Rough outlook for East TX into LA Saturday for severe weather.
...MAXIMUM RISK BY HAZARD...
Tornado: 15% SIG - Moderate
Wind: 45% - Enhanced
Hail: 15% - Slight
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Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1227 PM CDT Fri Apr 12 2019
Valid 131200Z - 141200Z
...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS FOR NORTHERN
LOUISIANA...SOUTHERN ARKANSAS...AND SMALL PORTIONS OF WESTERN
MISSISSIPPI AND EAST TEXAS...
...SUMMARY...
Numerous severe thunderstorms capable primarily of damaging winds
and tornadoes, are expected across portions of east Texas,
Louisiana, southern Arkansas, Mississippi and surrounding areas
Saturday and Saturday night.
...Synopsis...
A vigorous mid-level trough initially over the Southern Rockies will
pivot eastward through the southern Great Plains and into the
western part of the Ozark Plateau by Sunday morning. A surface low
over the TX Hill Country will develop northeastward and deepen and
reach the vicinity of the confluence of the Ohio and Mississippi
Rivers. Trailing from this low, a cold front will sweep across east
Texas to near the Sabine River by sunset, and then continue eastward
across the lower Mississippi River into Mississippi and eventually
western Alabama.
...East-central TX eastward into western AL...
Southerly low-level flow will transport an increasingly moisture
rich airmass northward into the Arklatex and lower MS Valley during
the day. It is likely showers and thunderstorms, some potentially
capable of severe gusts and large hail, will be ongoing across
central TX into northeast TX prior to midday. Surface heating
within the destabilizing warm sector will lead to moderate buoyancy
(MLCAPE 1000-2000 J/kg) over the Sabine Valley and LA by early to
mid afternoon. Strong flow veering/increasing with height from
southeasterly to south-southwesterly, and reaching 60 to 70 kt at
mid levels, will support well-organized rotating updrafts with the
stronger storms. Convection will continue spreading eastward
through the evening and into the overnight hours.
Some lingering questions about the tornado risk remain due in part
to some conditional factors yet to occur. However, it appears the
tornado risk may maximize in 2 corridors. First, a diurnally
focused tornado risk (primarily supercellular) across northern LA
into far southern AR vicinity between 3-9pm. A second area of
potential concern may focus from northeast LA near the MS River
east-northeast across central and into parts of northeast/east MS
during the evening into the overnight. A mix mode of supercell/QLCS
or hybridization of the two within a convective line are possible.
Along with damaging gusts, strong tornadoes may also occur with a
few of the most intense storms. While the pre-frontal, cellular
convection should diminish overnight, a semi-organized band of
storms -- with embedded rotating updrafts and continued
severe/tornado potential -- will move across the central Gulf Coast
states through the end of the period.
...North Carolina/southeast Virginia and vicinity...
Models forecast that the eastern fringe of a warm front associated
with the developing south-central U.S. storm system will lie across
the Carolinas/Virginia vicinity during the day. With some heating
of a moist low-level airmass yielding around 1000 J/kg mixed-layer
CAPE during the afternoon, scattered/diurnally driven thunderstorms
are expected. While not excessive, shear -- aided by 35 kt
mid-level west-southwesterlies -- will be sufficient for storm
organization, and thus risk that a couple of storms reach severe
levels. Hail and gusty/locally damaging winds would be the primary
severe risk, before storms weaken into the evening hours.
...MAXIMUM RISK BY HAZARD...
Tornado: 15% SIG - Moderate
Wind: 45% - Enhanced
Hail: 15% - Slight
..Smith.. 04/12/2019
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