LIVE MAP (ABOVE) ... SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0248 PM CDT Sun Jun 14 2026
Valid 142000Z - 151200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE MIDDLE
OHIO VALLEY INTO THE NORTHEAST...AND ALONG THE SOUTHERN APPALACHIANS
INTO THE MID-ATLANTIC...
...SUMMARY...
Scattered severe thunderstorms capable of damaging wind gusts and
some hail are expected this afternoon and evening from the Upper
Ohio River Valley into the Northeast, and from the Appalachians into
the Mid-Atlantic States.
...20z...
The previous forecast remains on track with only minor adjustments
required based on recent convective trends. As of 19:30 UTC, MRMS
imagery depicts an intensifying squall line with a history of severe
gusts moving eastward across northeast OH. This section of the
squall line remains well-phased with ascent and stronger mid-level
flow associated with the shortwave trough aloft. Downstream of the
squall line, a recent 18 UTC RAOB from PIT sampled a strongly
sheared and uncapped environment that should maintain squall line
intensity through early evening and lends confidence in the ongoing
wind forecast.
Further south across the Mid-Atlantic, temperatures continue to warm
into the mid 90s with the early stages of organized convection noted
along the Appalachians and within a surface trough in north-central
NC. Regional 18 UTC soundings sampled a sufficiently buoyant and
strongly sheared environment that will likely promote further
organization and intensification through the evening hours as
convection spreads east/northeast. See MCD #1141 for regional
details and the previous discussion below for additional forecast
information.
..Moore.. 06/14/2026
.PREV DISCUSSION... /ISSUED 1131 AM CDT Sun Jun 14 2026/
...Mid/Upper Ohio Valley to the Northeast/New England...
Morning surface analysis places a low over southeastern Lower MI,
along an extensive cold front that arcs from northwestern Ontario
south-southwestward into southern IL and then more southwestward
through southern MO and central OK into the TX Permian Basin. This
cold front and attendant low are forecast to progress eastward
today, moving just ahead of a shortwave trough pivoting within the
base of a larger upper trough from the OH Valley through the
Northeast. Moderate to strong mid-level flow will accompany this
shortwave, with mesoanalysis currently estimating 60 kt at 500 mb
within the base of this shortwave over the IA/MO border.
Moderate low-level moisture is already in place ahead of this
shortwave trough and associated cold front across the OH Valley,
with upper 60s dewpoints currently observed over much of IN and OH.
Low-level moisture decreases with northeastward extent, with low 60s
dewpoints in place across much of PA and western NY, decreasing to
the upper 50s across much of New England. Filtered daytime heating
will contribute to airmass destabilization ahead of the cold front,
with temperatures in the 80s and dewpoints in the mid 60s resulting
in moderate buoyancy (i.e. MLCAPE around 800-1000 J/kg) across the
Middle to Upper OH Valley. Modest height falls and ascent along the
front will support thunderstorms within this moderately buoyant
environment. Around 40 kt effective shear could support a few
initial/semi-discrete supercells prior to more prevalent
upscale-growing linear modes, with the primary concern being
damaging wind gusts, particularly in the OH/PA border vicinity where
the best overlap of better buoyancy and shear exists. A brief
tornado and/or hail could also occur given the relative strength of
the wind profiles.
Cooler temperatures and lower dewpoints will lead to more limited
buoyancy farther northeast (i.e. from western NY into New England).
However, the airmass is still expected to destabilize, supporting
afternoon/evening thunderstorms along and ahead of the front.
Effective shear around 35 to 40 kt should be sufficient for
occasional organization and some stronger bowing segments.
...Mid-Atlantic to TN/southern Appalachians/Carolinas...
Thunderstorm development is anticipated along the modest lee
troughing expected to extend across the region this afternoon and
evening. This development is forecast to occur well ahead of the
cold front mentioned in the previous subsection, resulting in a
separate area of strong to severe thunderstorm potential from the
Carolinas into the Mid-Atlantic.
Dewpoints across the region currently range from the upper 60s
across the central MD and VA to the low 70s across the central
Carolinas. Heating of this airmass will result in moderate to strong
surface-based buoyancy. Shear will be weaker than areas farther
north but still sufficient for organized clusters and/or perhaps a
few supercells. Primary risk will be damaging gusts, with this
potential maximized from eastern PA and NJ southward through the VA
Tidewater region.
Also worth noting is the trend within the recent guidance for a
modestly organized convective line to progress from Middle
TN/northern AL through northern GA. This line appears to result from
upscale growth of a relatively higher concentration of multicells
initially over the western TN vicinity near a weak surface low.
Consistency within the guidance is high enough to extend 15% wind
probability back into middle TN/northern AL to cover this threat.
...Southern Rockies into the Southern High Plains...
Afternoon thunderstorm development is anticipated across central NM
amid persistent westerly flow aloft and modest mid-level moisture.
Deep-layer shear is strong enough to support a few organized
updrafts capable of hail with any of the early, more cellular
development. Thereafter, a trend towards a more outflow-dominant,
linear structure is anticipated, and a few damaging gusts are
possible with any stronger bowing segments.
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