ACUS03 KWNS 160737
SWODY3
SPC AC 160736

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0236 AM CDT Sat May 16 2026

Valid 181200Z - 191200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS PORTIONS OF THE SOUTHERN/CENTRAL PLAINS INTO THE MIDWEST...

...SUMMARY...
Numerous strong thunderstorms are expected to develop Monday along a
cold front and dryline extending from the Great Lakes into the
central/southern Plains. Supercells capable of all hazards
(including very large hail and strong to intense tornadoes) will be
possible across central Kansas into southeastern Nebraska.

...Synopsis...
On Monday, the western trough will take on a negative tilt before
ejecting across the central Plains, with strong southwesterly flow
aloft overspreading the region. As a result, a strong surface low
will development across western Kansas. A surface cold front will
extend northward to a secondary surface low across the upper
Midwest. A dryline will extend southward across portions of western
Kansas into western Oklahoma. Numerous thunderstorms are expected to
develop along and ahead of the cold front and further south along
the dryline Monday afternoon and evening from Nebraska into central Kansas.

...Central Kansas into southeastern Nebraska...

A volatile environment is expected to be in place ahead of the
dryline across central Kansas Monday afternoon, with moderate to
strong instability, strong deep layer shear, and steep low to
mid-level lapse rates. This will favor supercells as the primary
mode with developing thunderstorms along the dryline in the
afternoon, with potential for large to very large hail (some 2-4
inch). Through the afternoon and evening, a 40-50 kt southerly low
level jet will shift into central Kansas with large clockwise
enhancement of low-level hodographs. Should the mode be able to
remain discrete supercells, strong to intense tornadoes will be
possible across central Kansas into southeastern Nebraska. This in
combination with potential for very large hail may warrant higher
probabilities as mesoscale details become clearer.

As the front shifts southward through time, upscale growth will be
favored with increasing probabilities for damaging winds.

...Iowa into Wisconsin and the Great Lakes Region...

Widely scattered thunderstorm development is expected further north
along the front into Iowa/Wisconsin and north into the Great Lakes
Region. Early day convection may be ongoing at the start of the
period within these regions, which may limit how much
destabilization can occur before the afternoon. Nonetheless,
guidance suggests potential for damaging wind and perhaps a few
instances of severe hail with storms along the front Monday
afternoon and evening.

...Western Oklahoma into northern Texas...

Forcing for ascent will be weaker across the dryline into western
Oklahoma and northern Texas. Guidance does suggest that a few
isolated supercells could develop near the dryline, with potential
for large to very large hail, damaging winds, and perhaps a tornado.
Given the strong flow aloft and better large scale ascent will
reside further north in Kansas, mode may quickly become messy with
uncertainty in overall coverage at this time.

..Thornton.. 05/16/2026

$$
--- SBBSecho 3.28-Linux
* Origin: Capitol City Online (618:250/10)

ACUS03 KWNS 070723
SWODY3
SPC AC 070722

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0222 AM CDT Sun Jun 07 2026

Valid 091200Z - 101200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER CENTRAL
NORTH DAKOTA AND NORTH-CENTRAL SOUTH DAKOTA...

...SUMMARY...
Scattered to numerous severe thunderstorms are expected to develop
across portions of the northern Plains into Upper Mississippi Valley
Tuesday afternoon into night. All severe-weather hazards are
possible. Isolated to widely scattered severe storms may also occur
across the central Plains, with a risk for large hail and damaging winds.

...Synopsis...

A short-wave trough and attending mid/upper-level jet streaks over
the northern Rockies Tuesday morning will overspread the northern
Plains by afternoon. Farther upstream, a significant short-wave
trough will assume an increasing negative tilt while translating
into the northern High Plains early Tuesday morning. At the surface,
a cyclone linked with the lead short-wave trough will deepen while
developing from southeast MT into western ND by afternoon.
Meanwhile, an associated Pacific front will push east into the
western Dakotas, with more of a dryline structure evident from
southwest NE into the OK and TX Panhandles.

...Northern and Central Plains into Upper Mississippi Valley...

An active severe-weather period is anticipated Tuesday afternoon
into night, especially across the northern Plains, where all
severe-weather hazards are possible.

While the pre-frontal air mass over the western Dakotas is not
expected to be overly moist with dewpoints in the 50s to low 60s,
strong daytime heating and steep mid-level lapse rates will
contribute to moderate to strong instability by mid to late
afternoon. Some potential for early-day storms will exist in
northern ND, within a zone of persistent warm advection. Additional,
more intense thunderstorm activity is expected by mid afternoon from
the southern fringe of the early-day convection south along the
front as forcing for ascent increases with the approach of the
short-wave trough.

