- Day Three
acus02 kwns 201728
Storm Prediction Center ac 201727
Day 2 convective outlook
National Weather Service Storm Prediction Center Norman OK
1227 PM CDT Fri Apr 20 2018
Valid 211200z - 221200z
..there is a marginal risk of severe thunderstorms from central Texas
to southwestern la...
Scattered strong/severe thunderstorms are possible across portions
of Texas into western Louisiana Saturday.
..central Texas into western la...
A mid- to upper-level low and associated trough will move southeast
from the central and southern High Plains to The Ark-la-tex region
by daybreak Sunday. An Arctic front over the southern High Plains
will overtake a Pacific cold front during the day across
north-central Texas and the consolidated boundary will progress
southeast to western la and the shelf waters of the Upper Texas coast.
Widespread clouds and rain are forecast through the early part of
the day to the north of I-20 in north-central and northeast Texas.
There is considerable uncertainty to the degree of destabilization
that may occur in wake of early-day rain. Some model guidance shows
very little destabilization whereas the 12z run of the GFS is by far
the most aggressive in destabilizing the boundary layer across
north-central Texas. With those instability concerns mentioned, it
appears the north extent of 60-65 dewpoints will advect into
east-central Texas by afternoon and only weak instability will develop.
A couple of stronger storms are possible with an isolated hail/wind
risk. This activity will grow upscale along the front and push into
east and southeast Texas after dark. A lingering threat for a damaging
gust may remain into parts of southeast Texas and southwest la
overnight Saturday night.