ACUS11 KWNS 210426
SWOMCD
SPC MCD 210425
GAZ000-ALZ000-210630-

Mesoscale Discussion 0917
NWS Storm Prediction Center Norman OK
1125 PM CDT Tue May 20 2025

Areas affected...North-central Alabama...Northern Georgia

Concerning...Tornado Watch 308...309...

Valid 210425Z - 210630Z

The severe weather threat for Tornado Watch 308, 309 continues.

SUMMARY...A severe threat may continue for a couple more hours
across north-central Alabama and northern Georgia. An isolated
tornado threat, along with a potential for hail and severe wind
gusts will continue.

DISCUSSION...The latest mosaic radar imagery shows a broken line
segment with multiple embedded supercells over parts of northern
Georgia and north-central Alabama. A moist but weakly unstable
airmass is located to the southeast of the line. Across this
airmass, surface dewpoints are in the mid to upper 60s F, and the
RAP has MLCAPE from 500 to 1000 J/kg. In addition, the WSR-88D VWP
near Atlanta has 0-6 km shear near 60 knots, and 0-3 km
storm-relative helicity near 370 m2/s2. This will support an
isolated tornado threat over the next couple of hours, with the
strongest of supercells. Recently, a transition to more linear
structure has occurred with many of the cells. As this transition
continues to occur, isolated wind damage will be possible with the
more organized line segments.

..Broyles/Gleason.. 05/21/2025

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...FFC...BMX...

LAT...LON   33708666 34218527 34568440 34498395 34278391 34028407
            33858431 33328563 33028656 32748742 32768782 32918796
            33068796 33248772 33708666

MOST PROBABLE PEAK TORNADO INTENSITY...100-130 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN