Official

SPC Jun 2, 2025 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1128 AM CDT Mon Jun 02 2025

Valid 021630Z - 031200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM THE TEXAS
PANHANDLE AND NORTHWEST OKLAHOMA INTO WESTERN KANSAS...

...SUMMARY...
Scattered severe thunderstorms are likely from the Texas Panhandle
and northwest Oklahoma into western Kansas.  Severe gusts 60-75 mph
will be the primary hazard and localized gusts 75-90 mph are
possible.

...Southern High Plains into KS...
Visible-satellite imagery shows a potent mid-level shortwave trough
over AZ, which is forecast to move east-northeastward into northeast
NM this evening and south-central High Plains by daybreak.  Farther
east, a patch of stratus over the northeast TX Panhandle and western
OK is attributable to the northwest periphery of richer low-level
moisture (upper 60s surface dewpoints) per late morning analysis. 
The leading band of large-scale ascent with the Desert Southwest
disturbance is progressing eastward across central NM southward into
southwest TX, as indicated by mid- to high-level clouds and
convection.  

Strong heating will continue this afternoon ahead of the cloud
shield across the southern High Plains into eastern CO/western KS. 
Very steep 0-3 km lapse rates and moderate to very strong buoyancy
(1000-3500 J/kg MLCAPE) and eroding convective inhibition, will
favor scattered storms developing by mid afternoon on the western
part of the moist/unstable sector.  Relatively modest mid to
high-level flow will favor organized multicells.  As storm outflow
begins to congeal and as storms move eastward into an increasingly
moist airmass (PW rising from 1 inch to 1.5 inches), a propensity
for widespread thunderstorms and outflow will peak by early evening.
Forecast experience in the combination of PW, buoyancy, sufficient
shear for multicells, and high agreement in a linear storm mode, all
strongly suggest severe gusts will be the primary hazard.  Gusts
60-75 mph will be common with the stronger surges of outflow and
localized peak gusts 75-90 mph are possible.  Have upgraded to
30-percent significant wind due to confidence in intense outflow. 
CAMs show this activity spreading east across western and northern
OK and into much of central KS before weakening late this evening
into the early overnight.  

...Central High Plains to MN...
A mid-level shortwave trough is forecast to continue eastward across
MT and the northern Plains.  A surface cold front from northwest MN
southwestward into the central High Plains is forecast to focus
thunderstorms this afternoon into tonight.  Strong heating is
expected ahead of this front, where moderate destabilization will be
aided by upper 50s to mid 60s surface dewpoints.  

Initial thunderstorm development is expected during the afternoon 
across MN where the strongest low-level convergence will be in
place.  Dewpoints (and overall buoyancy) will be lower here than
areas farther southwest, which is expected to limit overall storm
strength and contribute to an anafrontal storm character.  Farther
southwest, isolated storms will probably develop by mid afternoon
over southeast WY/NE Panhandle with increasing storm coverage as
this activity moves east during the late afternoon/evening.  Strong
buoyancy will favor robust updrafts, but deep-layer shear will be
modest.  This weaker shear coupled with linear forcing is expected
to result in a quick transition to a predominantly linear mode. As a
result, some supercell threat is possible early in the convective
evolution but, storm mergers and potential clustering/line segments
favor a hail risk transitioning rather quickly to more wind.  Some
continuation of a severe threat (mainly wind) may persist late into
the evening and early overnight across NE, near the terminus of a
45-kt south-southwesterly LLJ.  

...South FL...
Shortwave trough moving over the central Gulf of America is forecast
to continue southeastward into the eastern Gulf, with increasing
large-scale ascent downstream across much of the FL Peninsula. 
Thunderstorm coverage will gradually increase through the mid
afternoon with severe/damaging gusts and large hail possible with
the stronger cores.  This activity will likely weaken by the early
evening.

..Smith/Flournoy.. 06/02/2025

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