Mesoscale Discussion 0357
NWS Storm Prediction Center Norman OK
0152 AM CDT Sat Apr 10 2021
Areas affected...Southern Mississippi...Southern Alabama...Western
Concerning...Tornado Watch 87...
Valid 100652Z - 100845Z
The severe weather threat for Tornado Watch 87 continues.
SUMMARY...A severe threat is expected to develop across southern
Alabama and the western Florida Panhandle later tonight. Wind
damage, a few tornadoes and isolated large hail will be possible.
Weather watch issuance will likely be needed.
DISCUSSION...The latest radar imagery shows a linear MCS across
southeastern Mississippi extending into north-central Alabama. The
line is being supported by a 40 to 50 kt low-level jet. Ahead of
this line of severe storms, surface dewpoints are in the mid to
upper 60s F across southwest Alabama and the far western Florida
Panhandle, where the RAP is analyzing moderate instability. The line
should be maintained as the low-level jet strengthens, and as the
storms move eastward along the northern edge of moderate
instability. Discrete thunderstorms are also expected to move from
the northern Gulf of Mexico into the coastal areas of Alabama and
the far western Florida Panhandle over the next couple of hours.=20
The Mobile, Alabama WSR-88D VWP shows 0-6 km near 65 kt with storm
relative helicity just above 400 m2/s2. This will be favorable for
supercells with a tornado threat. Tornadoes will be possible with
discrete cells that move onshore ahead of the line, and with
rotating elements with the squall line itself. Widespread wind
damage will also be possible along the leading edge of the squall
line. Weather watch issuance will likely be needed to the east of WW
87 in the next 1 to 2 hours.
= = =
To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at email@example.com and ask to be removed from WX-STORM. ------------=_1618037611-18854-10302--