SPC Jul 3, 2026 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1253 AM CDT Fri Jul 03 2026

Valid 031200Z - 041200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL
NEBRASKA INTO WESTERN IOWA...

...SUMMARY...
Scattered wind damage and large hail are expected from parts of
Nebraska into Iowa Friday. Isolated to scattered severe storms are
also possible extending eastward from the northern/central Plains
into the Midwest, Tennessee Valley, and Mid-Atlantic.

...Synopsis...
The flow across the central US will modify today, becoming more
zonal as height rises begin across the southern Rockies. Upper-level
ridging will continue across the eastern US. A surface front will
extend across the northern High Plains into the Midwest and Upper
Great Lakes. Several clusters of thunderstorms are expected to
develop in the vicinity of this boundary. Additional scattered
thunderstorms will be possible across portions of the Northeast to
the Mid-Atlantic and across the Tennessee Valley and northern
Georgia.

...Northern/Central Plains...
Modest westerly flow will remain across the northern/central Plains
this afternoon, with a shortwave trough rotating through the flow
across the Dakotas into Minnesota by the evening. Scattered
thunderstorm activity is expected along and near a surface boundary
extending from the western Dakotas into the Upper Midwest. A
reservoir of moderate to strong instability will remain amid a plume
of steep low to mid-level lapse rates. Initially, a few supercells
are likely, particularly near the Black Hills in South Dakota and
across the central Dakotas. Deep layer shear around 30-40 kts and
aforementioned steep lapse rates will support potential for large to
very large hail. Eventual upscale growth into one or more bowing
clusters is expected towards the evening, especially as forcing for
ascent increases with the shortwave and increasing low-level jet in
the evening. Potential will also increase for a few significant
gusts 75+ mph, particularly across northeastern Nebraska into
western Iowa.

Additional isolated supercell development will be possible near the
surface trough and dry line from western Kansas into the
Oklahoma/Texas Panhandle. Forcing will be weaker in this region, but
a few instances of large hail and severe wind will be possible.

...Midwest to the Lower Great Lakes and portions of the
Northeast/Mid Atlantic...
Widely scattered thunderstorm activity will be possible across the
Midwest into the Great Lakes/Upper Ohio Valley in the vicinity of
residual outflow from overnight activity. Deep layer shear/flow will
be relatively weak but a moderately unstable and moist air mass will
support potential for a few clusters which produce swaths of
damaging wind.

A corridor of more favorable mid-level flow around 40-50 kts will
exist along the periphery of the ridge across the Northeast to the
northern Mid-Atlantic. Deep layer shear around 30-40 kts may support
one or more organized clusters with damaging wind potential into the
afternoon/early evening.

...TN Valley and northern GA...
Widely scattered thunderstorm activity is expected across portions
of the Tennessee Valley into northern Georgia this afternoon. Flow
across the region will be negligible but a very moist and unstable
air mass amid steep low to mid-level lapse rates will support
potential for wet downbursts.

..Thornton/Moore.. 07/03/2026


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SPC Jul 3, 2026 0100 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 0100Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0745 PM CDT Thu Jul 02 2026

Valid 030100Z - 031200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS FAR
EASTERN SOUTH DAKOTA INTO FAR SOUTHWEST MINNESOTA AND EXTREME
NORTHWEST IOWA...

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
THE NORTHERN HIGH PLAINS TO THE GREAT LAKES AND WESTERN KANSAS...

...SUMMARY...
Scattered severe storms are still possible from the northern Plains
into the Midwest and Great Lakes regions this evening. More isolated
severe storms will be possible across the Central High Plains.

...High Plains into the Midwest...
Several clusters of thunderstorms are ongoing across portions of the
Dakotas into northern Iowa and southern Wisconsin/northern Illinois.
Across the western Dakotas, clusters of multi-cell and supercells
are ongoing. Given moderate instability and some supercellular
modes, large hail to very large hail and damaging wind will continue
to be a threat through the evening. Additional thunderstorms may
move out of Montana and or southern Canada through the evening with
additional chances for large hail and damaging wind.

A cluster across southeastern South Dakota moving into
Minnesota/Iowa has a history of producing significant gusts 90-100
mph. More recent observations have been around 60-70 mph. It is
likely that the damaging wind potential will continue downstream for
the next couple of hours, with potential for additional development
along the trailing outflow into northern Nebraska later this
evening. The 00z sounding from OAX sampled a large cape profile with
steep low to mid-level lapse rates.Confidence in exact evolution
remains low but some CAM guidance does suggest a secondary MCS
structure may move eastward later this evening across northern Iowa.
Given the large MLCAPE gradient extending across southern South
Dakota into northern Iowa and a continued reservoir of steep low to
mid-level lapse rates, this may pose additional potential for
damaging wind through the evening.

...Central High Plains...
A few isolated supercells are ongoing across portions of eastern
Colorado, southern Nebraska, and western Kansas. These have had
occasional stronger MESH cores around 2 inches. The 00z sounding
from DDC sampled strong instability and steep low to mid-level lapse
rates amid large dew point depressions within the near surface
profile. Given strong deep layer shear, inverted v soundings, and
moderate to strong instability, these supercells will continue to
pose a risk for large to very large hail and severe wind.

...Northeast...
A line of thunderstorms is sagging southward out of Quebec. These
may pose some potential for a few instances of strong to severe wind
through the evening. See MCD#1455 for more information.

..Thornton.. 07/03/2026


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SPC Jul 2, 2026 1630 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1630Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1124 AM CDT Thu Jul 02 2026

Valid 021630Z - 031200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING ACROSS PARTS OF EASTERN SOUTH DAKOTA...SOUTHWEST
MINNESOTA...AND NORTHWEST IOWA....

