ACUS01 KWNS 091300
SWODY1
SPC AC 091259

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 AM CDT Tue Jun 09 2026

Valid 091300Z - 101200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE
NORTHERN AND CENTRAL PLAINS...

...SUMMARY...
Numerous severe thunderstorms with a potential for 60-80 mph winds
with locally higher gusts, along with tornadoes (some potentially
strong), and large to very large hail are expected across the
northern and central Plains this afternoon and tonight. Severe wind
gusts and large hail will also be possible from north-central and
west-central Kansas southwestward into the Texas Panhandle.

...Central and Northern Plains...

A prominent upper trough will shift east-northeastward from the
northern Rockies toward the northern High Plains and Canadian
Prairies through tonight, with height falls overspreading much of
the northern/central Plains toward the Upper Midwest. This will be
atop a moist airmass near/east of a dryline/front located from far
western North Dakota southward into western Nebraska. Warm sector
surface dewpoints will be in the upper 60s and lower 70s F.

Thunderstorms are expected to form near the front/dryline by
mid/late afternoon, initially spanning the west-central Dakotas
southward into western Nebraska. Some semi-discrete storms including
supercells may also form farther east within the warm sector,
enhanced as the mid-level jet phases with a significantly
strengthening low-level jet primarily focused across eastern North
Dakota/northeast South Dakota. Aside from large hail, a few
tornadoes are expected, some of which could be strong especially
during the early/mid-afternoon hours. Over time and farther west,
strong low-level convergence near the instability axis will result
in a relatively rapid transition to linear mode with multiple linear
clusters/possible MCS expected to develop by evening. The severe MCS
will move eastward across the central and eastern Dakotas, with
damaging wind and some hail/tornado potential continuing eastward
tonight toward Minnesota/part of Iowa.

Aside from North Dakota/northern South Dakota and northwest
Minnesota, another supercell/tornado-favorable zone could
materialize by evening farther southeast from southeast South Dakota
into eastern Nebraska and western Iowa/southwest Minnesota.
Mid-level temperatures will be a bit warmer and storm
coverage/certainty will likely be lesser across this region.
However, a rather favorable and potentially volatile environment
will exist as a secondary low-level jet branch increases and
interfaces with an effective warm frontal zone this evening, with
initial intense supercells plausible if/where storms develop.

...Western and central Kansas and Texas and Oklahoma Panhandles...

Higher-based storms are expected to develop regionally by late
afternoon/early evening with moderate buoyancy and very steep lapse
rates favorable for large hail and severe-caliber wind gusts, some
of which could be significant.

...Middle Mississippi Valley/Lower Ohio Valley...

As a byproduct of several decayed MCS, multiple MCVs will are
expected to drift east-southeastward across the region today and
interface with a moist/unstable environment influenced by outflow
and differential heating. A rejuvenated round of severe storms is
expected by mid/late afternoon, and some supercells are plausible if
MCV-related mid-level flow diurnally persists. Multicells capable of
damaging winds are the most probable hazard, but some
supercell-related tornado potential may also exist.

..Guyer/Wendt.. 06/09/2026

$$
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