A mess...
000
FXUS64 KFWD 131906
AFDFWD
Area Forecast Discussion
National Weather Service Fort Worth TX
206 PM CDT Thu May 13 2021
...New Long Term...
Confidence is increasing regarding the potential for a prolonged
active weather period consisting of widespread significant
rainfall/flooding and some strong/severe thunderstorms. Enjoy
these couple days of sun and dry weather because it appears those
days will be scarce during the extended forecast period.
By Saturday, a relatively
zonal flow regime should be in place
across most of the US with warm/moist southerly
flow present
across the Southern Plains. Warm
advection may begin contributing
to
isolated/
scattered convective development by Saturday
afternoon across the western portion of the
CWA where a weak
cap
is expected to erode via
diabatic heating. With modest
shear and
the lack of a boundary to focus convective development, it`s
unlikely that these storms would be able to become organized or
reach strong/severe limits. The greater potential for deep
convection will reside far west of the forecast area in West Texas
along an
active dryline.
Our main forecast problem for the
weekend will be determining whether this convection could
organize into one or more MCSs and move into the forecast area
later Saturday night or Sunday morning. Have generally indicated
this type of solution with the current PoP configuration, and it
appears that the 30-40 kts of low-level flow and resultant
moisture flux could maintain convective clusters as they advance
eastward, despite generally decreasing MUCAPE and modest large-
scale ascent. Sunday`s forecast will largely hinge on these
events (or lack thereof), and a morning MCS may result in an
inactive remainder of the day if sufficient convective overturning
occurs. Alternatively, no overnight/morning convection would open
the door for some dryline activity to make it into our CWA later
in the day. It`s also possible activity north of us along a
stalled frontal zone in Oklahoma could make a southward push with
an expanding cold pool or effective frontal zone.