|Mesoscale Discussion 408|
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Mesoscale Discussion 0408
NWS Storm Prediction Center Norman OK
0327 PM CDT Fri Apr 23 2021
Areas affected...parts of western north-central TX and far
Concerning...Tornado Watch 100...
Valid 232027Z - 232230Z
The severe weather threat for Tornado Watch 100 continues.
SUMMARY...A mesoscale area most favorable for a tornadic supercell
will be near the adjacent portions of southwest OK/northwest TX
during the 5-7 pm period. Large to giant hail is possible.
DISCUSSION...Latest subjective surface mesoanalysis places a moist
axis east of the dryline and extending from near Seymour and
protruding north-northwest to near Childress, with lower 60s degree
F dewpoints near and south of the OK border as of 325 pm. RAP
forecast soundings show continued differential thermal advection
occurring during the next few hours with 500 mb temperatures cooling
from -16 deg C to -18 across this region. Additional heating and
low-level moistening will contribute to a very unstable airmass
within this confined mesoscale corridor (2500-3000 J/kg MLCAPE).
Some low-level backing of surface winds is expected which will
contribute to enlarging the hodograph during the 5-7 pm period. If
an established quasi-discrete supercell manages to develop
(increasingly probable at this point), a tornado risk may accompany
it for an hour or so. Large to giant hail (1 to 3.5 inches in
diameter) may also occur with the discrete surface-based updrafts.
Further storm development and consolidation of cold pools into a
cluster by early evening will likely diminish the supercell-tornado
risk towards sunset.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 33569969 34179994 34450025 34759999 34459925 34049879
33699885 33459921 33569969
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