|Mesoscale Discussion 798|
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Mesoscale Discussion 0798
NWS Storm Prediction Center Norman OK
0741 AM CDT Sat May 20 2017
Areas affected...Southern Texas
Concerning...Severe potential...Watch possible
Valid 201241Z - 201415Z
Probability of Watch Issuance...40 percent
SUMMARY...At least isolated severe hail and wind are expected
DISCUSSION...A small complex of thunderstorms continues to redevelop
along a slow moving front/outflow boundary west and northwest of the
San Antonio area. Several of these storms have contained hail, but
few have remained very long-lived as they have been progressively
undercut by outflow. Recently a small line segment has materialized,
suggesting a bit more outflow surge.
A very moist and unstable air mass is in place across the region,
and daytime heating will lead to further destabilization and also
increased storm propagation. Morning soundings also show relatively
long hodographs owing to good mid to upper level flow, however,
winds in the lower part of the troposphere are relatively weak,
though veering with height.
Daytime heating should allow for a gradual increase in storm
coverage and intensity as they progress east/southeastward across
south TX. Large hail and damaging winds will be possible, and a
watch may be needed later this morning as these storms evolve.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 30019954 30189851 30159822 29839715 29429677 28879624
28439621 28049648 27759701 27729750 27999826 28629920
29059957 29199977 29369984 29609983 29819970 30019954
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