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE DAKOTAS
INTO THE WESTERN GREAT LAKES...OVER THE SOUTHERN APPALACHIANS AND
TENNESSEE VALLEY...AND OVER WESTERN KANSAS...

...SUMMARY...
Scattered severe storms will be possible from the northern Plains
into the Midwest and Great Lakes regions today into tonight, as well
as across the southern Appalachians and Tennessee Valley this
afternoon and early evening.

...SD to WI...
Morning water vapor imagery shows several weak and/or convectively
induced shortwave troughs moving across the northern Plains into the
Upper Midwest. This area will have widespread marginal to moderate
afternoon CAPE and dewpoints in the 60s to lower 70s. This leads to
a forecast of a large area of potential thunderstorm development,
but with weak/nebulous forcing and general height-rises aloft. As
such, the overall confidence in this forecast is not very high.

Storms are likely to focus along a boundary currently evident from
southern SD into central IA. Convection currently developing in
northern IA near the boundary should continue to intensify through
the afternoon and track into southern WI/northern IL with a severe
wind/hail threat.

Other intense thunderstorm clusters are expected to develop along
the SD/NE portion of the boundary by mid/late afternoon, also with a
risk of large hail and damaging wind gusts.

...Western KS...
Full sunshine and dewpoints in the 60s will lead to a region of
strong instability over western KS this afternoon. Most CAM
solutions suggest at least isolated thunderstorms form along the
KS/CO border and spread slowly eastward during the evening. A
deeply mixed boundary layer and sufficient CAPE suggest a risk of
damaging wind gusts in the strongest cells.

...TN Valley/Southern Appalachians...
A widespread very moist and unstable air mass is present today
across this region, with full sunshine leading to steep low-level
lapse rates and MLCAPE values over 4000 J/kg. Weak forcing under an
upper ridge limits confidence in timing/location of storms.
However, widely scattered thunderstorm development should eventually
result in merging outflows and the risk of gusty/damaging winds this
afternoon and early evening across the region.

..Hart/Halbert.. 07/02/2026


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SPC Jul 2, 2026 1300 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1300Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0743 AM CDT Thu Jul 02 2026

Valid 021300Z - 031200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
THE UPPER MIDWEST...

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE DAKOTAS
INTO THE WESTERN GREAT LAKES AND OVER THE SOUTHERN APPALACHIANS AND
TENNESSEE VALLEY...

...SUMMARY...
Scattered to numerous severe storms will be possible from the
northern Plains into the Midwest and Great Lakes regions today into
tonight, as well as across the southern Appalachians and Tennessee
Valley this afternoon and early evening.

...Northern High Plains into the Great Lakes and Midwest...
A belt of moderate southwesterly flow will extend across the
north-central states through the period. A few ongoing clusters of
showers/thunderstorms extend along residual outflow from WI to along
the MN-IA border vicinity. Farther west, a weak low analyzed near
the Black Hills and associated lee trough will aid in maintaining
southerly flow to the south of a residual frontal zone draped over
SD east-northeastward to near Lake Superior.

Some isolated severe risk may continue this morning with a small
cluster along the Dakotas border primarily to the north of the
front. Heating of a seasonably moist airmass (60s deg F north and
70s across eastern NE into IA) will contribute to moderate to strong
instability by late afternoon. Afternoon thunderstorm development
is expected near the surface low and in the vicinity of the surface
boundary/residual outflow across the Dakotas. Forecast model data
indicates deep-layer shear around 40-45 kts which will support
initial supercells capable of large to very large hail and severe
gusts. As additional storms develop and cold pools merge and result
in a few clusters evolving with time, the wind threat will likely
increase with stronger gusts associated with bowing segments. This
activity will likely persist well into the evening with some
lingering severe potentially into the overnight over the MN-IA
vicinity late.

...Southern Appalachians into the Tennessee/Ohio Valleys...
A seasonably moist boundary layer is evident in surface observations
(lower 70s F surface dewpoints) this morning. Relatively cool
500-mb temperatures around -9 deg C (reference the 12 UTC Nashville,
TN raob) and strong heating will result in fairly steep lapse rates
across this region by early to mid afternoon. Scattered
thunderstorms are likely and a few stronger clusters will probably
evolve within a weak easterly flow regime to the southwest of an
mid-level anticyclone centered over southwest VA. The steepened 0-2
km lapse rates and high PW (1.5-1.75 inches) will support wet
microbursts capable of strong to severe gusts (locally 60-70 mph)
with the more intense water-loaded downdrafts. Modifying the
Nashville raob for forecast afternoon high temperatures in the upper
90s deg F yields extreme MLCAPE (4000+ J/kg). Due to the magnitude
of buoyancy, have highlighted higher probabilities to account for
increased confidence in a wet microburst threat. Isolated hail may
also accompany the more intense updrafts. This activity will
probably coalesce into a few clusters that gradually weaken during
the evening as the wind-damage threat subsides.

...Central High Plains...
Isolated thunderstorms are expected to develop within the lee trough
across the central High Plains this afternoon. Moderate instability
overlapping with around 25-30 kts of deep-layer shear will support
potential for a mix of supercells and multicell clusters. Steep
low- to mid-level lapse rates and large temperature/dew point
spreads will support potential for severe gusts. Initial supercells
will pose potential for large hail.

...Northeast...
Northeasterly flow within the northern periphery of the eastern
ridge will allow for thunderstorm activity to track southward out of
Quebec/Ontario across portions of the Northeast this afternoon.
Uncertainty remains regarding details of convective evolution and
potential corridors of greater threat. Nonetheless, moderate to
strong instability and 30-40 kt of deep-layer shear will support
storm organization, with damaging gusts being the primary hazard
with the stronger storms.

..Smith/Dean.. 07/02/2026


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