no area will be delineated.


...Day5/Tuesday...

The ensemble mean solutions are in relatively good agreement in the
continued amplification of the mid-level trough over the western
U.S., with strengthening southwest flow aloft overspreading the
northern High Plains. The deterministic models indicate a short-wave
trough and associated mid-level jet streak moving from the trough
base into the northern and central High Plains Tuesday night. At the
surface, there is good ensemble clustering in a deepening lee
cyclone over the northern High Plains, with that feature moving into
the Dakotas by Wednesday morning. That cyclone will be attended by a
cold or Pacific front moving out of the northern Rockies. The models
suggest that ample instability will reside ahead of the surface low
and frontal system, with the strengthening vertical shear
contributing to the potential for an organized severe-weather
episode over parts of the northern Plains Tuesday afternoon into
night.


...Day6/Wednesday...

The ensembles indicate the primary trough axis across the northern
Intermountain Region into the Sierra Nevada or Great Basin with some
indication at a lower amplitude disturbance moving through the
northern Plains. That notion is generally supported by the
deterministic models, which indicate a vorticity maximum and
associated jet streak translating through the northern and central
Plains, downstream from the primary trough axis. At the surface,
ensemble member low pressure plots indicate the northern Plains
surface low developing northeast into Manitoba with a trailing cold
front pushing east through the northern and central Plains toward
the upper MS Valley.

Model guidance is suggestive that strong instability will coincide
with more than sufficient vertical shear for supercells, with the
overall pattern indicative of a regional severe-weather event across
the eastern Dakotas into MN, and potentially into the mid MO Valley.



...Day 7/Thursday...

The ensemble mean solutions indicate broad troughing from the
Interior West into northern Plains. The deterministic solutions
begin to vary more significantly in the trough configuration;
however, all maintain strong mid-level flow from the central High
Plains into upper MS Valley. At the surface, there is larger
ensemble member spread in surface low position, though the general
consensus suggests one cyclone in southern Manitoba or northwest
Ontario and a secondary low over the central High Plains. Both lows
would be connected by a southwest-to-northeast oriented boundary.

There is some model indication that the strongest mid-level flow and
forcing for ascent will remain displaced to the west/northwest of
the effective warm sector. Given that uncertainty, no area will be
included.


...Day8/Friday...

The ensembles suggest that a low-amplitude disturbance will traverse
the north-central U.S., with upstream troughing lingering across the
Interior West. In contrast, a number of the deterministic models
indicate a relatively deep, closed low moving through the northern
Plains and upper MS Valley. In the low levels, there is considerable
spread in the position of any surface lows and associated frontal
systems, limiting confidence in the location of any severe-weather
threat.

..Mead.. 06/05/2026