Severe Storm Outlook Narrative (AC)
Issued by NWS
ACUS01 KWNS 180101
SPC AC 180059
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0659 PM CST Tue Jan 17 2017
Valid 180100Z - 181200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF SOUTHERN TX...
Isolated severe thunderstorms will be possible across portions of
southern Texas tonight.
...Portions of southern TX...
Thunderstorm development continues east of the Laredo area, as weak
deep ascent peripheral to a midlevel speed maximum glances a frontal
zone extending northeastward from the TX Brush Country to the Upper
TX Coast. Clusters of storms will likely evolve from this activity
within the weak warm-advection regime through the evening, and
gradually spread east-northeastward/northeastward through the
overnight hours. The 00Z Corpus Christi sounding sampled ample
low-level moisture supporting sufficient buoyancy, amid moderate
deep shear, for a few strong storms. A few rotating convective
elements along the front may ingest surface-based effective inflow,
yielding an isolated risk for all severe hazards across the coastal
plain. An isolated, marginally severe hail risk could extend
slightly north of the surface front, where sufficient elevated
buoyancy/shear will exist. A Mesoscale Discussion addressing this
activity is forthcoming.