Vertically veering wind profiles with 40-50+ kt of deep-layer shear
will favor supercells capable of large to very large hail initially.
Some tornado threat could materialize during the evening hours as
LCL heights lower and the low-level shear increases. With time,
storms may grow upscale into clusters, with an increasing risk for
damaging winds spreading east through the Red River Valley.

Farther south, a number of models develop isolated to widely
scattered storms during the afternoon along the dryline in western
KS amidst a marginally sheared, but moderate to strongly unstable
environment. There is some signal that an MCS could evolve from that
activity across the mid to lower MO Valley Tuesday evening. Only 5% total-severe probabilities will be added in those areas, due to
uncertainty in that scenario.

..Mead.. 06/07/2026

$$
--- SBBSecho 3.28-Linux
* Origin: Capitol City Online (618:250/10)

ACUS03 KWNS 080723
SWODY3
SPC AC 080722

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0222 AM CDT Mon Jun 08 2026

Valid 101200Z - 111200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF EASTERN MINNESOTA...MUCH OF WISCONSIN...CENTRAL AND EASTERN
IOWA...AND NORTHWEST ILLINOIS...

...SUMMARY...
Scattered to numerous severe thunderstorms capable of large to very
large hail, tornadoes, and damaging winds with significant gusts
appear likely across portions of the upper Mississippi Valley and
Midwest Wednesday afternoon into night. More sporadic occurrences of
large hail and damaging winds are possible into the central Plains.

...Synopsis...

The 00z models have trended toward a similarly timed, but slightly
more amplified short-wave trough, which will move through the
northern Plains into upper MS Valley, in tandem with a 50-60+ kt jet
streak. Meanwhile, a stronger upstream system is forecast to amplify
across the northern and central Plains late Wednesday night into
Thursday morning.

At the surface, a cold front initially from the eastern Dakotas into
central High Plains will push east into the upper Great Lakes. A
frontal wave is forecast to develop from eastern SD into central MN
by afternoon, where it may link with an outflow boundary extending
into central WI. The trailing extension of the front is expected to
stall across the mid or lower MO Valley in response to the deepening
of a surface low over the central or southern High Plains.

...Upper Mississippi Valley into upper Great Lakes and mid/lower
Missouri Valley...

A very moist boundary layer, characterized by boundary-layer
dewpoints in the upper 60s to mid 70s is forecast ahead of the
front, which coupled with steep lapse rates, will contribute to
moderate to strong instability by afternoon. Thunderstorms are
expected to develop by early afternoon along the surface front and
any outflow boundaries across the upper MS Valley, with subsequent, south/southwestward storm development into IA and the lower MO
Valley by mid to late afternoon. The strongest deep-layer shear is
forecast across the upper MS Valley into upper Midwest, with
decreasing bulk-shear magnitudes with southward extent being offset
by stronger instability. The CAPE/shear parameter space will favor
organized storm modes including supercells and bowing structures.
Large to very large hail will likely be the initial hazard, with the
threat for damaging winds and tornadoes increasing as storms move
into WI, eastern IA, and northwest IL, where stronger low-level
shear is forecast.

Additional, isolated to widely scattered storms are anticipated by
late afternoon into evening across portions of the lower MO Valley
into at least eastern KS. While vertical shear will be somewhat
marginal, the strong instability will support strong up/downdrafts
capable of isolated occurrences of large hail and damaging winds.

A separate, elevated thunderstorm regime may materialize Wednesday
night into Thursday morning across portions central/eastern NE and
northern KS as low-level warm advection increases ahead of the next
mid-level trough moving into the northern and central Plains. The
strongest storms will be capable of a large-hail threat.

..Mead.. 06/08/2026

$$
--- SBBSecho 3.28-Linux
* Origin: Capitol City Online (618:250/10)

ACUS03 KWNS 090727
SWODY3
SPC AC 090726

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0226 AM CDT Tue Jun 09 2026

Valid 111200Z - 121200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST
MISSOURI THROUGH EASTERN IOWA...NORTHERN AND CENTRAL ILLINOIS AND
SOUTHERN WISCONSIN INTO WESTERN LOWER MICHIGAN...

...SUMMARY...
Scattered to numerous severe storms capable of potentially strong
tornadoes, large hail, and destructive winds appear likely from
portions of the lower Missouri and mid Mississippi Valleys into the
upper Great Lakes. More sporadic occurrences of damaging wind and
large hail are possible across the southern Plains, upper Ohio
Valley and lower Great Lakes toward the Mid-Atlantic Coast.

...Synopsis...

