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Mesoscale Discussion 659 |
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Mesoscale Discussion 0659
NWS Storm Prediction Center Norman OK
0534 PM CDT Fri May 02 2025
Areas affected...Central Alabama to far northwest Georgia
Concerning...Severe Thunderstorm Watch 214...216...
Valid 022234Z - 030030Z
The severe weather threat for Severe Thunderstorm Watch 214, 216
continues.
SUMMARY...A squall line moving east across central/northern Alabama
and into far northwest Georgia will continue to pose a damaging wind
threat through the early evening hours.
DISCUSSION...Regional radar mosaics show the development of a
consolidated squall line extending from northeast to central AL.
Local reflectivity and velocity data show segments of the line are
struggling to maintain a balanced updraft/downdraft convergence zone
- likely the result of weak low/mid-level shear as sampled by the
KBMX VWP - but other segments show strong low-level velocities. The
KHTX VWP recently sampled 35-50 mph winds within the lowest 1-2 km
associated with the passage of the line, and surface observations
have also recently sampled gusts between 35-40 mph. Downstream of
the line, low-level lapse rates remain near 8-8.5 C/km, which will
continue to facilitate efficient downward momentum transfer of the
stronger low-level winds. Additionally, the line is migrating into
the apex of a buoyancy ridge draped across AL with MLCAPE values
upwards of 1000-1500 J/kg. As such, the potential for damaging winds
should persist for the next few hours as the squall line progresses
east - especially where balanced updraft/downdraft convergence zones
can be maintained. In the absence of a stronger kinematic
environment, the onset of nocturnal cooling after 00/01 UTC should
result in increasing inhibition and modulate the wind threat heading
into the late evening hours.
..Moore.. 05/02/2025
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MRX...FFC...BMX...HUN...
LAT...LON 32548819 33288749 34048671 34678616 34938579 35018524
34968482 34758460 34428464 33908499 33518540 33048586
32778623 32558662 32418698 32368724 32338764 32368795
32428813 32548819
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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