Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 211828
SWOMCD
SPC MCD 211828
MSZ000-LAZ000-TXZ000-212000-

Mesoscale Discussion 0081
NWS Storm Prediction Center Norman OK
1228 PM CST Wed Feb 21 2018

Areas affected...Southern/Central/Northeast LA...Far Southeast TX

Concerning...Tornado Watch 3...

Valid 211828Z - 212000Z

The severe weather threat for Tornado Watch 3 continues.

SUMMARY...Conditions remain favorable for transient/brief tornadoes
across southern/central/northeast LA.

DISCUSSION...Convective cluster, with embedded supercells, continues
to move northeastward across central LA into northeast LA. Rotation
of varying strength has been observed within the supercells over the
past hour with both constructive and destructive storm interactions
noted. Wind fields, sampled well by the KPOE and KLCH VAD wind
profiles, continue to show support (particularly in the lowest 3 km)
for enough low-level updraft rotation to sustain a tornado threat.
Very little change has been noted in the thermodynamic fields over
the past hour, with the exception of northwest/north-central LA
where the cold front has moved through. Consequently, overall
conditions remain favorable for transient/brief tornadoes within the
cluster moving across central LA as well as the newly developed line
of storms approaching the central/southern TX/LA border.

..Mosier.. 02/21/2018

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

ATTN...WFO...JAN...LIX...LCH...SHV...HGX...

LAT...LON   32189303 32459203 32419097 31749125 29939243 29659270
            29629369 29769429 30289453 30839430 31509382 32189303




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