A potent short-wave trough initially over the central High Plains
Thursday morning is forecast to accelerate through the upper Great
Lakes with a trailing perturbation moving through the central Plains
into mid MS Valley Thursday night. Both disturbances will be located
on the cyclonic aside of an unseasonably strong mid-level jet with
500-mb wind speeds approaching 70-80 kt. The 00z models have slowed
the progression of the mid-level wave, as well as the associated
surface low, which is forecast to develop from northeast KS along
the synoptic front or remnant outflow from overnight storms into
southern WI by afternoon and northern lower MI or the UP by Thursday night.

...Lower Missouri Valley/Mid Mississippi Valley into the Upper Great Lakes...

A very moist boundary layer will combine with steep mid-level lapse
rates to yield a moderate to strongly unstable air mass by afternoon
to the south of the composite surface boundary. A cluster of mainly
elevated thunderstorms is expected to be ongoing Thursday morning
across portions of the mid MO Valley, to the northeast of the
surface low. Those storms are expected to become progressively more surface-based and intense by mid to late morning into afternoon
while rapidly moving northeast, coincident with the surface low.
Forecast sounding within the inflow environment of those storms
indicate strong low-level and deep-layer shear, supportive of
supercells and bowing segments capable of potentially strong
tornadoes, in addition to large hail and damaging winds.

Additional severe storms are expected to develop along the trailing
front from the lower MO and mid MS Valleys southwest through the
Ozarks into southern Plains. The progressive nature of the mid-level
system suggests the potential for long-tracked supercells and bowing
structures capable of tornadoes and swaths of destructive winds.

...Upper Ohio Valley and Lower Great Lakes to the Mid-Atlantic Coast...

While large-scale forcing for ascent is expected to remain
relatively weak, model guidance indicates scattered, afternoon storm development from the lee of the lower Great Lakes through the
central Appalachians to the vicinity of a lee trough in the
Mid-Atlantic. Vertical shear is expected to remain relatively weak;
however, the presence of a moist and moderately unstable air mass
will support wet microburst activity and an associated risk for
sporadic damaging winds.

..Mead.. 06/09/2026

$$
--- SBBSecho 3.28-Linux
* Origin: Capitol City Online (618:250/10)

ACUS03 KWNS 150728
SWODY3
SPC AC 150727

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0227 AM CDT Mon Jun 15 2026

Valid 171200Z - 181200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE MID-MISSISSIPPI VALLEY INTO INDIANA...

...SUMMARY...
An all-hazards severe thunderstorm episode is expected across
portions of the Middle Mississippi Valley into Indiana on Wednesday.
Intense thunderstorms may produce swaths of damaging wind, as well
as strong tornadoes and large hail.

...Midwest...

A midlevel shortwave trough is forecast to move from the northern
Plains through the Upper Midwest and Great Lakes region on
Wednesday. As this occurs, very strong deep-layer flow, especially
for this time of year, will move across portions of the Mid-MS
Valley into the Ohio Valley. A westerly 500 mb jet streak
characterized by at least 70-80 kt will overspread parts of
IA/MO/IL/IN in the afternoon and evening. Meanwhile, a 50+ kt
southwesterly 850 mb low-level jet will spread across the same area
during the afternoon/evening, just ahead of an
east/southeast-advancing surface cold front. These strong wind
fields, in conjunction with a surface low moving eastward across MN
and the Upper Great Lakes, will aid in northward transport of rich
boundary layer moisture (upper 60s to near 70 F surface dewpoints).
Cooling aloft will steepen midlevel lapse rates, and moderate to
strong destabilization is expected across the warm sector. Overall,
this pattern should support numerous severe storms. While convective
evolution remains uncertain, it is likely that at least some initial
supercell risk will unfold during the afternoon and early evening
(particularly across MO/IL), with potential for one or more bowing
MCSs developing with time. This environment will support a risk for
all severe hazards, and particularly swaths of damaging winds, and
strong tornadoes.

Some uncertainty remains regarding the northward extent of the
severe risk. Most medium range guidance indicates a lead shortwave
impulse may move across IA/IL early in the day. Coupled with strong
warm advection across the region, morning thunderstorm develop
near/north of a warm front oriented from southeast MN into northeast
IL at midday could suppress northward development of the warm front.
Likewise, the southwest extent of the risk area into portions of
KS/OK may be limited by capping concerns, and weaker forcing for
ascent. Meanwhile, the southward extent of the severe risk across
the Ohio Valley will be modulated by the stronger westerly component
of mid/upper flow overnight and slow southward movement of the
surface cold front. The risk area may shift some in coming days as
surface boundaries and other mesoscale details become better
resolved.

..Leitman.. 06/15/2026

$$
--- SBBSecho 3.28-Linux
* Origin: Capitol City Online (618:250/10)