New MD for west-central AL...
Mesoscale Discussion 0126
NWS Storm Prediction Center Norman OK
0158 PM CST Sat Feb 23 2019
Areas affected...west-central AL
Concerning...Severe potential...Watch possible
Valid 231958Z - 232100Z
Probability of Watch Issuance...40 percent
SUMMARY...Storms are intensifying in west-central AL and at least
one has exhibited weak/transient rotation indicative of a marginal
supercell. Will monitor convective trends in the short term
regarding the need for a tornado watch before the risk of severe
weather increases later this evening.
DISCUSSION...A couple of storms have developed during the past 1-2
hours near the AL/MS border to the east of Meridian, MS and west of
Tuscaloosa, AL. The storms have developed in the warm sector and
seemingly due to both diurnal heating and within a zone of low-level
warm/moist advection. The thunderstorm activity will likely
coincide with the diurnal heating cycle and it is possible this
activity weakens with the onset of diurnal cooling. However, if 1
or 2 storms can become bootstrapped and become unequivocally
surface-based, the transition to supercell would occur and a risk
for a tornado or two may accompany these storms. This possible
scenario is highly uncertain but there is greater confidence the
severe risk will increase towards early evening as the thunderstorms
over MS move into western AL.
..Smith/Grams.. 02/23/2019
...Please see
www.spc.noaa.gov for graphic product...
ATTN...WFO...BMX...HUN...